move potlatch presets to only be generated once, and allow pulling in way_tags in...

[rails.git] / app / controllers / amf_controller.rb

diff --git a/app/controllers/amf_controller.rb b/app/controllers/amf_controller.rb
index 9c8d4cc6a3d5607245a1d39523b86d091c387c81..4b92db11c3bdf92afa16829ceed70a26f506c153 100644 (file)
--- a/app/controllers/amf_controller.rb
+++ b/app/controllers/amf_controller.rb
@@ -4,8 +4,22 @@ class AmfController < ApplicationController
   session :off
   before_filter :check_write_availability
 
   session :off
   before_filter :check_write_availability
 

+  # AMF controller for Potlatch
+  # ---------------------------
+  # All interaction between Potlatch (as a .SWF application) and the 
+  # OSM database takes place using this controller. Messages are 
+  # encoded in the Actionscript Message Format (AMF).
+  #
+  # Public domain. Set your tab width to 4 to read this document. :)
+  # editions Systeme D / Richard Fairhurst 2004-2008
+  #
+  # All in/out parameters are floats unless explicitly stated.
+  # 
+  # to trap errors (getway_old,putway,putpoi,deleteway only):
+  #   return(-1,"message")             <-- just puts up a dialogue
+  #   return(-2,"message")             <-- also asks the user to e-mail me

   # to log:
   # to log:

-  # RAILS_DEFAULT_LOGGER.error("Args: #{args[0]}, #{args[1]}, #{args[2]}, #{args[3]}")
+  #   RAILS_DEFAULT_LOGGER.error("Args: #{args[0]}, #{args[1]}, #{args[2]}, #{args[3]}")

 
   # ====================================================================
   # Main AMF handler
 
   # ====================================================================
   # Main AMF handler


@@ -14,9 +28,10 @@ class AmfController < ApplicationController
 
   def talk
     req=StringIO.new(request.raw_post+0.chr)   # Get POST data as request
 
   def talk
     req=StringIO.new(request.raw_post+0.chr)   # Get POST data as request

-                                                                                       # (cf http://www.ruby-forum.com/topic/122163)
+    # (cf http://www.ruby-forum.com/topic/122163)

     req.read(2)                                                                        # Skip version indicator and client ID
     results={}                                                                 # Results of each body
     req.read(2)                                                                        # Skip version indicator and client ID
     results={}                                                                 # Results of each body

+    renumberednodes={}                                                 # Shared across repeated putways

 
     # -------------
     # Parse request
 
     # -------------
     # Parse request


@@ -38,16 +53,18 @@ class AmfController < ApplicationController
       args=getvalue(req)                               #  | get response (probably an array)
 
       case message
       args=getvalue(req)                               #  | get response (probably an array)
 
       case message

-                 when 'getpresets';            results[index]=putdata(index,getpresets)
-                 when 'whichways';                     results[index]=putdata(index,whichways(args))
-                 when 'whichways_deleted';     results[index]=putdata(index,whichways_deleted(args))
-                 when 'getway';                        results[index]=putdata(index,getway(args))
-                 when 'getway_old';            results[index]=putdata(index,getway_old(args))
-                 when 'getway_history';        results[index]=putdata(index,getway_history(args))
-                 when 'putway';                        results[index]=putdata(index,putway(args))
-                 when 'deleteway';                     results[index]=putdata(index,deleteway(args))
-                 when 'putpoi';                        results[index]=putdata(index,putpoi(args))
-                 when 'getpoi';                        results[index]=putdata(index,getpoi(args))
+      when 'getpresets';               results[index]=putdata(index,getpresets)
+      when 'whichways';                        results[index]=putdata(index,whichways(args))
+      when 'whichways_deleted';        results[index]=putdata(index,whichways_deleted(args))
+      when 'getway';                   results[index]=putdata(index,getway(args))
+      when 'getway_old';               results[index]=putdata(index,getway_old(args))
+      when 'getway_history';   results[index]=putdata(index,getway_history(args))
+      when 'putway';                   r=putway(args,renumberednodes)
+                                                               renumberednodes=r[3]
+                                                               results[index]=putdata(index,r)
+      when 'deleteway';                        results[index]=putdata(index,deleteway(args))
+      when 'putpoi';                   results[index]=putdata(index,putpoi(args))
+      when 'getpoi';                   results[index]=putdata(index,getpoi(args))

       end
     end
 
       end
     end
 


@@ -56,163 +73,39 @@ class AmfController < ApplicationController
 
     RAILS_DEFAULT_LOGGER.info("  Response: start")
     a,b=results.length.divmod(256)
 
     RAILS_DEFAULT_LOGGER.info("  Response: start")
     a,b=results.length.divmod(256)

-       render :content_type => "application/x-amf", :text => proc { |response, output| 
-        output.write 0.chr+0.chr+0.chr+0.chr+a.chr+b.chr
-               results.each do |k,v|
-                 output.write(v)
-               end
-       }
+    render :content_type => "application/x-amf", :text => proc { |response, output| 
+      output.write 0.chr+0.chr+0.chr+0.chr+a.chr+b.chr
+      results.each do |k,v|
+        output.write(v)
+      end
+    }

     RAILS_DEFAULT_LOGGER.info("  Response: end")
 
   end
 
   private
 
     RAILS_DEFAULT_LOGGER.info("  Response: end")
 
   end
 
   private
 

+  # Return presets (default tags and crap) to potlatch
+  # Global is set up in config/environment.rb on startup, code is in lib/osm.rb
+  def getpresets
+    return POTLATCH_PRESETS
+  end
+

   # ====================================================================
   # Remote calls
 
   # ====================================================================
   # Remote calls
 

-  # ----- getpresets
-  #          return presets,presetmenus and presetnames arrays

 
 

-  def getpresets
-    presets={}
-    presetmenus={}; presetmenus['point']=[]; presetmenus['way']=[]; presetmenus['POI']=[]
-    presetnames={}; presetnames['point']={}; presetnames['way']={}; presetnames['POI']={}
-    presettype=''
-    presetcategory=''
-
-    RAILS_DEFAULT_LOGGER.info("  Message: getpresets")
-
-    #          File.open("config/potlatch/presets.txt") do |file|
-
-    # Temporary patch to get around filepath problem
-    # To remove this patch and make the code nice again:
-    # 1. uncomment above line
-    # 2. fix the path in the above line
-    # 3. delete this here document, and the following line (StringIO....)
-
-    txt=<<-EOF
-way/road
-motorway: highway=motorway,ref=(type road number)
-trunk road: highway=trunk,ref=(type road number),name=(type road name)
-primary road: highway=primary,ref=(type road number),name=(type road name)
-secondary road: highway=secondary,ref=(type road number),name=(type road name)
-tertiary road: highway=tertiary,ref=,name=(type road name)
-residential road: highway=residential,ref=,name=(type road name)
-unclassified road: highway=unclassified,ref=,name=(type road name)
-
-way/footway
-footpath: highway=footway,foot=yes
-bridleway: highway=bridleway,foot=yes
-byway: highway=unsurfaced,foot=yes
-permissive path: highway=footway,foot=permissive
-
-way/cycleway
-cycle lane: highway=cycleway,cycleway=lane,ncn_ref=
-cycle track: highway=cycleway,cycleway=track,ncn_ref=
-cycle lane (NCN): highway=cycleway,cycleway=lane,name=(type name here),ncn_ref=(type route number)
-cycle track (NCN): highway=cycleway,cycleway=track,name=(type name here),ncn_ref=(type route number)
-
-way/waterway
-canal: waterway=canal,name=(type name here)
-navigable river: waterway=river,boat=yes,name=(type name here)
-navigable drain: waterway=drain,boat=yes,name=(type name here)
-derelict canal: waterway=derelict_canal,name=(type name here)
-unnavigable river: waterway=river,boat=no,name=(type name here)
-unnavigable drain: waterway=drain,boat=no,name=(type name here)
-
-way/railway
-railway: railway=rail
-tramway: railway=tram
-light railway: railway=light_rail
-preserved railway: railway=preserved
-disused railway tracks: railway=disused
-course of old railway: railway=abandoned
-
-way/natural
-lake: natural=water,landuse=
-forest: landuse=forest,natural=
-
-point/road
-mini roundabout: highway=mini_roundabout
-traffic lights: highway=traffic_signals
-
-point/footway
-bridge: highway=bridge
-gate: highway=gate
-stile: highway=stile
-cattle grid: highway=cattle_grid
-
-point/cycleway
-gate: highway=gate
-
-point/waterway
-lock gate: waterway=lock_gate
-weir: waterway=weir
-aqueduct: waterway=aqueduct
-winding hole: waterway=turning_point
-mooring: waterway=mooring
-
-point/railway
-station: railway=station
-viaduct: railway=viaduct
-level crossing: railway=crossing
-
-point/natural
-peak: natural=peak
-
-POI/road
-car park: amenity=parking
-petrol station: amenity=fuel
-
-POI/cycleway
-bike park: amenity=bicycle_parking
-
-POI/place
-city: place=city,name=(type name here),is_in=(type region or county)
-town: place=town,name=(type name here),is_in=(type region or county)
-suburb: place=suburb,name=(type name here),is_in=(type region or county)
-village: place=village,name=(type name here),is_in=(type region or county)
-hamlet: place=hamlet,name=(type name here),is_in=(type region or county)
-
-POI/tourism
-attraction: tourism=attraction,amenity=,religion=,denomination=
-church: tourism=,amenity=place_of_worship,name=(type name here),religion=christian,denomination=(type denomination here)
-hotel: tourism=hotel,amenity=,religion=,denomination=
-other religious: tourism=,amenity=place_of_worship,name=(type name here),religion=(type religion),denomination=
-post box: amenity=post_box,tourism=,name=,religion=,denomination=
-post office: amenity=post_office,tourism=,name=,religion=,denomination=
-pub: tourism=,amenity=pub,name=(type name here),religion=,denomination=
-
-POI/natural
-peak: point=peak
-EOF
-
-    StringIO.open(txt) do |file|
-      file.each_line {|line|
-        t=line.chomp
-        if (t=~/(\w+)\/(\w+)/) then
-          presettype=$1
-          presetcategory=$2
-          presetmenus[presettype].push(presetcategory)
-          presetnames[presettype][presetcategory]=["(no preset)"]
-        elsif (t=~/^(.+):\s?(.+)$/) then
-          pre=$1; kv=$2
-          presetnames[presettype][presetcategory].push(pre)
-          presets[pre]={}
-          kv.split(',').each {|a|
-            if (a=~/^(.+)=(.*)$/) then presets[pre][$1]=$2 end
-          }
-        end
-      }
-    end
-    return [presets,presetmenus,presetnames]
-  end

 
 

-  # ----- whichways(left,bottom,right,top)
-  #              return array of ways in current bounding box
-  #              at present, instead of using correct (=more complex) SQL to find
-  #              corner-crossing ways, it simply enlarges the bounding box by +/- 0.01
+  # ----- whichways
+  
+  # Find all the way ids and nodes (including tags and projected lat/lng) which aren't part of those ways in an are
+  # 
+  # The argument is an array containing the following, in order:
+  # 0. minimum longitude
+  # 1. minimum latitude
+  # 2. maximum longitude
+  # 3. maximum latitude
+  # 4. baselong, 5. basey, 6. masterscale as above

 
   def whichways(args)
     xmin = args[0].to_f-0.01
 
   def whichways(args)
     xmin = args[0].to_f-0.01


@@ -225,30 +118,26 @@ EOF
 
     RAILS_DEFAULT_LOGGER.info("  Message: whichways, bbox=#{xmin},#{ymin},#{xmax},#{ymax}")
 
 
     RAILS_DEFAULT_LOGGER.info("  Message: whichways, bbox=#{xmin},#{ymin},#{xmax},#{ymax}")
 

-    waylist = ActiveRecord::Base.connection.select_all("SELECT DISTINCT current_way_nodes.id AS wayid"+
-       "  FROM current_way_nodes,current_nodes,current_ways "+
-       " WHERE current_nodes.id=current_way_nodes.node_id "+
-       "   AND current_nodes.visible=1 "+
-       "   AND current_ways.id=current_way_nodes.id "+
-       "   AND current_ways.visible=1 "+
-       "   AND "+OSM.sql_for_area(ymin, xmin, ymax, xmax, "current_nodes."))
-
-    ways = waylist.collect {|a| a['wayid'].to_i } # get an array of way IDs
+    # find the way ids in an area
+    nodes_in_area = Node.find_by_area(ymin, xmin, ymax, xmax,:conditions => "visible = 1", :include => :way_nodes)
+    waynodes_in_area = nodes_in_area.collect {|node| node.way_nodes }.flatten
+    ways = waynodes_in_area.collect {|way_node| way_node.id[0]}.uniq

 
 

-    pointlist = ActiveRecord::Base.connection.select_all("SELECT current_nodes.id,current_nodes.latitude*0.0000001 AS lat,current_nodes.longitude*0.0000001 AS lng,current_nodes.tags "+
-       "  FROM current_nodes "+
-       "  LEFT OUTER JOIN current_way_nodes cwn ON cwn.node_id=current_nodes.id "+
-       " WHERE "+OSM.sql_for_area(ymin, xmin, ymax, xmax, "current_nodes.")+
-       "   AND cwn.id IS NULL "+
-       "   AND current_nodes.visible=1")
+    # find the node ids in an area that aren't part of ways
+    node_ids_in_area = nodes_in_area.collect {|node| node.id}.uniq
+    node_ids_used_in_ways = waynodes_in_area.collect {|way_node| way_node.node_id}.uniq
+    node_ids_not_used_in_area = node_ids_in_area - node_ids_used_in_ways
+    nodes_not_used_in_area = Node.find(node_ids_not_used_in_area)
+    points = nodes_not_used_in_area.collect {|n| [n.id, n.lon_potlatch(baselong,masterscale), n.lat_potlatch(basey,masterscale), n.tags_as_hash] }

 
 

-    points = pointlist.collect {|a| [a['id'],long2coord(a['lng'].to_f,baselong,masterscale),lat2coord(a['lat'].to_f,basey,masterscale),tag2array(a['tags'])]   } # get a list of node ids and their tags
-
-    return [ways,points]
+    [ways,points]

   end
 
   end
 

-  # ----- whichways_deleted(left,bottom,right,top)
+  # ----- whichways_deleted

   #              return array of deleted ways in current bounding box
   #              return array of deleted ways in current bounding box

+  #              in:   as whichways
+  #              does: finds all deleted ways with a deleted node in bounding box
+  #              out:  [0] array of way ids

   
   def whichways_deleted(args)
     xmin = args[0].to_f-0.01
   
   def whichways_deleted(args)
     xmin = args[0].to_f-0.01


@@ -259,169 +148,195 @@ EOF
     basey       = args[5]
     masterscale = args[6]
 
     basey       = args[5]
     masterscale = args[6]
 

-    waylist = ActiveRecord::Base.connection.select_all("SELECT DISTINCT current_way_nodes.id AS wayid"+
-       "  FROM current_way_nodes,current_nodes,current_ways "+
-       " WHERE current_nodes.id=current_way_nodes.node_id "+
-       "   AND current_ways.id=current_way_nodes.id "+
-       "   AND current_ways.visible=0 "+
-       "   AND "+OSM.sql_for_area(ymin, xmin, ymax, xmax, "current_nodes."))

 
 

-    ways = waylist.collect {|a| a['wayid'].to_i } # get an array of way IDs
-       [ways]
+
+    sql=<<-EOF
+     SELECT DISTINCT current_ways.id 
+       FROM current_nodes,way_nodes,current_ways 
+      WHERE #{OSM.sql_for_area(ymin, xmin, ymax, xmax, "current_nodes.")} 
+      AND way_nodes.node_id=current_nodes.id 
+      AND way_nodes.id=current_ways.id 
+      AND current_nodes.visible=0 
+      AND current_ways.visible=0 
+  EOF
+    waylist = ActiveRecord::Base.connection.select_all(sql)
+    ways = waylist.collect {|a| a['id'].to_i }
+    [ways]

   end
   end

-  
-  # ----- getway (objectname, way, baselong, basey, masterscale)
-  #              returns objectname, array of co-ordinates, attributes,
-  #                              xmin,xmax,ymin,ymax
+
+
+  # ----- getway
+
+  # Get a way with all of it's nodes and tags
+  # The input is an array with the following components, in order:
+  # 0. wayid - the ID of the way to get
+  # 1. baselong - origin of SWF map (longitude)
+  # 2. basey - origin of SWF map (latitude)
+  # 3. masterscale - SWF map scale
+  #
+  # The output is an array which contains all the nodes (with projected 
+  # latitude and longitude) and tags for a way (and all the nodes tags). 
+  # It also has the way's unprojected (WGS84) bbox.
+  #
+  # FIXME: The server really shouldn't be figuring out a ways bounding box and doing projection for potlatch
+  # FIXME: the argument splitting should be done in the 'talk' method, not here

 
   def getway(args)
 
   def getway(args)

-    objname,wayid,baselong,basey,masterscale=args
+    wayid,baselong,basey,masterscale = args

     wayid = wayid.to_i
     wayid = wayid.to_i

-    points = []
-    xmin = ymin =  999999
-    xmax = ymax = -999999

 
     RAILS_DEFAULT_LOGGER.info("  Message: getway, id=#{wayid}")
 
 
     RAILS_DEFAULT_LOGGER.info("  Message: getway, id=#{wayid}")
 

-    readwayquery(wayid).each {|row|
-      points<<[long2coord(row['longitude'].to_f,baselong,masterscale),lat2coord(row['latitude'].to_f,basey,masterscale),row['id'].to_i,nil,tag2array(row['tags'])]
-      xmin = [xmin,row['longitude'].to_f].min
-      xmax = [xmax,row['longitude'].to_f].max
-      ymin = [ymin,row['latitude'].to_f].min
-      ymax = [ymax,row['latitude'].to_f].max
-    }
+    way = Way.find_eager(wayid)
+    long_array = []
+    lat_array = []
+    points = []

 
 

-    attributes={}
-    attrlist=ActiveRecord::Base.connection.select_all "SELECT k,v FROM current_way_tags WHERE id=#{wayid}"
-    attrlist.each {|a| attributes[a['k'].gsub(':','|')]=a['v'] }
+    way.way_nodes.each do |way_node|
+      node = way_node.node # get the node record
+      projected_longitude = node.lon_potlatch(baselong,masterscale) # do projection for potlatch
+      projected_latitude = node.lat_potlatch(basey,masterscale)
+      id = node.id
+      tags_hash = node.tags_as_hash
+      
+      points << [projected_longitude, projected_latitude, id, nil, tags_hash]
+      long_array << projected_longitude
+      lat_array << projected_latitude
+    end

 
 

-    [objname,points,attributes,xmin,xmax,ymin,ymax]
+    [wayid,points,way.tags,long_array.min,long_array.max,lat_array.min,lat_array.max]

   end
   end

-  
-  # -----      getway_old (objectname, way, version, baselong, basey, masterscale)
-  #                    returns old version of way

 
 

-  # Node handling on undelete (historic=false):
-  # - always use the node specified, even if it's moved
-  
-  # Node handling on revert (historic=true):
-  # - if it's a visible node, use a new node id (i.e. not mucking up the old one)
-  #   which means the SWF needs to allocate new ids
-  # - if it's an invisible node, we can reuse the old node id
+  # ----- getway_old
+  #              returns old version of way
+
+  #              in:   [0] way id,
+  #                            [1] way version to get (or -1 for "last deleted version")
+  #                            [2] baselong, [3] basey, [4] masterscale
+  #              does: gets old version of way and all constituent nodes
+  #                            for undelete, always uses the most recent version of each node
+  #                              (even if it's moved)
+  #                            for revert, uses the historic version of each node, but if that node is
+  #                              still visible and has been changed since, generates a new node id
+  #              out:  [0] 0 (code for success), [1] SWF object name,
+  #                            [2] array of points (as getway _except_ [3] is node.visible?, 0 or 1),
+  #                            [4] xmin, [5] xmax, [6] ymin, [7] ymax (unprojected bbox),
+  #                            [8] way version

 
   def getway_old(args)
 
   def getway_old(args)

-    objname,wayid,version,baselong,basey,masterscale=args
+    RAILS_DEFAULT_LOGGER.info("  Message: getway_old (server is #{SERVER_URL})")
+    #  if SERVER_URL=="www.openstreetmap.org" then return -1,"Revert is not currently enabled on the OpenStreetMap server." end
+
+    wayid,version,baselong,basey,masterscale=args

     wayid = wayid.to_i
     wayid = wayid.to_i

+    version = version.to_i

     xmin = ymin =  999999
     xmax = ymax = -999999
     xmin = ymin =  999999
     xmax = ymax = -999999

-       dellist=[]
-
-       # get version (if -1) and timestamp
-       if version<0
-         historic=false
-         row=ActiveRecord::Base.connection.select_one("SELECT version FROM ways WHERE way=#{wayid} ORDER BY version DESC LIMIT 1")
-         version=row['version']
-       else
-         historic=true
-       end
-       row=ActiveRecord::Base.connection.select_one("SELECT timestamp FROM ways WHERE version=#{version} AND way=#{wayid}")
-       timestamp=row['timestamp']
-
-       # get node list from this version
-       sql=<<-EOF
-       SELECT cn.id,visible,latitude*0.0000001 AS latitude,longitude*0.0000001 AS longitude,tags 
-         FROM way_nodes wn,current_nodes cn 
-        WHERE wn.version=#{version} 
-          AND wn.id=#{wayid} 
-          AND wn.node_id=cn.id 
-        ORDER BY sequence_id
-       EOF
-       ActiveRecord::Base.connection.select_all(sql).each {|row|
-      points<<[long2coord(row['longitude'].to_f,baselong,masterscale),lat2coord(row['latitude'].to_f,basey,masterscale),row['id'].to_i,row['visible'].to_i,tag2array(row['tags'])]
+    points=[]
+    if version<0
+      historic=false
+      version=getlastversion(wayid,version)
+    else
+      historic=true
+    end
+    readwayquery_old(wayid,version,historic).each { |row|
+      points<<[long2coord(row['longitude'].to_f,baselong,masterscale),lat2coord(row['latitude'].to_f,basey,masterscale),row['id'].to_i,row['visible'].to_i,tag2array(row['tags'].to_s)]

       xmin=[xmin,row['longitude'].to_f].min
       xmax=[xmax,row['longitude'].to_f].max
       xmin=[xmin,row['longitude'].to_f].min
       xmax=[xmax,row['longitude'].to_f].max

-      ymin=[ymin,row['latitude'].to_f].min
-      ymax=[ymax,row['latitude'].to_f].max
-       }
-
-       # if historic (full revert), get the old version of each node
-       if historic then
-         for i in (0..points.length-1)
-               sql=<<-EOF
-               SELECT latitude*0.0000001 AS latitude,longitude*0.0000001 AS longitude,tags 
-                 FROM nodes 
-                WHERE id=#{points[i][2]} 
-                  AND timestamp<=#{waytime} 
-                ORDER BY timestamp DESC 
-                LIMIT 1
-               EOF
-               row=ActiveRecord::Base.connection.select_one(sql)
-               unless row.empty? then
-                 points[i][0]=long2coord(row['longitude'].to_f,baselong,masterscale)
-                 points[i][1]=lat2coord(row['latitude'].to_f,baselong,masterscale)
-                 points[i][4]=tag2array(row['tags'])
-               end
-         end
-       end
-
-       # get tags from this version
+      ymin=[ymin,row['latitude' ].to_f].min
+      ymax=[ymax,row['latitude' ].to_f].max
+    }
+
+    # get tags from this version

     attributes={}
     attributes={}

-    attrlist=ActiveRecord::Base.connection.select_all "SELECT k,v FROM current_way_tags WHERE id=#{wayid} AND version=#{version}"
+    attrlist=ActiveRecord::Base.connection.select_all "SELECT k,v FROM way_tags WHERE id=#{wayid} AND version=#{version}"

     attrlist.each {|a| attributes[a['k'].gsub(':','|')]=a['v'] }
     attrlist.each {|a| attributes[a['k'].gsub(':','|')]=a['v'] }

+    attributes['history']="Retrieved from v"+version.to_s
+
+    [0,wayid,points,attributes,xmin,xmax,ymin,ymax,version]
+  end

 
 

-    [objname,points,attributes,xmin,xmax,ymin,ymax]
-  end
-
-  # -----      getway_history (way)
-  #                    returns array of previous versions (version,timestamp,visible,user)
-  #                    should also show 'created_by'
-
-  def getway_history(wayid)
-    RAILS_DEFAULT_LOGGER.info("  Received history request for #{wayid}")
-       history=[]
-       sql=<<-EOF
-       SELECT version,timestamp,visible,display_name,data_public
-         FROM ways,users
-        WHERE ways.id=#{wayid}
-          AND ways.user_id=users.id
-        ORDER BY version DESC
-       EOF
-       histlist=ActiveRecord::Base.connection.select_all(sql)
-       histlist.each { |row|
-               if row['data_public'] then user=row['display_name'] else user='anonymous' end
-               history<<[row['version'],row['timestamp'],row['visible'],user]
-       }
-       [history]
-  end
-
-  # -----      putway (user token, way, array of co-ordinates, array of attributes,
-  #                                    baselong, basey, masterscale)
-  #                    returns current way ID, new way ID, hash of renumbered nodes,
-  #                                    xmin,xmax,ymin,ymax
-
-  def putway(args)
+  # ----- getway_history
+  #              find history of a way
+
+  #              in:   [0] way id
+  #              does: finds history of a way
+  #              out:  [0] array of previous versions (where each is
+  #                                    [0] version, [1] db timestamp (string),
+  #                                    [2] visible 0 or 1,
+  #                                    [3] username or 'anonymous' (string))
+
+  def getway_history(args)
+    wayid=args[0]
+    history=[]
+    sql=<<-EOF
+  SELECT version,timestamp,visible,display_name,data_public
+    FROM ways,users
+   WHERE ways.id=#{wayid}
+     AND ways.user_id=users.id
+     AND ways.visible=1
+   ORDER BY version DESC
+  EOF
+    histlist=ActiveRecord::Base.connection.select_all(sql)
+    histlist.each { |row|
+      if row['data_public'].to_i==1 then user=row['display_name'] else user='anonymous' end
+      history<<[row['version'],row['timestamp'],row['visible'],user]
+    }
+    [history]
+  end
+
+  # ----- putway
+  #              saves a way to the database
+
+  #              in:   [0] user token (string),
+  #                            [1] original way id (may be negative), 
+  #                            [2] array of points (as getway/getway_old),
+  #                            [3] hash of way tags,
+  #                            [4] original way version (0 if not a reverted/undeleted way),
+  #                            [5] baselong, [6] basey, [7] masterscale
+  #              does: saves way to the database
+  #                            all constituent nodes are created/updated as necessary
+  #                            (or deleted if they were in the old version and are otherwise unused)
+  #              out:  [0] 0 (code for success), [1] original way id (unchanged),
+  #                            [2] new way id, [3] hash of renumbered nodes (old id=>new id),
+  #                            [4] xmin, [5] xmax, [6] ymin, [7] ymax (unprojected bbox)
+
+  def putway(args,renumberednodes)

     RAILS_DEFAULT_LOGGER.info("  putway started")
     RAILS_DEFAULT_LOGGER.info("  putway started")

-    usertoken,originalway,points,attributes,baselong,basey,masterscale=args
+    usertoken,originalway,points,attributes,oldversion,baselong,basey,masterscale=args

     uid=getuserid(usertoken)
     uid=getuserid(usertoken)

-    return if !uid
+    if !uid then return -1,"You are not logged in, so the way could not be saved." end
+

     RAILS_DEFAULT_LOGGER.info("  putway authenticated happily")
     RAILS_DEFAULT_LOGGER.info("  putway authenticated happily")

-    db_uqn='unin'+uid.to_s+originalway.to_i.abs.to_s+Time.new.to_i.to_s        # temp uniquenodes table name, typically 51 chars
-    db_now='@now'+uid.to_s+originalway.to_i.abs.to_s+Time.new.to_i.to_s        # 'now' variable name, typically 51 chars
+    db_uqn='unin'+(rand*100).to_i.to_s+uid.to_s+originalway.to_i.abs.to_s+Time.new.to_i.to_s   # temp uniquenodes table name, typically 51 chars
+    db_now='@now'+(rand*100).to_i.to_s+uid.to_s+originalway.to_i.abs.to_s+Time.new.to_i.to_s   # 'now' variable name, typically 51 chars

     ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
     originalway=originalway.to_i
     ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
     originalway=originalway.to_i

+    oldversion=oldversion.to_i

 
     RAILS_DEFAULT_LOGGER.info("  Message: putway, id=#{originalway}")
 
 
     RAILS_DEFAULT_LOGGER.info("  Message: putway, id=#{originalway}")
 

+    # -- Temporary check for null IDs
+
+    points.each do |a|
+      if a[2]==0 or a[2].nil? then return -2,"Server error - node with id 0 found in way #{originalway}." end
+    end
+

     # -- 3.    read original way into memory
 
     # -- 3.    read original way into memory
 

-    xc={}; yc={}; tagc={}
+    xc={}; yc={}; tagc={}; vc={}

     if originalway>0
       way=originalway
     if originalway>0
       way=originalway

-      readwayquery(way).each { |row|
+      if oldversion==0 then r=readwayquery(way,false)
+      else r=readwayquery_old(way,oldversion,true) end
+      r.each { |row|

         id=row['id'].to_i
         id=row['id'].to_i

-        xc[id]=row['longitude'].to_f
-        yc[id]=row['latitude' ].to_f
-        tagc[id]=row['tags']
+        if (id>0) then
+          xc[id]=row['longitude'].to_f
+          yc[id]=row['latitude' ].to_f
+          tagc[id]=row['tags']
+          vc[id]=row['visible'].to_i
+        end

       }
       ActiveRecord::Base.connection.update("UPDATE current_ways SET timestamp=#{db_now},user_id=#{uid},visible=1 WHERE id=#{way}")
     else
       }
       ActiveRecord::Base.connection.update("UPDATE current_ways SET timestamp=#{db_now},user_id=#{uid},visible=1 WHERE id=#{way}")
     else


@@ -437,8 +352,7 @@ EOF
     xmin=ymin= 999999
     xmax=ymax=-999999
     insertsql=''
     xmin=ymin= 999999
     xmax=ymax=-999999
     insertsql=''

-    renumberednodes={}
-       nodelist=[]
+    nodelist=[]

 
     points.each_index do |i|
       xs=coord2long(points[i][0],masterscale,baselong)
 
     points.each_index do |i|
       xs=coord2long(points[i][0],masterscale,baselong)


@@ -446,7 +360,7 @@ EOF
       xmin=[xs,xmin].min; xmax=[xs,xmax].max
       ymin=[ys,ymin].min; ymax=[ys,ymax].max
       node=points[i][2].to_i
       xmin=[xs,xmin].min; xmax=[xs,xmax].max
       ymin=[ys,ymin].min; ymax=[ys,ymax].max
       node=points[i][2].to_i

-         tagstr=array2tag(points[i][4])
+      tagstr=array2tag(points[i][4])

       tagsql="'"+sqlescape(tagstr)+"'"
       lat=(ys * 10000000).round
       long=(xs * 10000000).round
       tagsql="'"+sqlescape(tagstr)+"'"
       lat=(ys * 10000000).round
       long=(xs * 10000000).round


@@ -455,20 +369,20 @@ EOF
       # compare node
       if node<0
         # new node - create
       # compare node
       if node<0
         # new node - create

-               if renumberednodes[node.to_s].nil?
+        if renumberednodes[node.to_s].nil?

           newnode=ActiveRecord::Base.connection.insert("INSERT INTO current_nodes (   latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (           #{lat},#{long},#{db_now},#{uid},1,#{tagsql},#{tile})")
           newnode=ActiveRecord::Base.connection.insert("INSERT INTO current_nodes (   latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (           #{lat},#{long},#{db_now},#{uid},1,#{tagsql},#{tile})")

-                  ActiveRecord::Base.connection.insert("INSERT INTO nodes         (id,latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{newnode},#{lat},#{long},#{db_now},#{uid},1,#{tagsql},#{tile})")
+          ActiveRecord::Base.connection.insert("INSERT INTO nodes         (id,latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{newnode},#{lat},#{long},#{db_now},#{uid},1,#{tagsql},#{tile})")

           points[i][2]=newnode
           nodelist.push(newnode)
           renumberednodes[node.to_s]=newnode.to_s
           points[i][2]=newnode
           nodelist.push(newnode)
           renumberednodes[node.to_s]=newnode.to_s

-               else
+        else

           points[i][2]=renumberednodes[node.to_s].to_i
           points[i][2]=renumberednodes[node.to_s].to_i

-               end
+        end

 
       elsif xc.has_key?(node)
 
       elsif xc.has_key?(node)

-               nodelist.push(node)
+        nodelist.push(node)

         # old node from original way - update
         # old node from original way - update

-        if (xs!=xc[node] or (ys/0.0000001).round!=(yc[node]/0.0000001).round or tagstr!=tagc[node])
+        if ((xs/0.0000001).round!=(xc[node]/0.0000001).round or (ys/0.0000001).round!=(yc[node]/0.0000001).round or tagstr!=tagc[node] or vc[node]==0)

           ActiveRecord::Base.connection.insert("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{node},#{lat},#{long},#{db_now},#{uid},1,#{tagsql},#{tile})")
           ActiveRecord::Base.connection.update("UPDATE current_nodes SET latitude=#{lat},longitude=#{long},timestamp=#{db_now},user_id=#{uid},tags=#{tagsql},visible=1,tile=#{tile} WHERE id=#{node}")
         end
           ActiveRecord::Base.connection.insert("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{node},#{lat},#{long},#{db_now},#{uid},1,#{tagsql},#{tile})")
           ActiveRecord::Base.connection.update("UPDATE current_nodes SET latitude=#{lat},longitude=#{long},timestamp=#{db_now},user_id=#{uid},tags=#{tagsql},visible=1,tile=#{tile} WHERE id=#{node}")
         end


@@ -478,15 +392,15 @@ EOF
     end
 
 
     end
 
 

-       # -- 6a. delete any nodes not in modified way
+    # -- 6a. delete any nodes not in modified way

 
     createuniquenodes(way,db_uqn,nodelist)     # nodes which appear in this way but no other
 
     sql=<<-EOF
 
     createuniquenodes(way,db_uqn,nodelist)     # nodes which appear in this way but no other
 
     sql=<<-EOF

-       INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tile)  
-       SELECT DISTINCT cn.id,cn.latitude,cn.longitude,#{db_now},#{uid},0,cn.tile
-         FROM current_nodes AS cn,#{db_uqn}
-        WHERE cn.id=node_id
+  INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tile)  
+  SELECT DISTINCT cn.id,cn.latitude,cn.longitude,#{db_now},#{uid},0,cn.tile
+    FROM current_nodes AS cn,#{db_uqn}
+   WHERE cn.id=node_id

     EOF
     ActiveRecord::Base.connection.insert(sql)
 
     EOF
     ActiveRecord::Base.connection.insert(sql)
 


@@ -497,10 +411,10 @@ EOF
     EOF
     ActiveRecord::Base.connection.update(sql)
 
     EOF
     ActiveRecord::Base.connection.update(sql)
 

-       deleteuniquenoderelations(db_uqn,uid,db_now)
-    ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqn}")
+    deleteuniquenoderelations(db_uqn,uid,db_now)
+    ActiveRecord::Base.connection.execute("DROP TEMPORARY TABLE #{db_uqn}")

 
 

-       #       6b. insert new version of route into way_nodes
+    #  6b. insert new version of route into way_nodes

 
     insertsql =''
     currentsql=''
 
     insertsql =''
     currentsql=''


@@ -534,29 +448,38 @@ EOF
     if (insertsql !='') then ActiveRecord::Base.connection.insert("INSERT INTO way_tags (id,k,v,version) VALUES #{insertsql}" ) end
     if (currentsql!='') then ActiveRecord::Base.connection.insert("INSERT INTO current_way_tags (id,k,v) VALUES #{currentsql}") end
 
     if (insertsql !='') then ActiveRecord::Base.connection.insert("INSERT INTO way_tags (id,k,v,version) VALUES #{insertsql}" ) end
     if (currentsql!='') then ActiveRecord::Base.connection.insert("INSERT INTO current_way_tags (id,k,v) VALUES #{currentsql}") end
 

-    [originalway,way,renumberednodes,xmin,xmax,ymin,ymax]
+    [0,originalway,way,renumberednodes,xmin,xmax,ymin,ymax]

   end
 
   end
 

-  # -----      putpoi (user token, id, x,y,tag array,visible,baselong,basey,masterscale)
-  #                    returns current id, new id
-  #                    if new: add new row to current_nodes and nodes
-  #                    if old: add new row to nodes, update current_nodes
+  # ----- putpoi
+  #              save POI to the database
+
+  #              in:   [0] user token (string),
+  #                            [1] original node id (may be negative),
+  #                            [2] projected longitude, [3] projected latitude,
+  #                            [4] hash of tags, [5] visible (0 to delete, 1 otherwise), 
+  #                            [6] baselong, [7] basey, [8] masterscale
+  #              does: saves POI node to the database
+  #                            refuses save if the node has since become part of a way
+  #              out:  [0] 0 (success), [1] original node id (unchanged),
+  #                            [2] new node id

 
   def putpoi(args)
     usertoken,id,x,y,tags,visible,baselong,basey,masterscale=args
     uid=getuserid(usertoken)
 
   def putpoi(args)
     usertoken,id,x,y,tags,visible,baselong,basey,masterscale=args
     uid=getuserid(usertoken)

-    return if !uid
-    db_now='@now'+uid.to_s+id.to_i.abs.to_s+Time.new.to_i.to_s # 'now' variable name, typically 51 chars
+    if !uid then return -1,"You are not logged in, so the point could not be saved." end
+
+    db_now='@now'+(rand*100).to_i.to_s+uid.to_s+id.to_i.abs.to_s+Time.new.to_i.to_s    # 'now' variable name, typically 51 chars

     ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
 
     id=id.to_i
     visible=visible.to_i
     ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
 
     id=id.to_i
     visible=visible.to_i

-       if visible==0 then
-               # if deleting, check node hasn't become part of a way 
-               inway=ActiveRecord::Base.connection.select_one("SELECT cw.id FROM current_ways cw,current_way_nodes cwn WHERE cw.id=cwn.id AND cw.visible=1 AND cwn.node_id=#{id} LIMIT 1")
-               unless inway.nil? then return [id,id] end       # should really return an error
-               deleteitemrelations(id,'node',uid,db_now)
-       end
+    if visible==0 then
+      # if deleting, check node hasn't become part of a way 
+      inway=ActiveRecord::Base.connection.select_one("SELECT cw.id FROM current_ways cw,current_way_nodes cwn WHERE cw.id=cwn.id AND cw.visible=1 AND cwn.node_id=#{id} LIMIT 1")
+      unless inway.nil? then return -1,"The point has since become part of a way, so you cannot save it as a POI." end
+      deleteitemrelations(id,'node',uid,db_now)
+    end

 
     x=coord2long(x.to_f,masterscale,baselong)
     y=coord2lat(y.to_f,masterscale,basey)
 
     x=coord2long(x.to_f,masterscale,baselong)
     y=coord2lat(y.to_f,masterscale,basey)


@@ -564,60 +487,71 @@ EOF
     lat=(y * 10000000).round
     long=(x * 10000000).round
     tile=QuadTile.tile_for_point(y, x)
     lat=(y * 10000000).round
     long=(x * 10000000).round
     tile=QuadTile.tile_for_point(y, x)

-       
+

     if (id>0) then
     if (id>0) then

-        ActiveRecord::Base.connection.insert("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{id},#{lat},#{long},#{db_now},#{uid},#{visible},#{tagsql},#{tile})");
-        ActiveRecord::Base.connection.update("UPDATE current_nodes SET latitude=#{lat},longitude=#{long},timestamp=#{db_now},user_id=#{uid},visible=#{visible},tags=#{tagsql},tile=#{tile} WHERE id=#{id}");
-        newid=id
+      ActiveRecord::Base.connection.insert("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{id},#{lat},#{long},#{db_now},#{uid},#{visible},#{tagsql},#{tile})");
+      ActiveRecord::Base.connection.update("UPDATE current_nodes SET latitude=#{lat},longitude=#{long},timestamp=#{db_now},user_id=#{uid},visible=#{visible},tags=#{tagsql},tile=#{tile} WHERE id=#{id}");
+      newid=id

     else
     else

-        newid=ActiveRecord::Base.connection.insert("INSERT INTO current_nodes (latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{lat},#{long},#{db_now},#{uid},#{visible},#{tagsql},#{tile})");
-              ActiveRecord::Base.connection.update("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{newid},#{lat},#{long},#{db_now},#{uid},#{visible},#{tagsql},#{tile})");
+      newid=ActiveRecord::Base.connection.insert("INSERT INTO current_nodes (latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{lat},#{long},#{db_now},#{uid},#{visible},#{tagsql},#{tile})");
+      ActiveRecord::Base.connection.update("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{newid},#{lat},#{long},#{db_now},#{uid},#{visible},#{tagsql},#{tile})");

     end
     end

-    [id,newid]
+    [0,id,newid]

   end
 
   end
 

-  # -----      getpoi (id,baselong,basey,masterscale)
-  #                    returns id,x,y,tag array
-  
+  # ----- getpoi
+  #              read POI from database
+  #              (only called on revert: POIs are usually read by whichways)
+
+  #              in:   [0] node id, [1] baselong, [2] basey, [3] masterscale
+  #              does: reads POI
+  #              out:  [0] id (unchanged), [1] projected long, [2] projected lat,
+  #                            [3] hash of tags
+

   def getpoi(args)
   def getpoi(args)

-       id,baselong,basey,masterscale=args; id=id.to_i
-       poi=ActiveRecord::Base.connection.select_one("SELECT latitude*0.0000001 AS lat,longitude*0.0000001 AS lng,tags "+
-               "FROM current_nodes WHERE visible=1 AND id=#{id}")
-       if poi.nil? then return [nil,nil,nil,''] end
-       [id,
-        long2coord(poi['lng'].to_f,baselong,masterscale),
-        lat2coord(poi['lat'].to_f,basey,masterscale),
-        tag2array(poi['tags'])]
+    id,baselong,basey,masterscale=args; id=id.to_i
+    poi=ActiveRecord::Base.connection.select_one("SELECT latitude*0.0000001 AS lat,longitude*0.0000001 AS lng,tags "+
+    "FROM current_nodes WHERE visible=1 AND id=#{id}")
+    if poi.nil? then return [nil,nil,nil,''] end
+    [id,
+      long2coord(poi['lng'].to_f,baselong,masterscale),
+      lat2coord(poi['lat'].to_f,basey,masterscale),
+      tag2array(poi['tags'])]

   end
 
   end
 

-  # -----      deleteway (user token, way, nodes to keep)
-  #                    returns way ID only
+  # ----- deleteway
+  #              delete way and constituent nodes from database
+
+  #              in:   [0] user token (string), [1] way id
+  #              does: deletes way from db and any constituent nodes not used elsewhere
+  #                            also removes ways/nodes from any relations they're in
+  #              out:  [0] 0 (success), [1] way id (unchanged)

 
   def deleteway(args)
 
   def deleteway(args)

-    usertoken,way,preserve=args
+    usertoken,way=args

 
     RAILS_DEFAULT_LOGGER.info("  Message: deleteway, id=#{way}")
 
     RAILS_DEFAULT_LOGGER.info("  Message: deleteway, id=#{way}")

+    uid=getuserid(usertoken)
+    if !uid then return -1,"You are not logged in, so the way could not be deleted." end

 
 

-    uid=getuserid(usertoken); if !uid then return end

     way=way.to_i
     way=way.to_i

-
-    db_uqn='unin'+uid.to_s+way.to_i.abs.to_s+Time.new.to_i.to_s        # temp uniquenodes table name, typically 51 chars
-    db_now='@now'+uid.to_s+way.to_i.abs.to_s+Time.new.to_i.to_s        # 'now' variable name, typically 51 chars
+    db_uqn='unin'+(rand*100).to_i.to_s+uid.to_s+way.to_i.abs.to_s+Time.new.to_i.to_s   # temp uniquenodes table name, typically 51 chars
+    db_now='@now'+(rand*100).to_i.to_s+uid.to_s+way.to_i.abs.to_s+Time.new.to_i.to_s   # 'now' variable name, typically 51 chars

     ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
 
     # - delete any otherwise unused nodes
     ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
 
     # - delete any otherwise unused nodes

-  
+

     createuniquenodes(way,db_uqn,[])
 
     createuniquenodes(way,db_uqn,[])
 

-       unless (preserve.empty?) then
-               ActiveRecord::Base.connection.execute("DELETE FROM #{db_uqn} WHERE node_id IN ("+preserve.join(',')+")")
-       end
+    #  unless (preserve.empty?) then
+    #          ActiveRecord::Base.connection.execute("DELETE FROM #{db_uqn} WHERE node_id IN ("+preserve.join(',')+")")
+    #  end

 
     sql=<<-EOF
 
     sql=<<-EOF

-       INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tile)
-       SELECT DISTINCT cn.id,cn.latitude,cn.longitude,#{db_now},#{uid},0,cn.tile
-         FROM current_nodes AS cn,#{db_uqn}
-        WHERE cn.id=node_id
+  INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tile)
+  SELECT DISTINCT cn.id,cn.latitude,cn.longitude,#{db_now},#{uid},0,cn.tile
+    FROM current_nodes AS cn,#{db_uqn}
+   WHERE cn.id=node_id

     EOF
     ActiveRecord::Base.connection.insert(sql)
 
     EOF
     ActiveRecord::Base.connection.insert(sql)
 


@@ -628,295 +562,351 @@ EOF
     EOF
     ActiveRecord::Base.connection.update(sql)
 
     EOF
     ActiveRecord::Base.connection.update(sql)
 

-       deleteuniquenoderelations(db_uqn,uid,db_now)
-    ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqn}")
+    deleteuniquenoderelations(db_uqn,uid,db_now)
+    ActiveRecord::Base.connection.execute("DROP TEMPORARY TABLE #{db_uqn}")

 
     # - delete way
 
     # - delete way

-       
+

     ActiveRecord::Base.connection.insert("INSERT INTO ways (id,user_id,timestamp,visible) VALUES (#{way},#{uid},#{db_now},0)")
     ActiveRecord::Base.connection.update("UPDATE current_ways SET user_id=#{uid},timestamp=#{db_now},visible=0 WHERE id=#{way}")
     ActiveRecord::Base.connection.execute("DELETE FROM current_way_nodes WHERE id=#{way}")
     ActiveRecord::Base.connection.execute("DELETE FROM current_way_tags WHERE id=#{way}")
     ActiveRecord::Base.connection.insert("INSERT INTO ways (id,user_id,timestamp,visible) VALUES (#{way},#{uid},#{db_now},0)")
     ActiveRecord::Base.connection.update("UPDATE current_ways SET user_id=#{uid},timestamp=#{db_now},visible=0 WHERE id=#{way}")
     ActiveRecord::Base.connection.execute("DELETE FROM current_way_nodes WHERE id=#{way}")
     ActiveRecord::Base.connection.execute("DELETE FROM current_way_tags WHERE id=#{way}")

-       deleteitemrelations(way,'way',uid,db_now)
-    way
-end
+    deleteitemrelations(way,'way',uid,db_now)
+    [0,way]
+  end

 
 
 
 
 
 

-# ====================================================================
-# Support functions for remote calls
+  # ====================================================================
+  # Support functions for remote calls

 
 

-def readwayquery(id)
-  ActiveRecord::Base.connection.select_all "SELECT latitude*0.0000001 AS latitude,longitude*0.0000001 AS longitude,current_nodes.id,tags "+
-      "    FROM current_way_nodes,current_nodes "+
-      "   WHERE current_way_nodes.id=#{id} "+
-      "     AND current_way_nodes.node_id=current_nodes.id "+
-      "     AND current_nodes.visible=1 "+
-      "   ORDER BY sequence_id"
-end
+  def readwayquery(id,insistonvisible)
+    sql=<<-EOF
+    SELECT latitude*0.0000001 AS latitude,longitude*0.0000001 AS longitude,current_nodes.id,tags,visible 
+      FROM current_way_nodes,current_nodes 
+     WHERE current_way_nodes.id=#{id} 
+       AND current_way_nodes.node_id=current_nodes.id 
+  EOF
+    if insistonvisible then sql+=" AND current_nodes.visible=1 " end
+    sql+=" ORDER BY sequence_id"
+    ActiveRecord::Base.connection.select_all(sql)
+  end

 
 

-def createuniquenodes(way,uqn_name,nodelist)
-       # Find nodes which appear in this way but no others
-       sql=<<-EOF
-       CREATE TEMPORARY TABLE #{uqn_name}
-                                       SELECT a.node_id
-                                         FROM (SELECT DISTINCT node_id FROM current_way_nodes
-                                                       WHERE id=#{way}) a
-                                LEFT JOIN current_way_nodes b
-                                               ON b.node_id=a.node_id
-                                          AND b.id!=#{way}
-                                        WHERE b.node_id IS NULL
-       EOF
-       unless nodelist.empty? then
-         sql+="AND a.node_id NOT IN ("+nodelist.join(',')+")"
-       end
-       ActiveRecord::Base.connection.execute(sql)
-end
+  def getlastversion(id,version)
+    row=ActiveRecord::Base.connection.select_one("SELECT version FROM ways WHERE id=#{id} AND visible=1 ORDER BY version DESC LIMIT 1")
+    row['version']
+  end

 
 

+  def readwayquery_old(id,version,historic)
+    # Node handling on undelete (historic=false):
+    # - always use the node specified, even if it's moved

 
 

+    # Node handling on revert (historic=true):
+    # - if it's a visible node, use a new node id (i.e. not mucking up the old one)
+    #   which means the SWF needs to allocate new ids
+    # - if it's an invisible node, we can reuse the old node id

 
 

-# ====================================================================
-# Relations handling
-# deleteuniquenoderelations(uqn_name,uid,db_now)
-# deleteitemrelations(way|node,'way'|'node',uid,db_now)
+    # get node list from specified version of way,
+    # and the _current_ lat/long/tags of each node

 
 

-def deleteuniquenoderelations(uqn_name,uid,db_now)
-       sql=<<-EOF
-       SELECT node_id,cr.id FROM #{uqn_name},current_relation_members crm,current_relations cr 
-        WHERE crm.member_id=node_id 
-          AND crm.member_type='node' 
-          AND crm.id=cr.id 
-          AND cr.visible=1
-       EOF
+    row=ActiveRecord::Base.connection.select_one("SELECT timestamp FROM ways WHERE version=#{version} AND id=#{id}")
+    waytime=row['timestamp']

 
 

-       relnodes=ActiveRecord::Base.connection.select_all(sql)
-       relnodes.each do |a|
-               removefromrelation(a['node_id'],'node',a['id'],uid,db_now)
-       end
-end
+    sql=<<-EOF
+  SELECT cn.id,visible,latitude*0.0000001 AS latitude,longitude*0.0000001 AS longitude,tags 
+    FROM way_nodes wn,current_nodes cn 
+   WHERE wn.version=#{version} 
+     AND wn.id=#{id} 
+     AND wn.node_id=cn.id 
+   ORDER BY sequence_id
+  EOF
+    rows=ActiveRecord::Base.connection.select_all(sql)
+
+    # if historic (full revert), get the old version of each node
+    # - if it's in another way now, generate a new id
+    # - if it's not in another way, use the old ID
+    if historic then
+      rows.each_index do |i|
+        sql=<<-EOF
+    SELECT latitude*0.0000001 AS latitude,longitude*0.0000001 AS longitude,tags,cwn.id AS currentway 
+      FROM nodes n
+   LEFT JOIN current_way_nodes cwn
+      ON cwn.node_id=n.id
+     WHERE n.id=#{rows[i]['id']} 
+       AND n.timestamp<="#{waytime}" 
+     AND cwn.id!=#{id} 
+     ORDER BY n.timestamp DESC 
+     LIMIT 1
+    EOF
+        row=ActiveRecord::Base.connection.select_one(sql)
+        unless row.nil? then
+          nx=row['longitude'].to_f
+          ny=row['latitude'].to_f
+          if (row['currentway'] && (nx!=rows[i]['longitude'].to_f or ny!=rows[i]['latitude'].to_f or row['tags']!=rows[i]['tags'])) then rows[i]['id']=-1 end
+          rows[i]['longitude']=nx
+          rows[i]['latitude' ]=ny
+          rows[i]['tags'     ]=row['tags']
+        end
+      end
+    end
+    rows
+  end

 
 

-def deleteitemrelations(objid,type,uid,db_now)
-       sql=<<-EOF
-       SELECT cr.id FROM current_relation_members crm,current_relations cr 
-        WHERE crm.member_id=#{objid} 
-          AND crm.member_type='#{type}' 
-          AND crm.id=cr.id 
-          AND cr.visible=1
-       EOF
-       
-       relways=ActiveRecord::Base.connection.select_all(sql)
-       relways.each do |a|
-               removefromrelation(objid,type,a['id'],uid,db_now)
-       end
-end
+  def createuniquenodes(way,uqn_name,nodelist)
+    # Find nodes which appear in this way but no others
+    sql=<<-EOF
+  CREATE TEMPORARY TABLE #{uqn_name}
+          SELECT a.node_id
+            FROM (SELECT DISTINCT node_id FROM current_way_nodes
+              WHERE id=#{way}) a
+         LEFT JOIN current_way_nodes b
+            ON b.node_id=a.node_id
+             AND b.id!=#{way}
+           WHERE b.node_id IS NULL
+  EOF
+    unless nodelist.empty? then
+      sql+="AND a.node_id NOT IN ("+nodelist.join(',')+")"
+    end
+    ActiveRecord::Base.connection.execute(sql)
+  end

 
 

-def removefromrelation(objid,type,relation,uid,db_now)
-       rver=ActiveRecord::Base.connection.insert("INSERT INTO relations (id,user_id,timestamp,visible) VALUES (#{relation},#{uid},#{db_now},1)")
-
-       tagsql=<<-EOF
-       INSERT INTO relation_tags (id,k,v,version) 
-       SELECT id,k,v,#{rver} FROM current_relation_tags 
-        WHERE id=#{relation} 
-       EOF
-       ActiveRecord::Base.connection.insert(tagsql)
-
-       membersql=<<-EOF
-       INSERT INTO relation_members (id,member_type,member_id,member_role,version) 
-       SELECT id,member_type,member_id,member_role,#{rver} FROM current_relation_members 
-        WHERE id=#{relation} 
-          AND (member_id!=#{objid} OR member_type!='#{type}')
-       EOF
-       ActiveRecord::Base.connection.insert(membersql)
-       
-       ActiveRecord::Base.connection.update("UPDATE current_relations SET user_id=#{uid},timestamp=#{db_now} WHERE id=#{relation}")
-       ActiveRecord::Base.connection.execute("DELETE FROM current_relation_members WHERE id=#{relation} AND member_type='#{type}' AND member_id=#{objid}")
-end

 
 
 
 

-def sqlescape(a)
-  a.gsub(/[\000-\037]/,"").gsub("'","''").gsub(92.chr,92.chr+92.chr)
-end
+  # ====================================================================
+  # Relations handling
+  # deleteuniquenoderelations(uqn_name,uid,db_now)
+  # deleteitemrelations(way|node,'way'|'node',uid,db_now)

 
 

-def tag2array(a)
-  tags={}
-  a.gsub(';;;','#%').split(';').each do |b|
-    b.gsub!('#%',';;;')
-    b.gsub!('===','#%')
-    k,v=b.split('=')
-    if k.nil? then k='' end
-    if v.nil? then v='' end
-    tags[k.gsub('#%','=').gsub(':','|')]=v.gsub('#%','=')
-  end
-  tags
-end
+  def deleteuniquenoderelations(uqn_name,uid,db_now)
+    sql=<<-EOF
+  SELECT node_id,cr.id FROM #{uqn_name},current_relation_members crm,current_relations cr 
+   WHERE crm.member_id=node_id 
+     AND crm.member_type='node' 
+     AND crm.id=cr.id 
+     AND cr.visible=1
+  EOF
+
+    relnodes=ActiveRecord::Base.connection.select_all(sql)
+    relnodes.each do |a|
+      removefromrelation(a['node_id'],'node',a['id'],uid,db_now)
+    end
+  end

 
 

-def array2tag(a)
-  str=''
-  a.each do |k,v|
-    if v=='' then next end
-    if v[0,6]=='(type ' then next end
-    if str!='' then str+=';' end
-    str+=k.gsub(';',';;;').gsub('=','===').gsub('|',':')+'='+v.gsub(';',';;;').gsub('=','===')
+  def deleteitemrelations(objid,type,uid,db_now)
+    sql=<<-EOF
+  SELECT cr.id FROM current_relation_members crm,current_relations cr 
+   WHERE crm.member_id=#{objid} 
+     AND crm.member_type='#{type}' 
+     AND crm.id=cr.id 
+     AND cr.visible=1
+  EOF
+
+    relways=ActiveRecord::Base.connection.select_all(sql)
+    relways.each do |a|
+      removefromrelation(objid,type,a['id'],uid,db_now)
+    end

   end
   end

-  str
-end

 
 

-def getuserid(token)
-  if (token =~ /^(.+)\+(.+)$/) then
-    user = User.authenticate(:username => $1, :password => $2)
-  else
-    user = User.authenticate(:token => token)
+  def removefromrelation(objid,type,relation,uid,db_now)
+    rver=ActiveRecord::Base.connection.insert("INSERT INTO relations (id,user_id,timestamp,visible) VALUES (#{relation},#{uid},#{db_now},1)")
+
+    tagsql=<<-EOF
+  INSERT INTO relation_tags (id,k,v,version) 
+  SELECT id,k,v,#{rver} FROM current_relation_tags 
+   WHERE id=#{relation} 
+  EOF
+    ActiveRecord::Base.connection.insert(tagsql)
+
+    membersql=<<-EOF
+  INSERT INTO relation_members (id,member_type,member_id,member_role,version) 
+  SELECT id,member_type,member_id,member_role,#{rver} FROM current_relation_members 
+   WHERE id=#{relation} 
+     AND (member_id!=#{objid} OR member_type!='#{type}')
+  EOF
+    ActiveRecord::Base.connection.insert(membersql)
+
+    ActiveRecord::Base.connection.update("UPDATE current_relations SET user_id=#{uid},timestamp=#{db_now} WHERE id=#{relation}")
+    ActiveRecord::Base.connection.execute("DELETE FROM current_relation_members WHERE id=#{relation} AND member_type='#{type}' AND member_id=#{objid}")

   end
 
   end
 

-  return user ? user.id : nil;
-end
+  def sqlescape(a)
+    a.gsub(/[\000-\037]/,"").gsub("'","''").gsub(92.chr) {92.chr+92.chr}
+  end

 
 

+  def tag2array(a)
+    tags={}
+    Tags.split(a) do |k, v|
+      tags[k.gsub(':','|')]=v
+    end
+    tags
+  end

 
 

+  def array2tag(a)
+    tags = []
+    a.each do |k,v|
+      if v=='' then next end
+      if v[0,6]=='(type ' then next end
+      tags << [k.gsub('|',':'), v]
+    end
+    return Tags.join(tags)
+  end

 
 

-# ====================================================================
-# AMF read subroutines
+  def getuserid(token)
+    if (token =~ /^(.+)\+(.+)$/) then
+      user = User.authenticate(:username => $1, :password => $2)
+    else
+      user = User.authenticate(:token => token)
+    end

 
 

-# -----        getint          return two-byte integer
-# -----        getlong         return four-byte long
-# -----        getstring       return string with two-byte length
-# ----- getdouble      return eight-byte double-precision float
-# ----- getobject      return object/hash
-# ----- getarray       return numeric array
+    return user ? user.id : nil;
+  end

 
 

-def getint(s)
-  s.getc*256+s.getc
-end

 
 

-def getlong(s)
-  ((s.getc*256+s.getc)*256+s.getc)*256+s.getc
-end

 
 

-def getstring(s)
-  len=s.getc*256+s.getc
-  s.read(len)
-end
+  # ====================================================================
+  # AMF read subroutines

 
 

-def getdouble(s)
-  a=s.read(8).unpack('G')                      # G big-endian, E little-endian
-  a[0]
-end
+  # -----      getint          return two-byte integer
+  # -----      getlong         return four-byte long
+  # -----      getstring       return string with two-byte length
+  # ----- getdouble    return eight-byte double-precision float
+  # ----- getobject    return object/hash
+  # ----- getarray     return numeric array

 
 

-def getarray(s)
-  len=getlong(s)
-  arr=[]
-  for i in (0..len-1)
-    arr[i]=getvalue(s)
+  def getint(s)
+    s.getc*256+s.getc

   end
   end

-  arr
-end

 
 

-def getobject(s)
-  arr={}
-  while (key=getstring(s))
-    if (key=='') then break end
-    arr[key]=getvalue(s)
+  def getlong(s)
+    ((s.getc*256+s.getc)*256+s.getc)*256+s.getc

   end
   end

-  s.getc               # skip the 9 'end of object' value
-  arr
-end

 
 

-# -----        getvalue        parse and get value
-
-def getvalue(s)
-  case s.getc
-       when 0; return getdouble(s)                     # number
-       when 1; return s.getc                           # boolean
-       when 2; return getstring(s)                     # string
-       when 3; return getobject(s)                     # object/hash
-       when 5; return nil                                      # null
-       when 6; return nil                                      # undefined
-       when 8; s.read(4)                                       # mixedArray
-                       return getobject(s)                     #  |
-       when 10;return getarray(s)                      # array
-       else;   return nil                                      # error
+  def getstring(s)
+    len=s.getc*256+s.getc
+    s.read(len)

   end
   end

-end

 
 

-# ====================================================================
-# AMF write subroutines
+  def getdouble(s)
+    a=s.read(8).unpack('G')                    # G big-endian, E little-endian
+    a[0]
+  end

 
 

-# -----        putdata         envelope data into AMF writeable form
-# -----        encodevalue     pack variables as AMF
+  def getarray(s)
+    len=getlong(s)
+    arr=[]
+    for i in (0..len-1)
+      arr[i]=getvalue(s)
+    end
+    arr
+  end

 
 

-def putdata(index,n)
-  d =encodestring(index+"/onResult")
-  d+=encodestring("null")
-  d+=[-1].pack("N")
-  d+=encodevalue(n)
-end
+  def getobject(s)
+    arr={}
+    while (key=getstring(s))
+      if (key=='') then break end
+      arr[key]=getvalue(s)
+    end
+    s.getc             # skip the 9 'end of object' value
+    arr
+  end

 
 

-def encodevalue(n)
-  case n.class.to_s
-  when 'Array'
-    a=10.chr+encodelong(n.length)
-    n.each do |b|
-      a+=encodevalue(b)
+  # -----      getvalue        parse and get value
+
+  def getvalue(s)
+    case s.getc
+    when 0;    return getdouble(s)                     # number
+    when 1;    return s.getc                           # boolean
+    when 2;    return getstring(s)                     # string
+    when 3;    return getobject(s)                     # object/hash
+    when 5;    return nil                                      # null
+    when 6;    return nil                                      # undefined
+    when 8;    s.read(4)                                       # mixedArray
+      return getobject(s)                      #  |
+    when 10;return getarray(s)                 # array
+    else;      return nil                                      # error

     end
     end

-    a
-  when 'Hash'
-    a=3.chr
-    n.each do |k,v|
-      a+=encodestring(k)+encodevalue(v)
+  end
+
+  # ====================================================================
+  # AMF write subroutines
+
+  # -----      putdata         envelope data into AMF writeable form
+  # -----      encodevalue     pack variables as AMF
+
+  def putdata(index,n)
+    d =encodestring(index+"/onResult")
+    d+=encodestring("null")
+    d+=[-1].pack("N")
+    d+=encodevalue(n)
+  end
+
+  def encodevalue(n)
+    case n.class.to_s
+    when 'Array'
+      a=10.chr+encodelong(n.length)
+      n.each do |b|
+        a+=encodevalue(b)
+      end
+      a
+    when 'Hash'
+      a=3.chr
+      n.each do |k,v|
+        a+=encodestring(k)+encodevalue(v)
+      end
+      a+0.chr+0.chr+9.chr
+    when 'String'
+      2.chr+encodestring(n)
+    when 'Bignum','Fixnum','Float'
+      0.chr+encodedouble(n)
+    when 'NilClass'
+      5.chr
+    else
+      RAILS_DEFAULT_LOGGER.error("Unexpected Ruby type for AMF conversion: "+n.class.to_s)

     end
     end

-    a+0.chr+0.chr+9.chr
-  when 'String'
-    2.chr+encodestring(n)
-  when 'Bignum','Fixnum','Float'
-    0.chr+encodedouble(n)
-  when 'NilClass'
-    5.chr
-  else
-    RAILS_DEFAULT_LOGGER.error("Unexpected Ruby type for AMF conversion: "+n.class.to_s)

   end
   end

-end

 
 

-# -----        encodestring    encode string with two-byte length
-# -----        encodedouble    encode number as eight-byte double precision float
-# -----        encodelong              encode number as four-byte long
+  # -----      encodestring    encode string with two-byte length
+  # -----      encodedouble    encode number as eight-byte double precision float
+  # -----      encodelong              encode number as four-byte long

 
 

-def encodestring(n)
-  a,b=n.size.divmod(256)
-  a.chr+b.chr+n
-end
+  def encodestring(n)
+    a,b=n.size.divmod(256)
+    a.chr+b.chr+n
+  end

 
 

-def encodedouble(n)
-  [n].pack('G')
-end
+  def encodedouble(n)
+    [n].pack('G')
+  end

 
 

-def encodelong(n)
-  [n].pack('N')
-end
+  def encodelong(n)
+    [n].pack('N')
+  end

 
 

-# ====================================================================
-# Co-ordinate conversion
+  # ====================================================================
+  # Co-ordinate conversion

 
 

-def lat2coord(a,basey,masterscale)
-  -(lat2y(a)-basey)*masterscale+250
-end
+  def lat2coord(a,basey,masterscale)
+    -(lat2y(a)-basey)*masterscale+250
+  end

 
 

-def long2coord(a,baselong,masterscale)
-  (a-baselong)*masterscale+350
-end
+  def long2coord(a,baselong,masterscale)
+    (a-baselong)*masterscale+350
+  end

 
 

-def lat2y(a)
-  180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2))
-end
+  def lat2y(a)
+    180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2))
+  end

 
 

-def coord2lat(a,masterscale,basey)
-  y2lat((a-250)/-masterscale+basey)
-end
+  def coord2lat(a,masterscale,basey)
+    y2lat((a-250)/-masterscale+basey)
+  end

 
 

-def coord2long(a,masterscale,baselong)
-  (a-350)/masterscale+baselong
-end
+  def coord2long(a,masterscale,baselong)
+    (a-350)/masterscale+baselong
+  end

 
 

-def y2lat(a)
-  180/Math::PI * (2*Math.atan(Math.exp(a*Math::PI/180))-Math::PI/2)
-end
+  def y2lat(a)
+    180/Math::PI * (2*Math.atan(Math.exp(a*Math::PI/180))-Math::PI/2)
+  end

 
 end
 
 end