Implement atomic operations on MapEditor

app/controllers/champs/carte_controller.rb

@@ -40,6 +40,44 @@ class Champs::CarteController < ApplicationController
     response.status = 503
   end
 
+  def index
+    @selector = ".carte-#{params[:champ_id]}"
+    @champ = policy_scope(Champ).find(params[:champ_id])
+    @update_cadastres = params[:cadastres]
+
+    if @champ.cadastres? && @update_cadastres
+      @champ.geo_areas.cadastres.destroy_all
+      @champ.geo_areas += GeoArea.from_feature_collection(cadastres_features_collection(@champ.to_feature_collection))
+      @champ.save!
+    end
+  rescue ApiCarto::API::ResourceNotFound
+    flash.alert = 'Les données cartographiques sont temporairement indisponibles. Réessayez dans un instant.'
+    response.status = 503
+  end
+
+  def create
+    champ = policy_scope(Champ).find(params[:champ_id])
+    geo_area = champ.geo_areas.selections_utilisateur.new
+    save_geometry!(geo_area)
+
+    render json: { feature: geo_area.to_feature }, status: :created
+  end
+
+  def update
+    champ = policy_scope(Champ).find(params[:champ_id])
+    geo_area = champ.geo_areas.selections_utilisateur.find(params[:id])
+    save_geometry!(geo_area)
+
+    head :no_content
+  end
+
+  def destroy
+    champ = policy_scope(Champ).find(params[:champ_id])
+    champ.geo_areas.selections_utilisateur.find(params[:id]).destroy!
+
+    head :no_content
+  end
+
   private
 
   def populate_cadastres(feature_collection)
@@ -61,4 +99,37 @@ class Champs::CarteController < ApplicationController
       end
     end
   end
+
+  def save_geometry!(geo_area)
+    geo_area.geometry = params[:feature][:geometry]
+    geo_area.save!
+  end
+
+  def cadastres_features_collection(feature_collection)
+    coordinates = feature_collection[:features].filter do |feature|
+      feature[:properties][:source] == GeoArea.sources.fetch(:selection_utilisateur) && feature[:geometry]['type'] == 'Polygon'
+    end.map do |feature|
+      feature[:geometry]['coordinates'][0].map { |(lng, lat)| { 'lng' => lng, 'lat' => lat } }
+    end
+
+    if coordinates.present?
+      cadastres = ApiCartoService.generate_cadastre(coordinates)
+
+      {
+        type: 'FeatureCollection',
+        features: cadastres.map do |cadastre|
+          {
+            type: 'Feature',
+            geometry: cadastre.delete(:geometry),
+            properties: cadastre.merge(source: GeoArea.sources.fetch(:cadastre))
+          }
+        end
+      }
+    else
+      {
+        type: 'FeatureCollection',
+        features: []
+      }
+    end
+  end
 end