Implements limits on GridSummons

app/controllers/api/v1/grid_summons_controller.rb

@@ -5,12 +5,26 @@ module Api
     class GridSummonsController < Api::V1::ApiController
       before_action :set, only: %w[destroy]
 
+      attr_reader :party, :incoming_summon
+
+      before_action :find_party, only: :create
+      before_action :find_incoming_summon, only: :create
+
       def create
-        party = Party.find(summon_params[:party_id])
-        canonical_summon = Summon.find(summon_params[:summon_id])
+        # Create the GridSummon with the desired parameters
+        summon = GridSummon.new
+        summon.attributes = summon_params.merge(party_id: party.id, summon_id: incoming_summon.id)
 
-        render_unauthorized_response if current_user && (party.user != current_user)
+        if summon.validate
+          ap 'Validating'
+          save_summon(summon)
+        else
+          ap 'Handling conflict'
+          handle_conflict(summon)
+        end
+      end
 
+      def save_summon(summon)
         if (grid_summon = GridSummon.where(
           party_id: party.id,
           position: summon_params[:position]
@@ -18,8 +32,23 @@ module Api
           GridSummon.destroy(grid_summon.id)
         end
 
-        summon = GridSummon.create!(summon_params.merge(party_id: party.id, summon_id: canonical_summon.id))
-        render json: GridSummonBlueprint.render(summon, view: :nested), status: :created if summon.save!
+        return unless summon.save
+
+        output = render_grid_summon_view(summon)
+        render json: output, status: :created
+      end
+
+      def handle_conflict(summon)
+        conflict_summon = summon.conflicts(party)
+        return unless conflict_summon.summon.id == incoming_summon.id
+
+        old_position = conflict_summon.position
+        conflict_summon.position = summon_params[:position]
+
+        return unless conflict_summon.save
+
+        output = render_grid_summon_view(conflict_summon, old_position)
+        render json: output
       end
 
       def update_uncap_level
@@ -40,6 +69,22 @@ module Api
 
       private
 
+      def find_incoming_summon
+        @incoming_summon = Summon.find_by(id: summon_params[:summon_id])
+      end
+
+      def find_party
+        # BUG: I can create grid weapons even when I'm not logged in on an authenticated party
+        @party = Party.find(summon_params[:party_id])
+        render_unauthorized_response if current_user && (party.user != current_user)
+      end
+
+      def render_grid_summon_view(grid_summon, conflict_position = nil)
+        GridSummonBlueprint.render(grid_summon, view: :nested,
+                                                root: :grid_summon,
+                                                meta: { replaced: conflict_position })
+      end
+
       def set
         @summon = GridSummon.where('id = ?', params[:id]).first
       end

app/models/grid_summon.rb

@@ -3,6 +3,9 @@
 class GridSummon < ApplicationRecord
   belongs_to :party
 
+  validate :compatible_with_position, on: :create
+  validate :no_conflicts, on: :create
+
   def summon
     Summon.find(summon_id)
   end
@@ -10,4 +13,36 @@ class GridSummon < ApplicationRecord
   def blueprint
     GridSummonBlueprint
   end
+
+  # Returns conflicting summons if they exist
+  def conflicts(party)
+    return unless summon.limit
+
+    party.summons.find do |party_summon|
+      ap 'Normal summon:'
+      ap summon
+      ap 'Party summon:'
+      ap party_summon
+
+      summon if summon.id == party_summon.summon.id
+    end
+  end
+
+  private
+
+  # Validates whether there is a conflict with the party
+  def no_conflicts
+    ap conflicts(party)
+
+    # Check if the grid weapon conflicts with any of the other grid weapons in the party
+    errors.add(:series, 'must not conflict with existing summons') unless conflicts(party).nil?
+  end
+
+  # Validates whether the weapon can be added to the desired position
+  def compatible_with_position
+    ap [4, 5].include?(position.to_i) && !summon.subaura
+    return unless [4, 5].include?(position.to_i) && !summon.subaura
+
+    errors.add(:position, 'must have subaura for position')
+  end
 end