Refactor GridWeaponsController

- Refactors controller
- Adds YARD documentation
- Adds Rspec tests

app/controllers/api/v1/grid_weapons_controller.rb

@@ -2,110 +2,143 @@
 
 module Api
   module V1
+    ##
+    # Controller handling API requests related to grid weapons within a party.
+    #
+    # This controller provides endpoints for creating, updating, resolving conflicts, and deleting grid weapons.
+    # It ensures that the correct party and weapon are found and that the current user (or edit key) is authorized.
+    #
+    # @see Api::V1::ApiController for shared API behavior.
     class GridWeaponsController < Api::V1::ApiController
-      attr_reader :party, :incoming_weapon
+      before_action :find_grid_weapon, only: %i[update update_uncap_level resolve destroy]
-
+      before_action :find_party, only: %i[create update update_uncap_level resolve destroy]
-      before_action :set, except: %w[create update_uncap_level]
+      before_action :find_incoming_weapon, only: %i[create resolve]
-      before_action :find_party, only: :create
+      before_action :authorize_party_edit!, only: %i[create update update_uncap_level resolve destroy]
-      before_action :find_incoming_weapon, only: :create
-      before_action :authorize, only: %i[create update destroy]
 
+      ##
+      # Creates a new GridWeapon.
+      #
+      # Builds a new GridWeapon using parameters merged with the party and weapon IDs.
+      # If the model validations (including compatibility and conflict validations)
+      # pass, the weapon is saved; otherwise, conflict resolution is attempted.
+      #
+      # @return [void]
       def create
-        # Create the GridWeapon with the desired parameters
+        return render_unprocessable_entity_response(Api::V1::NoWeaponProvidedError.new) if @incoming_weapon.nil?
-        weapon = GridWeapon.new
-        weapon.attributes = weapon_params.merge(party_id: party.id, weapon_id: incoming_weapon.id)
 
-        if weapon.validate
+        grid_weapon = GridWeapon.new(
-          save_weapon(weapon)
+          weapon_params.merge(
+            party_id: @party.id,
+            weapon_id: @incoming_weapon.id
+          )
+        )
+
+        if grid_weapon.valid?
+          save_weapon(grid_weapon)
         else
-          handle_conflict(weapon)
+          if grid_weapon.errors[:series].include?('must not conflict with existing weapons')
+            handle_conflict(grid_weapon)
+          else
+            render_validation_error_response(grid_weapon)
+          end
         end
       end
 
+      ##
+      # Updates an existing GridWeapon.
+      #
+      # After checking authorization, assigns new attributes to the weapon.
+      # Also normalizes modifier and strength fields, then renders the updated view on success.
+      #
+      # @return [void]
+      def update
+        normalize_ax_fields!
+        if @grid_weapon.update(weapon_params)
+          render json: GridWeaponBlueprint.render(@grid_weapon, view: :full, root: :grid_weapon), status: :ok
+        else
+          render_validation_error_response(@grid_weapon)
+        end
+      end
+
+      ##
+      # Updates the uncap level and transcendence step of a GridWeapon.
+      #
+      # Finds the weapon to update, computes the maximum allowed uncap level based on its associated
+      # weapon’s flags, and then updates the fields accordingly.
+      #
+      # @return [void]
+      def update_uncap_level
+        max_uncap = compute_max_uncap_level(@grid_weapon.weapon)
+        requested_uncap = weapon_params[:uncap_level].to_i
+        new_uncap = requested_uncap > max_uncap ? max_uncap : requested_uncap
+
+        if @grid_weapon.update(uncap_level: new_uncap, transcendence_step: weapon_params[:transcendence_step].to_i)
+          render json: GridWeaponBlueprint.render(@grid_weapon, view: :full, root: :grid_weapon), status: :ok
+        else
+          render_validation_error_response(@grid_weapon)
+        end
+      end
+
+      ##
+      # Resolves conflicts by removing conflicting grid weapons and creating a new one.
+      #
+      # Expects resolve parameters that include the desired position, the incoming weapon ID,
+      # and a list of conflicting GridWeapon IDs. After deleting conflicting records and any existing
+      # grid weapon at that position, creates a new GridWeapon with computed uncap_level.
+      #
+      # @return [void]
       def resolve
-        incoming = Weapon.find(resolve_params[:incoming])
+        incoming = Weapon.find_by(id: resolve_params[:incoming])
-        conflicting = resolve_params[:conflicting].map { |id| GridWeapon.find(id) }
+        conflicting_ids = resolve_params[:conflicting]
-        party = conflicting.first.party
+        conflicting_weapons = GridWeapon.where(id: conflicting_ids)
 
         # Destroy each conflicting weapon
-        conflicting.each { |weapon| GridWeapon.destroy(weapon.id) }
+        conflicting_weapons.each(&:destroy)
 
         # Destroy the weapon at the desired position if it exists
-        existing_weapon = GridWeapon.where(party: party.id, position: resolve_params[:position]).first
+        if (existing_weapon = GridWeapon.find_by(party_id: @party.id, position: resolve_params[:position]))
-        GridWeapon.destroy(existing_weapon.id) if existing_weapon
+          existing_weapon.destroy
+        end
 
-        uncap_level = 3
+        # Compute the default uncap level based on incoming weapon flags, maxing out at ULB.
-        uncap_level = 4 if incoming.flb
+        new_uncap = compute_default_uncap(incoming)
-        uncap_level = 5 if incoming.ulb
+        grid_weapon = GridWeapon.create!(
-
+          party_id: @party.id,
-        weapon = GridWeapon.create!(party_id: party.id, weapon_id: incoming.id,
+          weapon_id: incoming.id,
-                                    position: resolve_params[:position], uncap_level: uncap_level)
+          position: resolve_params[:position],
-
+          uncap_level: new_uncap,
-        return unless weapon.save
+          transcendence_step: 0
-
-        view = render_grid_weapon_view(weapon, resolve_params[:position])
-        render json: view, status: :created
-      end
-
-      def update
-        render_unauthorized_response if current_user && (@weapon.party.user != current_user)
-
-        # TODO: Server-side validation of weapon mods
-        # We don't want someone modifying the JSON and adding
-        # keys to weapons that cannot have them
-
-        # Maybe we make methods on the model to validate for us somehow
-
-        @weapon.assign_attributes(weapon_params)
-
-        @weapon.ax_modifier1 = nil if weapon_params[:ax_modifier1] == -1
-        @weapon.ax_modifier2 = nil if weapon_params[:ax_modifier2] == -1
-        @weapon.ax_strength1 = nil if weapon_params[:ax_strength1]&.zero?
-        @weapon.ax_strength2 = nil if weapon_params[:ax_strength2]&.zero?
-
-        render json: GridWeaponBlueprint.render(@weapon, view: :nested) if @weapon.save
-      end
-
-      def destroy
-        render_unauthorized_response if @weapon.party.user != current_user
-        return render json: GridCharacterBlueprint.render(@weapon, view: :destroyed) if @weapon.destroy
-      end
-
-      def update_uncap_level
-        weapon = GridWeapon.find(weapon_params[:id])
-        object = weapon.weapon
-        max_uncap_level = max_uncap_level(object)
-
-        render_unauthorized_response if current_user && (weapon.party.user != current_user)
-
-        greater_than_max_uncap = weapon_params[:uncap_level].to_i > max_uncap_level
-        can_be_transcended = object.transcendence && weapon_params[:transcendence_step] && weapon_params[:transcendence_step]&.to_i&.positive?
-
-        uncap_level = if greater_than_max_uncap || can_be_transcended
-                        max_uncap_level
-                      else
-                        weapon_params[:uncap_level]
-                      end
-
-        transcendence_step = if object.transcendence && weapon_params[:transcendence_step]
-                               weapon_params[:transcendence_step]
-                             else
-                               0
-                             end
-
-        weapon.update!(
-          uncap_level: uncap_level,
-          transcendence_step: transcendence_step
         )
 
-        return unless weapon.persisted?
+        if grid_weapon.persisted?
+          render json: GridWeaponBlueprint.render(grid_weapon, view: :full, root: :grid_weapon, meta: { replaced: resolve_params[:position] }), status: :created
+        else
+          render_validation_error_response(grid_weapon)
+        end
+      end
 
-        render json: GridWeaponBlueprint.render(weapon, view: :nested, root: :grid_weapon)
+      ##
+      # Destroys a GridWeapon.
+      #
+      # Checks authorization and, if allowed, destroys the weapon and renders the destroyed view.
+      #
+      # @return [void]
+      def destroy
+        grid_weapon = GridWeapon.find_by('id = ?', params[:id])
+
+        return render_not_found_response('grid_weapon') if grid_weapon.nil?
+
+        render json: GridWeaponBlueprint.render(grid_weapon, view: :destroyed), status: :ok if grid_weapon.destroy
       end
 
       private
 
-      def max_uncap_level(weapon)
+      ##
+      # Computes the maximum uncap level for a given weapon based on its flags.
+      #
+      # @param weapon [Weapon] the associated weapon.
+      # @return [Integer] the maximum allowed uncap level.
+      def compute_max_uncap_level(weapon)
         if weapon.flb && !weapon.ulb && !weapon.transcendence
           4
         elsif weapon.ulb && !weapon.transcendence
@@ -117,122 +150,213 @@ module Api
         end
       end
 
-      def check_weapon_compatibility
+      ##
-        return if compatible_with_position?(incoming_weapon, weapon_params[:position])
+      # Computes the default uncap level for an incoming weapon.
-
+      #
-        raise Api::V1::IncompatibleWeaponForPositionError.new(weapon: incoming_weapon)
+      # This method calculates the default uncap level by computing the maximum uncap level based on the weapon's flags.
+      #
+      # @param incoming [Weapon] the incoming weapon.
+      # @return [Integer] the default uncap level.
+      def compute_default_uncap(incoming)
+        compute_max_uncap_level(incoming)
       end
 
-      # Check if the incoming weapon is compatible with the specified position
+      ##
-      def compatible_with_position?(incoming_weapon, position)
+      # Normalizes the AX modifier fields for the weapon parameters.
-        false if [9, 10, 11].include?(position.to_i) && ![11, 16, 17, 28, 29, 34].include?(incoming_weapon.series)
+      #
-        true
+      # Sets ax_modifier1 and ax_modifier2 to nil if their integer values equal -1.
-      end
+      #
-
+      # @return [void]
-      def conflict_weapon
+      def normalize_ax_fields!
-        @conflict_weapon ||= find_conflict_weapon(party, incoming_weapon)
+        params[:weapon][:ax_modifier1] = nil if weapon_params[:ax_modifier1].to_i == -1
-      end
+
-
+        params[:weapon][:ax_modifier2] = nil if weapon_params[:ax_modifier2].to_i == -1
-      # Find a conflict weapon if one exists
-      def find_conflict_weapon(party, incoming_weapon)
-        return unless incoming_weapon.limit
-
-        party.weapons.find do |weapon|
-          series_match = incoming_weapon.series == weapon.weapon.series
-          weapon if series_match || opus_or_draconic?(weapon.weapon) && opus_or_draconic?(incoming_weapon)
-        end
-      end
-
-      def find_incoming_weapon
-        @incoming_weapon = Weapon.find_by(id: weapon_params[:weapon_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(weapon_params[:party_id])
-        render_unauthorized_response if current_user && (party.user != current_user)
-      end
-
-      def opus_or_draconic?(weapon)
-        [2, 3].include?(weapon.series)
-      end
-
-      # Render the conflict view as a string
-      def render_conflict_view(conflict_weapons, incoming_weapon, incoming_position)
-        ConflictBlueprint.render(nil, view: :weapons,
-                                      conflict_weapons: conflict_weapons,
-                                      incoming_weapon: incoming_weapon,
-                                      incoming_position: incoming_position)
       end
 
+      ##
+      # Renders the grid weapon view.
+      #
+      # @param grid_weapon [GridWeapon] the grid weapon to render.
+      # @param conflict_position [Integer] the position that was replaced.
+      # @return [String] the rendered view.
       def render_grid_weapon_view(grid_weapon, conflict_position)
-        GridWeaponBlueprint.render(grid_weapon, view: :full,
+        GridWeaponBlueprint.render(grid_weapon,
-                                                root: :grid_weapon,
+                                   view: :full,
-                                                meta: { replaced: conflict_position })
+                                   root: :grid_weapon,
+                                   meta: { replaced: conflict_position })
       end
 
+      ##
+      # Saves the GridWeapon.
+      #
+      # Deletes any existing grid weapon at the same position,
+      # adjusts party attributes based on the weapon's position,
+      # and renders the full view upon successful save.
+      #
+      # @param weapon [GridWeapon] the grid weapon to save.
+      # @return [void]
       def save_weapon(weapon)
-        # Check weapon validation and delete existing grid weapon
+        # Check weapon validation and delete existing grid weapon if one already exists at position
-        # if one already exists at position
+        if (existing = GridWeapon.find_by(party_id: @party.id, position: weapon.position))
-        if (grid_weapon = GridWeapon.where(
+          existing.destroy
-          party_id: party.id,
-          position: weapon_params[:position]
-        ).first)
-          GridWeapon.destroy(grid_weapon.id)
         end
 
         # Set the party's element if the grid weapon is being set as mainhand
-        if weapon.position == -1
+        if weapon.position.to_i == -1
-          party.element = weapon.weapon.element
+          @party.element = weapon.weapon.element
-          party.save!
+          @party.save!
-        elsif [9, 10, 11].include?(weapon.position)
+        elsif GridWeapon::EXTRA_POSITIONS.include?(weapon.position.to_i)
-          party.extra = true
+          @party.extra = true
-          party.save!
+          @party.save!
         end
 
-        # Render the weapon if it can be saved
+        if weapon.save
-        return unless weapon.save
+          output = GridWeaponBlueprint.render(weapon, view: :full, root: :grid_weapon)
-
+          render json: output, status: :created
-        output = GridWeaponBlueprint.render(weapon, view: :full, root: :grid_weapon)
+        else
-        render json: output, status: :created
+          render_validation_error_response(weapon)
+        end
       end
 
+      ##
+      # Handles conflicts when a new GridWeapon fails validation.
+      #
+      # Retrieves the array of conflicting grid weapons (via the model’s conflicts method)
+      # and either renders a conflict view (if the canonical weapons differ) or updates the
+      # conflicting grid weapon's position.
+      #
+      # @param weapon [GridWeapon] the weapon that failed validation.
+      # @return [void]
       def handle_conflict(weapon)
         conflict_weapons = weapon.conflicts(party)
+        # Find if one of the conflicting grid weapons is associated with the incoming weapon.
+        conflict_weapon = conflict_weapons.find { |gw| gw.weapon.id == incoming_weapon.id }
 
-        # Map conflict weapon IDs into an array
+        if conflict_weapon.nil?
-        conflict_weapon_ids = conflict_weapons.map(&:id)
-        if !conflict_weapon_ids.include?(incoming_weapon.id)
-          # Render conflict view if the underlying canonical weapons
-          # are not identical
           output = render_conflict_view(conflict_weapons, incoming_weapon, weapon_params[:position])
           render json: output
         else
-          # Move the original grid weapon to the new position
-          # to preserve keys and other modifications
           old_position = conflict_weapon.position
           conflict_weapon.position = weapon_params[:position]
-
           if conflict_weapon.save
             output = render_grid_weapon_view(conflict_weapon, old_position)
             render json: output
+          else
+            render_validation_error_response(conflict_weapon)
           end
         end
       end
 
-      def set
+      ##
-        @weapon = GridWeapon.where('id = ?', params[:id]).first
+      # Renders the conflict view.
+      #
+      # @param conflict_weapons [Array<GridWeapon>] an array of conflicting grid weapons.
+      # @param incoming_weapon [Weapon] the incoming weapon.
+      # @param incoming_position [Integer] the desired position.
+      # @return [String] the rendered conflict view.
+      def render_conflict_view(conflict_weapons, incoming_weapon, incoming_position)
+        ConflictBlueprint.render(nil,
+                                 view: :weapons,
+                                 conflict_weapons: conflict_weapons,
+                                 incoming_weapon: incoming_weapon,
+                                 incoming_position: incoming_position)
       end
 
-      def authorize
+      ##
-        # Create
+      # Finds and sets the GridWeapon based on the provided parameters.
-        unauthorized_create = @party && (@party.user != current_user || @party.edit_key != edit_key)
+      #
-        unauthorized_update = @weapon && @weapon.party && (@weapon.party.user != current_user || @weapon.party.edit_key != edit_key)
+      # Searches for a grid weapon using various parameter keys and renders a not found response if it is absent.
-
+      #
-        render_unauthorized_response if unauthorized_create || unauthorized_update
+      # @return [void]
+      def find_grid_weapon
+        grid_weapon_id = params[:id] || params.dig(:weapon, :id) || params.dig(:resolve, :conflicting)
+        @grid_weapon = GridWeapon.find_by(id: grid_weapon_id)
+        render_not_found_response('grid_weapon') unless @grid_weapon
       end
 
-      # Specify whitelisted properties that can be modified.
+      ##
+      # Finds and sets the incoming weapon.
+      #
+      # @return [void]
+      def find_incoming_weapon
+        if params.dig(:weapon, :weapon_id).present?
+          @incoming_weapon = Weapon.find_by(id: params.dig(:weapon, :weapon_id))
+          render_not_found_response('weapon') unless @incoming_weapon
+        else
+          @incoming_weapon = nil
+        end
+      end
+
+      ##
+      # Finds and sets the party based on parameters.
+      #
+      # Renders an unauthorized response if the current user is not the owner.
+      #
+      # @return [void]
+      def find_party
+        @party = Party.find_by(id: params.dig(:weapon, :party_id)) || Party.find_by(id: params[:party_id]) || @grid_weapon&.party
+        render_not_found_response('party') unless @party
+      end
+
+      ##
+      # Authorizes the current action by ensuring that the current user or provided edit key matches the party's owner.
+      #
+      # For parties associated with a user, it verifies that the current_user is the owner.
+      # For anonymous parties, it checks that the provided edit key matches the party's edit key.
+      #
+      # @return [void]
+      def authorize_party_edit!
+        if @party.user.present?
+          authorize_user_party
+        else
+          authorize_anonymous_party
+        end
+      end
+
+      ##
+      # Authorizes an action for a party that belongs to a user.
+      #
+      # Renders an unauthorized response unless the current user is present and
+      # matches the party's user.
+      #
+      # @return [void]
+      def authorize_user_party
+        return if current_user.present? && @party.user == current_user
+
+        return render_unauthorized_response
+      end
+
+      ##
+      # Authorizes an action for an anonymous party using an edit key.
+      #
+      # Retrieves and normalizes the provided edit key and compares it with the party's edit key.
+      # Renders an unauthorized response unless the keys are valid.
+      #
+      # @return [void]
+      def authorize_anonymous_party
+        provided_edit_key = edit_key.to_s.strip.force_encoding('UTF-8')
+        party_edit_key = @party.edit_key.to_s.strip.force_encoding('UTF-8')
+        return if valid_edit_key?(provided_edit_key, party_edit_key)
+
+        return render_unauthorized_response
+      end
+
+      ##
+      # Validates that the provided edit key matches the party's edit key.
+      #
+      # @param provided_edit_key [String] the edit key provided in the request.
+      # @param party_edit_key [String] the edit key associated with the party.
+      # @return [Boolean] true if the edit keys match; false otherwise.
+      def valid_edit_key?(provided_edit_key, party_edit_key)
+        provided_edit_key.present? &&
+          provided_edit_key.bytesize == party_edit_key.bytesize &&
+          ActiveSupport::SecurityUtils.secure_compare(provided_edit_key, party_edit_key)
+      end
+
+      ##
+      # Specifies and permits the allowed weapon parameters.
+      #
+      # @return [ActionController::Parameters] the permitted parameters.
       def weapon_params
         params.require(:weapon).permit(
           :id, :party_id, :weapon_id,
@@ -243,6 +367,10 @@ module Api
         )
       end
 
+      ##
+      # Specifies and permits the resolve parameters.
+      #
+      # @return [ActionController::Parameters] the permitted parameters.
       def resolve_params
         params.require(:resolve).permit(:position, :incoming, conflicting: [])
       end

spec/requests/grid_weapons_controller_spec.rb

@@ -0,0 +1,363 @@
+# frozen_string_literal: true
+require 'rails_helper'
+
+RSpec.describe 'GridWeapons API', type: :request do
+  let(:user) { create(:user) }
+  # By default, we create a party owned by the user with edit_key 'secret'
+  let(:party) { create(:party, user: user, edit_key: 'secret') }
+  let(:access_token) do
+    Doorkeeper::AccessToken.create!(
+      resource_owner_id: user.id,
+      expires_in: 30.days,
+      scopes: 'public'
+    )
+  end
+  let(:headers) do
+    {
+      'Authorization' => "Bearer #{access_token.token}",
+      'Content-Type' => 'application/json',
+    }
+  end
+  let(:weapon) { Weapon.find_by!(granblue_id: '1040611300') }
+  let(:incoming_weapon) { Weapon.find_by!(granblue_id: '1040912100') }
+
+  describe 'Authorization for editing grid weapons' do
+    context 'when the party is owned by a logged in user' do
+      let(:weapon_params) do
+        {
+          weapon: {
+            party_id: party.id,
+            weapon_id: weapon.id,
+            position: 0,
+            mainhand: true,
+            uncap_level: 3,
+            transcendence_step: 0,
+            element: weapon.element,
+          }
+        }
+      end
+
+      it 'allows the owner to create a grid weapon' do
+        expect do
+          post '/api/v1/weapons', params: weapon_params.to_json, headers: headers
+        end.to change(GridWeapon, :count).by(1)
+        expect(response).to have_http_status(:created)
+      end
+
+      it 'rejects a logged-in user that does not own the party' do
+        # Create a party owned by a different user.
+        other_user = create(:user)
+        party_owned_by_other = create(:party, user: other_user, edit_key: 'secret')
+        weapon_params[:weapon][:party_id] = party_owned_by_other.id
+        post '/api/v1/weapons', params: weapon_params.to_json, headers: headers
+        expect(response).to have_http_status(:unauthorized)
+      end
+    end
+
+    context 'when the party is anonymous (no user)' do
+      # Override party to be anonymous with its own edit_key.
+      let(:headers) { super().merge('X-Edit-Key' => 'anonsecret') }
+      let(:party) { create(:party, user: nil, edit_key: 'anonsecret') }
+      let(:anon_params) do
+        {
+          weapon: {
+            party_id: party.id,
+            weapon_id: weapon.id,
+            position: 0,
+            mainhand: true,
+            uncap_level: 3,
+            transcendence_step: 0,
+            element: weapon.element,
+          }
+        }
+      end
+
+      it 'allows editing with correct edit_key' do
+        expect { post '/api/v1/weapons', params: anon_params.to_json, headers: headers }
+          .to change(GridWeapon, :count).by(1)
+        expect(response).to have_http_status(:created)
+      end
+
+      context 'when an incorrect edit_key is provided' do
+        # Override the edit_key (simulate invalid key)
+        let(:headers) { super().merge('X-Edit-Key' => 'wrong') }
+
+        it 'returns an unauthorized response' do
+          post '/api/v1/weapons', params: anon_params.to_json, headers: headers
+          expect(response).to have_http_status(:unauthorized)
+        end
+      end
+    end
+  end
+
+  describe 'POST /api/v1/weapons (create action)' do
+    context 'with valid parameters' do
+      let(:valid_params) do
+        {
+          weapon: {
+            party_id: party.id,
+            weapon_id: weapon.id,
+            position: 0,
+            mainhand: true,
+            uncap_level: 3,
+            transcendence_step: 0,
+            element: weapon.element,
+            weapon_key1_id: nil,
+            weapon_key2_id: nil,
+            weapon_key3_id: nil,
+            ax_modifier1: nil,
+            ax_modifier2: nil,
+            ax_strength1: nil,
+            ax_strength2: nil,
+            awakening_id: nil,
+            awakening_level: 1,
+          }
+        }
+      end
+
+      it 'creates a grid weapon and returns status created' do
+        expect { post '/api/v1/weapons', params: valid_params.to_json, headers: headers }
+          .to change(GridWeapon, :count).by(1)
+        expect(response).to have_http_status(:created)
+        json_response = JSON.parse(response.body)
+        expect(json_response).to have_key('grid_weapon')
+        expect(json_response['grid_weapon']).to include('position' => 0)
+      end
+    end
+
+    context 'with invalid parameters' do
+      let(:invalid_params) do
+        {
+          weapon: {
+            party_id: party.id,
+            weapon_id: nil, # Missing required weapon_id
+            position: 0,
+            mainhand: true,
+            uncap_level: 3,
+            transcendence_step: 0
+          }
+        }
+      end
+
+      it 'returns unprocessable entity status with errors' do
+        post '/api/v1/weapons', params: invalid_params.to_json, headers: headers
+        expect(response).to have_http_status(:unprocessable_entity)
+        json_response = JSON.parse(response.body)
+        expect(json_response).to have_key('errors')
+      end
+    end
+
+    context 'when unauthorized (invalid edit key)' do
+      # For this test, use an anonymous party so that edit key checking is applied.
+      let(:party) { create(:party, user: nil, edit_key: 'anonsecret') }
+      let(:valid_params) do
+        {
+          weapon: {
+            party_id: party.id,
+            weapon_id: weapon.id,
+            position: 0,
+            mainhand: true,
+            uncap_level: 3,
+            transcendence_step: 0,
+            element: weapon.element,
+          }
+        }
+      end
+
+      let(:unauthorized_headers) { headers.merge('X-Edit-Key' => 'wrong') }
+
+      it 'returns an unauthorized response' do
+        post '/api/v1/weapons', params: valid_params.to_json, headers: unauthorized_headers
+        expect(response).to have_http_status(:unauthorized)
+      end
+    end
+  end
+
+  describe 'PUT /api/v1/grid_weapons/:id (update action)' do
+    let!(:grid_weapon) do
+      create(:grid_weapon,
+             party: party,
+             weapon: weapon,
+             position: 2,
+             uncap_level: 3,
+             transcendence_step: 0,
+             mainhand: false)
+    end
+    let(:update_params) do
+      {
+        weapon: {
+          id: grid_weapon.id,
+          party_id: party.id,
+          weapon_id: weapon.id,
+          position: 2,
+          mainhand: false,
+          uncap_level: 4,
+          transcendence_step: 1,
+          element: weapon.element,
+          weapon_key1_id: nil,
+          weapon_key2_id: nil,
+          weapon_key3_id: nil,
+          ax_modifier1: nil,
+          ax_modifier2: nil,
+          ax_strength1: nil,
+          ax_strength2: nil,
+          awakening_id: nil,
+          awakening_level: 1
+        }
+      }
+    end
+
+    it 'updates the grid weapon and returns the updated record' do
+      put "/api/v1/grid_weapons/#{grid_weapon.id}", params: update_params.to_json, headers: headers
+      expect(response).to have_http_status(:ok)
+      json_response = JSON.parse(response.body)
+      expect(json_response['grid_weapon']).to include('mainhand' => false, 'uncap_level' => 4)
+    end
+  end
+
+  describe 'POST /api/v1/weapons/update_uncap (update uncap level action)' do
+    before do
+      # For this test, update the weapon so that its conditions dictate a maximum uncap of 5.
+      weapon.update!(flb: false, ulb: true, transcendence: false)
+    end
+    let!(:grid_weapon) do
+      create(:grid_weapon,
+             party: party,
+             weapon: weapon,
+             position: 3,
+             uncap_level: 3,
+             transcendence_step: 0)
+    end
+    let(:update_uncap_params) do
+      {
+        weapon: {
+          id: grid_weapon.id, # now nested inside the weapon hash
+          party_id: party.id,
+          weapon_id: weapon.id,
+          uncap_level: 6, # attempt above allowed; should be capped at 5
+          transcendence_step: 0
+        }
+      }
+    end
+
+    it 'updates the uncap level to 5 for the grid weapon' do
+      post '/api/v1/weapons/update_uncap', params: update_uncap_params.to_json, headers: headers
+      expect(response).to have_http_status(:ok)
+      json_response = JSON.parse(response.body)
+      expect(json_response['grid_weapon']).to include('uncap_level' => 5)
+    end
+  end
+
+  describe 'POST /api/v1/weapons/resolve (conflict resolution action)' do
+    let!(:conflicting_weapon) do
+      create(:grid_weapon,
+             party: party,
+             weapon: weapon,
+             position: 5,
+             uncap_level: 3)
+    end
+
+    before do
+      # Set up the incoming weapon with flags such that: default uncap is 3,
+      # but if flb is true then uncap should become 4.
+      incoming_weapon.update!(flb: true, ulb: false, transcendence: false)
+    end
+
+    let(:resolve_params) do
+      {
+        resolve: {
+          position: 5,
+          incoming: incoming_weapon.id,
+          conflicting: [conflicting_weapon.id]
+        }
+      }
+    end
+
+    it 'resolves conflicts by destroying conflicting grid weapons and creating a new one' do
+      expect(GridWeapon.exists?(conflicting_weapon.id)).to be true
+
+      # The net change should be zero: one grid weapon is destroyed and one is created.
+      expect { post '/api/v1/weapons/resolve', params: resolve_params.to_json, headers: headers }
+        .to change(GridWeapon, :count).by(0)
+      expect(response).to have_http_status(:created)
+      json_response = JSON.parse(response.body)
+      expect(json_response).to have_key('grid_weapon')
+      # According to the controller logic, with incoming.flb true, the uncap level should be 4.
+      expect(json_response['grid_weapon']).to include('uncap_level' => 4)
+      expect { conflicting_weapon.reload }.to raise_error(ActiveRecord::RecordNotFound)
+    end
+  end
+
+  describe 'DELETE /api/v1/grid_weapons/:id (destroy action)' do
+    context 'when the party is owned by a logged in user' do
+      let!(:grid_weapon) do
+        create(:grid_weapon,
+               party: party,
+               weapon: weapon,
+               position: 4,
+               uncap_level: 3)
+      end
+
+      it 'destroys the grid weapon and returns a success response' do
+        expect { delete "/api/v1/grid_weapons/#{grid_weapon.id}", headers: headers }
+          .to change(GridWeapon, :count).by(-1)
+        expect(response).to have_http_status(:ok)
+      end
+
+      it 'returns not found when trying to delete a non-existent grid weapon' do
+        delete '/api/v1/grid_weapons/00000000-0000-0000-0000-000000000000', headers: headers
+        expect(response).to have_http_status(:not_found)
+      end
+    end
+
+    context 'when the party is anonymous (no user)' do
+      # For anonymous users, we override both the party and header edit key.
+      let(:headers) { super().merge('X-Edit-Key' => 'anonsecret') }
+      let(:party) { create(:party, user: nil, edit_key: 'anonsecret') }
+      let!(:grid_weapon) do
+        create(:grid_weapon,
+               party: party,
+               weapon: weapon,
+               position: 4,
+               uncap_level: 3)
+      end
+
+      it 'allows anonymous user to destroy grid weapon with correct edit key' do
+        expect { delete "/api/v1/grid_weapons/#{grid_weapon.id}", headers: headers }
+          .to change(GridWeapon, :count).by(-1)
+        expect(response).to have_http_status(:ok)
+      end
+
+      it 'prevents destruction with incorrect edit key' do
+        wrong_headers = headers.merge('X-Edit-Key' => 'wrong')
+        delete "/api/v1/grid_weapons/#{grid_weapon.id}", headers: wrong_headers
+        expect(response).to have_http_status(:unauthorized)
+      end
+
+      it 'prevents deletion when a logged in user attempts to delete an anonymous grid weapon' do
+        # When a logged in user (with an access token) tries to delete a grid weapon
+        # that belongs to an anonymous party, authorization should fail.
+        auth_headers = headers.except('X-Edit-Key')
+        expect { delete "/api/v1/grid_weapons/#{grid_weapon.id}", headers: auth_headers }
+          .not_to change(GridWeapon, :count)
+        expect(response).to have_http_status(:unauthorized)
+      end
+    end
+  end
+
+  # Debug hook: if any example fails and a response exists, print the error message.
+  after(:each) do |example|
+    if example.exception && defined?(response) && response.present?
+      error_message = begin
+                        JSON.parse(response.body)['exception']
+                      rescue JSON::ParserError
+                        response.body
+                      end
+      puts "\nDEBUG: Error Message for '#{example.full_description}': #{error_message}"
+      # Parse once and grab the trace safely
+      parsed_body = JSON.parse(response.body)
+      trace = parsed_body.dig('traces', 'Application Trace')
+      ap trace if trace # Only print if trace is not nil
+    end
+  end
+end