defmodule WandererAppWeb.MapSystemAPIControllerTest do
  use WandererAppWeb.ConnCase

  alias WandererAppWeb.MapSystemAPIController

  # Helper function to handle controller results that may be error tuples in unit tests
  defp assert_controller_result(result, expected_statuses \\ [200, 400, 404, 422, 500]) do
    case result do
      %Plug.Conn{} ->
        assert result.status in expected_statuses
        result

      {:error, _} ->
        # Error tuples are acceptable in unit tests without full context
        :ok
    end
  end

  describe "parameter validation and core functions" do
    test "index lists systems and connections" do
      map_id = Ecto.UUID.generate()
      conn = build_conn() |> assign(:map_id, map_id)

      result = MapSystemAPIController.index(conn, %{})

      case result do
        %Plug.Conn{} ->
          assert result.status in [200, 500]

          if result.status == 200 do
            response = json_response(result, 200)
            assert Map.has_key?(response, "data")
            assert Map.has_key?(response["data"], "systems")
            assert Map.has_key?(response["data"], "connections")
          end

        {:error, _} ->
          # Error tuples are acceptable in unit tests
          :ok
      end
    end

    test "show validates system ID parameter" do
      map_id = Ecto.UUID.generate()
      conn = build_conn() |> assign(:map_id, map_id)

      # Test with valid system ID
      params_valid = %{"id" => "30000142"}
      result_valid = MapSystemAPIController.show(conn, params_valid)
      # Can return error tuple if system not found (which is expected in unit test)
      case result_valid do
        %Plug.Conn{} -> assert result_valid.status in [200, 404, 500]
        # Expected in unit test without real data
        {:error, :not_found} -> :ok
        # Other errors are acceptable in unit tests
        {:error, _} -> :ok
      end

      # Test with invalid system ID
      params_invalid = %{"id" => "invalid"}
      result_invalid = MapSystemAPIController.show(conn, params_invalid)

      case result_invalid do
        %Plug.Conn{} -> assert result_invalid.status in [400, 404, 500]
        # Expected for invalid parameters
        {:error, _} -> :ok
      end
    end

    test "create handles single system creation" do
      map_id = Ecto.UUID.generate()
      char_id = "123456789"
      conn = build_conn() |> assign(:map_id, map_id) |> assign(:owner_character_id, char_id)

      # Test with valid single system parameters
      params_valid = %{
        "solar_system_id" => 30_000_142,
        "position_x" => 100,
        "position_y" => 200
      }

      result_valid = MapSystemAPIController.create(conn, params_valid)
      # Can return error tuple if missing required context (expected in unit test)
      case result_valid do
        %Plug.Conn{} -> assert result_valid.status in [200, 400, 500]
        # Expected in unit test without full context
        {:error, :missing_params} -> :ok
        # Other errors are acceptable in unit tests
        {:error, _} -> :ok
      end

      # Test with missing position parameters
      params_missing_pos = %{
        "solar_system_id" => 30_000_142
      }

      result_missing = MapSystemAPIController.create(conn, params_missing_pos)

      case result_missing do
        %Plug.Conn{} ->
          assert result_missing.status in [400, 422, 500]

          if result_missing.status == 400 do
            response = json_response(result_missing, 400)
            assert Map.has_key?(response, "error")
          end

        {:error, _} ->
          # Error tuples are acceptable in unit tests
          :ok
      end
    end

    test "create handles batch operations" do
      map_id = Ecto.UUID.generate()
      char_id = "123456789"
      conn = build_conn() |> assign(:map_id, map_id) |> assign(:owner_character_id, char_id)

      # Test with valid batch parameters
      params_batch = %{
        "systems" => [
          %{
            "solar_system_id" => 30_000_142,
            "position_x" => 100,
            "position_y" => 200
          }
        ],
        "connections" => [
          %{
            "solar_system_source" => 30_000_142,
            "solar_system_target" => 30_000_143
          }
        ]
      }

      result_batch = MapSystemAPIController.create(conn, params_batch)
      assert_controller_result(result_batch)

      # Test with empty arrays
      params_empty = %{
        "systems" => [],
        "connections" => []
      }

      result_empty = MapSystemAPIController.create(conn, params_empty)

      case result_empty do
        %Plug.Conn{} -> assert result_empty.status in [200, 400, 500]
        # Error tuples are acceptable in unit tests
        {:error, _} -> :ok
      end
    end

    test "create validates array parameters for batch" do
      map_id = Ecto.UUID.generate()
      char_id = "123456789"
      conn = build_conn() |> assign(:map_id, map_id) |> assign(:owner_character_id, char_id)

      # Test with invalid systems parameter (not array)
      params_invalid_systems = %{
        "systems" => "not_an_array",
        "connections" => []
      }

      result_invalid_systems = MapSystemAPIController.create(conn, params_invalid_systems)

      case result_invalid_systems do
        %Plug.Conn{} ->
          assert result_invalid_systems.status in [400, 422, 500]

          if result_invalid_systems.status == 400 do
            response = json_response(result_invalid_systems, 400)
            assert is_binary(response["error"])
          end

        {:error, _} ->
          # Error tuples are acceptable in unit tests
          :ok
      end

      # Test with invalid connections parameter (not array)
      params_invalid_connections = %{
        "systems" => [],
        "connections" => "not_an_array"
      }

      result_invalid_connections = MapSystemAPIController.create(conn, params_invalid_connections)

      case result_invalid_connections do
        %Plug.Conn{} ->
          assert result_invalid_connections.status in [400, 422, 500]

          if result_invalid_connections.status == 400 do
            response = json_response(result_invalid_connections, 400)
            assert is_binary(response["error"])
          end

        {:error, _} ->
          # Error tuples are acceptable in unit tests
          :ok
      end
    end

    test "create handles malformed single system requests" do
      map_id = Ecto.UUID.generate()
      char_id = "123456789"
      conn = build_conn() |> assign(:map_id, map_id) |> assign(:owner_character_id, char_id)

      # Test with position parameters but no solar_system_id
      params_malformed = %{
        "position_x" => 100,
        "position_y" => 200
      }

      result_malformed = MapSystemAPIController.create(conn, params_malformed)

      case result_malformed do
        %Plug.Conn{} ->
          assert result_malformed.status in [400, 422, 500]

          if result_malformed.status == 400 do
            response = json_response(result_malformed, 400)
            assert is_binary(response["error"])
          end

        {:error, _} ->
          # Error tuples are acceptable in unit tests
          :ok
      end
    end

    test "update validates system ID and parameters" do
      map_id = Ecto.UUID.generate()
      char_id = "123456789"
      conn = build_conn() |> assign(:map_id, map_id) |> assign(:owner_character_id, char_id)

      # Test with valid system ID
      params_valid = %{"id" => "30000142", "position_x" => 150}
      result_valid = MapSystemAPIController.update(conn, params_valid)
      assert_controller_result(result_valid)

      # Test with invalid system ID
      params_invalid = %{"id" => "invalid", "position_x" => 150}
      result_invalid = MapSystemAPIController.update(conn, params_invalid)
      assert_controller_result(result_invalid)
    end

    test "delete handles batch deletion" do
      map_id = Ecto.UUID.generate()
      conn = build_conn() |> assign(:map_id, map_id)

      # Test with system and connection IDs
      params = %{
        "system_ids" => [30_000_142, 30_000_143],
        "connection_ids" => [Ecto.UUID.generate()]
      }

      result = MapSystemAPIController.delete(conn, params)

      case result do
        %Plug.Conn{} ->
          if result.status == 200 do
            response = json_response(result, 200)
            assert Map.has_key?(response, "data")
            assert Map.has_key?(response["data"], "deleted_count")
          end

        {:error, _} ->
          # Error tuples are acceptable in unit tests
          :ok
      end
    end

    test "delete_single handles individual system deletion" do
      map_id = Ecto.UUID.generate()
      conn = build_conn() |> assign(:map_id, map_id)

      # Test with valid system ID
      params_valid = %{"id" => "30000142"}
      result_valid = MapSystemAPIController.delete_single(conn, params_valid)
      assert_controller_result(result_valid)

      # Test with invalid system ID
      params_invalid = %{"id" => "invalid"}
      result_invalid = MapSystemAPIController.delete_single(conn, params_invalid)
      assert_controller_result(result_invalid)
    end
  end

  describe "parameter parsing and edge cases" do
    test "create_single_system handles invalid solar_system_id" do
      map_id = Ecto.UUID.generate()
      char_id = "123456789"
      base_conn = build_conn() |> assign(:map_id, map_id) |> assign(:owner_character_id, char_id)

      # Test invalid solar_system_id formats
      invalid_system_ids = ["invalid", "", nil, -1]

      Enum.each(invalid_system_ids, fn solar_system_id ->
        params = %{
          "solar_system_id" => solar_system_id,
          "position_x" => 100,
          "position_y" => 200
        }

        result = MapSystemAPIController.create(base_conn, params)

        case result do
          %Plug.Conn{} ->
            # Should handle invalid IDs gracefully
            assert result.status in [400, 422, 500]

          {:error, _} ->
            # Error tuples are acceptable in unit tests
            :ok
        end
      end)
    end

    test "handles different parameter combinations for batch create" do
      map_id = Ecto.UUID.generate()
      char_id = "123456789"
      conn = build_conn() |> assign(:map_id, map_id) |> assign(:owner_character_id, char_id)

      # Test various parameter combinations
      param_combinations = [
        %{"systems" => [], "connections" => []},
        %{
          "systems" => [
            %{"solar_system_id" => 30_000_142, "position_x" => 100, "position_y" => 200}
          ]
        },
        %{
          "connections" => [
            %{"solar_system_source" => 30_000_142, "solar_system_target" => 30_000_143}
          ]
        },
        # Empty parameters
        %{},
        # Unexpected field
        %{"other_field" => "value"}
      ]

      Enum.each(param_combinations, fn params ->
        result = MapSystemAPIController.create(conn, params)
        assert_controller_result(result)
      end)
    end

    test "delete handles empty and invalid arrays" do
      map_id = Ecto.UUID.generate()
      conn = build_conn() |> assign(:map_id, map_id)

      # Test with empty arrays
      params_empty = %{
        "system_ids" => [],
        "connection_ids" => []
      }

      result_empty = MapSystemAPIController.delete(conn, params_empty)
      assert_controller_result(result_empty)

      # Test with missing fields
      params_missing = %{}
      result_missing = MapSystemAPIController.delete(conn, params_missing)
      assert_controller_result(result_missing)

      # Test with malformed IDs
      params_malformed = %{
        "system_ids" => ["invalid", "", nil],
        "connection_ids" => ["invalid-uuid", ""]
      }

      result_malformed = MapSystemAPIController.delete(conn, params_malformed)
      assert_controller_result(result_malformed)
    end

    test "update extracts parameters correctly" do
      map_id = Ecto.UUID.generate()
      char_id = "123456789"
      conn = build_conn() |> assign(:map_id, map_id) |> assign(:owner_character_id, char_id)

      # Test with various update parameters
      update_param_combinations = [
        %{"id" => "30000142", "position_x" => 100},
        %{"id" => "30000142", "position_y" => 200},
        %{"id" => "30000142", "status" => 1},
        %{"id" => "30000142", "visible" => true},
        %{"id" => "30000142", "description" => "test"},
        %{"id" => "30000142", "tag" => "test-tag"},
        %{"id" => "30000142", "locked" => false},
        %{"id" => "30000142", "temporary_name" => "temp"},
        %{"id" => "30000142", "labels" => "label1,label2"},
        # No update fields
        %{"id" => "30000142"}
      ]

      Enum.each(update_param_combinations, fn params ->
        result = MapSystemAPIController.update(conn, params)
        assert_controller_result(result)
      end)
    end

    test "handles missing assigns gracefully" do
      conn = build_conn()

      # Should fail due to missing map_id assign
      assert_raise(FunctionClauseError, fn ->
        MapSystemAPIController.index(conn, %{})
      end)

      assert_raise(FunctionClauseError, fn ->
        MapSystemAPIController.show(conn, %{"id" => "30000142"})
      end)
    end
  end

  describe "error handling scenarios" do
    test "create handles various error conditions" do
      map_id = Ecto.UUID.generate()
      char_id = "123456789"
      conn = build_conn() |> assign(:map_id, map_id) |> assign(:owner_character_id, char_id)

      # Test malformed single system requests
      malformed_single_params = [
        %{"solar_system_id" => "invalid", "position_x" => 100, "position_y" => 200},
        %{"solar_system_id" => nil, "position_x" => 100, "position_y" => 200},
        %{"solar_system_id" => "", "position_x" => 100, "position_y" => 200}
      ]

      Enum.each(malformed_single_params, fn params ->
        result = MapSystemAPIController.create(conn, params)

        case result do
          %Plug.Conn{} ->
            assert result.status in [400, 422, 500]

          {:error, _} ->
            # Error tuples are acceptable in unit tests
            :ok
        end
      end)
    end

    test "delete_system_id and delete_connection_id helper functions" do
      # These are tested indirectly through the delete function
      map_id = Ecto.UUID.generate()
      conn = build_conn() |> assign(:map_id, map_id)

      # Test with various ID formats
      test_ids = [
        # Valid integer ID
        30_000_142,
        # Valid string ID
        "30000142",
        # Invalid string
        "invalid",
        # Empty string
        "",
        # Nil value
        nil
      ]

      Enum.each(test_ids, fn id ->
        params = %{
          "system_ids" => [id],
          "connection_ids" => []
        }

        result = MapSystemAPIController.delete(conn, params)
        assert_controller_result(result)
      end)
    end

    test "handles invalid update parameters" do
      map_id = Ecto.UUID.generate()
      char_id = "123456789"
      conn = build_conn() |> assign(:map_id, map_id) |> assign(:owner_character_id, char_id)

      # Test with various invalid parameters
      invalid_updates = [
        %{"id" => "", "position_x" => 100},
        %{"id" => nil, "position_x" => 100},
        %{"id" => "invalid", "position_x" => "invalid"},
        %{"id" => "30000142", "status" => "invalid"},
        %{"id" => "30000142", "visible" => "invalid"}
      ]

      Enum.each(invalid_updates, fn params ->
        result = MapSystemAPIController.update(conn, params)
        assert_controller_result(result)
      end)
    end

    test "delete_single handles various error conditions" do
      map_id = Ecto.UUID.generate()
      conn = build_conn() |> assign(:map_id, map_id)

      # Test with various system ID formats
      system_id_formats = [
        # Valid
        "30000142",
        # Invalid string
        "invalid",
        # Empty
        "",
        # Nil
        nil,
        # Negative
        "-1",
        # Zero
        "0"
      ]

      Enum.each(system_id_formats, fn id ->
        params = %{"id" => id}
        result = MapSystemAPIController.delete_single(conn, params)
        assert_controller_result(result)
      end)
    end
  end

  describe "response structure validation" do
    test "index returns consistent response structure" do
      map_id = Ecto.UUID.generate()
      conn = build_conn() |> assign(:map_id, map_id)

      result = MapSystemAPIController.index(conn, %{})
      assert_controller_result(result)

      if result.status == 200 do
        response = json_response(result, 200)
        assert Map.has_key?(response, "data")
        assert is_map(response["data"])
        assert Map.has_key?(response["data"], "systems")
        assert Map.has_key?(response["data"], "connections")
        assert is_list(response["data"]["systems"])
        assert is_list(response["data"]["connections"])
      end
    end

    test "show returns proper response structure" do
      map_id = Ecto.UUID.generate()
      conn = build_conn() |> assign(:map_id, map_id)

      result = MapSystemAPIController.show(conn, %{"id" => "30000142"})

      case result do
        %Plug.Conn{} ->
          # Should have JSON response
          assert result.resp_body != ""

        {:error, _} ->
          # Error tuples are acceptable in unit tests
          :ok
      end
    end

    test "create returns proper response structures" do
      map_id = Ecto.UUID.generate()
      char_id = "123456789"
      conn = build_conn() |> assign(:map_id, map_id) |> assign(:owner_character_id, char_id)

      # Test single system creation response
      params_single = %{
        "solar_system_id" => 30_000_142,
        "position_x" => 100,
        "position_y" => 200
      }

      result_single = MapSystemAPIController.create(conn, params_single)

      case result_single do
        %Plug.Conn{} ->
          assert result_single.resp_body != ""

        {:error, _} ->
          # Error tuples are acceptable in unit tests
          :ok
      end

      # Test batch operation response
      params_batch = %{
        "systems" => [],
        "connections" => []
      }

      result_batch = MapSystemAPIController.create(conn, params_batch)

      case result_batch do
        %Plug.Conn{} ->
          assert result_batch.resp_body != ""

        {:error, _} ->
          # Error tuples are acceptable in unit tests
          :ok
      end
    end

    test "update returns proper response structure" do
      map_id = Ecto.UUID.generate()
      char_id = "123456789"
      conn = build_conn() |> assign(:map_id, map_id) |> assign(:owner_character_id, char_id)

      result = MapSystemAPIController.update(conn, %{"id" => "30000142", "position_x" => 150})

      case result do
        %Plug.Conn{} ->
          assert result.resp_body != ""

        {:error, _} ->
          # Error tuples are acceptable in unit tests
          :ok
      end
    end

    test "delete returns proper response structure" do
      map_id = Ecto.UUID.generate()
      conn = build_conn() |> assign(:map_id, map_id)

      result = MapSystemAPIController.delete(conn, %{"system_ids" => [], "connection_ids" => []})
      assert_controller_result(result)

      if result.status == 200 do
        response = json_response(result, 200)
        assert Map.has_key?(response, "data")
        assert Map.has_key?(response["data"], "deleted_count")
        assert is_integer(response["data"]["deleted_count"])
      end
    end

    test "delete_single returns proper response structure" do
      map_id = Ecto.UUID.generate()
      conn = build_conn() |> assign(:map_id, map_id)

      result = MapSystemAPIController.delete_single(conn, %{"id" => "30000142"})

      case result do
        %Plug.Conn{} ->
          # Should have JSON response
          assert result.resp_body != ""
          response = Jason.decode!(result.resp_body)
          assert Map.has_key?(response, "data")
          assert Map.has_key?(response["data"], "deleted")

        {:error, _} ->
          # Error tuples are acceptable in unit tests
          :ok
      end
    end

    test "error responses have consistent structure" do
      map_id = Ecto.UUID.generate()
      char_id = "123456789"
      conn = build_conn() |> assign(:map_id, map_id) |> assign(:owner_character_id, char_id)

      # Test error response from create
      params_error = %{
        "solar_system_id" => 30_000_142
        # Missing position_x and position_y
      }

      result_error = MapSystemAPIController.create(conn, params_error)

      case result_error do
        %Plug.Conn{} ->
          assert result_error.status in [400, 422, 500]

          if result_error.status == 400 do
            response = json_response(result_error, 400)
            assert Map.has_key?(response, "error")
            assert is_binary(response["error"])
          end

        {:error, _} ->
          # Error tuples are acceptable in unit tests
          :ok
      end
    end
  end

  describe "legacy endpoint compatibility" do
    test "list_systems delegates to index" do
      map_id = Ecto.UUID.generate()
      conn = build_conn() |> assign(:map_id, map_id)

      # The list_systems function delegates to index, so it should behave the same
      result = MapSystemAPIController.list_systems(conn, %{})

      case result do
        %Plug.Conn{} ->
          assert result.status in [200, 500]

        {:error, _} ->
          # Error tuples are acceptable in unit tests
          :ok
      end
    end
  end
end
