/*
 * Copyright 2021-2022 Toyota Connected North America
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#pragma once

#include <memory>
#include <string>

#include <cassert>

#include "agl-shell-client-protocol.h"
#include "constants.h"

#include "backend/backend.h"
#include "ivi-application-client-protocol.h"
#include "ivi-wm-client-protocol.h"
#include "xdg-shell-client-protocol.h"

// workaround for Wayland macro not compiling in C++
#define WL_ARRAY_FOR_EACH(pos, array, type)                             \
  for (pos = (type)(array)->data;                                       \
       (const char*)pos < ((const char*)(array)->data + (array)->size); \
       (pos)++)

class Backend;

class Display;

class Engine;

class WaylandWindow {
 public:
  // a normal surface role is a regular application; a window_bg, window_panel
  // are part of the client shell UI for AGL; for window_panel only the height
  // has any meaning, while window_bg will literally be the entire output
  enum window_type {
    WINDOW_NORMAL,
    WINDOW_BG,
    WINDOW_PANEL_TOP,
    WINDOW_PANEL_BOTTOM,
    WINDOW_PANEL_LEFT,
    WINDOW_PANEL_RIGHT
  };

  WaylandWindow(size_t index,
                std::shared_ptr<Display> display,
                const std::string& type,
                wl_output* output,
                uint32_t output_index,
                std::string app_id,
                bool fullscreen,
                int32_t width,
                int32_t height,
                double pixel_ratio,
                uint32_t activation_area_x,
                uint32_t activation_area_y,
                Backend* backend,
                uint32_t ivi_surface_id);

  ~WaylandWindow();

  WaylandWindow(const WaylandWindow&) = delete;

  const WaylandWindow& operator=(const WaylandWindow&) = delete;

  /**
   * @brief Set Engine
   * @param[in] engine Engine
   * @return void
   * @relation
   * wayland
   */
  void SetEngine(const std::shared_ptr<Engine>& engine);

  /**
   * @brief Get Fps Counter
   * @return uint32_t
   * @retval Frames Per Second counter.
   * @relation
   * wayland
   */
  uint32_t GetFpsCounter();

  /**
   * @brief activate a system cursor
   * @param[in] device Device
   * @param[in] kind Kind of a cursor
   * @return bool
   * @retval true Success
   * @retval false Failure
   * @relation
   * platform
   */
  NODISCARD bool ActivateSystemCursor(int32_t device, const std::string& kind) const;

  /**
   * @brief Get Base Surface
   * @return wl_surface*
   * @retval Base surface
   * @relation
   * wayland
   */
  wl_surface* GetBaseSurface() { return m_base_surface; }

  uint32_t m_fps_counter{};

  /**
   * @brief Get window_type
   * @param[in] type Window type
   * @return window_type
   * @retval WINDOW_NORMAL
   * @retval WINDOW_BG
   * @retval WINDOW_PANEL_TOP
   * @retval WINDOW_PANEL_BOTTOM
   * @retval WINDOW_PANEL_LEFT
   * @retval WINDOW_PANEL_RIGHT
   * @relation
   * wayland, agl-shell
   */
  static window_type get_window_type(const std::string& type);

  /**
   * @brief GetSize
   * @retval std::pair<int32_t, int32_t> width, height
   * @relation
   * wayland
   */
  std::pair<int32_t, int32_t> GetSize() {
    return std::pair<int32_t, int32_t>{m_geometry.width, m_geometry.height};
  }

 private:
  size_t m_index;
  std::shared_ptr<Display> m_display;
  wl_output* m_wl_output;
  uint32_t m_output_index;
  std::shared_ptr<Engine> m_flutter_engine;
  double m_pixel_ratio;
  struct wl_surface* m_base_surface{};
  std::shared_ptr<Backend> m_backend;
  bool m_wait_for_configure{};

  uint32_t m_ivi_surface_id;
  bool m_fullscreen{};
  bool m_maximized{};
  MAYBE_UNUSED bool m_resize{};
  MAYBE_UNUSED bool m_activated{};
  MAYBE_UNUSED bool m_running{};
  struct {
    int32_t width;
    int32_t height;
  } m_geometry;
  struct {
    uint32_t x;
    uint32_t y;
  } m_activation_area;
  struct {
    int32_t width;
    int32_t height;
  } m_window_size{};

  enum window_type m_type;
  std::string m_app_id;

  struct xdg_surface* m_xdg_surface{};
  struct xdg_toplevel* m_xdg_toplevel{};
  static const struct xdg_surface_listener xdg_surface_listener;

  struct ivi_surface* m_ivi_surface{};
  static const struct ivi_surface_listener ivi_surface_listener;

  struct wl_callback* m_base_frame_callback{};

  static const struct wl_surface_listener m_base_surface_listener;

  /**
   * @brief Handle enter base surface event
   * @param[in,out] data Data of type Display
   * @param[in] surface No use
   * @param[in] output Output
   * @return void
   * @relation
   * wayland
   */
  static void handle_base_surface_enter(void* data,
                                        struct wl_surface* surface,
                                        struct wl_output* output);

  /**
   * @brief Handle leave base surface event
   * @param[in,out] data Data of type Display
   * @param[in] surface No use
   * @param[in] output Output
   * @return void
   * @relation
   * wayland
   */
  static void handle_base_surface_leave(void* data,
                                        struct wl_surface* surface,
                                        struct wl_output* output);

  /**
   * @brief Response to configure event
   * @param[in] data Pointer to WaylandWindow type
   * @param[in] xdg_surface Surfaces in the domain of xdg-shell
   * @param[in] serial Serial of the configure event
   * @return void
   * @relation
   * wayland
   */
  static void handle_xdg_surface_configure(void* data,
                                           struct xdg_surface* xdg_surface,
                                           uint32_t serial);

  static const struct xdg_toplevel_listener xdg_toplevel_listener;

  /**
   * @brief Response to configure event
   * @param[in] data Pointer to WaylandWindow type
   * @param[in] ivi_surface Surfaces in the domain of ivi-shell
   * @param[in] width width of the surface
   * @param[in] height height of the surface
   * @return void
   * @relation
   * wayland
   */
  static void handle_ivi_surface_configure(void* data,
                                           struct ivi_surface* ivi_surface,
                                           int32_t width,
                                           int32_t height);

  /**
   * @brief Response to configure event
   * @param[in] data Pointer to WaylandWindow type
   * @param[in] toplevel No use
   * @param[in] width Width
   * @param[in] height Height
   * @param[in] states Dynamic array for checking xdg_toplevel_state
   * @return void
   * @relation
   * wayland
   */
  static void handle_toplevel_configure(void* data,
                                        struct xdg_toplevel* toplevel,
                                        int32_t width,
                                        int32_t height,
                                        struct wl_array* states);

  /**
   * @brief Close event
   * @param[in] data Pointer to WaylandWindow type
   * @param[in] xdg_toplevel No use
   * @return void
   * @relation
   * wayland
   */
  static void handle_toplevel_close(void* data,
                                    struct xdg_toplevel* xdg_toplevel);

  /**
   * @brief handler for frame event of a base surface
   * @param[in] data Pointer to WaylandWindow type
   * @param[in] callback a callback for frame event
   * @param[in] time No use
   * @return void
   * @relation
   * wayland
   */
  static void on_frame_base_surface(void* data,
                                    struct wl_callback* callback,
                                    uint32_t time);

  static const struct wl_callback_listener m_base_surface_frame_listener;
};