/*
 * Copyright 2024 Joel Winarske
 *
 * 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 <waypp/waypp.h>

#include "output.h"

class XdgOutput {
 public:
  XdgOutput(zxdg_output_manager_v1* zxdg_output_manager_v1,
            wl_output* wl_output);

  ~XdgOutput();

  [[nodiscard]] int get_logical_position_x() const {
    return output_.logical_position.x;
  }

  [[nodiscard]] int get_logical_position_y() const {
    return output_.logical_position.y;
  }

  [[nodiscard]] int get_logical_size_width() const {
    return output_.logical_size.width;
  }

  [[nodiscard]] int get_logical_size_height() const {
    return output_.logical_size.height;
  }

  [[nodiscard]] const std::string& get_name() const { return output_.name; }

  [[nodiscard]] const std::string& get_description() const {
    return output_.description;
  }

  [[nodiscard]] bool is_origin() const {
    return (output_.logical_position.x == 0 && output_.logical_position.y == 0);
  }

  void print() const;

  // Disallow copy and assign.
  XdgOutput(const XdgOutput&) = delete;

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

 private:
#if HAS_WAYLAND_PROTOCOL_XDG_OUTPUT_UNSTABLE_V1
  struct zxdg_output_v1* zxdg_output_v1_;
#endif

  struct {
    struct {
      int x;
      int y;
    } logical_position;

    struct {
      int width;
      int height;
    } logical_size;

    std::string name;
    std::string description;

    bool done;

  } output_;

  /**
   * position of the output within the global compositor space
   *
   * The position event describes the location of the wl_output
   * within the global compositor space.
   *
   * The logical_position event is sent after creating an xdg_output
   * (see xdg_output_manager.get_xdg_output) and whenever the
   * location of the output changes within the global compositor
   * space.
   * @param x x position within the global compositor space
   * @param y y position within the global compositor space
   */
  static void handle_logical_position(void* data,
                                      struct zxdg_output_v1* zxdg_output_v1,
                                      int32_t x,
                                      int32_t y);

  /**
   * size of the output in the global compositor space
   *
   * The logical_size event describes the size of the output in the
   * global compositor space.
   *
   * Most regular Wayland clients should not pay attention to the
   * logical size and would rather rely on xdg_shell interfaces.
   *
   * Some clients such as Xwayland, however, need this to configure
   * their surfaces in the global compositor space as the compositor
   * may apply a different scale from what is advertised by the
   * output scaling property (to achieve fractional scaling, for
   * example).
   *
   * For example, for a wl_output mode 3840×2160 and a scale factor
   * 2:
   *
   * - A compositor not scaling the monitor viewport in its
   * compositing space will advertise a logical size of 3840×2160,
   *
   * - A compositor scaling the monitor viewport with scale factor 2
   * will advertise a logical size of 1920×1080,
   *
   * - A compositor scaling the monitor viewport using a fractional
   * scale of 1.5 will advertise a logical size of 2560×1440.
   *
   * For example, for a wl_output mode 1920×1080 and a 90 degree
   * rotation, the compositor will advertise a logical size of
   * 1080x1920.
   *
   * The logical_size event is sent after creating an xdg_output (see
   * xdg_output_manager.get_xdg_output) and whenever the logical size
   * of the output changes, either as a result of a change in the
   * applied scale or because of a change in the corresponding output
   * mode(see wl_output.mode) or transform (see wl_output.transform).
   * @param width width in global compositor space
   * @param height height in global compositor space
   */
  static void handle_logical_size(void* data,
                                  struct zxdg_output_v1* zxdg_output_v1,
                                  int32_t width,
                                  int32_t height);

  /**
   * all information about the output have been sent
   *
   * This event is sent after all other properties of an xdg_output
   * have been sent.
   *
   * This allows changes to the xdg_output properties to be seen as
   * atomic, even if they happen via multiple events.
   *
   * For objects version 3 onwards, this event is deprecated.
   * Compositors are not required to send it anymore and must send
   * wl_output.done instead.
   */
  static void handle_done(void* data, struct zxdg_output_v1* zxdg_output_v1);

  /**
   * name of this output
   *
   * Many compositors will assign names to their outputs, show them
   * to the user, allow them to be configured by name, etc. The
   * client may wish to know this name as well to offer the user
   * similar behaviors.
   *
   * The naming convention is compositor defined, but limited to
   * alphanumeric characters and dashes (-). Each name is unique
   * among all wl_output globals, but if a wl_output global is
   * destroyed the same name may be reused later. The names will also
   * remain consistent across sessions with the same hardware and
   * software configuration.
   *
   * Examples of names include 'HDMI-A-1', 'WL-1', 'X11-1', etc.
   * However, do not assume that the name is a reflection of an
   * underlying DRM connector, X11 connection, etc.
   *
   * The name event is sent after creating an xdg_output (see
   * xdg_output_manager.get_xdg_output). This event is only sent once
   * per xdg_output, and the name does not change over the lifetime
   * of the wl_output global.
   *
   * This event is deprecated, instead clients should use
   * wl_output.name. Compositors must still support this event.
   * @param name output name
   * @since 2
   */
  static void handle_name(void* data,
                          struct zxdg_output_v1* zxdg_output_v1,
                          const char* name);

  /**
   * human-readable description of this output
   *
   * Many compositors can produce human-readable descriptions of
   * their outputs. The client may wish to know this description as
   * well, to communicate the user for various purposes.
   *
   * The description is a UTF-8 string with no convention defined for
   * its contents. Examples might include 'Foocorp 11" Display' or
   * 'Virtual X11 output via :1'.
   *
   * The description event is sent after creating an xdg_output (see
   * xdg_output_manager.get_xdg_output) and whenever the description
   * changes. The description is optional, and may not be sent at
   * all.
   *
   * For objects of version 2 and lower, this event is only sent once
   * per xdg_output, and the description does not change over the
   * lifetime of the wl_output global.
   *
   * This event is deprecated, instead clients should use
   * wl_output.description. Compositors must still support this
   * event.
   * @param description output description
   * @since 2
   */
  static void handle_description(void* data,
                                 struct zxdg_output_v1* zxdg_output_v1,
                                 const char* description);

  static constexpr struct zxdg_output_v1_listener listener_ = {
      .logical_position = handle_logical_position,
      .logical_size = handle_logical_size,
      .done = handle_done,
      .name = handle_name,
      .description = handle_description,
  };
};
