crossdesk/src/device_controller/device_controller.h

/*
 * @Author: DI JUNKUN
 * @Date: 2023-12-14
 * Copyright (c) 2023 by DI JUNKUN, All Rights Reserved.
 */

#ifndef _DEVICE_CONTROLLER_H_
#define _DEVICE_CONTROLLER_H_

#include <stdio.h>

#include <nlohmann/json.hpp>
#include <string>

#include "display_info.h"
using json = nlohmann::json;

namespace crossdesk {

typedef enum {
  mouse = 0,
  keyboard,
  audio_capture,
  host_infomation,
  display_id,
} ControlType;
typedef enum {
  move = 0,
  left_down,
  left_up,
  right_down,
  right_up,
  middle_down,
  middle_up,
  wheel_vertical,
  wheel_horizontal
} MouseFlag;
typedef enum { key_down = 0, key_up } KeyFlag;
typedef struct {
  float x;
  float y;
  int s;
  MouseFlag flag;
} Mouse;

typedef struct {
  size_t key_value;
  KeyFlag flag;
} Key;

typedef struct {
  char host_name[64];
  size_t host_name_size;
  char** display_list;
  size_t display_num;
  int* left;
  int* top;
  int* right;
  int* bottom;
} HostInfo;

struct RemoteAction {
  ControlType type;
  union {
    Mouse m;
    Key k;
    HostInfo i;
    bool a;
    int d;
  };

  // parse
  std::string to_json() const { return ToJson(*this); }

  bool from_json(const std::string& json_str) {
    RemoteAction temp;
    if (!FromJson(json_str, temp)) return false;
    *this = temp;
    return true;
  }

  static std::string ToJson(const RemoteAction& a) {
    json j;
    j["type"] = a.type;
    switch (a.type) {
      case ControlType::mouse:
        j["mouse"] = {
            {"x", a.m.x}, {"y", a.m.y}, {"s", a.m.s}, {"flag", a.m.flag}};
        break;
      case ControlType::keyboard:
        j["keyboard"] = {{"key_value", a.k.key_value}, {"flag", a.k.flag}};
        break;
      case ControlType::audio_capture:
        j["audio_capture"] = a.a;
        break;
      case ControlType::display_id:
        j["display_id"] = a.d;
        break;
      case ControlType::host_infomation: {
        json displays = json::array();
        for (size_t idx = 0; idx < a.i.display_num; idx++) {
          displays.push_back(
              {{"name", a.i.display_list ? a.i.display_list[idx] : ""},
               {"left", a.i.left ? a.i.left[idx] : 0},
               {"top", a.i.top ? a.i.top[idx] : 0},
               {"right", a.i.right ? a.i.right[idx] : 0},
               {"bottom", a.i.bottom ? a.i.bottom[idx] : 0}});
        }

        j["host_info"] = {{"host_name", a.i.host_name},
                          {"display_num", a.i.display_num},
                          {"displays", displays}};
        break;
      }
    }
    return j.dump();
  }

  static bool FromJson(const std::string& json_str, RemoteAction& out) {
    try {
      json j = json::parse(json_str);
      out.type = (ControlType)j.at("type").get<int>();
      switch (out.type) {
        case ControlType::mouse:
          out.m.x = j.at("mouse").at("x").get<float>();
          out.m.y = j.at("mouse").at("y").get<float>();
          out.m.s = j.at("mouse").at("s").get<int>();
          out.m.flag = (MouseFlag)j.at("mouse").at("flag").get<int>();
          break;
        case ControlType::keyboard:
          out.k.key_value = j.at("keyboard").at("key_value").get<size_t>();
          out.k.flag = (KeyFlag)j.at("keyboard").at("flag").get<int>();
          break;
        case ControlType::audio_capture:
          out.a = j.at("audio_capture").get<bool>();
          break;
        case ControlType::display_id:
          out.d = j.at("display_id").get<int>();
          break;
        case ControlType::host_infomation: {
          std::string host_name =
              j.at("host_info").at("host_name").get<std::string>();
          strncpy(out.i.host_name, host_name.c_str(), sizeof(out.i.host_name));
          out.i.host_name[sizeof(out.i.host_name) - 1] = '\0';
          out.i.host_name_size = host_name.size();

          out.i.display_num = j.at("host_info").at("display_num").get<size_t>();
          auto displays = j.at("host_info").at("displays");

          out.i.display_list =
              (char**)malloc(out.i.display_num * sizeof(char*));
          out.i.left = (int*)malloc(out.i.display_num * sizeof(int));
          out.i.top = (int*)malloc(out.i.display_num * sizeof(int));
          out.i.right = (int*)malloc(out.i.display_num * sizeof(int));
          out.i.bottom = (int*)malloc(out.i.display_num * sizeof(int));

          for (size_t idx = 0; idx < out.i.display_num; idx++) {
            std::string name = displays[idx].at("name").get<std::string>();
            out.i.display_list[idx] = (char*)malloc(name.size() + 1);
            strcpy(out.i.display_list[idx], name.c_str());
            out.i.left[idx] = displays[idx].at("left").get<int>();
            out.i.top[idx] = displays[idx].at("top").get<int>();
            out.i.right[idx] = displays[idx].at("right").get<int>();
            out.i.bottom[idx] = displays[idx].at("bottom").get<int>();
          }
          break;
        }
      }
      return true;
    } catch (const std::exception& e) {
      printf("Failed to parse RemoteAction JSON: %s\n", e.what());
      return false;
    }
  }
};

// int key_code, bool is_down
typedef void (*OnKeyAction)(int, bool, void*);

class DeviceController {
 public:
  virtual ~DeviceController() {}

 public:
  // virtual int Init(int screen_width, int screen_height);
  // virtual int Destroy();
  // virtual int SendMouseCommand(RemoteAction remote_action);

  // virtual int Hook();
  // virtual int Unhook();
};
}  // namespace crossdesk
#endif