/*
    Copyright (c) 2005-2022 Intel Corporation

    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.
*/

#include <cassert>
#include <stdio.h>

#include "video.hpp"

unsigned int *g_pImg = nullptr;
int g_sizex, g_sizey;
static video *g_video = nullptr;
static int g_fps = 0;

#if _WIN32 || _WIN64

static DWORD g_msec = 0;

#ifdef _WINDOWS
HINSTANCE video::win_hInstance = 0;
int video::win_iCmdShow = 0;
void video::win_set_class(WNDCLASSEX &wcex) {}
void video::win_load_accelerators(int idc) {}
#endif //_WINDOWS

#else
#include <sched.h>
#include <sys/time.h>
struct timeval g_time;
#endif //_WIN32||_WIN64

#define CALC_FPS_ENABLED ((WINAPI_FAMILY != WINAPI_FAMILY_APP) && (!__ANDROID__))

video::video()
        // OpenGL* RGBA byte order for little-endian CPU
        : depth(24),
          red_shift(0),
          green_shift(8),
          blue_shift(16),
          red_mask(0xff),
          green_mask(0xff00),
          blue_mask(0xff0000) {
    assert(g_video == nullptr);
    g_video = this;
    title = "Video";
    updating = calc_fps = false;
}

bool video::init_window(int x, int y) {
    g_sizex = x;
    g_sizey = y;
    g_pImg = new unsigned int[x * y];
    running = true;
    return false;
}

bool video::init_console() {
    running = true;
    return true;
}

void video::terminate() {
#if CALC_FPS_ENABLED
    if (calc_fps) {
        double fps = g_fps;
#if _WIN32 || _WIN64
        fps /= (GetTickCount() - g_msec) / 1000.0;
#else
        struct timezone tz;
        struct timeval end_time;
        gettimeofday(&end_time, &tz);
        fps /= (end_time.tv_sec + 1.0 * end_time.tv_usec / 1000000.0) -
               (g_time.tv_sec + 1.0 * g_time.tv_usec / 1000000.0);
#endif
        printf("%s: %.1f fps\n", title, fps);
    }
#endif
    g_video = nullptr;
    running = false;

    delete[] g_pImg;
    g_pImg = nullptr;
}

video::~video() {
    if (g_video)
        terminate();
}

//! Count and display FPS count in titlebar
bool video::next_frame() {
#if CALC_FPS_ENABLED
    if (calc_fps) {
        if (!g_fps) {
#if _WIN32 || _WIN64
            g_msec = GetTickCount();
#else
            struct timezone tz;
            gettimeofday(&g_time, &tz);
#endif
        }
        g_fps++;
    }
#endif
    return running;
}

//! Do standard loop
void video::main_loop() {
    on_process();
}

//! Change window title
void video::show_title() {}

///////////////////////////////////////////// public methods of video class ///////////////////////

drawing_area::drawing_area(int x, int y, int sizex, int sizey)
        : base_index(y * g_sizex + x),
          max_index(g_sizex * g_sizey),
          index_stride(g_sizex),
          pixel_depth(24),
          ptr32(g_pImg),
          start_x(x),
          start_y(y),
          size_x(sizex),
          size_y(sizey) {
    assert(x < g_sizex);
    assert(y < g_sizey);
    assert(x + sizex <= g_sizex);
    assert(y + sizey <= g_sizey);

    index = base_index; // current index
}

void drawing_area::update() {}
