//
//  main.cpp
//  projectM-sdl
//
//  Created by Mischa Spiegelmock on 6/3/15.
//
//  This is an implementation of projectM using libSDL2

#include "pmSDL.hpp"

#define OGL_DEBUG	0
#define UNLOCK_FPS	0
#define FAKE_AUDIO	0

#if OGL_DEBUG
void DebugLog(GLenum source,
               GLenum type,
               GLuint id,
               GLenum severity,
               GLsizei length,
               const GLchar* message,
               const void* userParam) {

    /*if (type != GL_DEBUG_TYPE_OTHER)*/ 
	{
        std::cerr << " -- \n" << "Type: " <<
           type << "; Source: " <<
           source <<"; ID: " << id << "; Severity: " <<
           severity << "\n" << message << "\n";
       }
 }
#endif

// return path to config file to use
std::string getConfigFilePath() {
    const char *path = DATADIR_PATH;
    struct stat sb;
    
    // check if datadir exists.
    // it should exist if this application was installed. if not, assume we're developing it and use currect directory
    if (stat(path, &sb) != 0) {
        SDL_LogWarn(SDL_LOG_CATEGORY_ERROR, "Could not open datadir path %s.\n", DATADIR_PATH);
    }
    
    std::string configFilePath = path;
    configFilePath += "/config.inp";
    
    // check if config file exists
    if (stat(configFilePath.c_str(), &sb) != 0) {
        SDL_LogWarn(SDL_LOG_CATEGORY_ERROR, "No config file %s found. Using development settings.\n", configFilePath.c_str());
        return "";
    }
    
    return configFilePath;
}

int main(int argc, char *argv[]) {

#if UNLOCK_FPS
    setenv("vblank_mode", "0", 1);
#endif

    SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO);

    if (! SDL_VERSION_ATLEAST(2, 0, 5)) {
        SDL_Log("SDL version 2.0.5 or greater is required. You have %i.%i.%i", SDL_MAJOR_VERSION, SDL_MINOR_VERSION, SDL_PATCHLEVEL);
        return 1;
    }

    // default window size to usable bounds (e.g. minus menubar and dock)
    SDL_Rect initialWindowBounds;
#if SDL_VERSION_ATLEAST(2, 0, 5)
    // new and better
    SDL_GetDisplayUsableBounds(0, &initialWindowBounds);
#else
    SDL_GetDisplayBounds(0, &initialWindowBounds);
#endif
    int width = initialWindowBounds.w;
    int height = initialWindowBounds.h;
    int renderIndex = 0;

#ifdef USE_GLES
    for(int i = 0; i < SDL_GetNumRenderDrivers(); i++) {
        SDL_RendererInfo info;
        if (SDL_GetRenderDriverInfo(i, &info) == 0) {
            if (std::string(info.name) == "opengles2") {
				renderIndex = i;
				break;
			}
        }
    }
    // use GLES 2.0 (this may need adjusting)
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);

#else
	// Disabling compatibility profile
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);

#endif
    
    SDL_Window *win = SDL_CreateWindow("projectM", 0, 0, width, height, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
    SDL_GLContext glCtx = SDL_GL_CreateContext(win);


    SDL_Log("GL_VERSION: %s", glGetString(GL_VERSION));
    SDL_Log("GL_SHADING_LANGUAGE_VERSION: %s", glGetString(GL_SHADING_LANGUAGE_VERSION));
    SDL_Log("GL_VENDOR: %s", glGetString(GL_VENDOR));

    SDL_SetWindowTitle(win, "projectM Visualizer");
    
    projectMSDL *app;
    
    // load configuration file
    std::string configFilePath = getConfigFilePath();
    
    if (! configFilePath.empty()) {
        // found config file, use it
        app = new projectMSDL(configFilePath, 0);
        SDL_Log("Using config from %s", configFilePath.c_str());
    } else {
        SDL_Log("Config file not found, using development settings");
        float heightWidthRatio = (float)height / (float)width;
        projectM::Settings settings;
        settings.windowWidth = width;
        settings.windowHeight = height;
        settings.meshX = 300;
        settings.meshY = settings.meshX * heightWidthRatio;
        settings.fps   = 60;
        settings.smoothPresetDuration = 3; // seconds
        settings.presetDuration = 7; // seconds
        settings.beatSensitivity = 0.8;
        settings.aspectCorrection = 1;
        settings.shuffleEnabled = 1;
        settings.softCutRatingsEnabled = 1; // ???
        // get path to our app, use CWD for presets/fonts/etc
        std::string base_path = SDL_GetBasePath();
        settings.presetURL = base_path + "presets";
//        settings.presetURL = base_path + "presets/presets_shader_test";
        settings.menuFontURL = base_path + "fonts/Vera.ttf";
        settings.titleFontURL = base_path + "fonts/Vera.ttf";
        // init with settings
        app = new projectMSDL(settings, 0);
    }
    app->init(win, &glCtx);

#if OGL_DEBUG
    glEnable(GL_DEBUG_OUTPUT);
    glEnable(GL_DEBUG_OUTPUT_SYNCHRONOUS);
    glDebugMessageCallback(DebugLog, NULL);
#endif

#if !FAKE_AUDIO
    // get an audio input device
    if (app->openAudioInput())
	    app->beginAudioCapture();
#endif


#if UNLOCK_FPS
    int32_t frame_count = 0;
    struct timespec now;
    clock_gettime(CLOCK_MONOTONIC_RAW, &now);
    int64_t start = ( ((int64_t)now.tv_sec * 1000L) + (now.tv_nsec / 1000000L) );
#endif

    // standard main loop
    int fps = app->settings().fps;
    printf("fps: %d\n", fps);
    if (fps <= 0)
        fps = 60;
    const Uint32 frame_delay = 1000/fps;
    Uint32 last_time = SDL_GetTicks();
    while (! app->done) {
        app->renderFrame();
#if FAKE_AUDIO
        app->addFakePCM();
#endif

#if UNLOCK_FPS
        frame_count++;
        clock_gettime(CLOCK_MONOTONIC_RAW, &now);
        if (( ((int64_t)now.tv_sec * 1000L) + (now.tv_nsec / 1000000L) ) - start > 5000) {
            SDL_GL_DeleteContext(glCtx);
            delete(app);
            fprintf(stdout, "Frames[%d]\n", frame_count);
            exit(0);
        }
#else
        app->pollEvent();
        Uint32 elapsed = SDL_GetTicks() - last_time;
        if (elapsed < frame_delay)
            SDL_Delay(frame_delay - elapsed);
        last_time = SDL_GetTicks();
#endif
    }
    
    SDL_GL_DeleteContext(glCtx);
#if !FAKE_AUDIO
    app->endAudioCapture();
#endif
    delete app;

    return PROJECTM_SUCCESS;
}