#include <stdlib.h>

#ifdef TARGET_WEB
#include <emscripten.h>
#include <emscripten/html5.h>
#endif

#include "sm64.h"

#include "game/memory.h"
#include "audio/external.h"

#include "gfx/gfx_pc.h"
#include "gfx/gfx_opengl.h"
#include "gfx/gfx_sdl.h"

#include "audio/audio_api.h"
#include "audio/audio_sdl.h"
#include "audio/audio_null.h"

#include "pc_main.h"
#include "cliopts.h"
#include "configfile.h"
#include "controller/controller_api.h"

OSMesg D_80339BEC;
OSMesgQueue gSIEventMesgQueue;

s8 gResetTimer;
s8 D_8032C648;
s8 gDebugLevelSelect;
s8 gShowProfiler;
s8 gShowDebugText;

static struct AudioAPI *audio_api;
static struct GfxWindowManagerAPI *wm_api;
static struct GfxRenderingAPI *rendering_api;

extern void gfx_run(Gfx *commands);
extern void thread5_game_loop(void *arg);
extern void create_next_audio_buffer(s16 *samples, u32 num_samples);
void game_loop_one_iteration(void);

void dispatch_audio_sptask(struct SPTask *spTask) {
}

void set_vblank_handler(s32 index, struct VblankHandler *handler, OSMesgQueue *queue, OSMesg *msg) {
}

static bool inited = false;

#include "game/display.h" // for gGlobalTimer
void send_display_list(struct SPTask *spTask) {
    if (!inited) return;
    gfx_run((Gfx *)spTask->task.t.data_ptr);
}

#define printf

void produce_one_frame(void) {
    gfx_start_frame();
    game_loop_one_iteration();
    
    int samples_left = audio_api->buffered();
    u32 num_audio_samples = samples_left < audio_api->get_desired_buffered() ? 544 : 528;
    //printf("Audio samples: %d %u\n", samples_left, num_audio_samples);
    s16 audio_buffer[544 * 2 * 2];
    for (int i = 0; i < 2; i++) {
        /*if (audio_cnt-- == 0) {
            audio_cnt = 2;
        }
        u32 num_audio_samples = audio_cnt < 2 ? 528 : 544;*/
        create_next_audio_buffer(audio_buffer + i * (num_audio_samples * 2), num_audio_samples);
    }
    //printf("Audio samples before submitting: %d\n", audio_api->buffered());

    // scale by master volume (0-127)
    const s32 mod = (s32)configMasterVolume;
    for (u32 i = 0; i < num_audio_samples * 4; ++i)
        audio_buffer[i] = ((s32)audio_buffer[i] * mod) >> VOLUME_SHIFT;

    audio_api->play((u8*)audio_buffer, 2 * num_audio_samples * 4);
    
    gfx_end_frame();
}

void audio_shutdown(void) {
    if (audio_api) {
        if (audio_api->shutdown) audio_api->shutdown();
        audio_api = NULL;
    }
}

void game_deinit(void) {
    configfile_save(gCLIOpts.ConfigFile);;
    controller_shutdown();
    audio_shutdown();
    gfx_shutdown();
    inited = false;
}

void game_exit(void) {
    game_deinit();
#ifndef TARGET_WEB
    exit(0);
#endif
}

#ifdef TARGET_WEB
static void em_main_loop(void) {
}

static void request_anim_frame(void (*func)(double time)) {
    EM_ASM(requestAnimationFrame(function(time) {
        dynCall("vd", $0, [time]);
    }), func);
}

static void on_anim_frame(double time) {
    static double target_time;

    time *= 0.03; // milliseconds to frame count (33.333 ms -> 1)

    if (time >= target_time + 10.0) {
        // We are lagging 10 frames behind, probably due to coming back after inactivity,
        // so reset, with a small margin to avoid potential jitter later.
        target_time = time - 0.010;
    }

    for (int i = 0; i < 2; i++) {
        // If refresh rate is 15 Hz or something we might need to generate two frames
        if (time >= target_time) {
            produce_one_frame();
            target_time = target_time + 1.0;
        }
    }

    if (inited) // only continue if the init flag is still set
        request_anim_frame(on_anim_frame);
}
#endif

void main_func(void) {
    static u64 pool[0x165000/8 / 4 * sizeof(void *)];
    main_pool_init(pool, pool + sizeof(pool) / sizeof(pool[0]));
    gEffectsMemoryPool = mem_pool_init(0x4000, MEMORY_POOL_LEFT);

    configfile_load(gCLIOpts.ConfigFile);

    wm_api = &gfx_sdl;
    rendering_api = &gfx_opengl_api;
    gfx_init(wm_api, rendering_api);

    if (audio_api == NULL && audio_sdl.init()) 
        audio_api = &audio_sdl;

    if (audio_api == NULL) {
        audio_api = &audio_null;
    }

    audio_init();
    sound_init();

    thread5_game_loop(NULL);

    inited = true;

#ifdef TARGET_WEB
    emscripten_set_main_loop(em_main_loop, 0, 0);
    request_anim_frame(on_anim_frame);
#else
    wm_api->main_loop(produce_one_frame);
#endif
}

int main(int argc, char *argv[]) {
    parse_cli_opts(argc, argv);
    main_func();
    return 0;
}