/*
  Copyright (C) 1997-2021 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely.
*/
/********************************************************************************
 *                                                                              *
 * Running moose :) Coded by Mike Gorchak.                                      *
 *                                                                              *
 ********************************************************************************/

#include <stdlib.h>
#include <stdio.h>

#ifdef __EMSCRIPTEN__
#include <emscripten/emscripten.h>
#endif

#include "SDL.h"

#define MOOSEPIC_W 64
#define MOOSEPIC_H 88

#define MOOSEFRAME_SIZE (MOOSEPIC_W * MOOSEPIC_H)
#define MOOSEFRAMES_COUNT 10

SDL_Color MooseColors[84] = {
    {49, 49, 49, 255}, {66, 24, 0, 255}, {66, 33, 0, 255}, {66, 66, 66, 255},
    {66, 115, 49, 255}, {74, 33, 0, 255}, {74, 41, 16, 255}, {82, 33, 8, 255},
    {82, 41, 8, 255}, {82, 49, 16, 255}, {82, 82, 82, 255}, {90, 41, 8, 255},
    {90, 41, 16, 255}, {90, 57, 24, 255}, {99, 49, 16, 255}, {99, 66, 24, 255},
    {99, 66, 33, 255}, {99, 74, 33, 255}, {107, 57, 24, 255}, {107, 82, 41, 255},
    {115, 57, 33, 255}, {115, 66, 33, 255}, {115, 66, 41, 255}, {115, 74, 0, 255},
    {115, 90, 49, 255}, {115, 115, 115, 255}, {123, 82, 0, 255}, {123, 99, 57, 255},
    {132, 66, 41, 255}, {132, 74, 41, 255}, {132, 90, 8, 255}, {132, 99, 33, 255},
    {132, 99, 66, 255}, {132, 107, 66, 255}, {140, 74, 49, 255}, {140, 99, 16, 255},
    {140, 107, 74, 255}, {140, 115, 74, 255}, {148, 107, 24, 255}, {148, 115, 82, 255},
    {148, 123, 74, 255}, {148, 123, 90, 255}, {156, 115, 33, 255}, {156, 115, 90, 255},
    {156, 123, 82, 255}, {156, 132, 82, 255}, {156, 132, 99, 255}, {156, 156, 156, 255},
    {165, 123, 49, 255}, {165, 123, 90, 255}, {165, 132, 82, 255}, {165, 132, 90, 255},
    {165, 132, 99, 255}, {165, 140, 90, 255}, {173, 132, 57, 255}, {173, 132, 99, 255},
    {173, 140, 107, 255}, {173, 140, 115, 255}, {173, 148, 99, 255}, {173, 173, 173, 255},
    {181, 140, 74, 255}, {181, 148, 115, 255}, {181, 148, 123, 255}, {181, 156, 107, 255},
    {189, 148, 123, 255}, {189, 156, 82, 255}, {189, 156, 123, 255}, {189, 156, 132, 255},
    {189, 189, 189, 255}, {198, 156, 123, 255}, {198, 165, 132, 255}, {206, 165, 99, 255},
    {206, 165, 132, 255}, {206, 173, 140, 255}, {206, 206, 206, 255}, {214, 173, 115, 255},
    {214, 173, 140, 255}, {222, 181, 148, 255}, {222, 189, 132, 255}, {222, 189, 156, 255},
    {222, 222, 222, 255}, {231, 198, 165, 255}, {231, 231, 231, 255}, {239, 206, 173, 255}
};

Uint8 MooseFrames[MOOSEFRAMES_COUNT][MOOSEFRAME_SIZE];

SDL_Renderer *renderer;
int frame;
SDL_Texture *MooseTexture;
SDL_bool done = SDL_FALSE;

void quit(int rc)
{
    SDL_Quit();
    exit(rc);
}

void UpdateTexture(SDL_Texture *texture, int frame)
{
    SDL_Color *color;
    Uint8 *src;
    Uint32 *dst;
    int row, col;
    void *pixels;
    int pitch;

    if (SDL_LockTexture(texture, NULL, &pixels, &pitch) < 0) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't lock texture: %s\n", SDL_GetError());
        quit(5);
    }
    src = MooseFrames[frame];
    for (row = 0; row < MOOSEPIC_H; ++row) {
        dst = (Uint32*)((Uint8*)pixels + row * pitch);
        for (col = 0; col < MOOSEPIC_W; ++col) {
            color = &MooseColors[*src++];
            *dst++ = (0xFF000000|(color->r<<16)|(color->g<<8)|color->b);
        }
    }
    SDL_UnlockTexture(texture);
}

void
loop()
{
    SDL_Event event;

    while (SDL_PollEvent(&event)) {
        switch (event.type) {
        case SDL_KEYDOWN:
            if (event.key.keysym.sym == SDLK_ESCAPE) {
                done = SDL_TRUE;
            }
            break;
        case SDL_QUIT:
            done = SDL_TRUE;
            break;
        }
    }

    frame = (frame + 1) % MOOSEFRAMES_COUNT;
    UpdateTexture(MooseTexture, frame);

    SDL_RenderClear(renderer);
    SDL_RenderCopy(renderer, MooseTexture, NULL, NULL);
    SDL_RenderPresent(renderer);

#ifdef __EMSCRIPTEN__
    if (done) {
        emscripten_cancel_main_loop();
    }
#endif
}

int
main(int argc, char **argv)
{
    SDL_Window *window;
    SDL_RWops *handle;

    /* Enable standard application logging */
    SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);

    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
        return 1;
    }

    /* load the moose images */
    handle = SDL_RWFromFile("moose.dat", "rb");
    if (handle == NULL) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Can't find the file moose.dat !\n");
        quit(2);
    }
    SDL_RWread(handle, MooseFrames, MOOSEFRAME_SIZE, MOOSEFRAMES_COUNT);
    SDL_RWclose(handle);


    /* Create the window and renderer */
    window = SDL_CreateWindow("Happy Moose",
                              SDL_WINDOWPOS_UNDEFINED,
                              SDL_WINDOWPOS_UNDEFINED,
                              MOOSEPIC_W*4, MOOSEPIC_H*4,
                              SDL_WINDOW_RESIZABLE);
    if (!window) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't set create window: %s\n", SDL_GetError());
        quit(3);
    }

    renderer = SDL_CreateRenderer(window, -1, 0);
    if (!renderer) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't set create renderer: %s\n", SDL_GetError());
        quit(4);
    }

    MooseTexture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STREAMING, MOOSEPIC_W, MOOSEPIC_H);
    if (!MooseTexture) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't set create texture: %s\n", SDL_GetError());
        quit(5);
    }

    /* Loop, waiting for QUIT or the escape key */
    frame = 0;

#ifdef __EMSCRIPTEN__
    emscripten_set_main_loop(loop, 0, 1);
#else
    while (!done) {
        loop();
        }
#endif

    SDL_DestroyRenderer(renderer);

    quit(0);
    return 0;
}

/* vi: set ts=4 sw=4 expandtab: */