/*******************************************************************************************
*
*   Koala Seasons [emegeme 2015]
*
*   Koala Seasons is a runner, you must survive as long as possible jumping from tree to tree
*   Ready to start the adventure? How long can you survive?
*
*   This game has been created using raylib 1.5 (www.raylib.com)
*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
*
*   Copyright (c) 2014-2016 Ramon Santamaria (@raysan5)
*
********************************************************************************************/

#include "raylib.h"
#include "screens/screens.h"    // NOTE: Defines global variable: currentScreen

#if defined(PLATFORM_WEB)
    #include <emscripten/emscripten.h>
#endif

//----------------------------------------------------------------------------------
// Global Variables Definition (local to this module)
//----------------------------------------------------------------------------------
static const int screenWidth = 1280;
static const int screenHeight = 720;

static float transAlpha = 0;
static bool onTransition = false;
static bool transFadeOut = false;
static int transFromScreen = -1;
static int transToScreen = -1;
static int framesCounter = 0;

static Music music;

//----------------------------------------------------------------------------------
// Local Functions Declaration
//----------------------------------------------------------------------------------
void TransitionToScreen(int screen);
void UpdateTransition(void);
void DrawTransition(void);

void UpdateDrawFrame(void);     // Update and Draw one frame

//----------------------------------------------------------------------------------
// Main entry point
//----------------------------------------------------------------------------------
int main(void) 
{
    // Initialization (Note windowTitle is unused on Android)
    //---------------------------------------------------------
    InitWindow(screenWidth, screenHeight, "KOALA SEASONS");

    // Load global data here (assets that must be available in all screens, i.e. fonts)
    font = LoadFont("resources/graphics/mainfont.png");

    atlas01 = LoadTexture("resources/graphics/atlas01.png");
    atlas02 = LoadTexture("resources/graphics/atlas02.png");
    
#if defined(PLATFORM_WEB) || defined(PLATFORM_RPI) || defined(PLATFORM_ANDROID)
    colorBlend = LoadShader(0, "resources/shaders/glsl100/blend_color.fs");
#else
    colorBlend = LoadShader(0, "resources/shaders/glsl330/blend_color.fs");
#endif

    InitAudioDevice();
    
    // Load sounds data
    fxJump = LoadSound("resources/audio/jump.ogg");
    fxDash = LoadSound("resources/audio/dash.ogg");
    fxEatLeaves = LoadSound("resources/audio/eat_leaves.ogg");
    fxHitResin = LoadSound("resources/audio/resin_hit.ogg");
    fxWind = LoadSound("resources/audio/wind_sound.ogg");
    fxDieSnake = LoadSound("resources/audio/snake_die.ogg");
    fxDieDingo = LoadSound("resources/audio/dingo_die.ogg");
    fxDieOwl = LoadSound("resources/audio/owl_die.ogg");
    
    music = LoadMusicStream("resources/audio/jngl.xm");
    PlayMusicStream(music);
    SetMusicVolume(music, 2.0f);

    // Define and init first screen
    // NOTE: currentScreen is defined in screens.h as a global variable
    currentScreen = TITLE;
    InitTitleScreen();

#if defined(PLATFORM_WEB)
    emscripten_set_main_loop(UpdateDrawFrame, 0, 1);
#else
    SetTargetFPS(60);   // Set our game to run at 60 frames-per-second
    //--------------------------------------------------------------------------------------
    
    // Main game loop
    while (!WindowShouldClose()) UpdateDrawFrame();
#endif

    // De-Initialization
    //--------------------------------------------------------------------------------------
    UnloadEndingScreen();
    UnloadTitleScreen();
    UnloadGameplayScreen();
    UnloadLogoScreen();
    
    UnloadTexture(atlas01);
    UnloadTexture(atlas02);
    UnloadFont(font);
    
    UnloadShader(colorBlend);   // Unload color overlay blending shader
    
    UnloadSound(fxJump);
    UnloadSound(fxDash);
    UnloadSound(fxEatLeaves);
    UnloadSound(fxHitResin);
    UnloadSound(fxWind);
    UnloadSound(fxDieSnake);
    UnloadSound(fxDieDingo);
    UnloadSound(fxDieOwl);
    
    UnloadMusicStream(music);
    
    CloseAudioDevice();         // Close audio device

    CloseWindow();              // Close window and OpenGL context
    //--------------------------------------------------------------------------------------

    return 0;
}

void TransitionToScreen(int screen)
{
    onTransition = true;
    transFromScreen = currentScreen;
    transToScreen = screen;
}

void UpdateTransition(void)
{
    if (!transFadeOut)
    {
        transAlpha += 0.05f;

        if (transAlpha >= 1.0)
        {
            transAlpha = 1.0;
            currentScreen = transToScreen;
            transFadeOut = true;
            framesCounter = 0;
        }
    }
    else  // Transition fade out logic
    {
        transAlpha -= 0.05f;

        if (transAlpha <= 0)
        {
            transAlpha = 0;
            transFadeOut = false;
            onTransition = false;
            transFromScreen = -1;
            transToScreen = -1;
        }
    }
}

void DrawTransition(void)
{
    DrawRectangle(0, 0, GetScreenWidth(), GetScreenHeight(), Fade(BLACK, transAlpha));
}

// Update and Draw one frame
void UpdateDrawFrame(void)
{
    // Update
    //----------------------------------------------------------------------------------
    if (!onTransition)
    {
        switch (currentScreen)
        {
            case LOGO:
            {
                UpdateLogoScreen();

                if (FinishLogoScreen()) TransitionToScreen(TITLE);

            } break;
            case TITLE:
            {
                UpdateTitleScreen();

                // NOTE: FinishTitleScreen() return an int defining the screen to jump to
                if (FinishTitleScreen() == 1)
                {
                    UnloadTitleScreen();
                    //currentScreen = OPTIONS;
                    //InitOptionsScreen();
                }
                else if (FinishTitleScreen() == 2)
                {
                    UnloadTitleScreen();
                    
                    InitGameplayScreen();
                    TransitionToScreen(GAMEPLAY);
                }
            } break;
            case GAMEPLAY:
            {
                UpdateGameplayScreen();

                if (FinishGameplayScreen())
                {
                    UnloadGameplayScreen();
                    
                    InitEndingScreen();
                    TransitionToScreen(ENDING); 
                }
            } break;
            case ENDING:
            {
                UpdateEndingScreen();

                if (FinishEndingScreen())
                {
                    UnloadEndingScreen();
                    
                    InitGameplayScreen();
                    TransitionToScreen(GAMEPLAY); 
                }
            } break;
            default: break;
        }
    }
    else UpdateTransition();
    
    UpdateMusicStream(music);
    //----------------------------------------------------------------------------------

    // Draw
    //----------------------------------------------------------------------------------
    BeginDrawing();

        ClearBackground(WHITE);
        
        switch (currentScreen)
        {
            case LOGO: DrawLogoScreen(); break;
            case TITLE: DrawTitleScreen(); break;
            case GAMEPLAY: DrawGameplayScreen(); break;
            case ENDING: DrawEndingScreen(); break;
            default: break;
        }

        if (onTransition) DrawTransition();

        DrawRectangle(GetScreenWidth() - 200, GetScreenHeight() - 50, 200, 40, Fade(WHITE, 0.6f));
        DrawText("ALPHA VERSION", GetScreenWidth() - 180, GetScreenHeight() - 40, 20, DARKGRAY);

    EndDrawing();
    //----------------------------------------------------------------------------------
}