#include <raylib.h>
#include "WindowManager.h"



WindowManager::WindowManager( char* title, float screen_width, float screen_height ) {
    _title = title;
    _screenWidth = screen_width;
    _screenHeight = screen_height;
    _aspectRatio = (double)screen_width / screen_height;
    InitWindow(_screenWidth, _screenHeight, _title);
    Screen = LoadRenderTexture(_screenWidth, _screenHeight);
    ScaledScreen = LoadRenderTexture(_screenWidth, _screenHeight);
    _scaledHeight = screen_height;
    _scaledWidth = screen_width;
}


void WindowManager::UpdateScale() {
    // Changed
    bool hasChanged = (_screenWidth != GetScreenWidth()) || (_screenHeight != GetScreenHeight());

    if ( hasChanged ) {

        // Update Scaled Size
        int width = GetScreenWidth();
        int height = GetScreenHeight();
        double aspectRatio = (double)width / height;

        int newWidth = 0;
        int newHeight = 0;

        if (aspectRatio > _aspectRatio) {
            _scaledWidth = height * _aspectRatio;
            _scaledHeight = height;
        } else {
            _scaledWidth = width;
            _scaledHeight = width / _aspectRatio;
        }

        // Update Texture Size
        ScaledScreen = LoadRenderTexture(_scaledWidth, _scaledHeight);

    }
}



void WindowManager::Display () {

    BeginTextureMode(ScaledScreen);
    DrawTexturePro(Screen.texture, { 0, 0, static_cast<float>(_screenWidth), -static_cast<float>(_screenHeight) }, { 0, 0, static_cast<float>(ScaledScreen.texture.width), static_cast<float>(ScaledScreen.texture.height) }, { 0, 0 }, 0.0f, WHITE);
    EndTextureMode();

    float xStart = -(GetScreenWidth() - _scaledWidth) / 2;
    float yStart = -(GetScreenHeight() - _scaledHeight) / 2;

    BeginDrawing();
    ClearBackground(BLACK);


    DrawTexturePro(Screen.texture, { 0, 0, static_cast<float>(_screenWidth), -static_cast<float>(_screenHeight) }, { 0, 0, static_cast<float>(ScaledScreen.texture.width), static_cast<float>(ScaledScreen.texture.height) }, { xStart, yStart }, 0.0f, WHITE);

    EndDrawing();
}