#include "sldj.h"

void initSldj(Sldj* sldj)
{
    // Create window.
    InitWindow(WINDOW_WIDTH, WINDOW_HEIGHT, "Scanline DJ");
    SetWindowState(FLAG_WINDOW_RESIZABLE);
    SetTargetFPS(DEFAULT_FRAME_RATE);

    sldj->viewport = LoadRenderTexture(DEFAULT_SCREEN_WIDTH, DEFAULT_SCREEN_HEIGHT);
    sldj->frameCounter = 0;
    sldj->xCount = UINT16_MAX / DEFAULT_SCREEN_WIDTH;
    sldj->yCount = UINT16_MAX / DEFAULT_SCREEN_HEIGHT;

    // Scripting.
    initScripting(&sldj->scripting);
    sldj->scriptFilepath[0] = '\0';
}

void updateSldj(Sldj* sldj)
{
    BeginDrawing();

    // Scan image.
    BeginTextureMode(sldj->viewport);

    if (sldj->scripting.lineScanner != NULL)
    {
        uint16_t xScan = 0;
        uint16_t yScan = 0;
        
        for (int y = 0; y < sldj->viewport.texture.height; ++y)
        {
            xScan = 0;
            
            for (int x = 0; x < sldj->viewport.texture.width; ++x)
            {
                DrawPixel(x, y, sldj->scripting.lineScanner(xScan, yScan, sldj->frameCounter));
                xScan += sldj->xCount;
            }

            yScan += sldj->yCount;
        }
    }

    EndTextureMode();
    ClearBackground(DARKGRAY);

    // Draw scanned image.
    Texture viewport = sldj->viewport.texture;
    
    DrawTexturePro(
        viewport,
        (Rectangle){0.0, 0.0, viewport.width, viewport.height},
        (Rectangle){0.0, 0.0, GetScreenWidth(), GetScreenHeight()},
        (Vector2){0.0, 0.0},
        0.0,
        WHITE
    );

    DrawFPS(0, 0);

    if (IsKeyPressed(KEY_R))
    {
        reloadScript(sldj);
    }

    EndDrawing();

    ++sldj->frameCounter;
}

void closeSldj(Sldj* sldj)
{
    UnloadRenderTexture(sldj->viewport);
    closeScripting(&sldj->scripting);
    
    CloseWindow();
}

void resetViewport(Sldj* sldj, int width, int height)
{
    UnloadRenderTexture(sldj->viewport);
    sldj->viewport = LoadRenderTexture(width, height);
    sldj->xCount = UINT16_MAX / width;
    sldj->yCount = UINT16_MAX / height;
}

void reloadScriptContext(Sldj* sldj)
{
}

void reloadScript(Sldj* sldj)
{
    if (sldj->scriptFilepath[0] != '\0')
    {
        compileScript(&sldj->scripting, sldj->scriptFilepath);
    }
}