#include <raylib.h>

int main() {

    // Specified width and height
    const int windowWidth{800};
    const int windowHeight{600};
    // Initialize the window
    InitWindow(windowWidth, windowHeight, "ECS Dapper Dasher");
    
    // Acceleration due to gravity (pixels per frame/frame)
    const int gravity{ 1'000 };

    // Scarfy setup
    Texture2D scarfy = LoadTexture("textures/scarfy.png"); // Load the texture
    Rectangle scarfyRect;
    scarfyRect.width = scarfy.width / 6;
    scarfyRect.height = scarfy.height;
    scarfyRect.x = 0;
    scarfyRect.y = 0;
    Vector2 scarfyPos;
    scarfyPos.x = windowWidth / 2 - scarfyRect.width / 2;
    scarfyPos.y = windowHeight - scarfyRect.height;

    // Nebula setup
    Texture2D nebula = LoadTexture("textures/12_nebula_spritesheet.png"); // Load the texture
    Rectangle nebulaRect{0.0, 0.0, nebula.width / 8, nebula.height / 8};
    Vector2 nebulaPos{windowWidth, windowHeight - nebulaRect.height};
    
    int nevVel{-600}; // Nebula x velocity (pixels per second)

    // Animation Frame
    int frame{};

    const float updateTime{1.0 / 12.0}; // Time between frames
    float runningTime{}; // Time since last frame change

    // Is the rectangle in the air
    bool isInAir{};

    int velocity{}; // Current velocity

    // Jump velocity (pixels per second)
    const int jumpVelocity{-600};

    // Main game loop
    SetTargetFPS(60);
    while (!WindowShouldClose())
    {
        // Delta time
        const float dT = GetFrameTime(); // Delta time (time since last frame)
        
        // Start Game Logic
        BeginDrawing();
        ClearBackground(WHITE);

        // perform ground check
        if (scarfyPos.y >= windowHeight - scarfyRect.height) {
            velocity = 0; // Reset velocity when on the ground
            isInAir = false;
        }
        else
        {
            velocity += gravity * dT; // Apply gravity when in the air
            isInAir = true;
        }

        // Jump logic / jump check
        if (IsKeyPressed(KEY_SPACE) && !isInAir) {
            velocity += jumpVelocity; // Jump velocity
        }
        
        // Update position
        scarfyPos.y += velocity * dT;
        
        if (!isInAir) 
        {
            // Update running time
            runningTime += dT;
            if (runningTime >= updateTime) 
            {
                runningTime = 0.0;
                
                // Update animation frame
                scarfyRect.x = frame * scarfyRect.width;
                frame++;
                if (frame > 5)
                {
                    frame = 0;
                }
            }
        }

        // draw Nebula
        DrawTextureRec(nebula, nebulaRect, nebulaPos, WHITE); // Draw the texture

        // draw Scarfy
        DrawTextureRec(scarfy, scarfyRect, scarfyPos, WHITE); // Draw the texture
        
        // End Game Logic
        EndDrawing();
    }
    
    // Unload texture
    UnloadTexture(scarfy);
    UnloadTexture(nebula);

    // Close the window properly
    CloseWindow();
}