const SPACE_BETWEEN_PLATFORMS = 80;

function createPlatform(x, y, elevation, width = 60) {
    const platform = new Sprite();
    platform.x = x;
    platform.y = y;
    platform.elevation = elevation;
    platform.w = width;
    platform.h = 15;
    platform.physics = 'static';
    platform.bounciness = 0;
    return platform;
}


export function updatePlatforms(platforms, elevation, elGain) {
    if (elGain <= 0)
        return platforms;

    let minY = height;
    for (let i = platforms.length - 1; i >= 0; i--) {
        const plat = platforms[i];
        plat.y += elGain;
        if (plat.y > height) {
            platforms.remove(plat);
            continue;
        }
        if (plat.y < minY) {
            minY = plat.y;
        }
    }

    // Add new platforms at the top
    let spawnY = minY - SPACE_BETWEEN_PLATFORMS;
    while (spawnY >= SPACE_BETWEEN_PLATFORMS) {
        const newPlat = createPlatform(random(40, width - 40), spawnY, elevation + minY - spawnY);
        platforms.add(newPlat);
        spawnY -= SPACE_BETWEEN_PLATFORMS;
    }
    return platforms;
}


export function initPlatforms() {
    let platforms = new Group();
    updatePlatforms(platforms, 10, 10);

    const basePlatform = createPlatform(width / 2, height - 10, 0, width);
    platforms.add(basePlatform);
    return platforms;
}