struct Uniforms {
    audio_peak : f32,
};

@group(0) @binding(0) var<uniform> uniforms : Uniforms;

@vertex
fn vs_main(@builtin(vertex_index) vertex_index: u32) -> @builtin(position) vec4<f32> {
    let num_sides = 7.0;
    let angle = f32(vertex_index) * 2.0 * PI / num_sides;
    
    // Base size and pulsating scale based on audio peak
    let base_scale = 0.5;
    let pulse_scale = 0.2 * uniforms.audio_peak;
    let scale = base_scale + pulse_scale;

    // Vertices for a heptagon (fan from center)
    if (vertex_index == 0) { return vec4<f32>(0.0, 0.0, 0.0, 1.0); } // Center
    else { // Subsequent points connect to the center and previous point
        let angle = f32(vertex_index) * 2.0 * PI / num_sides;
        let x = scale * cos(angle);
        let y = scale * sin(angle);
        return vec4<f32>(x, y, 0.0, 1.0);
    }
}

@fragment
fn fs_main() -> @location(0) vec4<f32> {
    // Simple color, maybe with a hue shift based on audio peak
    let hue = uniforms.audio_peak * 0.5; // Adjust as needed for desired color range
    let r = sin(hue + 0.0) * 0.5 + 0.5;
    let g = sin(hue + 2.0) * 0.5 + 0.5;
    let b = sin(hue + 4.0) * 0.5 + 0.5;
    return vec4<f32>(r, g, b, 1.0);
}