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use bevy::color::{Color, ColorToComponents};

use processing::prelude::*;

use processing_glfw::GlfwContext;

use processing_render::render::command::DrawCommand;

const PENTATONIC: [u8; 5] = [0, 3, 5, 7, 10];

const ROOT: u8 = 48;

const OCTAVES: u8 = 3;

const WIDTH: u32 = 640;

const HEIGHT: u32 = 400;

fn note_at_x(x: f32) -> u8 {

let steps = (PENTATONIC.len() as u8) * OCTAVES;

let t = (x / WIDTH as f32).clamp(0.0, 0.999);

let idx = (t * steps as f32) as u8;

let octave = idx / PENTATONIC.len() as u8;

let degree = (idx % PENTATONIC.len() as u8) as usize;

ROOT + octave * 12 + PENTATONIC[degree]

}

fn velocity_at_y(y: f32) -> u8 {

let t = 1.0 - (y / HEIGHT as f32).clamp(0.0, 1.0);

(16.0 + t * 110.0) as u8

}

fn note_color(note: u8) -> Color {

let hue = ((note - ROOT) as f32 / 12.0).fract() * 360.0;

Color::hsv(hue, 0.7, 0.95)

}

struct Ripple {

x: f32,

y: f32,

age: f32,

color: Color,

}

fn main() {

if let Err(e) = sketch() {

eprintln!("Sketch error: {e:?}");

exit(1).unwrap();

}

exit(0).unwrap();

}

fn sketch() -> error::Result<()> {

let mut glfw_ctx = GlfwContext::new(WIDTH, HEIGHT, false)?;

init(Config::default())?;

let surface = glfw_ctx.create_surface(WIDTH, HEIGHT, false)?;

let graphics = graphics_create(surface, WIDTH, HEIGHT, TextureFormat::Rgba16Float)?;

midi_refresh_ports()?;

let ports = midi_list_ports()?;

if ports.is_empty() {

eprintln!("no MIDI output ports found — connect a synth or virtual port and retry");

return Ok(());

}

for p in &ports {

println!("{p}");

}

midi_connect(0)?;

let mut held: Option<u8> = None;

let mut ripples: Vec<Ripple> = Vec::new();

while glfw_ctx.poll_events() {

graphics_begin_draw(graphics)?;

let mx = input_mouse_x(surface)?;

let my = input_mouse_y(surface)?;

let pressed = input_mouse_is_pressed()?;

match (pressed, held) {

(true, None) => {

let note = note_at_x(mx);

let velocity = velocity_at_y(my);

midi_note_on(note, velocity)?;

ripples.push(Ripple {

x: mx,

y: my,

age: 0.0,

color: note_color(note),

});

held = Some(note);

}

(true, Some(note)) => {

let target = note_at_x(mx);

if target != note {

midi_note_off(note)?;

let velocity = velocity_at_y(my);

midi_note_on(target, velocity)?;

ripples.push(Ripple {

x: mx,

y: my,

age: 0.0,

color: note_color(target),

});

held = Some(target);

}

(false, Some(note)) => {

midi_note_off(note)?;

held = None;

}

_ => {}

}

graphics_record_command(

graphics,

DrawCommand::BackgroundColor(Color::srgb(0.04, 0.04, 0.07)),

)?;

let octave_w = WIDTH as f32 / OCTAVES as f32;

for i in 0..OCTAVES {

let alpha = if i % 2 == 0 { 0.04 } else { 0.0 };

graphics_record_command(

graphics,

DrawCommand::Fill(Color::srgba(1.0, 1.0, 1.0, alpha)),

)?;

graphics_record_command(

graphics,

DrawCommand::Rect {

x: i as f32 * octave_w,

y: 0.0,

w: octave_w,

h: HEIGHT as f32,

radii: [0.0; 4],

)?;

}

ripples.retain_mut(|r| {

r.age += 0.022;

r.age < 1.0

});

for r in &ripples {

let size = 24.0 + r.age * 220.0;

let alpha = (1.0 - r.age).powi(2);

let lin = r.color.to_linear().to_f32_array();

graphics_record_command(

graphics,

DrawCommand::Fill(Color::linear_rgba(lin[0], lin[1], lin[2], alpha)),

)?;

graphics_record_command(

graphics,

DrawCommand::Rect {

x: r.x - size / 2.0,

y: r.y - size / 2.0,

w: size,

h: size,

radii: [size / 2.0; 4],

)?;

}

let preview = note_color(note_at_x(mx));

graphics_record_command(graphics, DrawCommand::Fill(preview))?;

graphics_record_command(

graphics,

DrawCommand::Rect {

x: mx - 8.0,

y: my - 8.0,

w: 16.0,

h: 16.0,

radii: [8.0; 4],

)?;

graphics_end_draw(graphics)?;

if input_key_is_pressed()? && input_key_is_down(KeyCode::Escape)? {

break;

}

if let Some(note) = held {

midi_note_off(note)?;

}

midi_disconnect()?;

Ok(())

}