nooise 1.1.0

Ambient music generator for the terminal
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use std::error::Error;
use std::f32::consts::TAU;
use std::io;
use std::sync::Arc;
use std::sync::atomic::{AtomicU64, Ordering};
use std::time::Instant;

use arc_swap::ArcSwap;

use crossterm::{
    event::{self, Event, KeyCode, KeyEventKind, KeyModifiers},
    execute,
    terminal::{EnterAlternateScreen, LeaveAlternateScreen, disable_raw_mode, enable_raw_mode},
};
use rand::rngs::StdRng;
use rand::{Rng, SeedableRng};
use ratatui::{
    Frame, Terminal,
    backend::CrosstermBackend,
    buffer::Buffer,
    layout::{Alignment, Constraint, Direction, Layout, Rect},
    style::{Color, Modifier, Style},
    text::{Line, Span},
    widgets::{Block, Borders, Paragraph, Widget},
};

use crate::audio::{self, StereoEngine};
use crate::fx::lfo::DriftingLfo;
use crate::fx::panner::StereoPanner;
use crate::fx::reverb::Freeverb;
use crate::synth::envelope::Adsr;
use crate::synth::noise::WhiteNoise;
use crate::synth::oscillator::SineOscillator;

mod controls;
mod engine;
mod registry;
mod ui;
mod voice;

#[cfg(test)]
mod tests;

use controls::*;
use engine::*;
use registry::*;
use ui::*;
use voice::*;

// ============================================================
// Telemetry — audio thread publishes, UI thread reads
// ============================================================

/// Lock-free channel from the engine to the visualizer. The audio thread only
/// ever stores; the UI thread only ever loads. `kick_pulse` is a monotonic
/// counter (UI tracks the delta to fire one ripple per hit); `chord_index`
/// mirrors the pad engine's current chord.
#[derive(Default)]
pub(crate) struct FluidTelemetry {
    pub chord_index: AtomicU64,
    pub kick_pulse: AtomicU64,
}

// ============================================================
// Entry point
// ============================================================

const APP_ID: &str = "nooise";

pub(crate) fn run() -> Result<(), Box<dyn Error>> {
    let controls = Arc::new(ArcSwap::from_pointee(FluidControls::default()));
    let controls_for_engine = Arc::clone(&controls);
    let telemetry = Arc::new(FluidTelemetry::default());
    let telemetry_for_engine = Arc::clone(&telemetry);

    let _stream = audio::start_stream(APP_ID, move |sr| {
        FluidEngine::new(sr, controls_for_engine, telemetry_for_engine)
    })?;

    enable_raw_mode()?;
    let mut stdout = io::stdout();
    execute!(stdout, EnterAlternateScreen)?;
    let backend = CrosstermBackend::new(stdout);
    let mut terminal = Terminal::new(backend)?;

    let result = ui_loop(&mut terminal, controls, telemetry);

    disable_raw_mode()?;
    execute!(terminal.backend_mut(), LeaveAlternateScreen)?;
    result
}

/// Render the default mix to a wav file without a terminal or audio device.
pub(crate) fn render_wav(
    seconds: f32,
    out: &std::path::Path,
    seed: Option<u64>,
) -> Result<(), Box<dyn Error>> {
    const RENDER_SAMPLE_RATE: u32 = 44_100;

    let controls = Arc::new(ArcSwap::from_pointee(FluidControls::default()));
    let telemetry = Arc::new(FluidTelemetry::default());
    let mut engine = FluidEngine::new(RENDER_SAMPLE_RATE as f32, controls, telemetry);
    if let Some(seed) = seed {
        engine.reseed(seed);
    }

    let spec = hound::WavSpec {
        channels: 2,
        sample_rate: RENDER_SAMPLE_RATE,
        bits_per_sample: 16,
        sample_format: hound::SampleFormat::Int,
    };
    let mut writer = hound::WavWriter::create(out, spec)
        .map_err(|e| format!("failed to create {}: {e}", out.display()))?;

    let total_frames = (seconds * RENDER_SAMPLE_RATE as f32) as u64;
    for _ in 0..total_frames {
        let (left, right) = engine.next_stereo();
        writer.write_sample((left.clamp(-1.0, 1.0) * i16::MAX as f32) as i16)?;
        writer.write_sample((right.clamp(-1.0, 1.0) * i16::MAX as f32) as i16)?;
    }
    writer
        .finalize()
        .map_err(|e| format!("failed to finalize {}: {e}", out.display()))?;
    println!(
        "rendered {seconds} s ({total_frames} frames) at {RENDER_SAMPLE_RATE} Hz to {}",
        out.display()
    );
    Ok(())
}