const dgram = require('dgram');

const {
  clamp,
  createFrame,
  fadeFrame,
  frameToPayload,
  hexToRgb,
  samplePalette,
  toIndex,
} = require('./shared-frame-utils');

const DEFAULT_PORT = 4210;
const DEFAULT_WIDTH = 16;
const DEFAULT_HEIGHT = 16;
const DEFAULT_INTERVAL_MS = 70;
const PRIMARY_SPEED = 0.15;
const SECONDARY_SPEED = 0.32;
const WAVE_SCALE = 0.75;

const paletteStops = [
  { stop: 0.0, color: hexToRgb('100406') },
  { stop: 0.25, color: hexToRgb('2e0f1f') },
  { stop: 0.5, color: hexToRgb('6a1731') },
  { stop: 0.7, color: hexToRgb('b63b32') },
  { stop: 0.85, color: hexToRgb('f48b2a') },
  { stop: 1.0, color: hexToRgb('ffe9b0') },
];

const host = process.argv[2];
const port = parseInt(process.argv[3] || String(DEFAULT_PORT), 10);
const width = parseInt(process.argv[4] || String(DEFAULT_WIDTH), 10);
const height = parseInt(process.argv[5] || String(DEFAULT_HEIGHT), 10);
const intervalMs = parseInt(process.argv[6] || String(DEFAULT_INTERVAL_MS), 10);

if (!host) {
  console.error('Usage: node nebula-drift.js <device-ip> [port] [width] [height] [interval-ms]');
  process.exit(1);
}

if (Number.isNaN(port) || Number.isNaN(width) || Number.isNaN(height) || Number.isNaN(intervalMs)) {
  console.error('Invalid numeric argument. Expected integers for port, width, height, and interval-ms.');
  process.exit(1);
}

if (width <= 0 || height <= 0) {
  console.error('Matrix dimensions must be positive integers.');
  process.exit(1);
}

const socket = dgram.createSocket('udp4');
const isBroadcast = host === '255.255.255.255' || host.endsWith('.255');
const frame = createFrame(width, height);
let timeSeconds = 0;
const frameTimeSeconds = intervalMs / 1000;

if (isBroadcast) {
  socket.bind(() => {
    socket.setBroadcast(true);
  });
}

socket.on('error', (error) => {
  console.error('Socket error:', error.message);
});

function layeredWave(u, v, speed, offset) {
  return Math.sin((u * 3 + v * 2) * Math.PI * WAVE_SCALE + timeSeconds * speed + offset);
}

function generateFrame() {
  timeSeconds += frameTimeSeconds;

  for (let row = 0; row < height; ++row) {
    const v = row / Math.max(1, height - 1);
    for (let col = 0; col < width; ++col) {
      const u = col / Math.max(1, width - 1);
      const primary = layeredWave(u, v, PRIMARY_SPEED, 0);
      const secondary = layeredWave(v, u, SECONDARY_SPEED, Math.PI / 4);
      const tertiary = Math.sin((u + v) * Math.PI * 1.5 + timeSeconds * 0.18);

      const combined = 0.45 * primary + 0.35 * secondary + 0.2 * tertiary;
      const envelope = Math.sin((u * v) * Math.PI * 2 + timeSeconds * 0.1) * 0.25 + 0.75;
      const value = clamp((combined * 0.5 + 0.5) * envelope, 0, 1);

      frame[toIndex(col, row, width)] = samplePalette(paletteStops, value);
    }
  }

  return frameToPayload(frame);
}

function sendFrame() {
  const payload = generateFrame();
  const message = Buffer.from(payload, 'utf8');
  socket.send(message, port, host);
}

setInterval(sendFrame, intervalMs);

console.log(
  `Streaming nebula drift to ${host}:${port} (${width}x${height}, interval=${intervalMs}ms)`
);