// Circuit Pulse preset for LEDLab

const BasePreset = require('./base-preset');
const { createFrame, fadeFrame, frameToPayload, hexToRgb, samplePalette, toIndex, addHexColor } = require('./frame-utils');

class CircuitPulsePreset extends BasePreset {
  constructor(width = 16, height = 16) {
    super(width, height);
    this.paths = [];
    this.pulses = [];
    this.paletteStops = [
      { stop: 0.0, color: hexToRgb('020209') },
      { stop: 0.3, color: hexToRgb('023047') },
      { stop: 0.6, color: hexToRgb('115173') },
      { stop: 0.8, color: hexToRgb('1ca78f') },
      { stop: 1.0, color: hexToRgb('94fdf3') },
    ];
    this.accentColors = ['14f5ff', 'a7ff4d', 'ffcc3f'];
    this.defaultParameters = {
      pathFade: 0.85,
      pulseLength: 6,
      pulseSpeed: 5.0,
      pulseCount: 3,
    };
  }

  init() {
    super.init();
    this.paths = this.createPaths(this.width, this.height);
    this.pulses = this.createPulses(this.paths.length);
  }

  createPaths(matrixWidth, matrixHeight) {
    const horizontalStep = Math.max(2, Math.floor(matrixHeight / 4));
    const verticalStep = Math.max(2, Math.floor(matrixWidth / 4));
    const generatedPaths = [];

    // Horizontal paths
    for (let y = 1; y < matrixHeight; y += horizontalStep) {
      const path = [];
      for (let x = 0; x < matrixWidth; ++x) {
        path.push({ x, y });
      }
      generatedPaths.push(path);
    }

    // Vertical paths
    for (let x = 2; x < matrixWidth; x += verticalStep) {
      const path = [];
      for (let y = 0; y < matrixHeight; ++y) {
        path.push({ x, y });
      }
      generatedPaths.push(path);
    }

    return generatedPaths;
  }

  createPulses(count) {
    const pulseList = [];
    for (let index = 0; index < count; ++index) {
      pulseList.push(this.spawnPulse(index));
    }
    return pulseList;
  }

  spawnPulse(pathIndex) {
    const color = this.accentColors[pathIndex % this.accentColors.length];
    return {
      pathIndex,
      position: 0,
      speed: 3 + Math.random() * 2,
      color,
    };
  }

  updatePulse(pulse, deltaSeconds) {
    pulse.position += pulse.speed * deltaSeconds;
    const path = this.paths[pulse.pathIndex];

    if (!path || path.length === 0) {
      return;
    }

    if (pulse.position >= path.length + this.getParameter('pulseLength')) {
      Object.assign(pulse, this.spawnPulse(pulse.pathIndex));
      pulse.position = 0;
    }
  }

  renderPulse(pulse) {
    const path = this.paths[pulse.pathIndex];
    if (!path) {
      return;
    }

    const pulseLength = this.getParameter('pulseLength');

    for (let offset = 0; offset < pulseLength; ++offset) {
      const index = Math.floor(pulse.position) - offset;
      if (index < 0 || index >= path.length) {
        continue;
      }

      const { x, y } = path[index];
      const intensity = Math.max(0, 1 - offset / pulseLength);
      const baseColor = samplePalette(this.paletteStops, intensity);
      this.frame[toIndex(x, y, this.width)] = baseColor;
      addHexColor(this.frame, toIndex(x, y, this.width), pulse.color, intensity * 1.4);
    }
  }

  renderFrame() {
    this.frame = createFrame(this.width, this.height);
    const pathFade = this.getParameter('pathFade') || 0.85;
    const pulseCount = this.getParameter('pulseCount') || 3;

    fadeFrame(this.frame, pathFade);

    // Update pulse count if it changed
    while (this.pulses.length < pulseCount) {
      this.pulses.push(this.spawnPulse(this.pulses.length));
    }
    while (this.pulses.length > pulseCount) {
      this.pulses.pop();
    }

    this.pulses.forEach((pulse) => {
      this.updatePulse(pulse, 0.016); // Assume 60 FPS
      this.renderPulse(pulse);
    });

    return this.frame;
  }

  getMetadata() {
    return {
      name: 'Circuit Pulse',
      description: 'Animated circuit board with pulsing paths',
      parameters: {
        pathFade: { type: 'range', min: 0.7, max: 0.95, step: 0.05, default: 0.85 },
        pulseLength: { type: 'range', min: 3, max: 12, step: 1, default: 6 },
        pulseSpeed: { type: 'range', min: 2.0, max: 8.0, step: 0.5, default: 5.0 },
        pulseCount: { type: 'range', min: 1, max: 6, step: 1, default: 3 },
      },
      width: this.width,
      height: this.height,
    };
  }
}

module.exports = CircuitPulsePreset;