/**
 * Light Feature
 * Provides control for smart lights (brightness, color, effects)
 */

import { Feature, type TDeviceReference } from './feature.abstract.js';
import type { IFeatureOptions } from '../interfaces/feature.interfaces.js';
import type {
  TLightProtocol,
  ILightCapabilities,
  ILightState,
  ILightFeatureInfo,
  ILightProtocolClient,
} from '../interfaces/smarthome.interfaces.js';

/**
 * Options for creating a LightFeature
 */
export interface ILightFeatureOptions extends IFeatureOptions {
  /** Protocol type */
  protocol: TLightProtocol;
  /** Entity ID (for Home Assistant) */
  entityId: string;
  /** Protocol client for controlling the light */
  protocolClient: ILightProtocolClient;
  /** Light capabilities */
  capabilities?: Partial<ILightCapabilities>;
}

/**
 * Light Feature - brightness, color, and effect control
 *
 * Protocol-agnostic: works with Home Assistant, Hue, MQTT, Zigbee, etc.
 *
 * @example
 * ```typescript
 * const light = device.getFeature<LightFeature>('light');
 * if (light) {
 *   await light.turnOn({ brightness: 200 });
 *   await light.setColorTemp(4000); // 4000K warm white
 *   await light.setRgbColor(255, 100, 50);
 * }
 * ```
 */
export class LightFeature extends Feature {
  public readonly type = 'light' as const;
  public readonly protocol: TLightProtocol;

  /** Entity ID (e.g., "light.living_room") */
  public readonly entityId: string;

  /** Capabilities */
  public readonly capabilities: ILightCapabilities;

  /** Current state */
  protected _isOn: boolean = false;
  protected _brightness?: number;
  protected _colorTemp?: number;
  protected _colorTempMireds?: number;
  protected _rgbColor?: [number, number, number];
  protected _hsColor?: [number, number];
  protected _xyColor?: [number, number];
  protected _effect?: string;

  /** Protocol client for controlling the light */
  private protocolClient: ILightProtocolClient;

  constructor(
    device: TDeviceReference,
    port: number,
    options: ILightFeatureOptions
  ) {
    super(device, port, options);
    this.protocol = options.protocol;
    this.entityId = options.entityId;
    this.protocolClient = options.protocolClient;

    // Set capabilities with defaults
    this.capabilities = {
      supportsBrightness: options.capabilities?.supportsBrightness ?? false,
      supportsColorTemp: options.capabilities?.supportsColorTemp ?? false,
      supportsRgb: options.capabilities?.supportsRgb ?? false,
      supportsHs: options.capabilities?.supportsHs ?? false,
      supportsXy: options.capabilities?.supportsXy ?? false,
      supportsEffects: options.capabilities?.supportsEffects ?? false,
      supportsTransition: options.capabilities?.supportsTransition ?? true,
      effects: options.capabilities?.effects,
      minMireds: options.capabilities?.minMireds,
      maxMireds: options.capabilities?.maxMireds,
      minColorTempKelvin: options.capabilities?.minColorTempKelvin,
      maxColorTempKelvin: options.capabilities?.maxColorTempKelvin,
    };
  }

  // ============================================================================
  // Properties
  // ============================================================================

  /**
   * Get current on/off state (cached)
   */
  public get isOn(): boolean {
    return this._isOn;
  }

  /**
   * Get current brightness 0-255 (cached)
   */
  public get brightness(): number | undefined {
    return this._brightness;
  }

  /**
   * Get current color temperature in Kelvin (cached)
   */
  public get colorTemp(): number | undefined {
    return this._colorTemp;
  }

  /**
   * Get current color temperature in Mireds (cached)
   */
  public get colorTempMireds(): number | undefined {
    return this._colorTempMireds;
  }

  /**
   * Get current RGB color (cached)
   */
  public get rgbColor(): [number, number, number] | undefined {
    return this._rgbColor;
  }

  /**
   * Get current HS color [hue 0-360, saturation 0-100] (cached)
   */
  public get hsColor(): [number, number] | undefined {
    return this._hsColor;
  }

  /**
   * Get current XY color (cached)
   */
  public get xyColor(): [number, number] | undefined {
    return this._xyColor;
  }

  /**
   * Get current effect (cached)
   */
  public get effect(): string | undefined {
    return this._effect;
  }

  /**
   * Get available effects
   */
  public get effects(): string[] | undefined {
    return this.capabilities.effects;
  }

  // ============================================================================
  // Connection
  // ============================================================================

  protected async doConnect(): Promise<void> {
    // Fetch initial state
    try {
      const state = await this.protocolClient.getState(this.entityId);
      this.updateStateInternal(state);
    } catch {
      // Ignore errors fetching initial state
    }
  }

  protected async doDisconnect(): Promise<void> {
    // Nothing to disconnect
  }

  // ============================================================================
  // Light Control
  // ============================================================================

  /**
   * Turn on the light
   * @param options Optional settings to apply when turning on
   */
  public async turnOn(options?: {
    brightness?: number;
    colorTemp?: number;
    rgb?: [number, number, number];
    transition?: number;
  }): Promise<void> {
    await this.protocolClient.turnOn(this.entityId, options);
    this._isOn = true;
    if (options?.brightness !== undefined) {
      this._brightness = options.brightness;
    }
    if (options?.colorTemp !== undefined) {
      this._colorTemp = options.colorTemp;
    }
    if (options?.rgb !== undefined) {
      this._rgbColor = options.rgb;
    }
    this.emit('state:changed', this.getState());
  }

  /**
   * Turn off the light
   * @param options Optional transition time
   */
  public async turnOff(options?: { transition?: number }): Promise<void> {
    await this.protocolClient.turnOff(this.entityId, options);
    this._isOn = false;
    this.emit('state:changed', this.getState());
  }

  /**
   * Toggle the light
   */
  public async toggle(): Promise<void> {
    await this.protocolClient.toggle(this.entityId);
    this._isOn = !this._isOn;
    this.emit('state:changed', this.getState());
  }

  /**
   * Set brightness level
   * @param brightness Brightness 0-255
   * @param transition Optional transition time in seconds
   */
  public async setBrightness(brightness: number, transition?: number): Promise<void> {
    if (!this.capabilities.supportsBrightness) {
      throw new Error('Light does not support brightness control');
    }

    const clamped = Math.max(0, Math.min(255, Math.round(brightness)));
    await this.protocolClient.setBrightness(this.entityId, clamped, transition);
    this._brightness = clamped;
    if (clamped > 0) {
      this._isOn = true;
    }
    this.emit('state:changed', this.getState());
  }

  /**
   * Set color temperature in Kelvin
   * @param kelvin Color temperature in Kelvin (e.g., 2700 warm, 6500 cool)
   * @param transition Optional transition time in seconds
   */
  public async setColorTemp(kelvin: number, transition?: number): Promise<void> {
    if (!this.capabilities.supportsColorTemp) {
      throw new Error('Light does not support color temperature');
    }

    // Clamp to supported range if available
    let clamped = kelvin;
    if (this.capabilities.minColorTempKelvin && this.capabilities.maxColorTempKelvin) {
      clamped = Math.max(
        this.capabilities.minColorTempKelvin,
        Math.min(this.capabilities.maxColorTempKelvin, kelvin)
      );
    }

    await this.protocolClient.setColorTemp(this.entityId, clamped, transition);
    this._colorTemp = clamped;
    this._colorTempMireds = Math.round(1000000 / clamped);
    this._isOn = true;
    this.emit('state:changed', this.getState());
  }

  /**
   * Set RGB color
   * @param r Red 0-255
   * @param g Green 0-255
   * @param b Blue 0-255
   * @param transition Optional transition time in seconds
   */
  public async setRgbColor(r: number, g: number, b: number, transition?: number): Promise<void> {
    if (!this.capabilities.supportsRgb) {
      throw new Error('Light does not support RGB color');
    }

    const clampedR = Math.max(0, Math.min(255, Math.round(r)));
    const clampedG = Math.max(0, Math.min(255, Math.round(g)));
    const clampedB = Math.max(0, Math.min(255, Math.round(b)));

    await this.protocolClient.setRgbColor(this.entityId, clampedR, clampedG, clampedB, transition);
    this._rgbColor = [clampedR, clampedG, clampedB];
    this._isOn = true;
    this.emit('state:changed', this.getState());
  }

  /**
   * Set light effect
   * @param effect Effect name from available effects
   */
  public async setEffect(effect: string): Promise<void> {
    if (!this.capabilities.supportsEffects) {
      throw new Error('Light does not support effects');
    }

    await this.protocolClient.setEffect(this.entityId, effect);
    this._effect = effect;
    this._isOn = true;
    this.emit('state:changed', this.getState());
  }

  /**
   * Get current state as object
   */
  public getState(): ILightState {
    return {
      isOn: this._isOn,
      brightness: this._brightness,
      colorTemp: this._colorTemp,
      colorTempMireds: this._colorTempMireds,
      rgbColor: this._rgbColor,
      hsColor: this._hsColor,
      xyColor: this._xyColor,
      effect: this._effect,
    };
  }

  /**
   * Refresh state from the device
   */
  public async refreshState(): Promise<ILightState> {
    const state = await this.protocolClient.getState(this.entityId);
    this.updateStateInternal(state);
    return state;
  }

  /**
   * Update state from external source (e.g., state change event)
   */
  public updateState(state: ILightState): void {
    this.updateStateInternal(state);
    this.emit('state:changed', state);
  }

  /**
   * Internal state update
   */
  private updateStateInternal(state: ILightState): void {
    this._isOn = state.isOn;
    this._brightness = state.brightness;
    this._colorTemp = state.colorTemp;
    this._colorTempMireds = state.colorTempMireds;
    this._rgbColor = state.rgbColor;
    this._hsColor = state.hsColor;
    this._xyColor = state.xyColor;
    this._effect = state.effect;
  }

  // ============================================================================
  // Feature Info
  // ============================================================================

  public getFeatureInfo(): ILightFeatureInfo {
    return {
      ...this.getBaseFeatureInfo(),
      type: 'light',
      protocol: this.protocol,
      capabilities: this.capabilities,
      currentState: this.getState(),
    };
  }
}