/**
 * Fan Feature
 * Provides control for fans (speed, oscillation, direction)
 */

import { Feature, type TDeviceReference } from './feature.abstract.js';
import type { IFeatureOptions } from '../interfaces/feature.interfaces.js';
import type {
  TFanProtocol,
  TFanDirection,
  IFanCapabilities,
  IFanState,
  IFanFeatureInfo,
  IFanProtocolClient,
} from '../interfaces/smarthome.interfaces.js';

/**
 * Options for creating a FanFeature
 */
export interface IFanFeatureOptions extends IFeatureOptions {
  /** Protocol type */
  protocol: TFanProtocol;
  /** Entity ID (for Home Assistant) */
  entityId: string;
  /** Protocol client for controlling the fan */
  protocolClient: IFanProtocolClient;
  /** Fan capabilities */
  capabilities?: Partial<IFanCapabilities>;
}

/**
 * Fan Feature - speed, oscillation, and direction control
 *
 * Protocol-agnostic: works with Home Assistant, MQTT, Bond, etc.
 *
 * @example
 * ```typescript
 * const fan = device.getFeature<FanFeature>('fan');
 * if (fan) {
 *   await fan.turnOn(75); // 75% speed
 *   await fan.setOscillating(true);
 * }
 * ```
 */
export class FanFeature extends Feature {
  public readonly type = 'fan' as const;
  public readonly protocol: TFanProtocol;

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

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

  /** Current state */
  protected _isOn: boolean = false;
  protected _percentage?: number;
  protected _presetMode?: string;
  protected _oscillating?: boolean;
  protected _direction?: TFanDirection;

  /** Protocol client for controlling the fan */
  private protocolClient: IFanProtocolClient;

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

    this.capabilities = {
      supportsSpeed: options.capabilities?.supportsSpeed ?? true,
      supportsOscillate: options.capabilities?.supportsOscillate ?? false,
      supportsDirection: options.capabilities?.supportsDirection ?? false,
      supportsPresetModes: options.capabilities?.supportsPresetModes ?? false,
      presetModes: options.capabilities?.presetModes,
      speedCount: options.capabilities?.speedCount,
    };
  }

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

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

  /**
   * Get current speed percentage 0-100 (cached)
   */
  public get percentage(): number | undefined {
    return this._percentage;
  }

  /**
   * Get current preset mode (cached)
   */
  public get presetMode(): string | undefined {
    return this._presetMode;
  }

  /**
   * Get oscillating state (cached)
   */
  public get oscillating(): boolean | undefined {
    return this._oscillating;
  }

  /**
   * Get direction (cached)
   */
  public get direction(): TFanDirection | undefined {
    return this._direction;
  }

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

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

  protected async doConnect(): Promise<void> {
    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
  }

  // ============================================================================
  // Fan Control
  // ============================================================================

  /**
   * Turn on the fan
   * @param percentage Optional speed percentage
   */
  public async turnOn(percentage?: number): Promise<void> {
    await this.protocolClient.turnOn(this.entityId, percentage);
    this._isOn = true;
    if (percentage !== undefined) {
      this._percentage = percentage;
    }
    this.emit('state:changed', this.getState());
  }

  /**
   * Turn off the fan
   */
  public async turnOff(): Promise<void> {
    await this.protocolClient.turnOff(this.entityId);
    this._isOn = false;
    this.emit('state:changed', this.getState());
  }

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

  /**
   * Set speed percentage
   * @param percentage Speed 0-100
   */
  public async setPercentage(percentage: number): Promise<void> {
    if (!this.capabilities.supportsSpeed) {
      throw new Error('Fan does not support speed control');
    }

    const clamped = Math.max(0, Math.min(100, Math.round(percentage)));
    await this.protocolClient.setPercentage(this.entityId, clamped);
    this._percentage = clamped;
    this._isOn = clamped > 0;
    this.emit('state:changed', this.getState());
  }

  /**
   * Set preset mode
   * @param mode Preset mode name
   */
  public async setPresetMode(mode: string): Promise<void> {
    if (!this.capabilities.supportsPresetModes) {
      throw new Error('Fan does not support preset modes');
    }

    await this.protocolClient.setPresetMode(this.entityId, mode);
    this._presetMode = mode;
    this._isOn = true;
    this.emit('state:changed', this.getState());
  }

  /**
   * Set oscillating state
   * @param oscillating Whether to oscillate
   */
  public async setOscillating(oscillating: boolean): Promise<void> {
    if (!this.capabilities.supportsOscillate) {
      throw new Error('Fan does not support oscillation');
    }

    await this.protocolClient.setOscillating(this.entityId, oscillating);
    this._oscillating = oscillating;
    this.emit('state:changed', this.getState());
  }

  /**
   * Set direction
   * @param direction forward or reverse
   */
  public async setDirection(direction: TFanDirection): Promise<void> {
    if (!this.capabilities.supportsDirection) {
      throw new Error('Fan does not support direction control');
    }

    await this.protocolClient.setDirection(this.entityId, direction);
    this._direction = direction;
    this.emit('state:changed', this.getState());
  }

  /**
   * Get current state as object
   */
  public getState(): IFanState {
    return {
      isOn: this._isOn,
      percentage: this._percentage,
      presetMode: this._presetMode,
      oscillating: this._oscillating,
      direction: this._direction,
    };
  }

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

  /**
   * Update state from external source
   */
  public updateState(state: IFanState): void {
    this.updateStateInternal(state);
    this.emit('state:changed', state);
  }

  /**
   * Internal state update
   */
  private updateStateInternal(state: IFanState): void {
    this._isOn = state.isOn;
    this._percentage = state.percentage;
    this._presetMode = state.presetMode;
    this._oscillating = state.oscillating;
    this._direction = state.direction;
  }

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

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