/**
 * Cover Feature
 * Provides control for covers, blinds, garage doors, etc.
 */

import { Feature, type TDeviceReference } from './feature.abstract.js';
import type { IFeatureOptions } from '../interfaces/feature.interfaces.js';
import type {
  TCoverProtocol,
  TCoverDeviceClass,
  TCoverState,
  ICoverCapabilities,
  ICoverStateInfo,
  ICoverFeatureInfo,
  ICoverProtocolClient,
} from '../interfaces/smarthome.interfaces.js';

/**
 * Options for creating a CoverFeature
 */
export interface ICoverFeatureOptions extends IFeatureOptions {
  /** Protocol type */
  protocol: TCoverProtocol;
  /** Entity ID (for Home Assistant) */
  entityId: string;
  /** Protocol client for controlling the cover */
  protocolClient: ICoverProtocolClient;
  /** Device class */
  deviceClass?: TCoverDeviceClass;
  /** Cover capabilities */
  capabilities?: Partial<ICoverCapabilities>;
}

/**
 * Cover Feature - control for blinds, garage doors, etc.
 *
 * Protocol-agnostic: works with Home Assistant, MQTT, Somfy, etc.
 *
 * @example
 * ```typescript
 * const cover = device.getFeature<CoverFeature>('cover');
 * if (cover) {
 *   await cover.open();
 *   await cover.setPosition(50); // 50% open
 * }
 * ```
 */
export class CoverFeature extends Feature {
  public readonly type = 'cover' as const;
  public readonly protocol: TCoverProtocol;

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

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

  /** Current cover state (not connection state) */
  protected _coverState: TCoverState = 'unknown';
  protected _position?: number;
  protected _tiltPosition?: number;

  /** Protocol client for controlling the cover */
  private protocolClient: ICoverProtocolClient;

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

    this.capabilities = {
      deviceClass: options.deviceClass,
      supportsOpen: options.capabilities?.supportsOpen ?? true,
      supportsClose: options.capabilities?.supportsClose ?? true,
      supportsStop: options.capabilities?.supportsStop ?? true,
      supportsPosition: options.capabilities?.supportsPosition ?? false,
      supportsTilt: options.capabilities?.supportsTilt ?? false,
    };
  }

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

  /**
   * Get current state (cached)
   */
  public get coverState(): TCoverState {
    return this._coverState;
  }

  /**
   * Get current position 0-100 (cached)
   * 0 = closed, 100 = fully open
   */
  public get position(): number | undefined {
    return this._position;
  }

  /**
   * Get current tilt position 0-100 (cached)
   */
  public get tiltPosition(): number | undefined {
    return this._tiltPosition;
  }

  /**
   * Check if cover is open
   */
  public get isOpen(): boolean {
    return this._coverState === 'open';
  }

  /**
   * Check if cover is closed
   */
  public get isClosed(): boolean {
    return this._coverState === 'closed';
  }

  /**
   * Check if cover is opening
   */
  public get isOpening(): boolean {
    return this._coverState === 'opening';
  }

  /**
   * Check if cover is closing
   */
  public get isClosing(): boolean {
    return this._coverState === 'closing';
  }

  // ============================================================================
  // 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
  }

  // ============================================================================
  // Cover Control
  // ============================================================================

  /**
   * Open the cover
   */
  public async open(): Promise<void> {
    if (!this.capabilities.supportsOpen) {
      throw new Error('Cover does not support open');
    }
    await this.protocolClient.open(this.entityId);
    this._coverState = 'opening';
    this.emit('state:changed', this.getState());
  }

  /**
   * Close the cover
   */
  public async close(): Promise<void> {
    if (!this.capabilities.supportsClose) {
      throw new Error('Cover does not support close');
    }
    await this.protocolClient.close(this.entityId);
    this._coverState = 'closing';
    this.emit('state:changed', this.getState());
  }

  /**
   * Stop the cover
   */
  public async stop(): Promise<void> {
    if (!this.capabilities.supportsStop) {
      throw new Error('Cover does not support stop');
    }
    await this.protocolClient.stop(this.entityId);
    this._coverState = 'stopped';
    this.emit('state:changed', this.getState());
  }

  /**
   * Set cover position
   * @param position Position 0-100 (0 = closed, 100 = open)
   */
  public async setPosition(position: number): Promise<void> {
    if (!this.capabilities.supportsPosition) {
      throw new Error('Cover does not support position control');
    }

    const clamped = Math.max(0, Math.min(100, Math.round(position)));
    await this.protocolClient.setPosition(this.entityId, clamped);
    this._position = clamped;
    this._coverState = clamped === 0 ? 'closed' : clamped === 100 ? 'open' : 'stopped';
    this.emit('state:changed', this.getState());
  }

  /**
   * Set tilt position
   * @param position Tilt position 0-100
   */
  public async setTiltPosition(position: number): Promise<void> {
    if (!this.capabilities.supportsTilt) {
      throw new Error('Cover does not support tilt control');
    }

    const clamped = Math.max(0, Math.min(100, Math.round(position)));
    await this.protocolClient.setTiltPosition(this.entityId, clamped);
    this._tiltPosition = clamped;
    this.emit('state:changed', this.getState());
  }

  /**
   * Get current state as object
   */
  public getState(): ICoverStateInfo {
    return {
      state: this._coverState,
      position: this._position,
      tiltPosition: this._tiltPosition,
    };
  }

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

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

  /**
   * Internal state update
   */
  private updateStateInternal(state: ICoverStateInfo): void {
    this._coverState = state.state;
    this._position = state.position;
    this._tiltPosition = state.tiltPosition;
  }

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

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