/**
 * Camera Feature
 * Provides control for smart cameras (snapshots, streams)
 */

import { Feature, type TDeviceReference } from './feature.abstract.js';
import type { IFeatureOptions } from '../interfaces/feature.interfaces.js';
import type {
  TCameraProtocol,
  ICameraCapabilities,
  ICameraState,
  ICameraFeatureInfo,
  ICameraProtocolClient,
} from '../interfaces/smarthome.interfaces.js';

/**
 * Options for creating a CameraFeature
 */
export interface ICameraFeatureOptions extends IFeatureOptions {
  /** Protocol type */
  protocol: TCameraProtocol;
  /** Entity ID (for Home Assistant) */
  entityId: string;
  /** Protocol client for the camera */
  protocolClient: ICameraProtocolClient;
  /** Camera capabilities */
  capabilities?: Partial<ICameraCapabilities>;
}

/**
 * Camera Feature - snapshot and stream access
 *
 * Protocol-agnostic: works with Home Assistant, ONVIF, RTSP, etc.
 *
 * @example
 * ```typescript
 * const camera = device.getFeature<CameraFeature>('camera');
 * if (camera) {
 *   const snapshot = await camera.getSnapshot();
 *   const streamUrl = await camera.getStreamUrl();
 * }
 * ```
 */
export class CameraFeature extends Feature {
  public readonly type = 'camera' as const;
  public readonly protocol: TCameraProtocol;

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

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

  /** Current state */
  protected _isRecording: boolean = false;
  protected _isStreaming: boolean = false;
  protected _motionDetected: boolean = false;

  /** Protocol client for the camera */
  private protocolClient: ICameraProtocolClient;

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

    this.capabilities = {
      supportsStream: options.capabilities?.supportsStream ?? true,
      supportsPtz: options.capabilities?.supportsPtz ?? false,
      supportsSnapshot: options.capabilities?.supportsSnapshot ?? true,
      supportsMotionDetection: options.capabilities?.supportsMotionDetection ?? false,
      frontendStreamType: options.capabilities?.frontendStreamType,
      streamUrl: options.capabilities?.streamUrl,
    };
  }

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

  /**
   * Check if recording (cached)
   */
  public get isRecording(): boolean {
    return this._isRecording;
  }

  /**
   * Check if streaming (cached)
   */
  public get isStreaming(): boolean {
    return this._isStreaming;
  }

  /**
   * Check if motion detected (cached)
   */
  public get motionDetected(): boolean {
    return this._motionDetected;
  }

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

  // ============================================================================
  // Camera Access
  // ============================================================================

  /**
   * Get a snapshot image from the camera
   * @returns Buffer containing image data
   */
  public async getSnapshot(): Promise<Buffer> {
    if (!this.capabilities.supportsSnapshot) {
      throw new Error('Camera does not support snapshots');
    }

    return this.protocolClient.getSnapshot(this.entityId);
  }

  /**
   * Get snapshot URL
   * @returns URL for the snapshot image
   */
  public async getSnapshotUrl(): Promise<string> {
    if (!this.capabilities.supportsSnapshot) {
      throw new Error('Camera does not support snapshots');
    }

    return this.protocolClient.getSnapshotUrl(this.entityId);
  }

  /**
   * Get stream URL
   * @returns URL for the video stream
   */
  public async getStreamUrl(): Promise<string> {
    if (!this.capabilities.supportsStream) {
      throw new Error('Camera does not support streaming');
    }

    return this.protocolClient.getStreamUrl(this.entityId);
  }

  /**
   * Get current state as object
   */
  public getState(): ICameraState {
    return {
      isRecording: this._isRecording,
      isStreaming: this._isStreaming,
      motionDetected: this._motionDetected,
    };
  }

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

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

  /**
   * Internal state update
   */
  private updateStateInternal(state: ICameraState): void {
    this._isRecording = state.isRecording;
    this._isStreaming = state.isStreaming;
    this._motionDetected = state.motionDetected;
  }

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

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