/**
 * Climate Feature
 * Provides control for thermostats and HVAC systems
 */

import { Feature, type TDeviceReference } from './feature.abstract.js';
import type { IFeatureOptions } from '../interfaces/feature.interfaces.js';
import type {
  TClimateProtocol,
  THvacMode,
  THvacAction,
  IClimateCapabilities,
  IClimateState,
  IClimateFeatureInfo,
  IClimateProtocolClient,
} from '../interfaces/smarthome.interfaces.js';

/**
 * Options for creating a ClimateFeature
 */
export interface IClimateFeatureOptions extends IFeatureOptions {
  /** Protocol type */
  protocol: TClimateProtocol;
  /** Entity ID (for Home Assistant) */
  entityId: string;
  /** Protocol client for controlling the climate device */
  protocolClient: IClimateProtocolClient;
  /** Climate capabilities */
  capabilities?: Partial<IClimateCapabilities>;
}

/**
 * Climate Feature - thermostat and HVAC control
 *
 * Protocol-agnostic: works with Home Assistant, Nest, Ecobee, MQTT, etc.
 *
 * @example
 * ```typescript
 * const climate = device.getFeature<ClimateFeature>('climate');
 * if (climate) {
 *   await climate.setHvacMode('heat');
 *   await climate.setTargetTemp(21);
 *   console.log(`Current: ${climate.currentTemp}°C, Target: ${climate.targetTemp}°C`);
 * }
 * ```
 */
export class ClimateFeature extends Feature {
  public readonly type = 'climate' as const;
  public readonly protocol: TClimateProtocol;

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

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

  /** Current state */
  protected _currentTemp?: number;
  protected _targetTemp?: number;
  protected _targetTempHigh?: number;
  protected _targetTempLow?: number;
  protected _hvacMode: THvacMode = 'off';
  protected _hvacAction?: THvacAction;
  protected _presetMode?: string;
  protected _fanMode?: string;
  protected _swingMode?: string;
  protected _humidity?: number;
  protected _targetHumidity?: number;
  protected _auxHeat?: boolean;

  /** Protocol client for controlling the climate device */
  private protocolClient: IClimateProtocolClient;

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

    this.capabilities = {
      hvacModes: options.capabilities?.hvacModes ?? ['off', 'heat', 'cool', 'auto'],
      presetModes: options.capabilities?.presetModes,
      fanModes: options.capabilities?.fanModes,
      swingModes: options.capabilities?.swingModes,
      supportsTargetTemp: options.capabilities?.supportsTargetTemp ?? true,
      supportsTargetTempRange: options.capabilities?.supportsTargetTempRange ?? false,
      supportsHumidity: options.capabilities?.supportsHumidity ?? false,
      supportsAuxHeat: options.capabilities?.supportsAuxHeat ?? false,
      minTemp: options.capabilities?.minTemp ?? 7,
      maxTemp: options.capabilities?.maxTemp ?? 35,
      tempStep: options.capabilities?.tempStep ?? 0.5,
      minHumidity: options.capabilities?.minHumidity,
      maxHumidity: options.capabilities?.maxHumidity,
    };
  }

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

  /**
   * Get current temperature (cached)
   */
  public get currentTemp(): number | undefined {
    return this._currentTemp;
  }

  /**
   * Get target temperature (cached)
   */
  public get targetTemp(): number | undefined {
    return this._targetTemp;
  }

  /**
   * Get target temperature high (for heat_cool mode, cached)
   */
  public get targetTempHigh(): number | undefined {
    return this._targetTempHigh;
  }

  /**
   * Get target temperature low (for heat_cool mode, cached)
   */
  public get targetTempLow(): number | undefined {
    return this._targetTempLow;
  }

  /**
   * Get current HVAC mode (cached)
   */
  public get hvacMode(): THvacMode {
    return this._hvacMode;
  }

  /**
   * Get current HVAC action (cached)
   */
  public get hvacAction(): THvacAction | undefined {
    return this._hvacAction;
  }

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

  /**
   * Get current fan mode (cached)
   */
  public get fanMode(): string | undefined {
    return this._fanMode;
  }

  /**
   * Get current swing mode (cached)
   */
  public get swingMode(): string | undefined {
    return this._swingMode;
  }

  /**
   * Get current humidity (cached)
   */
  public get humidity(): number | undefined {
    return this._humidity;
  }

  /**
   * Get target humidity (cached)
   */
  public get targetHumidity(): number | undefined {
    return this._targetHumidity;
  }

  /**
   * Get aux heat state (cached)
   */
  public get auxHeat(): boolean | undefined {
    return this._auxHeat;
  }

  /**
   * Get available HVAC modes
   */
  public get hvacModes(): THvacMode[] {
    return this.capabilities.hvacModes;
  }

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

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

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

  // ============================================================================
  // Climate Control
  // ============================================================================

  /**
   * Set HVAC mode
   * @param mode HVAC mode (off, heat, cool, etc.)
   */
  public async setHvacMode(mode: THvacMode): Promise<void> {
    if (!this.capabilities.hvacModes.includes(mode)) {
      throw new Error(`HVAC mode ${mode} not supported`);
    }

    await this.protocolClient.setHvacMode(this.entityId, mode);
    this._hvacMode = mode;
    this.emit('state:changed', this.getState());
  }

  /**
   * Set target temperature
   * @param temp Target temperature
   */
  public async setTargetTemp(temp: number): Promise<void> {
    if (!this.capabilities.supportsTargetTemp) {
      throw new Error('Climate device does not support target temperature');
    }

    const clamped = Math.max(
      this.capabilities.minTemp,
      Math.min(this.capabilities.maxTemp, temp)
    );

    await this.protocolClient.setTargetTemp(this.entityId, clamped);
    this._targetTemp = clamped;
    this.emit('state:changed', this.getState());
  }

  /**
   * Set target temperature range (for heat_cool mode)
   * @param low Low temperature
   * @param high High temperature
   */
  public async setTargetTempRange(low: number, high: number): Promise<void> {
    if (!this.capabilities.supportsTargetTempRange) {
      throw new Error('Climate device does not support temperature range');
    }

    const clampedLow = Math.max(this.capabilities.minTemp, Math.min(this.capabilities.maxTemp, low));
    const clampedHigh = Math.max(this.capabilities.minTemp, Math.min(this.capabilities.maxTemp, high));

    await this.protocolClient.setTargetTempRange(this.entityId, clampedLow, clampedHigh);
    this._targetTempLow = clampedLow;
    this._targetTempHigh = clampedHigh;
    this.emit('state:changed', this.getState());
  }

  /**
   * Set preset mode
   * @param preset Preset mode name
   */
  public async setPresetMode(preset: string): Promise<void> {
    if (!this.capabilities.presetModes?.includes(preset)) {
      throw new Error(`Preset mode ${preset} not supported`);
    }

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

  /**
   * Set fan mode
   * @param mode Fan mode name
   */
  public async setFanMode(mode: string): Promise<void> {
    if (!this.capabilities.fanModes?.includes(mode)) {
      throw new Error(`Fan mode ${mode} not supported`);
    }

    await this.protocolClient.setFanMode(this.entityId, mode);
    this._fanMode = mode;
    this.emit('state:changed', this.getState());
  }

  /**
   * Set swing mode
   * @param mode Swing mode name
   */
  public async setSwingMode(mode: string): Promise<void> {
    if (!this.capabilities.swingModes?.includes(mode)) {
      throw new Error(`Swing mode ${mode} not supported`);
    }

    await this.protocolClient.setSwingMode(this.entityId, mode);
    this._swingMode = mode;
    this.emit('state:changed', this.getState());
  }

  /**
   * Set aux heat
   * @param enabled Whether aux heat is enabled
   */
  public async setAuxHeat(enabled: boolean): Promise<void> {
    if (!this.capabilities.supportsAuxHeat) {
      throw new Error('Climate device does not support aux heat');
    }

    await this.protocolClient.setAuxHeat(this.entityId, enabled);
    this._auxHeat = enabled;
    this.emit('state:changed', this.getState());
  }

  /**
   * Get current state as object
   */
  public getState(): IClimateState {
    return {
      currentTemp: this._currentTemp,
      targetTemp: this._targetTemp,
      targetTempHigh: this._targetTempHigh,
      targetTempLow: this._targetTempLow,
      hvacMode: this._hvacMode,
      hvacAction: this._hvacAction,
      presetMode: this._presetMode,
      fanMode: this._fanMode,
      swingMode: this._swingMode,
      humidity: this._humidity,
      targetHumidity: this._targetHumidity,
      auxHeat: this._auxHeat,
    };
  }

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

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

  /**
   * Internal state update
   */
  private updateStateInternal(state: IClimateState): void {
    this._currentTemp = state.currentTemp;
    this._targetTemp = state.targetTemp;
    this._targetTempHigh = state.targetTempHigh;
    this._targetTempLow = state.targetTempLow;
    this._hvacMode = state.hvacMode;
    this._hvacAction = state.hvacAction;
    this._presetMode = state.presetMode;
    this._fanMode = state.fanMode;
    this._swingMode = state.swingMode;
    this._humidity = state.humidity;
    this._targetHumidity = state.targetHumidity;
    this._auxHeat = state.auxHeat;
  }

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

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