/**
 * CmdCode V0.5 - 聊天引擎工厂
 * 根据配置自动选择 EnhancedChatEngine 或 ChatEngine
 */
import { ChatEngine, type Message } from './chat.js'
import { EnhancedChatEngine, setPAVREnabled, type Message as PAVRMessage } from './chat-enhanced.js'
import type { Config } from './config.js'

export { setPAVREnabled, isPAVREnabled } from './chat-enhanced.js'

/** 全局开关 */
let globalPAVREnabled = true

export function setGlobalPAVREnabled(enabled: boolean): void {
  globalPAVREnabled = enabled
  setPAVREnabled(enabled)
}

export function isGlobalPAVREnabled(): boolean {
  return globalPAVREnabled
}

/**
 * 创建聊天引擎（兼容 API）
 * 
 * @param usePAVR - 是否使用 PAVR 循环（默认使用全局设置）
 * @param config - 配置
 * @param systemPrompt - 系统提示词
 * @param workspaceDir - 工作目录
 */
export function createChatEngine(
  usePAVR?: boolean,
  config?: Config,
  systemPrompt?: string,
  workspaceDir?: string
): ChatEngine | EnhancedChatEngine {
  const shouldUsePAVR = usePAVR ?? globalPAVREnabled
  
  if (shouldUsePAVR) {
    setPAVREnabled(true)
    return new EnhancedChatEngine(config, systemPrompt, workspaceDir)
  } else {
    setPAVREnabled(false)
    return new ChatEngine(config, systemPrompt, workspaceDir)
  }
}

/**
 * 从历史记录创建聊天引擎（兼容 API）
 */
export function createChatEngineFromHistory(
  messages: Message[],
  usePAVR?: boolean,
  config?: Config,
  workspaceDir?: string
): ChatEngine | EnhancedChatEngine {
  const shouldUsePAVR = usePAVR ?? globalPAVREnabled
  
  if (shouldUsePAVR) {
    setPAVREnabled(true)
    return EnhancedChatEngine.fromHistory(messages, config, workspaceDir)
  } else {
    setPAVREnabled(false)
    return ChatEngine.fromHistory(messages, config, workspaceDir)
  }
}

// 导出类型
export type { Message } from './chat.js'
export type { PAVRMessage as EnhancedMessage, PAVRState } from './chat-enhanced.js'