18xchat/assets/Scripts/chat18x/core/ChatAIService.ts

// 首先加载 polyfills 以确保兼容性
import "../utils/polyfills";
import { GoogleGenAI, HarmBlockThreshold, HarmCategory } from "@google/genai";
import { RoleConfigLoader } from "./RoleConfigLoader";
import { ChatHistoryManager } from "../manager/ChatHistoryManager";
import { ApiConfig } from "./ApiConfigLoader";
import { ErrorHandler, ErrorType } from "../utils/ErrorHandler";
import { EmotionAIService } from "./EmotionAIService";

/**
 * AI聊天服务类
 *
 * 基于Google Gemini API实现的多角色聊天系统，支持：
 * - 多个独立的聊天实例管理
 * - 每个角色拥有独立的对话上下文和历史记录
 * - 本地聊天历史存储和加载
 * - 动态角色配置和切换
 *
 * @example
 * ```typescript
 * const chatService = ChatAIService.Instance;
 * chatService.setCurrentRole(10001);
 * const response = await chatService.sendMessage(10001, "Hello");
 * ```
 *
 * @author AI Chat System
 * @version 2.0.0
 */
export class ChatAIService {
  private static _instance: ChatAIService;
  private ai: GoogleGenAI;
  private chatInstances: Map<number, any> = new Map();
  private currentRoleId: number | null = null;

  private constructor() {
    const config = ApiConfig.Instance.getAIConfig();

    // 验证配置
    if (!ApiConfig.Instance.validateConfig()) {
      ErrorHandler.Instance.handleError(
        new Error("AI配置验证失败"),
        ErrorType.CONFIG_ERROR,
        { config },
        true
      );
      throw new Error("AI服务初始化失败：配置无效");
    }

    try {
      this.ai = new GoogleGenAI({ apiKey: config.apiKey });
    } catch (error) {
      ErrorHandler.Instance.handleError(
        error as Error,
        ErrorType.API_ERROR,
        { config: { ...config, apiKey: "***" } }, // 隐藏API密钥
        true
      );
      throw error;
    }
  }

  /**
   * 获取ChatAIService的单例实例
   *
   * @returns {ChatAIService} 聊天服务实例
   * @static
   */
  public static get Instance(): ChatAIService {
    if (!this._instance) {
      this._instance = new ChatAIService();
    }
    return this._instance;
  }

  /**
   * 创建或获取指定角色的聊天实例
   * @param roleId 角色ID
   */
  private createOrGetChat(roleId: number): any {
    if (!this.chatInstances.has(roleId)) {
      const systemInstruction = RoleConfigLoader.getRoleInstruction(roleId);
      const config = ApiConfig.Instance.getAIConfig();

      // 从本地加载历史记录
      const savedHistory = ChatHistoryManager.Instance.loadHistory(roleId);
      let chat;
      if (savedHistory && savedHistory.length > 0) {
        chat = this.ai.chats.create({
          model: config.model,
          config: {
            temperature: config.temperature,
            systemInstruction: systemInstruction,
            safetySettings: [
              {
                category: HarmCategory.HARM_CATEGORY_SEXUALLY_EXPLICIT,
                threshold: HarmBlockThreshold.BLOCK_NONE,
              },
            ],
          },
          history: savedHistory,
        });
      } else {
        chat = this.ai.chats.create({
          model: config.model,
          config: {
            temperature: config.temperature,
            systemInstruction: systemInstruction,
            safetySettings: [
              {
                category: HarmCategory.HARM_CATEGORY_SEXUALLY_EXPLICIT,
                threshold: HarmBlockThreshold.BLOCK_NONE,
              },
            ],
          },
        });
      }

      this.chatInstances.set(roleId, chat);

      if (savedHistory.length > 0) {
        console.log(
          `Loaded ${savedHistory.length} history messages for role ${roleId}`
        );
      } else {
        console.log(`Created new chat instance for role ${roleId}`);
      }
    }
    return this.chatInstances.get(roleId);
  }

  /**
   * 设置当前活动的角色ID
   * @param roleId 角色ID
   */
  public setCurrentRole(roleId: number): void {
    this.currentRoleId = roleId;
    // 预创建聊天实例
    this.createOrGetChat(roleId);
    // 预创建情绪聊天实例
    EmotionAIService.Instance.ensureEmotionChatExists(roleId);
  }

  /**
   * 获取当前角色ID
   */
  public getCurrentRoleId(): number | null {
    return this.currentRoleId;
  }

  /**
   * 向指定角色发送消息并获取AI回复
   *
   * @param {number} roleId - 角色ID，用于区分不同的聊天实例
   * @param {string} message - 用户发送的消息内容
   * @returns {Promise<string>} AI的回复消息，如果发生错误返回null
   *
   * @example
   * ```typescript
   * const response = await chatService.sendMessage(10001, "你好");
   * console.log(response); // AI的回复
   * ```
   */
  public async sendMessage(roleId: number, message: string): Promise<string> {
    // 输入验证
    if (!roleId || roleId <= 0) {
      ErrorHandler.Instance.handleValidationError(
        "roleId",
        "角色ID必须是正整数",
        roleId
      );
      return null;
    }

    if (!message || message.trim() === "") {
      ErrorHandler.Instance.handleValidationError(
        "message",
        "消息内容不能为空",
        message
      );
      return null;
    }

    try {
      const chat = this.createOrGetChat(roleId);
      const response = await chat.sendMessage({
        message: message.trim(),
      });

      if (response && response.text) {
        console.log(`Response from role ${roleId}:`, response.text);

        try {
          // 保存用户消息
          ChatHistoryManager.Instance.appendMessage(roleId, {
            role: "user",
            parts: [{ text: message }],
          });

          // 保存AI回复
          ChatHistoryManager.Instance.appendMessage(roleId, {
            role: "model",
            parts: [{ text: response.text }],
          });

          // 异步更新情绪状态（非阻塞）
          EmotionAIService.Instance.updateEmotionFromChat(
            roleId,
            message,
            response.text
          ).catch(emotionError => {
            console.warn(
              `Failed to update emotion for role ${roleId}:`,
              emotionError
            );
            // 情绪更新失败不影响聊天功能
          });
        } catch (storageError) {
          ErrorHandler.Instance.handleError(
            storageError as Error,
            ErrorType.STORAGE_ERROR,
            { roleId, message: message.substring(0, 100) },
            false
          );
          // 即使存储失败，也返回AI回复
        }

        return response.text;
      } else {
        const warningMsg = `AI返回了空响应 (角色ID: ${roleId})`;
        ErrorHandler.Instance.handleError(
          new Error(warningMsg),
          ErrorType.API_ERROR,
          { roleId, chat, response },
          true
        );
        return null;
      }
    } catch (error) {
      ErrorHandler.Instance.handleApiError(error, "sendMessage", {
        roleId,
        message: message.substring(0, 100) + "...",
      });
      return null;
    }
  }

  /**
   * 清除指定角色的聊天历史
   * @param roleId 角色ID
   */
  public clearChatHistory(roleId: number): void {
    if (this.chatInstances.has(roleId)) {
      this.chatInstances.delete(roleId);
    }
    // 清除情绪聊天历史
    EmotionAIService.Instance.clearEmotionHistory(roleId);
    // 清除本地存储的历史
    ChatHistoryManager.Instance.clearHistory(roleId);
    console.log(`Cleared chat history for role ${roleId}`);
  }

  /**
   * 清除所有聊天历史
   */
  public clearAllChatHistory(): void {
    this.chatInstances.clear();
    // 清除所有情绪聊天历史
    EmotionAIService.Instance.clearAllEmotionHistory();
    // 清除本地存储的所有历史
    ChatHistoryManager.Instance.clearAllHistory();
    console.log("Cleared all chat histories");
  }

  /**
   * 获取当前活跃的聊天实例数量
   */
  public getActiveChatCount(): number {
    return this.chatInstances.size;
  }

  /**
   * 兼容旧接口的Post方法
   * @deprecated 请使用sendMessage方法，此方法将在下个版本中移除
   */
  public async Post(data: GPTRequest): Promise<string> {
    console.warn("Post方法已废弃，请使用sendMessage方法");
    const roleId = this.currentRoleId || 10001; // 默认使用第一个角色
    const message = data.messages[0]?.content || "";
    return this.sendMessage(roleId, message);
  }
}

// 请求数据类型定义
export interface GPTRequest {
  model: string;
  messages: { role: string; content: string }[];
  temperature: number;
  id: string;
}

// 兼容旧名称（已废弃，建议使用 GPTRequest）
/** @deprecated 请使用 GPTRequest */
export type GPTResquest = GPTRequest;

// 响应数据类型定义（当前未使用，预留用于未来API调用统计）
/** @deprecated 当前未使用，考虑移除或实现API统计功能时使用 */
export interface GPTResult {
  id: string;
  object: string;
  created: number;
  model: string;
  usage: {
    prompt_tokens: number;
    completion_tokens: number;
    total_tokens: number;
  };
  choices: {
    message: {
      role: string;
      content: string;
    };
    finish_reason: string;
    index: number;
  }[];
}