import { GoogleGenAI } from "@google/genai";
import { RoleConfig } from "./RoleConfig";

// API配置
const API_CONFIG = {
    apiKey: "AIzaSyBJT_68Fc-sKPp_lYSbQmDck0otsd3uKn8",
    model: "gemini-2.5-flash",
    temperature: 0.7
};

/**
 * AI聊天服务
 * 管理多个独立的聊天实例，每个角色有独立的对话上下文
 */
export class ChatAIService {
    private static _instance: ChatAIService;
    private ai: GoogleGenAI;
    private chatInstances: Map<number, any> = new Map();
    private currentRoleId: number | null = null;

    private constructor() {
        this.ai = new GoogleGenAI({ apiKey: API_CONFIG.apiKey });
    }

    /**
     * 获取单例实例
     */
    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 = RoleConfig.getRoleInstruction(roleId);
            const chat = this.ai.chats.create({
                model: API_CONFIG.model,
                config: {
                    temperature: API_CONFIG.temperature,
                    systemInstruction: systemInstruction

                },
            });
            this.chatInstances.set(roleId, chat);
            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);
    }

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

    /**
     * 发送消息到AI
     * @param roleId 角色ID
     * @param message 用户消息
     */
    public async sendMessage(roleId: number, message: string): Promise<string> {
        try {
            const chat = this.createOrGetChat(roleId);
            const response = await chat.sendMessage({
                message: message
            });

            if (response && response.text) {
                console.log(`Response from role ${roleId}:`, response.text);
                return response.text;
            } else {
                console.warn(`Empty response from role ${roleId}`);
                return null;
            }
        } catch (error) {
            console.error(`Error sending message to role ${roleId}:`, error);
            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);
            console.log(`Cleared chat history for role ${roleId}`);
        }
    }

    /**
     * 清除所有聊天历史
     */
    public clearAllChatHistory(): void {
        this.chatInstances.clear();
        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
     */
    public async Post(data: GPTRequest): Promise<string> {
        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
export type GPTResquest = GPTRequest;

// 响应数据类型定义（保留以备后用）
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;
    }[];
}