import { api } from './api';
import type { UserInfo, LoginRequest, LoginResponse } from '@/types/user';
import type { ApiResponse } from '@/types/common';

/**
 * Token 存储键名
 */
const TOKEN_KEY = 'access_token';
const USER_KEY = 'user_info';

/**
 * 认证服务
 */
class AuthService {
    /**
     * 登录
     */
    async login(credentials: LoginRequest): Promise<LoginResponse> {
        const response = await api.post<ApiResponse<LoginResponse>>('/auth/login', credentials);

        if (response.code === 0 && response.data) {
            this.setToken(response.data.accessToken);
            this.setUser(response.data.user);
            return response.data;
        }

        throw new Error(response.message || '登录失败');
    }

    /**
     * 登出
     */
    logout(): void {
        this.removeToken();
        this.removeUser();
    }

    /**
     * 获取当前 token
     */
    getToken(): string | null {
        return localStorage.getItem(TOKEN_KEY);
    }

    /**
     * 设置 token
     */
    setToken(token: string): void {
        localStorage.setItem(TOKEN_KEY, token);
    }

    /**
     * 移除 token
     */
    removeToken(): void {
        localStorage.removeItem(TOKEN_KEY);
    }

    /**
     * 获取当前用户信息
     */
    getUser(): UserInfo | null {
        const userStr = localStorage.getItem(USER_KEY);
        if (!userStr) return null;

        try {
            return JSON.parse(userStr);
        } catch {
            return null;
        }
    }

    /**
     * 设置用户信息
     */
    setUser(user: UserInfo): void {
        localStorage.setItem(USER_KEY, JSON.stringify(user));
    }

    /**
     * 移除用户信息
     */
    removeUser(): void {
        localStorage.removeItem(USER_KEY);
    }

    /**
     * 检查是否已登录
     */
    isAuthenticated(): boolean {
        return !!this.getToken();
    }

    /**
     * 检查是否为管理员
     */
    isAdmin(): boolean {
        const user = this.getUser();
        return user?.role === 'admin' || user?.role === 'super_admin';
    }
}

// 导出单例
export const authService = new AuthService();