//
//  LoginState.swift
//  punchnet
//
//  Created by 安礼成 on 2026/1/16.
//

import Foundation
import Observation

@Observable
class UserContext {
    var loginCredit: Credit?
    var networkSession: SDLAPIClient.NetworkSession?
    
    enum Credit {
        case token(token: String)
        case accountAndPasword(account: String, password: String)
    }
    
    func loginWith(credit: Credit) async throws -> Bool {
        switch credit {
        case .token(let token):
            self.networkSession = try await SDLAPIClient.loginWithToken(token: token)
            // 将数据缓存到keychain
            if let data = token.data(using: .utf8) {
                try KeychainStore.shared.save(data, account: "token")
            }
        case .accountAndPasword(let username, let password):
            self.networkSession = try await SDLAPIClient.loginWithAccountAndPassword(username: username, password: password)
            // 将数据缓存到keychain
            if let data = "\(username):\(password)".data(using: .utf8) {
                try KeychainStore.shared.save(data, account: "accountAndPasword")
            }
        }
        self.loginCredit = credit
        
        return true
    }
    
    func loadCacheToken() -> String? {
        if let data = try? KeychainStore.shared.load(account: "token") {
            return String(data: data, encoding: .utf8)
        }
        return nil
    }
    
    func loadCacheUsernameAndPassword() -> (String, String)? {
        if let data = try? KeychainStore.shared.load(account: "accountAndPasword"),
            let str = String(data: data, encoding: .utf8) {
            let parts = str.split(separator: ":")
            if parts.count == 2 {
                return (String(parts[0]), String(parts[1]))
            }
        }
        return nil
    }
    
    // 退出登陆
    func logout() async throws {
        try await VPNManager.shared.disableVpn()
    }
    
}