//
//  LoginViewModel.swift
//  suixinkan
//

import Foundation

/// 登录页 ViewModel，UI 状态与 Android `LoginViewModel` 对齐。
final class LoginViewModel {

    private(set) var account = ""
    private(set) var password = ""
    private(set) var isPrivacyChecked = false
    private(set) var enableRegister = false

    var isLoginEnabled: Bool {
        !account.isEmpty && !password.isEmpty
    }

    var onStateChange: (() -> Void)?

    func updateAccount(_ value: String) {
        account = value
        notifyStateChange()
    }

    func updatePassword(_ value: String) {
        password = value
        notifyStateChange()
    }

    func togglePrivacyChecked() {
        isPrivacyChecked.toggle()
        notifyStateChange()
    }

    func updateEnableRegister(_ enabled: Bool) {
        enableRegister = enabled
        notifyStateChange()
    }

    func login() {
        guard isPrivacyChecked else {
            onShowMessage?("请先阅读并同意用户协议与隐私政策")
            return
        }
        guard isLoginEnabled else { return }
        onLogin?()
    }

    var onShowMessage: ((String) -> Void)?
    var onLogin: (() -> Void)?
    var onLoginByCode: (() -> Void)?
    var onRegister: (() -> Void)?
    var onUserAgreement: (() -> Void)?
    var onPrivacyPolicy: (() -> Void)?

    private func notifyStateChange() {
        onStateChange?()
    }
}