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suixinkan/Features/Auth/ViewModels/LoginViewModel.swift

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+//
+//  LoginViewModel.swift
+//  suixinkan
+//
+//  Created by Codex on 2026/6/18.
+//
+
+import Foundation
+import Observation
+
+/// 登录输入焦点实体，标识当前需要聚焦的输入框。
+enum LoginField: Hashable {
+    case username
+    case password
+}
+
+/// 登录表单校验错误实体，负责提供用户提示和焦点位置。
+enum LoginValidationError: Equatable {
+    case invalidPhone
+    case emptyPassword
+    case privacyUnchecked
+
+    var message: String {
+        switch self {
+        case .invalidPhone:
+            "请输入有效的手机号码"
+        case .emptyPassword:
+            "请输入密码"
+        case .privacyUnchecked:
+            "请先阅读并同意相关协议"
+        }
+    }
+
+    var focusField: LoginField? {
+        switch self {
+        case .invalidPhone:
+            .username
+        case .emptyPassword:
+            .password
+        case .privacyUnchecked:
+            nil
+        }
+    }
+}
+
+/// 登录结果实体，区分已完成登录和需要用户选择账号两种情况。
+enum LoginResolution {
+    case completed(V9AuthResponse)
+    case needsAccountSelection(AccountSelectionPayload)
+}
+
+/// 登录流程错误实体，表示 token、账号列表或账号 ID 异常。
+enum LoginFlowError: LocalizedError {
+    case missingToken
+    case noAvailableAccount
+    case invalidAccount
+
+    var errorDescription: String? {
+        switch self {
+        case .missingToken:
+            "登录响应缺少 token"
+        case .noAvailableAccount:
+            "当前账号没有可用的景区账号或门店账号，请联系管理员"
+        case .invalidAccount:
+            "账号信息异常，请重新选择账号"
+        }
+    }
+}
+
+@MainActor
+@Observable
+/// 登录页 ViewModel，负责表单状态、登录请求和多账号选择流程。
+final class LoginViewModel {
+    var username = "18651857230"
+    var password = "zhifly666"
+    var privacyChecked = false
+    var isLoading = false
+    var isSelectingAccount = false
+    var showsPassword = false
+    var showsAgreementSheet = false
+    var pendingAccountSelection: AccountSelectionPayload?
+
+    var canSubmit: Bool {
+        isValidPhone && !trimmedPassword.isEmpty
+    }
+
+    var trimmedPassword: String {
+        password.trimmingCharacters(in: .whitespacesAndNewlines)
+    }
+
+    var normalizedUsername: String {
+        normalizedPhoneNumber(username)
+    }
+
+    var isValidPhone: Bool {
+        normalizedUsername.count == 11 && normalizedUsername.first == "1"
+    }
+
+    /// 应用本地登录偏好，只恢复手机号和协议状态，不恢复密码。
+    func applyPreferences(_ preferences: LoginPreferences) {
+        if username.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty,
+           let lastUsername = preferences.lastUsername {
+            username = lastUsername
+        }
+        privacyChecked = preferences.privacyAgreementAccepted
+    }
+
+    /// 校验登录表单，并返回第一个需要处理的错误。
+    func validateForLogin() -> LoginValidationError? {
+        guard isValidPhone else {
+            return .invalidPhone
+        }
+        guard !trimmedPassword.isEmpty else {
+            return .emptyPassword
+        }
+        guard privacyChecked else {
+            return .privacyUnchecked
+        }
+        return nil
+    }
+
+    /// 用户同意协议后关闭协议确认弹窗。
+    func acceptAgreement() {
+        privacyChecked = true
+        showsAgreementSheet = false
+    }
+
+    /// 当输入包含 +86 前缀时，把手机号规范化为 11 位国内手机号。
+    func normalizeUsernameCountryCodeIfNeeded() {
+        let digits = username.filter(\.isNumber)
+        let normalizedPhone = normalizedPhoneNumber(username)
+        guard normalizedPhone != digits, normalizedPhone.count == 11 else { return }
+        username = normalizedPhone
+    }
+
+    /// 发起登录，并根据账号数量决定直接完成或进入账号选择。
+    func login(authAPI: AuthAPI) async throws -> LoginResolution {
+        guard !isLoading else {
+            throw CancellationError()
+        }
+
+        isLoading = true
+        defer { isLoading = false }
+
+        let response = try await authAPI.login(
+            username: normalizedUsername,
+            password: trimmedPassword
+        )
+        return try await resolveLoginResponse(response, authAPI: authAPI)
+    }
+
+    /// 选择一个账号并调用 set-user 换取正式 token。
+    func selectAccount(_ account: AccountSwitchAccount, authAPI: AuthAPI) async throws -> V9AuthResponse {
+        guard let payload = pendingAccountSelection, payload.hasTempToken else {
+            throw LoginFlowError.missingToken
+        }
+        guard account.businessUserId > 0 else {
+            throw LoginFlowError.invalidAccount
+        }
+        guard !isSelectingAccount else {
+            throw CancellationError()
+        }
+
+        isSelectingAccount = true
+        defer { isSelectingAccount = false }
+
+        let response = try await authAPI.setUser(account.toSetUserRequest(), tokenOverride: payload.tempToken)
+        guard !response.token.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty else {
+            throw LoginFlowError.missingToken
+        }
+        pendingAccountSelection = nil
+        return response
+    }
+
+    /// 清空待选账号信息，通常在用户取消账号选择时调用。
+    func clearPendingAccountSelection() {
+        pendingAccountSelection = nil
+    }
+
+    /// 解析登录响应，单账号自动 set-user，多账号保留选择载荷。
+    private func resolveLoginResponse(_ response: V9AuthResponse, authAPI: AuthAPI) async throws -> LoginResolution {
+        let token = response.token.trimmingCharacters(in: .whitespacesAndNewlines)
+        guard !token.isEmpty else {
+            throw LoginFlowError.missingToken
+        }
+
+        let accounts = response.accounts.filter { $0.businessUserId > 0 }
+        guard !accounts.isEmpty else {
+            throw LoginFlowError.noAvailableAccount
+        }
+
+        if accounts.count == 1, let account = accounts.first {
+            let finalResponse = try await authAPI.setUser(account.toSetUserRequest(), tokenOverride: token)
+            guard !finalResponse.token.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty else {
+                throw LoginFlowError.missingToken
+            }
+            return .completed(finalResponse)
+        }
+
+        let payload = AccountSelectionPayload(tempToken: token, accounts: accounts)
+        pendingAccountSelection = payload
+        return .needsAccountSelection(payload)
+    }
+
+    /// 过滤手机号中的非数字字符，并去掉 86 国家码前缀。
+    private func normalizedPhoneNumber(_ value: String) -> String {
+        var digits = value.filter(\.isNumber)
+        if digits.hasPrefix("86"), digits.count == 13 {
+            digits.removeFirst(2)
+        }
+        return digits
+    }
+}