//
//  AccountDeletionModels.swift
//  suixinkan
//

import Foundation

/// 注销核验资产，使用中性文案展示当前账号拥有的数据与权益。
struct AccountDeletionAssetSummary: Codable, Hashable, Sendable {

    /// 注销核验覆盖的资产类型。
    enum Kind: String, Codable, CaseIterable, Sendable {
        case wallet
        case works
        case projects
        case cloudFiles
    }

    let kind: Kind
    let title: String
    let valueText: String
}

/// 注销前置核验结果，包含资产快照和注销影响说明。
struct AccountDeletionPrecheck: Equatable, Sendable {
    let assets: [AccountDeletionAssetSummary]
    let consequences: [String]
}

/// 注销申请当前状态。
enum AccountDeletionRequestStatus: String, Codable, Sendable {
    case pending
    case canceled
    case completed
}

/// 注销申请记录，保存7天冷静期及用户确认的资产范围。
struct AccountDeletionRequest: Codable, Equatable, Sendable {
    let id: UUID
    let clientRequestID: UUID
    let username: String
    let submittedAt: Date
    let scheduledDeletionAt: Date
    var status: AccountDeletionRequestStatus
    let acknowledgedAssetKinds: [AccountDeletionAssetSummary.Kind]
}

/// 登录时需要处理的注销状态。
enum AccountDeletionLoginState: Equatable, Sendable {
    case none
    case pending(AccountDeletionRequest)
    case completed(AccountDeletionRequest)
}

/// 注销短信验证页所需的稳定上下文。
struct AccountDeletionVerificationContext: Equatable, Sendable {
    let username: String
    let maskedPhone: String
    let assets: [AccountDeletionAssetSummary]
}

/// 注销业务错误，统一提供可直接展示的中文提示。
enum AccountDeletionError: LocalizedError, Equatable {
    case missingIdentity
    case invalidVerificationCode
    case incompleteAcknowledgement
    case noPendingRequest
    case cancellationExpired
    case deletionCompleted
    case persistenceFailed

    var errorDescription: String? {
        switch self {
        case .missingIdentity:
            "当前登录账号缺少手机号，暂时无法提交注销"
        case .invalidVerificationCode:
            "验证码错误，请输入演示验证码 123456"
        case .incompleteAcknowledgement:
            "请先确认已了解全部资产和注销后果"
        case .noPendingRequest:
            "当前账号没有待取消的注销申请"
        case .cancellationExpired:
            "7天取消期限已过，无法恢复账号"
        case .deletionCompleted:
            "账号已完成注销，无法继续登录"
        case .persistenceFailed:
            "注销状态保存失败，请稍后重试"
        }
    }
}

/// 注销账号身份工具，统一手机号规范化、掩码和当前登录身份解析。
enum AccountDeletionIdentity {

    /// 从当前会话读取登录手机号，优先使用登录页保存的原始账号。
    static func currentUsername(session: AppSessionStore = AppStore.shared.session) -> String? {
        let candidates = [session.lastLoginUsername, session.phone]
        return candidates
            .compactMap { $0 }
            .map(normalizedUsername)
            .first { !$0.isEmpty }
    }

    /// 将手机号账号规范化为纯数字，并兼容 +86 前缀。
    static func normalizedUsername(_ value: String) -> String {
        var digits = value.filter(\.isNumber)
        if digits.hasPrefix("86"), digits.count == 13 {
            digits.removeFirst(2)
        }
        return digits
    }

    /// 将手机号转换为用于页面展示的脱敏格式。
    static func maskedPhone(_ value: String) -> String {
        let username = normalizedUsername(value)
        guard username.count == 11 else { return username }
        let start = username.prefix(3)
        let end = username.suffix(4)
        return "\(start)****\(end)"
    }
}

/// 注销时间格式化工具，统一成功页和登录恢复弹窗的中文时间。
enum AccountDeletionDateFormatter {

    /// 将服务端计划删除时间格式化为中文日期时间。
    static func displayText(_ date: Date) -> String {
        let formatter = DateFormatter()
        formatter.locale = Locale(identifier: "zh_CN")
        formatter.timeZone = TimeZone(identifier: "Asia/Shanghai")
        formatter.dateFormat = "yyyy年M月d日 HH:mm"
        return formatter.string(from: date)
    }
}