import '../core/config/app_constants.dart';
import '../core/utils/money.dart';

class LicenseInfo {
  final int id;
  final String type; // trial | monthly | annual | lifetime
  final bool isActive;
  final int maxDevices;
  final DateTime? expiresAt;
  final String phase; // normal | grace | readonly | locked

  const LicenseInfo({
    required this.id,
    required this.type,
    required this.isActive,
    required this.maxDevices,
    required this.phase,
    this.expiresAt,
  });

  factory LicenseInfo.fromJson(Map<String, dynamic> json) {
    return LicenseInfo(
      id: (json['id'] as num?)?.toInt() ?? 0,
      type: json['type'] as String? ?? 'trial',
      isActive: json['is_active'] as bool? ?? false,
      maxDevices: (json['max_devices'] as num?)?.toInt() ??
          AppConstants.defaultMaxDevices,
      expiresAt: json['expires_at'] != null
          ? DateTime.tryParse(json['expires_at'] as String)?.toLocal()
          : null,
      phase: json['phase'] as String? ?? 'normal',
    );
  }

  String get typeLabel {
    switch (type) {
      case 'monthly':
        return '月度授权';
      case 'annual':
        return '年度授权';
      case 'lifetime':
        return '永久授权';
      default:
        return '试用版';
    }
  }

  bool get isExpired => expiresAt != null && DateTime.now().isAfter(expiresAt!);

  int? get daysRemaining {
    if (expiresAt == null) return null;
    final diff = expiresAt!.difference(DateTime.now()).inDays;
    return diff < 0 ? 0 : diff;
  }

  /// 已过期天数（未过期或永久授权返回 0）。
  int get daysExpired {
    if (expiresAt == null) return 0;
    final diff = DateTime.now().difference(expiresAt!).inDays;
    return diff < 0 ? 0 : diff;
  }

  bool get isReadOnlyPhase => phase == 'readonly' || phase == 'locked';
  bool get isLockedPhase => phase == 'locked';
  bool get needsAttention =>
      phase == 'grace' || phase == 'readonly' || phase == 'locked';
}

/// POST /license/purchase 响应：pay v2 收银台会话信息（render_type 多态）。
class PurchaseOrder {
  final String outTradeNo;
  final String renderType; // redirect | qr | ...
  final Map<String, dynamic> payload;
  final int amountMinor;
  final String currency;
  final String subject;

  const PurchaseOrder({
    required this.outTradeNo,
    required this.renderType,
    required this.payload,
    required this.amountMinor,
    required this.currency,
    required this.subject,
  });

  /// render_type == redirect 时的跳转链接（payload['url']）。
  String get redirectUrl => payload['url'] as String? ?? '';

  /// render_type == qr 时的二维码内容（payload['qr_content']）。
  String get qrContent => payload['qr_content'] as String? ?? '';

  /// 兼容旧字段：purchase_card.dart（Task 7 改造前）仍读 payUrl/amount。
  String get payUrl => redirectUrl;
  String get amount => yuanFromMinor(amountMinor);

  factory PurchaseOrder.fromJson(Map<String, dynamic> json) => PurchaseOrder(
        outTradeNo: json['out_trade_no'] as String? ?? '',
        renderType: json['render_type'] as String? ?? 'redirect',
        payload:
            (json['payload'] as Map?)?.cast<String, dynamic>() ?? const {},
        amountMinor: (json['amount_minor'] as num?)?.toInt() ?? 0,
        currency: json['currency'] as String? ?? 'CNY',
        subject: json['subject'] as String? ?? '',
      );
}

/// GET /license/purchase/:otn 响应：购买单状态（到账轮询用）。
class PurchaseStatusInfo {
  final String outTradeNo;
  final String status; // pending | paid | failed
  final int amountMinor;
  final String currency;
  final String amount; // Deprecated：后端 formatMinor 串回退，串失败时用 amountMinor
  final DateTime? paidAt;
  final DateTime? expiresAt; // 续期后的门店授权到期时间（仅 paid 时有值）

  const PurchaseStatusInfo({
    required this.outTradeNo,
    required this.status,
    required this.amountMinor,
    required this.currency,
    required this.amount,
    this.paidAt,
    this.expiresAt,
  });

  bool get isPaid => status == 'paid';

  /// 展示用金额：优先按 amount_minor 换算，退回旧 amount 串兜底。
  String get displayAmount =>
      amountMinor > 0 ? yuanFromMinor(amountMinor) : amount;

  factory PurchaseStatusInfo.fromJson(Map<String, dynamic> json) =>
      PurchaseStatusInfo(
        outTradeNo: json['out_trade_no'] as String? ?? '',
        status: json['status'] as String? ?? 'pending',
        amountMinor: (json['amount_minor'] as num?)?.toInt() ?? 0,
        currency: json['currency'] as String? ?? 'CNY',
        amount: json['amount'] as String? ?? '',
        paidAt: json['paid_at'] != null
            ? DateTime.tryParse(json['paid_at'] as String)?.toLocal()
            : null,
        expiresAt: json['expires_at'] != null
            ? DateTime.tryParse(json['expires_at'] as String)?.toLocal()
            : null,
      );
}

/// GET /license/purchases 列表项。
class PurchaseRecord {
  final String outTradeNo;
  final String productBizCode;
  final int amountMinor;
  final String currency;
  final String amount; // Deprecated：后端 formatMinor 串回退
  final String status; // pending | paid | failed
  final String payUrl;
  final String userName;
  final DateTime? createdAt;
  final DateTime? paidAt;
  final DateTime? renewedTo;

  const PurchaseRecord({
    required this.outTradeNo,
    required this.productBizCode,
    required this.amountMinor,
    required this.currency,
    required this.amount,
    required this.status,
    required this.payUrl,
    required this.userName,
    this.createdAt,
    this.paidAt,
    this.renewedTo,
  });

  bool get isPaid => status == 'paid';

  /// 展示用金额：优先按 amount_minor 换算，退回旧 amount 串兜底。
  String get displayAmount =>
      amountMinor > 0 ? yuanFromMinor(amountMinor) : amount;

  factory PurchaseRecord.fromJson(Map<String, dynamic> json) =>
      PurchaseRecord(
        outTradeNo: json['out_trade_no'] as String? ?? '',
        productBizCode: json['product_biz_code'] as String? ?? '',
        amountMinor: (json['amount_minor'] as num?)?.toInt() ?? 0,
        currency: json['currency'] as String? ?? 'CNY',
        amount: json['amount'] as String? ?? '',
        status: json['status'] as String? ?? 'pending',
        payUrl: json['pay_url'] as String? ?? '',
        userName: json['user_name'] as String? ?? '',
        // 服务端时间为 UTC（RFC3339 Z），展示前转本地时区（同 session.dart 惯例）
        createdAt: json['created_at'] != null
            ? DateTime.tryParse(json['created_at'] as String)?.toLocal()
            : null,
        paidAt: json['paid_at'] != null
            ? DateTime.tryParse(json['paid_at'] as String)?.toLocal()
            : null,
        renewedTo: json['renewed_to'] != null
            ? DateTime.tryParse(json['renewed_to'] as String)?.toLocal()
            : null,
      );
}

/// GET /license/purchases 汇总（订单管理 tab KPI）。
class PurchaseSummary {
  final int paidTotalMinor;
  final int paidCount;
  final int pendingCount;
  final int totalCount;

  const PurchaseSummary({
    required this.paidTotalMinor,
    required this.paidCount,
    required this.pendingCount,
    required this.totalCount,
  });

  factory PurchaseSummary.fromJson(Map<String, dynamic> json) =>
      PurchaseSummary(
        paidTotalMinor: (json['paid_total_minor'] as num?)?.toInt() ?? 0,
        paidCount: (json['paid_count'] as num?)?.toInt() ?? 0,
        pendingCount: (json['pending_count'] as num?)?.toInt() ?? 0,
        totalCount: (json['total_count'] as num?)?.toInt() ?? 0,
      );
}

/// GET /license/purchases 响应整体。
class PurchaseListResult {
  final List<PurchaseRecord> items;
  final int total;
  final PurchaseSummary summary;

  const PurchaseListResult({
    required this.items,
    required this.total,
    required this.summary,
  });

  factory PurchaseListResult.fromJson(Map<String, dynamic> json) =>
      PurchaseListResult(
        items: (json['items'] as List<dynamic>? ?? const [])
            .map((e) => PurchaseRecord.fromJson(e as Map<String, dynamic>))
            .toList(),
        total: (json['total'] as num?)?.toInt() ?? 0,
        summary: PurchaseSummary.fromJson(
            (json['summary'] as Map<String, dynamic>?) ?? const {}),
      );
}