// payment.dart — pay v2 支付领域模型(server 代理端点的响应形状)。
// 金额只读展示:price_minor 为 CNY 分;crypto 精确金额在 session.payload 里。

/// 支付渠道:结算币种即支付方式(一步定)。usdt→加密货币 / cny→支付宝。
/// 各币种一口价(不做实时汇率换算);实际扣款以 pay 侧为准。
enum PayChannel { usdt, cny }

extension PayChannelX on PayChannel {
  String get currency => this == PayChannel.usdt ? 'USDT' : 'CNY';
  // CNY 渠道生产走哪吒(nezha)聚合(底层支付宝/微信),非直连 alipay 商户。
  String get method => this == PayChannel.usdt ? 'crypto' : 'nezha';
}

class PayCatalogItem {
  const PayCatalogItem({
    required this.sku,
    required this.plan,
    required this.days,
    required this.priceMinor,
    required this.currency,
    this.priceUsdtMicro = 0,
    this.promo = false,
  });

  final String sku;
  final String plan;
  final int days;
  final int priceMinor;      // CNY 分(展示)
  final String currency;     // CNY
  final int priceUsdtMicro;  // USDT 微元(展示;各币种一口价)
  final bool promo;          // 全员可见的限时优惠档(如 pro_month_promo)

  factory PayCatalogItem.fromJson(Map<String, dynamic> j) => PayCatalogItem(
        sku: j['sku'] as String,
        plan: j['plan'] as String? ?? 'pro',
        days: (j['days'] as num?)?.toInt() ?? 0,
        priceMinor: (j['price_minor'] as num?)?.toInt() ?? 0,
        currency: j['currency'] as String? ?? 'CNY',
        priceUsdtMicro: (j['price_usdt_micro'] as num?)?.toInt() ?? 0,
        promo: j['promo'] as bool? ?? false,
      );

  /// 约当月数(31→1 / 92→3 / 366→12),用于每月折算展示。
  int get months {
    final m = (days / 30.4).round();
    return m < 1 ? 1 : m;
  }

  /// 按渠道币种给总价文案(USDT $ / CNY ¥)。
  String priceLabel(PayChannel ch) => ch == PayChannel.usdt
      ? '\$${(priceUsdtMicro / 1000000).toStringAsFixed(2)}'
      : '¥${(priceMinor / 100).toStringAsFixed(2)}';

  /// 按渠道币种给每月折算文案(不含 /月 后缀,后缀由 l10n 提供)。
  String perMonthLabel(PayChannel ch) => ch == PayChannel.usdt
      ? '\$${(priceUsdtMicro / 1000000 / months).toStringAsFixed(2)}'
      : '¥${(priceMinor / 100 / months).toStringAsFixed(2)}';
}

/// PayOrderSummary — 订单列表项(server orderView 台账视图)。
/// 金额为结算币种 minor:CNY 分 / USDT 微元。
class PayOrderSummary {
  const PayOrderSummary({
    required this.orderNo,
    required this.sku,
    required this.plan,
    required this.days,
    required this.method,
    required this.status,
    required this.amountMinor,
    required this.currency,
    required this.createdAt,
    this.paidAt,
  });

  final String orderNo;
  final String sku;
  final String plan;
  final int days;
  final String method;      // crypto | alipay | nezha …
  final String status;      // created | paid | canceled(本地台账)
  final int amountMinor;
  final String currency;    // CNY | USDT
  final DateTime? createdAt;
  final DateTime? paidAt;

  factory PayOrderSummary.fromJson(Map<String, dynamic> j) => PayOrderSummary(
        orderNo: j['order_no'] as String? ?? '',
        sku: j['sku'] as String? ?? '',
        plan: j['plan'] as String? ?? 'pro',
        days: (j['days'] as num?)?.toInt() ?? 0,
        method: j['method'] as String? ?? '',
        status: j['status'] as String? ?? '',
        amountMinor: (j['amount_minor'] as num?)?.toInt() ?? 0,
        currency: j['currency'] as String? ?? 'CNY',
        createdAt: j['created_at'] == null ? null : DateTime.tryParse(j['created_at'] as String),
        paidAt: j['paid_at'] == null ? null : DateTime.tryParse(j['paid_at'] as String),
      );

  /// 结算币种金额文案(USDT 6 位、CNY 2 位)。
  String amountLabel() => currency == 'USDT'
      ? '\$${(amountMinor / 1000000).toStringAsFixed(2)}'
      : '¥${(amountMinor / 100).toStringAsFixed(2)}';
}

class PaySession {
  const PaySession({required this.renderType, required this.payload, this.expiresAt});

  final String renderType; // crypto_address | redirect | qr
  final Map<String, dynamic> payload;
  final DateTime? expiresAt;

  factory PaySession.fromJson(Map<String, dynamic> j) => PaySession(
        renderType: j['render_type'] as String? ?? '',
        payload: (j['payload'] as Map<String, dynamic>?) ?? const {},
        expiresAt: j['expires_at'] == null ? null : DateTime.tryParse(j['expires_at'] as String),
      );
}

class PayOrder {
  const PayOrder({required this.orderNo, required this.session});

  final String orderNo;
  final PaySession session;

  factory PayOrder.fromJson(Map<String, dynamic> j) => PayOrder(
        orderNo: j['order_no'] as String,
        session: PaySession.fromJson((j['session'] as Map<String, dynamic>?) ?? const {}),
      );
}

/// PayOrderStatus — 查单/详情响应。轮询只用 activated;订单详情页额外用
/// 台账富字段(server GetOrder 现回带 orderView 全字段)。
class PayOrderStatus {
  const PayOrderStatus({
    required this.orderNo,
    required this.payStatus,
    required this.activated,
    this.expiresAt,
    this.summary,
  });

  final String orderNo;
  final String payStatus;
  final bool activated; // server 台账已消费 = 权益已开通(轮询成功判据)
  final DateTime? expiresAt;
  final PayOrderSummary? summary; // 台账富字段(sku/plan/method/金额/时间…);详情页用

  factory PayOrderStatus.fromJson(Map<String, dynamic> j) => PayOrderStatus(
        orderNo: j['order_no'] as String? ?? '',
        payStatus: j['pay_status'] as String? ?? '',
        activated: j['activated'] as bool? ?? false,
        expiresAt: j['expires_at'] == null ? null : DateTime.tryParse(j['expires_at'] as String),
        // 详情端点回带台账字段(列表端点同形);sku 存在才解析。
        summary: j['sku'] == null ? null : PayOrderSummary.fromJson(j),
      );
}