// orders_page.dart — 我的订单(列表 → 详情两屏,单 widget 内切换)。
//
// 数据走本地台账(ordersProvider / orderDetailProvider);金额/状态文案全经 AppText。
// App 内无支付表单——「继续支付 / 重新购买」只引导到购买页(PurchaseScreen)。
// 规格参考 design/prototype/screens/orders.html。
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';

import '../core/responsive/form_factor.dart';
import '../l10n/app_text.dart';
import '../models/payment.dart';
import '../pangolin_theme.dart';
import '../state/navigation_provider.dart';
import '../state/orders_provider.dart';
import '../widgets/pangolin_button.dart';
import '../widgets/pangolin_icons.dart';
import '../widgets/status_pill.dart';
import 'payment_page.dart';
import 'purchase_page.dart';

// ── 文案映射工具(sku→套餐名 / method→支付方式 / status→状态胶囊)──

String _planName(AppText t, PayOrderSummary o) => switch (o.sku) {
      'pro_month' => t.proMonthly,
      'pro_quarter' => t.proQuarterly,
      'pro_year' => t.proYearly,
      _ => o.sku.isNotEmpty ? o.sku : o.plan,
    };

String _methodName(AppText t, String method) => switch (method) {
      'crypto' => t.payMethodCrypto,
      'alipay' => t.payMethodAlipay,
      'nezha' => t.payMethodNezha,
      _ => method,
    };

/// 订单状态 → (胶囊色, 文案)。created=等待付款 / paid=已开通 / canceled=已取消 / expired=已过期。
({PangolinStatus status, String label}) _statusPill(AppText t, String status) =>
    switch (status) {
      'created' => (status: PangolinStatus.connecting, label: t.awaitingPayment),
      'paid' => (status: PangolinStatus.connected, label: t.orderStatusPaid),
      'canceled' => (status: PangolinStatus.neutral, label: t.orderStatusCanceled),
      'expired' => (status: PangolinStatus.neutral, label: t.orderStatusExpired),
      _ => (status: PangolinStatus.neutral, label: status),
    };

String _fmtDate(DateTime d) {
  final l = d.toLocal();
  String two(int v) => v.toString().padLeft(2, '0');
  return '${l.year}-${two(l.month)}-${two(l.day)}';
}

String _fmtDateTime(DateTime d) {
  final l = d.toLocal();
  String two(int v) => v.toString().padLeft(2, '0');
  return '${l.year}-${two(l.month)}-${two(l.day)} ${two(l.hour)}:${two(l.minute)}';
}

/// 带返回栏的子页骨架(embedded=true 只返回内容,返回/标题由外层 shell 顶栏提供)。
class _SubScaffold extends StatelessWidget {
  const _SubScaffold({required this.title, required this.child, this.onBack, this.embedded = false});
  final String title;
  final Widget child;
  final VoidCallback? onBack;
  final bool embedded;
  @override
  Widget build(BuildContext context) {
    final c = context.pangolin;
    if (embedded) return child;
    return Scaffold(
      backgroundColor: c.bg,
      body: SafeArea(
        child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
          Padding(
            padding: const EdgeInsets.fromLTRB(8, 6, 16, 10),
            child: Row(children: [
              IconButton(
                onPressed: onBack ?? () => Navigator.of(context).maybePop(),
                icon: Icon(PangolinIcons.arrowLeft, size: 22, color: c.fg1),
              ),
              Text(title, style: PangolinText.h3.copyWith(color: c.fg1, fontWeight: FontWeight.w700)),
            ]),
          ),
          Expanded(child: child),
        ]),
      ),
    );
  }
}

/// 订单页入口:内部在「列表」与「详情」两屏间切换(与原型单帧同构)。
class OrdersScreen extends ConsumerStatefulWidget {
  const OrdersScreen({super.key, required this.t, this.onBack, this.embedded = false});
  final AppText t;
  final VoidCallback? onBack;
  final bool embedded;

  @override
  ConsumerState<OrdersScreen> createState() => _OrdersScreenState();
}

class _OrdersScreenState extends ConsumerState<OrdersScreen> {
  PayOrderSummary? _selected; // 非空 = 展示详情

  @override
  Widget build(BuildContext context) {
    if (_selected != null) {
      return _OrderDetailView(
        t: widget.t,
        order: _selected!,
        embedded: widget.embedded,
        onBack: () => setState(() => _selected = null),
      );
    }
    return _OrderListView(
      t: widget.t,
      embedded: widget.embedded,
      onBack: widget.onBack,
      onOpen: (o) => setState(() => _selected = o),
    );
  }
}

// ── 列表屏 ──
class _OrderListView extends ConsumerWidget {
  const _OrderListView({required this.t, required this.embedded, required this.onOpen, this.onBack});
  final AppText t;
  final bool embedded;
  final ValueChanged<PayOrderSummary> onOpen;
  final VoidCallback? onBack;

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final c = context.pangolin;
    final ordersAsync = ref.watch(ordersProvider);

    Widget refreshBtn() => Align(
          alignment: Alignment.centerRight,
          child: InkWell(
            borderRadius: BorderRadius.circular(PangolinRadius.full),
            onTap: () => ref.invalidate(ordersProvider),
            child: Container(
              padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 7),
              decoration: BoxDecoration(
                color: c.bgSubtle,
                borderRadius: BorderRadius.circular(PangolinRadius.full),
                border: Border.all(color: c.border),
              ),
              child: Row(mainAxisSize: MainAxisSize.min, children: [
                Icon(PangolinIcons.refreshCw, size: 14, color: c.fg2),
                const SizedBox(width: 6),
                Text(t.orderRefresh, style: PangolinText.caption.copyWith(color: c.fg2, fontWeight: FontWeight.w600, fontSize: 12.5)),
              ]),
            ),
          ),
        );

    Widget empty() => Padding(
          padding: const EdgeInsets.only(top: 60),
          child: Column(children: [
            Container(
              width: 56, height: 56,
              decoration: BoxDecoration(color: c.bgSubtle, shape: BoxShape.circle),
              child: Icon(PangolinIcons.ticket, size: 26, color: c.fg3),
            ),
            const SizedBox(height: 14),
            Text(t.ordersEmpty, style: PangolinText.sm.copyWith(color: c.fg3)),
          ]),
        );

    Widget content() => ordersAsync.when(
          loading: () => const Center(child: Padding(padding: EdgeInsets.all(40), child: CircularProgressIndicator())),
          error: (_, __) => Center(
              child: Padding(padding: const EdgeInsets.all(40), child: Text(t.lang.loadFailedRetry, style: PangolinText.body.copyWith(color: c.fg3)))),
          data: (orders) => ListView(padding: const EdgeInsets.fromLTRB(20, 8, 20, 24), children: [
            refreshBtn(),
            const SizedBox(height: 12),
            if (orders.isEmpty)
              empty()
            else
              Container(
                decoration: BoxDecoration(
                  color: c.surface,
                  borderRadius: BorderRadius.circular(PangolinRadius.lg),
                  border: Border.all(color: c.border),
                  boxShadow: PangolinShadow.sm,
                ),
                clipBehavior: Clip.antiAlias,
                child: Column(children: [
                  for (var i = 0; i < orders.length; i++)
                    _row(context, c, orders[i], i < orders.length - 1),
                ]),
              ),
          ]),
        );

    return _SubScaffold(title: t.ordersTitle, onBack: onBack, embedded: embedded, child: content());
  }

  Widget _row(BuildContext context, PangolinScheme c, PayOrderSummary o, bool divider) {
    final pill = _statusPill(t, o.status);
    final dateStr = o.createdAt != null ? _fmtDate(o.createdAt!) : '';
    final sub = [o.amountLabel(), if (dateStr.isNotEmpty) dateStr].join(' · ');
    return InkWell(
      onTap: () => onOpen(o),
      child: Container(
        decoration: BoxDecoration(border: divider ? Border(bottom: BorderSide(color: c.border)) : null),
        padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 13),
        child: Row(children: [
          Container(
            width: 38, height: 38,
            decoration: BoxDecoration(color: c.accentSubtle, borderRadius: BorderRadius.circular(PangolinRadius.md)),
            child: Icon(PangolinIcons.ticket, size: 19, color: c.accent),
          ),
          const SizedBox(width: 12),
          Expanded(
            child: Column(crossAxisAlignment: CrossAxisAlignment.start, mainAxisSize: MainAxisSize.min, children: [
              Text(_planName(t, o), overflow: TextOverflow.ellipsis,
                  style: PangolinText.sm.copyWith(color: c.fg1, fontWeight: FontWeight.w600, fontSize: 14.5)),
              const SizedBox(height: 2),
              Text(sub, overflow: TextOverflow.ellipsis,
                  style: PangolinText.caption.copyWith(color: c.fg3, fontWeight: FontWeight.w400)),
            ]),
          ),
          const SizedBox(width: 8),
          StatusPill(label: pill.label, status: pill.status),
          const SizedBox(width: 4),
          Icon(PangolinIcons.chevronRight, size: 18, color: c.fg3),
        ]),
      ),
    );
  }
}

// ── 详情屏 ──
class _OrderDetailView extends ConsumerWidget {
  const _OrderDetailView({required this.t, required this.order, required this.embedded, required this.onBack});
  final AppText t;
  final PayOrderSummary order;
  final bool embedded;
  final VoidCallback onBack;

  // 「继续支付 / 重新购买」→ 购买页(desktop 内容区下钻;mobile/tablet 全屏 push)。
  void _goPurchase(BuildContext context, WidgetRef ref) {
    final isDesktop = context.formFactor == FormFactor.desktop;
    if (isDesktop) {
      ref.read(navViewProvider.notifier).state = NavView.purchase;
    } else {
      Navigator.of(context).push(MaterialPageRoute(
        builder: (_) => PurchaseScreen(
          t: t,
          onOrderCreated: () => Navigator.of(context).push(
            MaterialPageRoute(builder: (_) => PaymentScreen(t: t)),
          ),
        ),
      ));
    }
  }

  Future<void> _copy(BuildContext context, String text) async {
    await Clipboard.setData(ClipboardData(text: text));
    if (context.mounted) {
      ScaffoldMessenger.of(context).showSnackBar(SnackBar(
        content: Text(t.copied),
        behavior: SnackBarBehavior.floating,
        duration: const Duration(milliseconds: 1400),
      ));
    }
  }

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final c = context.pangolin;
    // 富详情(拿新鲜 expiresAt/status);summary 缺省回退列表项。
    final detailAsync = ref.watch(orderDetailProvider(order.orderNo));
    final o = detailAsync.valueOrNull?.summary ?? order;
    final expiresAt = detailAsync.valueOrNull?.expiresAt;
    final pill = _statusPill(t, o.status);

    // 内容区(mobile 套 _SubScaffold;desktop embedded 前置一条返回条回到列表)。
    Widget summaryCard() => Container(
          width: double.infinity,
          decoration: BoxDecoration(
            color: c.surface,
            borderRadius: BorderRadius.circular(PangolinRadius.xl),
            border: Border.all(color: c.border),
            boxShadow: PangolinShadow.sm,
          ),
          padding: const EdgeInsets.all(20),
          child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
            Text(_planName(t, o), style: PangolinText.sm.copyWith(color: c.fg2, fontWeight: FontWeight.w600)),
            const SizedBox(height: 10),
            Text(o.amountLabel(), style: PangolinText.h1.copyWith(color: c.fg1, fontWeight: FontWeight.w700, height: 1)),
            const SizedBox(height: 14),
            StatusPill(label: pill.label, status: pill.status),
          ]),
        );

    Widget kvCard() {
      final rows = <Widget>[
        _kv(c, t.orderNoLabel, o.orderNo, onCopy: () => _copy(context, o.orderNo)),
        _kv(c, t.orderPlanLabel, _planName(t, o)),
        _kv(c, t.orderMethodLabel, _methodName(t, o.method)),
        _kv(c, t.orderAmountLabel, o.amountLabel()),
        if (o.createdAt != null) _kv(c, t.orderCreatedLabel, _fmtDateTime(o.createdAt!)),
        if (o.paidAt != null) _kv(c, t.orderPaidLabel, _fmtDateTime(o.paidAt!)),
        if (expiresAt != null) _kv(c, t.payExpiresAt, _fmtDate(expiresAt)),
      ];
      return Container(
        decoration: BoxDecoration(
          color: c.surface,
          borderRadius: BorderRadius.circular(PangolinRadius.lg),
          border: Border.all(color: c.border),
          boxShadow: PangolinShadow.sm,
        ),
        clipBehavior: Clip.antiAlias,
        child: Column(children: [
          for (var i = 0; i < rows.length; i++) ...[
            rows[i],
            if (i < rows.length - 1) Divider(height: 1, color: c.border),
          ],
        ]),
      );
    }

    Widget actions() {
      final list = <Widget>[];
      switch (o.status) {
        case 'created':
          list.add(PangolinButton(label: t.orderContinuePay, expand: true, onPressed: () => _goPurchase(context, ref)));
        // 过期单 pay 会话已失效,点击是重新下单而非续付 → 用「重新购买」避免歧义。
        case 'expired':
        case 'canceled':
          list.add(PangolinButton(label: t.orderRebuy, expand: true, onPressed: () => _goPurchase(context, ref)));
        case 'paid':
          list.add(PangolinButton(label: t.orderRebuy, variant: PangolinButtonVariant.secondary, expand: true, onPressed: () => _goPurchase(context, ref)));
      }
      if (list.isEmpty) return const SizedBox.shrink();
      return Column(children: [for (final w in list) Padding(padding: const EdgeInsets.only(bottom: 10), child: w)]);
    }

    Widget body() => ListView(padding: const EdgeInsets.fromLTRB(20, 12, 20, 24), children: [
          summaryCard(),
          const SizedBox(height: 18),
          kvCard(),
          const SizedBox(height: 20),
          actions(),
        ]);

    if (embedded) {
      // desktop 内容区:shell 顶栏返回 = 回账户;这里再给一条返回条回到订单列表。
      return Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
        InkWell(
          onTap: onBack,
          child: Padding(
            padding: const EdgeInsets.fromLTRB(16, 10, 16, 6),
            child: Row(mainAxisSize: MainAxisSize.min, children: [
              Icon(PangolinIcons.arrowLeft, size: 18, color: c.accent),
              const SizedBox(width: 6),
              Text(t.orderDetailTitle, style: PangolinText.sm.copyWith(color: c.accent, fontWeight: FontWeight.w600)),
            ]),
          ),
        ),
        Expanded(child: body()),
      ]);
    }
    return _SubScaffold(title: t.orderDetailTitle, onBack: onBack, child: body());
  }

  Widget _kv(PangolinScheme c, String label, String value, {VoidCallback? onCopy}) {
    return Padding(
      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 13),
      child: Row(crossAxisAlignment: CrossAxisAlignment.start, children: [
        SizedBox(
          width: 92,
          child: Text(label, style: PangolinText.caption.copyWith(color: c.fg3, fontWeight: FontWeight.w500)),
        ),
        const SizedBox(width: 12),
        Expanded(
          child: Text(value, textAlign: TextAlign.right,
              style: PangolinText.sm.copyWith(color: c.fg1, fontWeight: FontWeight.w500)),
        ),
        if (onCopy != null) ...[
          const SizedBox(width: 8),
          InkWell(
            borderRadius: BorderRadius.circular(PangolinRadius.sm),
            onTap: onCopy,
            child: Padding(padding: const EdgeInsets.all(2), child: Icon(PangolinIcons.copy, size: 15, color: c.fg3)),
          ),
        ],
      ]),
    );
  }
}