// account_screens.dart — 账户子页(套餐选择 / 设备管理 / 兑换 & 购买 / 联系我们)
// 对应 React UI Kit 的 PlansScreen / DAccountView 设备段 / RedeemScreen / ContactScreen。
// 均为带返回栏的独立页;HomeShell 账户页的行点击后 push 这些页即可。
import 'package:flutter/material.dart';
import '../pangolin_theme.dart';
import 'pangolin_icons.dart';
import 'plan_card.dart';
import 'pangolin_button.dart';

/// 通用：带返回箭头的子页骨架
class _SubScaffold extends StatelessWidget {
  const _SubScaffold({required this.title, required this.child, this.onBack});
  final String title; final Widget child; final VoidCallback? onBack;
  @override
  Widget build(BuildContext context) {
    final c = context.pangolin;
    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, fontFamily: PangolinFonts.display, fontWeight: FontWeight.w700)),
          ]),
        ),
        Expanded(child: child),
      ])),
    );
  }
}

/// ── 套餐选择 ──（点「续费 / 升级」进入）
class PlansScreen extends StatelessWidget {
  const PlansScreen({super.key, this.zh = true, this.onChoose, this.onBack});
  final bool zh; final ValueChanged<String>? onChoose; final VoidCallback? onBack;

  @override
  Widget build(BuildContext context) {
    final plans = [
      (
        id: 'free', name: zh ? '免费版' : 'Free', price: '¥0', cta: zh ? '当前' : 'Current', featured: false, current: true, pop: null,
        feats: zh ? ['3 个基础节点', '每日 1GB 流量', '1 台设备'] : ['3 basic locations', '1GB / day', '1 device'],
      ),
      (
        id: 'pro', name: zh ? '专业版' : 'Pro', price: '¥25', cta: zh ? '立即升级' : 'Upgrade', featured: true, current: false, pop: zh ? '最受欢迎' : 'Popular',
        feats: zh ? ['80+ 全球节点', '无限流量 · 极速', '5 台设备同时在线', '流媒体优化'] : ['80+ locations', 'Unlimited · fast', '5 devices', 'Streaming optimized'],
      ),
      (
        id: 'team', name: zh ? '团队版' : 'Team', price: '¥99', cta: zh ? '选择' : 'Choose', featured: false, current: false, pop: null,
        feats: zh ? ['Pro 全部功能', '10 个成员席位', '集中计费与管理', '优先客服'] : ['Everything in Pro', '10 seats', 'Central billing', 'Priority support'],
      ),
    ];
    return _SubScaffold(
      title: zh ? '选择套餐' : 'Choose plan',
      onBack: onBack,
      child: ListView(
        padding: const EdgeInsets.fromLTRB(20, 14, 20, 24),
        children: [
          for (final p in plans) Padding(
            padding: EdgeInsets.only(bottom: 14, top: p.pop != null ? 12 : 0),
            child: PlanCard(
              name: p.name, price: p.price, period: zh ? '/月' : '/mo',
              features: p.feats, ctaLabel: p.cta, featured: p.featured, isCurrent: p.current,
              popularLabel: p.pop, onPressed: () => onChoose?.call(p.id),
            ),
          ),
        ],
      ),
    );
  }
}

/// ── 设备管理 ──
class DeviceItem {
  const DeviceItem({required this.id, required this.icon, required this.name, required this.os, required this.active, this.me = false});
  final String id, name, os, active; final IconData icon; final bool me;
}

class DevicesScreen extends StatefulWidget {
  const DevicesScreen({super.key, this.zh = true, this.onBack});
  final bool zh; final VoidCallback? onBack;
  @override
  State<DevicesScreen> createState() => _DevicesScreenState();
}

class _DevicesScreenState extends State<DevicesScreen> {
  late List<DeviceItem> _devices = [
    DeviceItem(id: '1', icon: PangolinIcons.laptop, name: 'MacBook Pro', os: 'macOS 26', active: widget.zh ? '当前设备' : 'This device', me: true),
    DeviceItem(id: '2', icon: PangolinIcons.smartphone, name: 'iPhone 17', os: 'iOS 26', active: '2 min'),
    DeviceItem(id: '3', icon: PangolinIcons.monitorSmartphone, name: 'iPad Air', os: 'iPadOS 26', active: widget.zh ? '3 小时前' : '3h ago'),
  ];

  @override
  Widget build(BuildContext context) {
    final c = context.pangolin;
    return _SubScaffold(
      title: widget.zh ? '我的设备' : 'My devices',
      onBack: widget.onBack,
      child: ListView(padding: const EdgeInsets.fromLTRB(20, 4, 20, 24), children: [
        Text(widget.zh ? 'PRO 套餐最多 5 台设备同时在线' : 'Up to 5 devices on PRO', style: PangolinText.caption.copyWith(color: c.fg3, fontWeight: FontWeight.w400)),
        const SizedBox(height: 12),
        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 < _devices.length; i++) _row(c, _devices[i], i < _devices.length - 1),
          ]),
        ),
      ]),
    );
  }

  Widget _row(PangolinScheme c, DeviceItem d, bool divider) {
    return Container(
      decoration: BoxDecoration(border: divider ? Border(bottom: BorderSide(color: c.border)) : null),
      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 14),
      child: Row(children: [
        Container(width: 38, height: 38, decoration: BoxDecoration(color: c.accentSubtle, borderRadius: BorderRadius.circular(PangolinRadius.md)),
            child: Icon(d.icon, size: 19, color: c.accent)),
        const SizedBox(width: 12),
        Expanded(child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
          Row(children: [
            Flexible(child: Text(d.name, style: PangolinText.sm.copyWith(color: c.fg1, fontWeight: FontWeight.w600, fontSize: 14.5))),
            if (d.me) Container(margin: const EdgeInsets.only(left: 7), padding: const EdgeInsets.symmetric(horizontal: 7, vertical: 1),
                decoration: BoxDecoration(color: c.successSubtle, borderRadius: BorderRadius.circular(PangolinRadius.full)),
                child: Text(d.active, style: PangolinText.caption.copyWith(color: c.success, fontWeight: FontWeight.w600, fontSize: 10.5))),
          ]),
          const SizedBox(height: 1),
          Text(d.me ? d.os : '${d.os} · ${d.active}', style: PangolinText.caption.copyWith(color: c.fg3, fontWeight: FontWeight.w400)),
        ])),
        if (!d.me) OutlinedButton(
          onPressed: () => setState(() => _devices.removeWhere((x) => x.id == d.id)),
          style: OutlinedButton.styleFrom(foregroundColor: c.fg2, side: BorderSide(color: c.borderStrong, width: 1.5), shape: const StadiumBorder(), padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 7), minimumSize: Size.zero),
          child: Text(widget.zh ? '移除' : 'Remove', style: PangolinText.caption.copyWith(fontWeight: FontWeight.w600)),
        ),
      ]),
    );
  }
}

/// ── 兑换 & 购买 ──（App 内无支付,走兑换码 + 外部渠道）
class RedeemScreen extends StatefulWidget {
  const RedeemScreen({super.key, this.zh = true, this.onBack});
  final bool zh; final VoidCallback? onBack;
  @override
  State<RedeemScreen> createState() => _RedeemScreenState();
}

class _RedeemScreenState extends State<RedeemScreen> {
  final _code = TextEditingController();
  bool _ok = false;

  @override
  void dispose() { _code.dispose(); super.dispose(); }

  @override
  Widget build(BuildContext context) {
    final c = context.pangolin;
    final zh = widget.zh;
    final channels = [
      (icon: PangolinIcons.shoppingBag, name: zh ? '自助发卡商店' : 'Self-serve store', sub: 'shop.pangolin.vpn', accent: true),
      (icon: PangolinIcons.send, name: 'Telegram', sub: '@PangolinVPN_bot', accent: false),
      (icon: PangolinIcons.messageCircle, name: 'LINE', sub: '@pangolinvpn', accent: false),
      (icon: PangolinIcons.mail, name: zh ? '邮箱客服' : 'Email support', sub: 'buy@pangolin.vpn', accent: false),
    ];
    return _SubScaffold(
      title: zh ? '兑换 & 购买' : 'Redeem & buy',
      onBack: widget.onBack,
      child: ListView(padding: const EdgeInsets.fromLTRB(20, 4, 20, 24), children: [
        // redeem code
        Container(
          padding: const EdgeInsets.all(18),
          decoration: BoxDecoration(color: c.surface, borderRadius: BorderRadius.circular(PangolinRadius.xl), border: Border.all(color: c.border), boxShadow: PangolinShadow.sm),
          child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
            Text(zh ? '兑换激活码' : 'Redeem a code', style: PangolinText.sm.copyWith(color: c.fg1, fontWeight: FontWeight.w700, fontSize: 14.5)),
            const SizedBox(height: 12),
            if (_ok) Row(children: [
              Icon(PangolinIcons.checkCircle, size: 20, color: c.success), const SizedBox(width: 9),
              Text(zh ? '激活成功 · PRO 已开通' : 'Activated · PRO unlocked', style: PangolinText.body.copyWith(color: c.success, fontWeight: FontWeight.w600)),
            ]) else Row(children: [
              Expanded(child: Container(
                padding: const EdgeInsets.symmetric(horizontal: 14),
                decoration: BoxDecoration(color: c.bg, borderRadius: BorderRadius.circular(PangolinRadius.md), border: Border.all(color: c.borderStrong, width: 1.5)),
                child: TextField(controller: _code,
                    textCapitalization: TextCapitalization.characters,
                    style: PangolinText.mono.copyWith(color: c.fg1, letterSpacing: 1.5),
                    decoration: InputDecoration(border: InputBorder.none, isCollapsed: true, contentPadding: const EdgeInsets.symmetric(vertical: 13),
                        hintText: zh ? '输入激活码' : 'Enter code', hintStyle: PangolinText.sm.copyWith(color: c.fg3)),
                    onChanged: (_) => setState(() {})),
              )),
              const SizedBox(width: 10),
              PangolinButton(label: zh ? '激活' : 'Redeem', onPressed: _code.text.trim().length >= 4 ? () => setState(() => _ok = true) : null),
            ]),
          ]),
        ),
        const SizedBox(height: 22),
        Text(zh ? '购买渠道' : 'Where to buy', style: PangolinText.sm.copyWith(color: c.fg1, fontWeight: FontWeight.w700, fontSize: 14.5)),
        const SizedBox(height: 6),
        Text(zh ? 'App 内不支持直接支付。请通过以下渠道获取激活码:' : 'In-app payment is unavailable. Get a code via:',
            style: PangolinText.caption.copyWith(color: c.fg3, fontWeight: FontWeight.w400, height: 1.5)),
        const SizedBox(height: 14),
        for (final ch in channels) Padding(padding: const EdgeInsets.only(bottom: 10), child: _channel(c, ch.icon, ch.name, ch.sub, ch.accent)),
      ]),
    );
  }

  Widget _channel(PangolinScheme c, IconData icon, String name, String sub, bool accent) {
    return InkWell(
      borderRadius: BorderRadius.circular(PangolinRadius.lg),
      onTap: () {/* launchUrl(...) */},
      child: Container(
        padding: const EdgeInsets.all(14),
        decoration: BoxDecoration(
          color: accent ? c.accentSubtle : c.surface,
          borderRadius: BorderRadius.circular(PangolinRadius.lg),
          border: Border.all(color: accent ? c.accentBorder : c.border),
          boxShadow: PangolinShadow.sm,
        ),
        child: Row(children: [
          Container(width: 40, height: 40, decoration: BoxDecoration(color: accent ? c.accent : c.bgSubtle, borderRadius: BorderRadius.circular(PangolinRadius.md)),
              child: Icon(icon, size: 20, color: accent ? PangolinColors.white : c.accent)),
          const SizedBox(width: 13),
          Expanded(child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
            Text(name, style: PangolinText.body.copyWith(color: c.fg1, fontWeight: FontWeight.w600)),
            Text(sub, style: PangolinText.caption.copyWith(color: c.fg3, fontFamily: PangolinFonts.mono, fontWeight: FontWeight.w400)),
          ])),
          Icon(PangolinIcons.externalLink, size: 16, color: c.fg3),
        ]),
      ),
    );
  }
}

/// ── 联系我们 ──
class ContactScreen extends StatelessWidget {
  const ContactScreen({super.key, this.zh = true, this.onBack});
  final bool zh; final VoidCallback? onBack;

  @override
  Widget build(BuildContext context) {
    final c = context.pangolin;
    final channels = [
      (icon: PangolinIcons.send, name: 'Telegram', sub: '@PangolinVPN_bot', accent: true),
      (icon: PangolinIcons.messageCircle, name: 'LINE', sub: '@pangolinvpn', accent: false),
      (icon: PangolinIcons.mail, name: zh ? '邮箱客服' : 'Email support', sub: 'support@pangolin.vpn', accent: false),
      (icon: PangolinIcons.shoppingBag, name: zh ? '自助发卡商店' : 'Self-serve store', sub: 'shop.pangolin.vpn', accent: false),
    ];
    return _SubScaffold(
      title: zh ? '联系我们' : 'Contact us',
      onBack: onBack,
      child: ListView(padding: const EdgeInsets.fromLTRB(20, 4, 20, 24), children: [
        Text(zh ? '遇到问题?通过以下任一渠道联系我们,通常数分钟内回复。' : 'Need help? Reach us via any channel below — usually replies in minutes.',
            style: PangolinText.sm.copyWith(color: c.fg2, height: 1.6)),
        const SizedBox(height: 16),
        for (final ch in channels) Padding(padding: const EdgeInsets.only(bottom: 10), child: _contact(c, ch.icon, ch.name, ch.sub, ch.accent)),
        const SizedBox(height: 8),
        Container(
          padding: const EdgeInsets.all(16),
          decoration: BoxDecoration(color: c.surface, borderRadius: BorderRadius.circular(PangolinRadius.lg), border: Border.all(color: c.border), boxShadow: PangolinShadow.sm),
          child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
            Text(zh ? '服务时间' : 'Support hours', style: PangolinText.caption.copyWith(color: c.fg3, fontWeight: FontWeight.w600)),
            const SizedBox(height: 5),
            Text(zh ? '每日 9:00 – 24:00 (GMT+8)' : 'Daily 9:00 – 24:00 (GMT+8)', style: PangolinText.sm.copyWith(color: c.fg1, fontWeight: FontWeight.w600, fontFamily: PangolinFonts.mono)),
          ]),
        ),
      ]),
    );
  }

  Widget _contact(PangolinScheme c, IconData icon, String name, String sub, bool accent) {
    return InkWell(
      borderRadius: BorderRadius.circular(PangolinRadius.lg),
      onTap: () {/* launchUrl(...) */},
      child: Container(
        padding: const EdgeInsets.all(14),
        decoration: BoxDecoration(
          color: accent ? c.accentSubtle : c.surface,
          borderRadius: BorderRadius.circular(PangolinRadius.lg),
          border: Border.all(color: accent ? c.accentBorder : c.border),
          boxShadow: PangolinShadow.sm,
        ),
        child: Row(children: [
          Container(width: 40, height: 40, decoration: BoxDecoration(color: accent ? c.accent : c.bgSubtle, borderRadius: BorderRadius.circular(PangolinRadius.md)),
              child: Icon(icon, size: 20, color: accent ? PangolinColors.white : c.accent)),
          const SizedBox(width: 13),
          Expanded(child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
            Text(name, style: PangolinText.body.copyWith(color: c.fg1, fontWeight: FontWeight.w600)),
            Text(sub, style: PangolinText.caption.copyWith(color: c.fg3, fontFamily: PangolinFonts.mono, fontWeight: FontWeight.w400)),
          ])),
          Icon(PangolinIcons.externalLink, size: 16, color: c.fg3),
        ]),
      ),
    );
  }
}
