import 'dart:async';
import 'package:autosos_flutter/model/order.dart';
import 'package:autosos_flutter/provider/providers.dart';
import 'package:autosos_flutter/router/app_router.dart';
import 'package:autosos_flutter/util/toast.dart';
import 'package:autosos_flutter/widget/multi_state_view.dart';
import 'package:autosos_flutter/widget/watermark.dart';
import 'package:flutter/material.dart';
import 'package:flutter_easyloading/flutter_easyloading.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';
import 'package:url_launcher/url_launcher.dart';

/// 救援中页（对应 Android ConductActivity）
/// 步骤：开始 → 到达现场 → 拍照 → 签字 → 收款 → 完成
class ConductPage extends ConsumerStatefulWidget {
  final int orderId;
  const ConductPage({super.key, required this.orderId});

  @override
  ConsumerState<ConductPage> createState() => _ConductPageState();
}

class _ConductPageState extends ConsumerState<ConductPage> {
  MultiState _state = MultiState.loading;
  Order? _order;
  Timer? _ticker;
  Duration _elapsed = Duration.zero;

  @override
  void initState() {
    super.initState();
    _load();
    _ticker = Timer.periodic(const Duration(seconds: 1), (_) {
      if (!mounted || _order == null) return;
      setState(() {
        final start = _order!.acceptedAt ?? _order!.createdAt;
        _elapsed = DateTime.now().difference(start);
      });
    });
  }

  @override
  void dispose() {
    _ticker?.cancel();
    super.dispose();
  }

  Future<void> _load() async {
    setState(() => _state = MultiState.loading);
    try {
      final resp = await ref.read(orderApiProvider).orderDetail(widget.orderId);
      if (!mounted) return;
      if (!resp.isSuccess || resp.data == null) {
        setState(() => _state = MultiState.error);
        Toast.error(resp.message ?? '订单不存在');
        return;
      }
      final o = resp.data!;
      setState(() {
        _order = o;
        _state = MultiState.success;
      });
      ref.read(orderServiceProvider).setCurrent(o);
    } catch (e) {
      if (mounted) setState(() => _state = MultiState.error);
    }
  }

  Future<void> _arrive() async {
    EasyLoading.show(status: '上报中…');
    try {
      await ref.read(orderServiceProvider).arrive();
      EasyLoading.dismiss();
      Toast.success('已标记到达现场');
      _load();
    } catch (e) {
      EasyLoading.dismiss();
      Toast.error('上报失败：$e');
    }
  }

  Future<void> _cancel() async {
    final ok = await showDialog<bool>(
      context: context,
      builder: (ctx) => AlertDialog(
        title: const Text('取消订单'),
        content: const Text('确定要取消此订单吗？取消后无法恢复。'),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(ctx, false),
            child: const Text('不取消'),
          ),
          ElevatedButton(
            style: ElevatedButton.styleFrom(backgroundColor: Colors.red),
            onPressed: () => Navigator.pop(ctx, true),
            child: const Text('确认取消'),
          ),
        ],
      ),
    );
    if (ok != true) return;
    try {
      await ref.read(orderServiceProvider).cancel();
      Toast.success('已取消');
      if (mounted) context.go(Routes.home);
    } catch (e) {
      Toast.error('取消失败：$e');
    }
  }

  Future<void> _call(String? phone) async {
    if (phone == null || phone.isEmpty) {
      Toast.error('客户未留电话');
      return;
    }
    final uri = Uri.parse('tel:$phone');
    if (await canLaunchUrl(uri)) {
      await launchUrl(uri);
    } else {
      Toast.error('无法拨打电话');
    }
  }

  Future<void> _navigate() async {
    final o = _order;
    if (o?.lat == null || o?.lng == null) {
      Toast.error('暂无位置信息');
      return;
    }
    // 高德地图 URL Scheme
    final uri = Uri.parse(
      'androidamap://navi?sourceApplication=jjsos&lat=${o!.lat}&lon=${o.lng}&dev=0&style=2',
    );
    if (await canLaunchUrl(uri)) {
      await launchUrl(uri);
    } else {
      // 退回到 web 版
      final web = Uri.parse(
        'https://uri.amap.com/navigation?to=${o.lng},${o.lat},${o.address ?? "救援地点"}&mode=car',
      );
      await launchUrl(web, mode: LaunchMode.externalApplication);
    }
  }

  String _fmt(Duration d) {
    String two(int n) => n.toString().padLeft(2, '0');
    return '${two(d.inHours)}:${two(d.inMinutes.remainder(60))}:${two(d.inSeconds.remainder(60))}';
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('救援中'),
        actions: [
          IconButton(icon: const Icon(Icons.refresh), onPressed: _load),
        ],
      ),
      body: MultiStateView(
        state: _state,
        onRetry: _load,
        child: _order == null
            ? const SizedBox.shrink()
            : _body(_order!),
      ),
    );
  }

  Widget _body(Order o) {
    final isArrived = o.status == OrderStatus.conducting ||
        o.status == OrderStatus.photographing ||
        o.status == OrderStatus.signing ||
        o.status == OrderStatus.collecting;
    return Stack(
      children: [
        ListView(
          padding: const EdgeInsets.all(12),
          children: [
            // 倒计时卡片
            Container(
              padding: const EdgeInsets.all(16),
              decoration: BoxDecoration(
                gradient: LinearGradient(
                  colors: [Colors.red.shade400, Colors.red.shade700],
                ),
                borderRadius: BorderRadius.circular(8),
              ),
              child: Row(
                children: [
                  const Icon(Icons.timer, color: Colors.white),
                  const SizedBox(width: 8),
                  Text(
                    '已耗时 ${_fmt(_elapsed)}',
                    style: const TextStyle(
                      color: Colors.white,
                      fontSize: 18,
                      fontWeight: FontWeight.bold,
                    ),
                  ),
                  const Spacer(),
                  Text('订单号：${o.orderNo}',
                      style:
                          const TextStyle(color: Colors.white, fontSize: 12)),
                ],
              ),
            ),
            const SizedBox(height: 12),
            // 客户信息
            _section(
              title: '客户信息',
              children: [
                _kv('联系人', o.customerName ?? '—'),
                _kv('电话', o.customerPhone ?? '—'),
                if (o.carNo != null) _kv('车牌', o.carNo!),
                if (o.carType != null) _kv('车型', o.carType!),
                if (o.description != null) _kv('描述', o.description!),
              ],
            ),
            const SizedBox(height: 12),
            // 救援地点
            _section(
              title: '救援地点',
              children: [
                Padding(
                  padding: const EdgeInsets.symmetric(
                    horizontal: 12,
                    vertical: 8,
                  ),
                  child: Row(
                    children: [
                      const Icon(Icons.location_on,
                          color: Colors.red, size: 18),
                      const SizedBox(width: 4),
                      Expanded(
                        child: Text(
                          o.address ?? '—',
                          style: const TextStyle(fontSize: 14),
                        ),
                      ),
                      TextButton.icon(
                        onPressed: _navigate,
                        icon: const Icon(Icons.directions, size: 16),
                        label: const Text('导航'),
                      ),
                      TextButton.icon(
                        onPressed: () => _call(o.customerPhone),
                        icon: const Icon(Icons.phone, size: 16),
                        label: const Text('呼叫'),
                      ),
                    ],
                  ),
                ),
              ],
            ),
            const SizedBox(height: 12),
            // 步骤流程
            _section(
              title: '服务流程',
              children: [
                _Step(
                  active: true,
                  done: isArrived,
                  title: '到达现场',
                  child: isArrived
                      ? Text('已到达：${o.arrivedAt ?? "—"}',
                          style: const TextStyle(color: Colors.grey))
                      : ElevatedButton(
                          onPressed: _arrive,
                          style: ElevatedButton.styleFrom(
                            backgroundColor: Theme.of(context).primaryColor,
                          ),
                          child: const Text('我已到达现场'),
                        ),
                ),
                _Step(
                  active: isArrived,
                  done: o.photoUrls.isNotEmpty,
                  title: '拍照取证',
                  child: ElevatedButton(
                    onPressed: isArrived
                        ? () => context
                            .push('${Routes.orderPhotograph}/${o.id}')
                            .then((_) => _load())
                        : null,
                    child: Text(
                      o.photoUrls.isEmpty
                          ? '开始拍照'
                          : '已拍 ${o.photoUrls.length} 张，继续',
                    ),
                  ),
                ),
                _Step(
                  active: o.photoUrls.isNotEmpty,
                  done: o.signatureUrl != null,
                  title: '客户签字',
                  child: ElevatedButton(
                    onPressed: o.photoUrls.isNotEmpty
                        ? () => context
                            .push('${Routes.orderAutograph}/${o.id}')
                            .then((_) => _load())
                        : null,
                    child: const Text('让客户签字'),
                  ),
                ),
                _Step(
                  active: o.signatureUrl != null,
                  done: o.payMethod != null,
                  title: '客户付款',
                  child: ElevatedButton(
                    onPressed: o.signatureUrl != null
                        ? () => context
                            .push('${Routes.orderCollection}/${o.id}')
                            .then((_) => _load())
                        : null,
                    child: const Text('发起收款'),
                  ),
                ),
                _Step(
                  active: o.payMethod != null,
                  done: o.status == OrderStatus.completed,
                  title: '完成订单',
                  child: ElevatedButton(
                    onPressed: o.payMethod != null
                        ? () => context
                            .push('${Routes.orderComplete}/${o.id}')
                            .then((_) => _load())
                        : null,
                    style: ElevatedButton.styleFrom(
                      backgroundColor: Colors.green,
                    ),
                    child: const Text('提交完成'),
                  ),
                ),
              ],
            ),
            const SizedBox(height: 12),
            // 取消订单
            OutlinedButton.icon(
              onPressed: _cancel,
              icon: const Icon(Icons.cancel_outlined, color: Colors.red),
              label: const Text(
                '取消订单',
                style: TextStyle(color: Colors.red),
              ),
              style: OutlinedButton.styleFrom(
                side: const BorderSide(color: Colors.red),
                minimumSize: const Size.fromHeight(48),
              ),
            ),
            const SizedBox(height: 80),
          ],
        ),
        // 全屏水印
        const IgnorePointer(
          child: Watermark(
            text: '啾啾救援 © 内部资料',
          ),
        ),
      ],
    );
  }

  Widget _section({required String title, required List<Widget> children}) {
    return Material(
      color: Colors.white,
      borderRadius: BorderRadius.circular(8),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Container(
            padding: const EdgeInsets.fromLTRB(12, 12, 12, 8),
            child: Text(
              title,
              style: const TextStyle(fontSize: 14, fontWeight: FontWeight.w600),
            ),
          ),
          ...children,
          const SizedBox(height: 8),
        ],
      ),
    );
  }

  Widget _kv(String k, String v) => Padding(
        padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 4),
        child: Row(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            SizedBox(
              width: 60,
              child: Text(k,
                  style: TextStyle(color: Colors.grey.shade600, fontSize: 13)),
            ),
            Expanded(
              child: Text(v, style: const TextStyle(fontSize: 14)),
            ),
          ],
        ),
      );
}

class _Step extends StatelessWidget {
  final bool active;
  final bool done;
  final String title;
  final Widget child;
  const _Step({
    required this.active,
    required this.done,
    required this.title,
    required this.child,
  });

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.fromLTRB(12, 8, 12, 8),
      child: Row(
        children: [
          Container(
            width: 24,
            height: 24,
            decoration: BoxDecoration(
              shape: BoxShape.circle,
              color: done
                  ? Colors.green
                  : (active
                      ? Theme.of(context).primaryColor
                      : Colors.grey.shade300),
            ),
            child: Icon(
              done ? Icons.check : Icons.circle,
              size: 14,
              color: Colors.white,
            ),
          ),
          const SizedBox(width: 8),
          SizedBox(
            width: 70,
            child: Text(
              title,
              style: TextStyle(
                fontSize: 14,
                color: active ? Colors.black : Colors.grey,
              ),
            ),
          ),
          Expanded(child: child),
        ],
      ),
    );
  }
}