import 'package:flutter/material.dart';
import 'package:go_router/go_router.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:tdesign_flutter/tdesign_flutter.dart';
import '../../core/theme/app_colors.dart';
import '../shell/nav_bar_config.dart';
import '../../core/utils/date_utils.dart' as du;
import '../../shared/widgets/status_banner.dart';
import '../../shared/widgets/approval_timeline.dart';
import '../../shared/models/approval_status.dart';
import 'vehicle_model.dart';
import '../../core/i18n/app_localizations.dart';
import 'vehicle_list_controller.dart';

class VehicleDetailPage extends ConsumerStatefulWidget {
  final String id;
  const VehicleDetailPage({super.key, required this.id});
  @override
  ConsumerState<VehicleDetailPage> createState() => _VehicleDetailPageState();
}

class _VehicleDetailPageState extends ConsumerState<VehicleDetailPage> {
  // Return registration fields
  final _startOdometerCtrl = TextEditingController();
  final _endOdometerCtrl = TextEditingController();
  final _actualCostCtrl = TextEditingController();
  final _costRemarkCtrl = TextEditingController();
  DateTime? _actualReturnTime;
  bool _isSubmittingReturn = false;

  String _purposeLabel(String key) {
    switch (key) {
      case 'reception': return '客户接待';
      case 'business': return '商务出行';
      case 'official': return '公务';
      default: return key;
    }
  }

  @override
  void dispose() {
    _startOdometerCtrl.dispose();
    _endOdometerCtrl.dispose();
    _actualCostCtrl.dispose();
    _costRemarkCtrl.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final vehicle = mockVehicles.firstWhere(
      (e) => e.id == widget.id,
      orElse: () => mockVehicles.first,
    );
    final l10n = AppLocalizations.of(context);

    ref
        .read(navBarConfigProvider.notifier)
        .update(
          NavBarConfig(
            title: l10n.get('vehicleDetail'),
            showBack: true,
            onBack: () => context.pop(),
          ),
        );

    final (icon, color, statusText) = _statusProps(vehicle.status);

    return Column(
      children: [
        Expanded(
          child: SingleChildScrollView(
            padding: const EdgeInsets.fromLTRB(16, 16, 16, 32),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                StatusBanner(
                  icon: icon,
                  statusText: statusText,
                  subText: _statusSubText(vehicle),
                  color: color,
                ),
                const SizedBox(height: 8),
                Text(
                  '提交时间：${du.DateUtils.formatDateTime(vehicle.createTime)}',
                  style: const TextStyle(
                    fontSize: AppFontSizes.caption,
                    color: AppColors.textSecondary,
                  ),
                ),
                const SizedBox(height: 16),
                _buildInfoSection(vehicle),
                const SizedBox(height: 16),
                _buildMapSection(vehicle),
                const SizedBox(height: 16),
                // Return registration (only for approved)
                if (vehicle.status == 'approved')
                  _buildReturnRegistration(vehicle),
                const SizedBox(height: 16),
                _buildApprovalTimeline(vehicle),
              ],
            ),
          ),
        ),
        _buildActionBar(context, vehicle),
      ],
    );
  }

  Widget _buildInfoSection(VehicleModel vehicle) {
    return Container(
      padding: const EdgeInsets.fromLTRB(16, 8, 16, 8),
      decoration: BoxDecoration(
        color: AppColors.bgCard,
        borderRadius: BorderRadius.circular(8),
      ),
      child: Column(
        children: [
          _infoRow('申请人', vehicle.applicantName),
          _infoRow('所属部门', vehicle.deptName),
          _infoRow('车牌号', vehicle.vehicleId.isNotEmpty ? vehicle.vehicleId : '未指定'),
          _infoRow('用车目的', _purposeLabel(vehicle.purpose)),
          _infoRow('始发地', vehicle.origin.isNotEmpty ? vehicle.origin : '未填写'),
          _infoRow('目的地', vehicle.destination.isNotEmpty ? vehicle.destination : '未填写'),
          _infoRow(
            '出车时间',
            du.DateUtils.formatDateTime(vehicle.startTime),
          ),
          _infoRow(
            '还车时间',
            du.DateUtils.formatDateTime(vehicle.endTime),
          ),
          _infoRow('同行人数', '${vehicle.passengerCount}人'),
        ],
      ),
    );
  }

  Widget _infoRow(String label, String value) {
    return Container(
      height: 44,
      padding: const EdgeInsets.symmetric(vertical: 0),
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          Text(
            label,
            style: const TextStyle(
              fontSize: AppFontSizes.body,
              color: AppColors.textSecondary,
            ),
          ),
          Flexible(
            child: Text(
              value,
              style: const TextStyle(
                fontSize: AppFontSizes.body,
                color: AppColors.textPrimary,
              ),
              textAlign: TextAlign.right,
              overflow: TextOverflow.ellipsis,
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildMapSection(VehicleModel vehicle) {
    return Container(
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: AppColors.bgCard,
        borderRadius: BorderRadius.circular(8),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          const Text(
            '行程路线',
            style: TextStyle(
              fontSize: AppFontSizes.subtitle,
              fontWeight: FontWeight.w600,
              color: AppColors.textPrimary,
            ),
          ),
          const SizedBox(height: 8),
          Container(
            height: 160,
            width: double.infinity,
            decoration: BoxDecoration(
              color: const Color(0xFFE8F4FD),
              borderRadius: BorderRadius.circular(8),
            ),
            child: Stack(
              children: [
                Center(
                  child: Column(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: [
                      Row(
                        mainAxisAlignment: MainAxisAlignment.center,
                        children: [
                          const Icon(Icons.location_on, color: AppColors.success, size: 20),
                          const SizedBox(width: 4),
                          Text(
                            vehicle.origin.isNotEmpty ? vehicle.origin : '始发地',
                            style: const TextStyle(fontSize: 13, color: AppColors.textPrimary),
                          ),
                        ],
                      ),
                      const Padding(
                        padding: EdgeInsets.symmetric(vertical: 4),
                        child: Icon(Icons.arrow_downward, color: AppColors.primary, size: 18),
                      ),
                      Row(
                        mainAxisAlignment: MainAxisAlignment.center,
                        children: [
                          const Icon(Icons.location_on, color: AppColors.danger, size: 20),
                          const SizedBox(width: 4),
                          Text(
                            vehicle.destination.isNotEmpty ? vehicle.destination : '目的地',
                            style: const TextStyle(fontSize: 13, color: AppColors.textPrimary),
                          ),
                        ],
                      ),
                    ],
                  ),
                ),
                Positioned(
                  bottom: 8,
                  right: 8,
                  child: GestureDetector(
                    onTap: () {
                      TDToast.showText('导航即将开放', context: context);
                    },
                    child: Container(
                      padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 4),
                      decoration: BoxDecoration(
                        color: AppColors.primary,
                        borderRadius: BorderRadius.circular(12),
                      ),
                      child: const Row(
                        mainAxisSize: MainAxisSize.min,
                        children: [
                          Icon(Icons.navigation, size: 14, color: Colors.white),
                          SizedBox(width: 4),
                          Text(
                            '导航',
                            style: TextStyle(fontSize: 12, color: Colors.white),
                          ),
                        ],
                      ),
                    ),
                  ),
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildReturnRegistration(VehicleModel vehicle) {
    final isEndOdometerValid = _endOdometerCtrl.text.isNotEmpty &&
        (double.tryParse(_endOdometerCtrl.text) ?? 0) >=
            (double.tryParse(_startOdometerCtrl.text) ?? 0);

    return Container(
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: AppColors.bgCard,
        borderRadius: BorderRadius.circular(8),
        border: Border.all(color: AppColors.primary.withValues(alpha: 0.3)),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              const Icon(Icons.drive_eta, size: 20, color: AppColors.primary),
              const SizedBox(width: 8),
              const Text(
                '还车登记',
                style: TextStyle(
                  fontSize: AppFontSizes.subtitle,
                  fontWeight: FontWeight.w600,
                  color: AppColors.textPrimary,
                ),
              ),
            ],
          ),
          const SizedBox(height: 16),
          // 实还时间
          GestureDetector(
            onTap: () => _pickReturnDateTime(vehicle),
            child: Container(
              height: 44,
              padding: const EdgeInsets.symmetric(horizontal: 0),
              child: Row(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: [
                  const Text('实还时间', style: TextStyle(fontSize: 14, color: AppColors.textSecondary)),
                  Text(
                    _actualReturnTime != null
                        ? du.DateUtils.formatDateTime(_actualReturnTime!)
                        : '请选择',
                    style: TextStyle(
                      fontSize: 14,
                      color: _actualReturnTime != null ? AppColors.textPrimary : AppColors.textPlaceholder,
                    ),
                  ),
                ],
              ),
            ),
          ),
          if (_actualReturnTime != null)
            Padding(
              padding: const EdgeInsets.only(bottom: 8),
              child: Text(
                _actualReturnTime!.isBefore(vehicle.endTime)
                    ? '提示：提前还车'
                    : _actualReturnTime!.isAfter(vehicle.endTime)
                        ? '警告：已超出原计划还车时间'
                        : '',
                style: TextStyle(
                  fontSize: AppFontSizes.caption,
                  color: _actualReturnTime!.isAfter(vehicle.endTime)
                      ? AppColors.danger
                      : AppColors.textSecondary,
                ),
              ),
            ),
          const SizedBox(height: 8),
          // 出车前里程
          TDInput(
            controller: _startOdometerCtrl,
            hintText: '出车前里程（公里）',
            inputType: TextInputType.number,
            onChanged: (v) => setState(() {}),
          ),
          const SizedBox(height: 8),
          // 还车后里程
          TDInput(
            controller: _endOdometerCtrl,
            hintText: '还车后里程（公里）',
            inputType: TextInputType.number,
            onChanged: (v) => setState(() {}),
          ),
          if (_endOdometerCtrl.text.isNotEmpty && !isEndOdometerValid)
            const Padding(
              padding: EdgeInsets.only(top: 4),
              child: Text(
                '还车后里程不能小于出车前里程',
                style: TextStyle(
                  fontSize: AppFontSizes.caption,
                  color: AppColors.danger,
                ),
              ),
            ),
          const SizedBox(height: 8),
          // 实际费用
          TDInput(
            controller: _actualCostCtrl,
            hintText: '实际费用金额（元）',
            inputType: TextInputType.number,
            onChanged: (v) => setState(() {}),
          ),
          const SizedBox(height: 8),
          // 费用备注
          TDInput(
            controller: _costRemarkCtrl,
            hintText: '费用备注（路桥费/停车费等）',
            inputType: TextInputType.text,
            onChanged: (v) => setState(() {}),
          ),
          const SizedBox(height: 16),
          // 确认提交按钮
          SizedBox(
            width: double.infinity,
            height: 40,
            child: Material(
              color: _canSubmitReturn(isEndOdometerValid)
                  ? AppColors.primary
                  : AppColors.textPlaceholder,
              borderRadius: BorderRadius.circular(22),
              child: InkWell(
                onTap: _canSubmitReturn(isEndOdometerValid) && !_isSubmittingReturn
                    ? _submitReturn
                    : null,
                borderRadius: BorderRadius.circular(22),
                child: const Center(
                  child: Text(
                    '确认还车',
                    style: TextStyle(
                      fontSize: AppFontSizes.body,
                      fontWeight: FontWeight.w500,
                      color: Colors.white,
                    ),
                  ),
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }

  bool _canSubmitReturn(bool isEndOdometerValid) {
    return _actualReturnTime != null &&
        _startOdometerCtrl.text.isNotEmpty &&
        _endOdometerCtrl.text.isNotEmpty &&
        isEndOdometerValid;
  }

  void _submitReturn() {
    final l10n = AppLocalizations.of(context);
    showDialog(
      context: context,
      builder: (ctx) => TDAlertDialog(
        title: l10n.get('confirmSubmit'),
        contentWidget: Text(l10n.get('submitConfirmContent')),
        leftBtn: TDDialogButtonOptions(
          title: l10n.get('cancel'),
          action: () => Navigator.pop(ctx),
        ),
        rightBtn: TDDialogButtonOptions(
          title: l10n.get('confirm'),
          theme: TDButtonTheme.primary,
          action: () {
            Navigator.pop(ctx);
            setState(() => _isSubmittingReturn = true);
            TDToast.showText('还车登记已提交', context: context);
            setState(() => _isSubmittingReturn = false);
          },
        ),
      ),
    );
  }

  Widget _buildApprovalTimeline(VehicleModel vehicle) {
    final mockRecords = _generateMockRecords(vehicle);
    final mockChain = <String>['u-mgr'];

    return Container(
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: AppColors.bgCard,
        borderRadius: BorderRadius.circular(8),
      ),
      child: ApprovalTimeline(
        records: mockRecords,
        chain: mockChain,
        currentApproverId: vehicle.status == 'pending' ? 'u-mgr' : '',
      ),
    );
  }

  List<ApprovalRecord> _generateMockRecords(VehicleModel v) {
    if (v.status == 'draft' || v.status == 'withdrawn') return [];
    final records = <ApprovalRecord>[
      ApprovalRecord(
        id: 'ar-${v.id}-init',
        bizId: v.id,
        bizType: 'vehicle',
        approverId: 'u-init',
        approverName: '系统',
        approvalLevel: 0,
        action: 'approve',
        opinion: '发起申请',
        approvalTime: v.createTime,
      ),
    ];
    if (v.status == 'approved' || v.status == 'returned') {
      records.add(ApprovalRecord(
        id: 'ar-${v.id}-mgr',
        bizId: v.id,
        bizType: 'vehicle',
        approverId: 'u-mgr',
        approverName: '李四（经理）',
        approvalLevel: 1,
        action: 'approve',
        opinion: '同意',
        approvalTime: v.updateTime,
      ));
    } else if (v.status == 'rejected') {
      records.add(ApprovalRecord(
        id: 'ar-${v.id}-mgr',
        bizId: v.id,
        bizType: 'vehicle',
        approverId: 'u-mgr',
        approverName: '李四（经理）',
        approvalLevel: 1,
        action: 'reject',
        opinion: '请提供更详细的事由',
        approvalTime: v.updateTime,
      ));
    }
    return records;
  }

  void _pickReturnDateTime(VehicleModel vehicle) {
    final l10n = AppLocalizations.of(context);
    TDPicker.showDatePicker(
      context,
      title: l10n.get('selectReturnTime'),
      useYear: true,
      useMonth: true,
      useDay: true,
      useHour: true,
      useMinute: true,
      initialDate: [
        DateTime.now().year,
        DateTime.now().month,
        DateTime.now().day,
        DateTime.now().hour,
        DateTime.now().minute,
      ],
      onConfirm: (selected) {
        setState(() {
          _actualReturnTime = DateTime(
            selected['year']!,
            selected['month']!,
            selected['day']!,
            selected['hour']!,
            selected['minute']!,
          );
        });
      },
    );
  }

  Widget _buildActionBar(BuildContext context, VehicleModel vehicle) {
    Widget? actionButton;
    if (vehicle.status == 'draft') {
      actionButton = _singleButton('编辑', AppColors.primary, () {
        context.push('/vehicle/apply', extra: vehicle.id);
      });
    } else if (vehicle.status == 'pending') {
      actionButton = _singleButton('撤回申请', AppColors.primary, () {
        TDToast.showText('已撤回', context: context);
      });
    } else if (vehicle.status == 'rejected') {
      actionButton = _singleButton('重新编辑', AppColors.primary, () {
        context.push('/vehicle/apply', extra: vehicle.id);
      });
    } else if (vehicle.status == 'returned') {
      return Container(
        height: 72,
        padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 16),
        decoration: const BoxDecoration(color: AppColors.bgCard),
        child: Center(
          child: Text(
            '已还车归档于 ${vehicle.actualReturnTime != null ? du.DateUtils.formatDateTime(vehicle.actualReturnTime!) : ''}',
            style: const TextStyle(
              fontSize: AppFontSizes.caption,
              color: AppColors.textSecondary,
            ),
          ),
        ),
      );
    }

    if (actionButton == null) return const SizedBox.shrink();

    return Container(
      height: 72,
      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 16),
      decoration: const BoxDecoration(color: AppColors.bgCard),
      child: Row(children: [const Spacer(), actionButton, const Spacer()]),
    );
  }

  Widget _singleButton(String label, Color color, VoidCallback onTap) {
    return SizedBox(
      height: 40,
      child: Material(
        color: color,
        borderRadius: BorderRadius.circular(22),
        child: InkWell(
          onTap: onTap,
          borderRadius: BorderRadius.circular(22),
          child: Center(
            child: Padding(
              padding: const EdgeInsets.symmetric(horizontal: 32),
              child: Text(
                label,
                style: const TextStyle(
                  fontSize: AppFontSizes.body,
                  fontWeight: FontWeight.w500,
                  color: Colors.white,
                ),
              ),
            ),
          ),
        ),
      ),
    );
  }

  (IconData, Color, String) _statusProps(String status) {
    switch (status) {
      case 'approved':
        return (Icons.check_circle, AppColors.success, '已通过');
      case 'rejected':
        return (Icons.cancel, AppColors.danger, '已拒绝');
      case 'draft':
        return (Icons.edit_note, AppColors.statusGray, '草稿');
      case 'withdrawn':
        return (Icons.cancel_outlined, const Color(0xFF5A7D9A), '已撤回');
      case 'returned':
        return (Icons.assignment_return, AppColors.primary, '已还车');
      default:
        return (Icons.access_time, AppColors.warning, '审批中');
    }
  }

  String _statusSubText(VehicleModel vehicle) {
    switch (vehicle.status) {
      case 'pending':
        return vehicle.approvalInstanceId.isNotEmpty
            ? '审批中，请耐心等待'
            : '等待审批';
      case 'approved':
        return '已通过，请按时出车';
      case 'returned':
        return vehicle.actualReturnTime != null
            ? '还车时间：${du.DateUtils.formatDateTime(vehicle.actualReturnTime!)}'
            : '已还车归档';
      default:
        return '';
    }
  }
}