import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:shadcn_ui/shadcn_ui.dart';
import '../../data/models/rent_dto.dart';
import '../../injection_container.dart';
import '../common/widgets/pagination.dart';
import '../common/layouts/base_list_screen.dart';
import '../common/theme_shadcn.dart';
import 'controllers/rent_controller.dart';
import 'rent_form_dialog.dart';

class RentListScreen extends StatefulWidget {
  const RentListScreen({super.key});

  @override
  State<RentListScreen> createState() => _RentListScreenState();
}

class _RentListScreenState extends State<RentListScreen> {
  late final RentController _controller;
  final _searchController = TextEditingController();

  @override
  void initState() {
    super.initState();
    _controller = getIt<RentController>();
    _loadData();
  }

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

  Future<void> _loadData() async {
    await _controller.loadRents();
  }

  Future<void> _refresh() async {
    await _controller.loadRents(refresh: true);
  }

  void _showCreateDialog() {
    showDialog(
      context: context,
      builder: (context) => RentFormDialog(
        onSubmit: (request) async {
          final success = await _controller.createRent(
            equipmentHistoryId: request.equipmentHistoryId,
            startedAt: request.startedAt,
            endedAt: request.endedAt,
          );
          if (success && mounted) {
            Navigator.of(context).pop();
            ScaffoldMessenger.of(context).showSnackBar(
              const SnackBar(content: Text('임대 계약이 생성되었습니다')),
            );
          }
          return success;
        },
      ),
    );
  }

  void _showEditDialog(RentDto rent) {
    showDialog(
      context: context,
      builder: (context) => RentFormDialog(
        rent: rent,
        onSubmit: (request) async {
          final success = await _controller.updateRent(
            id: rent.id!,
            startedAt: request.startedAt,
            endedAt: request.endedAt,
          );
          if (success && mounted) {
            Navigator.of(context).pop();
            ScaffoldMessenger.of(context).showSnackBar(
              const SnackBar(content: Text('임대 계약이 수정되었습니다')),
            );
          }
          return success;
        },
      ),
    );
  }

  Future<void> _deleteRent(RentDto rent) async {
    final confirmed = await showShadDialog<bool>(
      context: context,
      builder: (context) => ShadDialog(
        title: const Text('임대 계약 삭제'),
        description: Text('ID ${rent.id}번 임대 계약을 삭제하시겠습니까?'),
        actions: [
          ShadButton.outline(
            onPressed: () => Navigator.of(context).pop(false),
            child: const Text('취소'),
          ),
          ShadButton.destructive(
            onPressed: () => Navigator.of(context).pop(true),
            child: const Text('삭제'),
          ),
        ],
      ),
    );

    if (confirmed == true) {
      final success = await _controller.deleteRent(rent.id!);
      if (success && mounted) {
        ShadToaster.of(context).show(
          const ShadToast(
            title: Text('삭제 완료'),
            description: Text('임대 계약이 삭제되었습니다'),
          ),
        );
      }
    }
  }

  Future<void> _returnRent(RentDto rent) async {
    final confirmed = await showShadDialog<bool>(
      context: context,
      builder: (context) => ShadDialog(
        title: const Text('장비 반납'),
        description: Text('ID ${rent.id}번 임대 계약의 장비를 반납 처리하시겠습니까?'),
        actions: [
          ShadButton.outline(
            onPressed: () => Navigator.of(context).pop(false),
            child: const Text('취소'),
          ),
          ShadButton(
            onPressed: () => Navigator.of(context).pop(true),
            child: const Text('반납 처리'),
          ),
        ],
      ),
    );

    if (confirmed == true) {
      final success = await _controller.returnRent(rent.id!);
      if (success && mounted) {
        ShadToaster.of(context).show(
          const ShadToast(
            title: Text('반납 완료'),
            description: Text('장비가 반납 처리되었습니다'),
          ),
        );
      }
    }
  }


  void _onStatusFilter(String? status) {
    _controller.setStatusFilter(status);
    _controller.loadRents();
  }

  /// 헤더 셀 빌더
  Widget _buildHeaderCell(
    String text, {
    required int flex,
    required bool useExpanded,
    required double minWidth,
  }) {
    final child = Container(
      alignment: Alignment.centerLeft,
      child: Text(
        text,
        style: ShadcnTheme.bodyMedium.copyWith(fontWeight: FontWeight.w500),
      ),
    );

    if (useExpanded) {
      return Expanded(flex: flex, child: child);
    } else {
      return SizedBox(width: minWidth, child: child);
    }
  }

  /// 데이터 셀 빌더
  Widget _buildDataCell(
    Widget child, {
    required int flex,
    required bool useExpanded,
    required double minWidth,
  }) {
    final container = Container(
      alignment: Alignment.centerLeft,
      child: child,
    );

    if (useExpanded) {
      return Expanded(flex: flex, child: container);
    } else {
      return SizedBox(width: minWidth, child: container);
    }
  }

  /// 헤더 셀 리스트
  List<Widget> _buildHeaderCells() {
    return [
      _buildHeaderCell('ID', flex: 0, useExpanded: false, minWidth: 60),
      _buildHeaderCell('장비 이력 ID', flex: 1, useExpanded: true, minWidth: 100),
      _buildHeaderCell('시작일', flex: 1, useExpanded: true, minWidth: 100),
      _buildHeaderCell('종료일', flex: 1, useExpanded: true, minWidth: 100),
      _buildHeaderCell('기간 (일)', flex: 0, useExpanded: false, minWidth: 80),
      _buildHeaderCell('상태', flex: 0, useExpanded: false, minWidth: 80),
      _buildHeaderCell('작업', flex: 0, useExpanded: false, minWidth: 120),
    ];
  }

  /// 테이블 행 빌더
  Widget _buildTableRow(RentDto rent, int index) {
    final days = _controller.calculateRentDays(rent.startedAt, rent.endedAt);
    final status = _controller.getRentStatus(rent);
    
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 4),
      decoration: BoxDecoration(
        color: index.isEven 
            ? ShadcnTheme.muted.withValues(alpha: 0.1)
            : null,
        border: const Border(
          bottom: BorderSide(color: Colors.black),
        ),
      ),
      child: Row(
        children: [
          _buildDataCell(
            Text(
              rent.id?.toString() ?? '-',
              style: ShadcnTheme.bodySmall,
            ),
            flex: 0,
            useExpanded: false,
            minWidth: 60,
          ),
          _buildDataCell(
            Text(
              rent.equipmentHistoryId.toString(),
              style: ShadcnTheme.bodyMedium,
            ),
            flex: 1,
            useExpanded: true,
            minWidth: 100,
          ),
          _buildDataCell(
            Text(
              DateFormat('yyyy-MM-dd').format(rent.startedAt),
              style: ShadcnTheme.bodySmall,
            ),
            flex: 1,
            useExpanded: true,
            minWidth: 100,
          ),
          _buildDataCell(
            Text(
              DateFormat('yyyy-MM-dd').format(rent.endedAt),
              style: ShadcnTheme.bodySmall,
            ),
            flex: 1,
            useExpanded: true,
            minWidth: 100,
          ),
          _buildDataCell(
            Text(
              '$days일',
              style: ShadcnTheme.bodySmall,
              textAlign: TextAlign.center,
            ),
            flex: 0,
            useExpanded: false,
            minWidth: 80,
          ),
          _buildDataCell(
            _buildStatusChip(status),
            flex: 0,
            useExpanded: false,
            minWidth: 80,
          ),
          _buildDataCell(
            Row(
              mainAxisSize: MainAxisSize.min,
              children: [
                ShadButton.ghost(
                  size: ShadButtonSize.sm,
                  onPressed: () => _showEditDialog(rent),
                  child: const Icon(Icons.edit, size: 16),
                ),
                const SizedBox(width: 4),
                if (status == '진행중')
                  ShadButton.ghost(
                    size: ShadButtonSize.sm,
                    onPressed: () => _returnRent(rent),
                    child: const Icon(Icons.assignment_return, size: 16),
                  ),
                if (status == '진행중')
                  const SizedBox(width: 4),
                ShadButton.ghost(
                  size: ShadButtonSize.sm,
                  onPressed: () => _deleteRent(rent),
                  child: const Icon(Icons.delete, size: 16),
                ),
              ],
            ),
            flex: 0,
            useExpanded: false,
            minWidth: 120,
          ),
        ],
      ),
    );
  }

  Color _getStatusColor(String? status) {
    switch (status) {
      case '진행중':
        return Colors.blue;
      case '종료':
        return Colors.green;
      case '예약':
        return Colors.orange;
      default:
        return Colors.grey;
    }
  }

  /// 상태 배지 빌더
  Widget _buildStatusChip(String? status) {
    switch (status) {
      case '진행중':
        return ShadBadge(
          child: const Text('진행중'),
        );
      case '종료':
        return ShadBadge.secondary(
          child: const Text('종료'),
        );
      case '예약':
        return ShadBadge.outline(
          child: const Text('예약'),
        );
      default:
        return ShadBadge.destructive(
          child: const Text('알 수 없음'),
        );
    }
  }

  /// 데이터 테이블 빌더
  Widget _buildDataTable(RentController controller) {
    final rents = controller.rents;
    
    return Container(
      width: double.infinity,
      decoration: BoxDecoration(
        border: Border.all(color: Colors.black),
        borderRadius: BorderRadius.circular(ShadcnTheme.radiusMd),
      ),
      child: Column(
        children: [
          // 고정 헤더
          Container(
            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 10),
            decoration: BoxDecoration(
              color: ShadcnTheme.muted.withValues(alpha: 0.3),
              border: Border(bottom: BorderSide(color: Colors.black)),
            ),
            child: Row(children: _buildHeaderCells()),
          ),
          // 스크롤 바디
          Expanded(
            child: rents.isEmpty
                ? Center(
                    child: Column(
                      mainAxisAlignment: MainAxisAlignment.center,
                      children: [
                        Icon(
                          Icons.business_center_outlined,
                          size: 64,
                          color: ShadcnTheme.mutedForeground,
                        ),
                        const SizedBox(height: 16),
                        Text(
                          '등록된 임대 계약이 없습니다',
                          style: ShadcnTheme.bodyMedium.copyWith(
                            color: ShadcnTheme.mutedForeground,
                          ),
                        ),
                      ],
                    ),
                  )
                : ListView.builder(
                    itemCount: rents.length,
                    itemBuilder: (context, index) => _buildTableRow(rents[index], index),
                  ),
          ),
        ],
      ),
    );
  }

  /// 검색바 빌더
  Widget _buildSearchBar() {
    return Row(
      children: [
        Expanded(
          child: ShadInput(
            controller: _searchController,
            placeholder: const Text('장비 이력 ID로 검색...'),
          ),
        ),
        const SizedBox(width: 16),
        ShadButton.outline(
          onPressed: () {
            _searchController.clear();
            // 검색 초기화 로직
          },
          child: const Text('초기화'),
        ),
      ],
    );
  }

  /// 액션바 빌더
  Widget _buildActionBar() {
    return Row(
      children: [
        Expanded(
          child: Row(
            children: [
              Text(
                '임대 목록',
                style: ShadcnTheme.headingH6,
              ),
              const SizedBox(width: 16),
              ShadSelect<String?>(
                placeholder: const Text('전체'),
                options: [
                  const ShadOption(value: null, child: Text('전체')),
                  const ShadOption(value: 'active', child: Text('진행 중')),
                  const ShadOption(value: 'overdue', child: Text('연체')),
                  const ShadOption(value: 'completed', child: Text('완료')),
                  const ShadOption(value: 'cancelled', child: Text('취소')),
                ],
                selectedOptionBuilder: (context, value) {
                  switch (value) {
                    case 'active': return const Text('진행 중');
                    case 'overdue': return const Text('연체');
                    case 'completed': return const Text('완료');
                    case 'cancelled': return const Text('취소');
                    default: return const Text('전체');
                  }
                },
                onChanged: _onStatusFilter,
              ),
            ],
          ),
        ),
        Row(
          children: [
            ShadButton(
              onPressed: _showCreateDialog,
              child: const Row(
                mainAxisSize: MainAxisSize.min,
                children: [
                  Icon(Icons.add, size: 16),
                  SizedBox(width: 4),
                  Text('새 임대 계약'),
                ],
              ),
            ),
          ],
        ),
      ],
    );
  }

  /// 페이지네이션 빌더
  Widget? _buildPagination() {
    return Consumer<RentController>(
      builder: (context, controller, child) {
        if (controller.totalPages <= 1) return const SizedBox.shrink();
        
        return Pagination(
          totalCount: controller.totalRents,
          currentPage: controller.currentPage,
          pageSize: 20,
          onPageChanged: (page) => controller.loadRents(page: page),
        );
      },
    );
  }

  @override
  Widget build(BuildContext context) {
    return ChangeNotifierProvider.value(
      value: _controller,
      child: Consumer<RentController>(
        builder: (context, controller, child) {
          return BaseListScreen(
            searchBar: _buildSearchBar(),
            actionBar: _buildActionBar(),
            dataTable: _buildDataTable(controller),
            pagination: _buildPagination(),
            isLoading: controller.isLoading,
            error: controller.error,
            onRefresh: () => controller.loadRents(refresh: true),
            emptyMessage: '등록된 임대 계약이 없습니다',
            emptyIcon: Icons.business_center_outlined,
          );
        },
      ),
    );
  }
}