import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

import '../../data/models/rent_dto.dart';

class RentFormDialog extends StatefulWidget {
  final RentDto? rent;
  final Future<bool> Function(RentRequestDto) onSubmit;

  const RentFormDialog({
    super.key,
    this.rent,
    required this.onSubmit,
  });

  @override
  State<RentFormDialog> createState() => _RentFormDialogState();
}

class _RentFormDialogState extends State<RentFormDialog> {
  final _formKey = GlobalKey<FormState>();
  
  // 백엔드 스키마에 맞는 필드만 유지
  int? _selectedEquipmentHistoryId;
  DateTime _startDate = DateTime.now();
  DateTime? _endDate;
  
  bool _isLoading = false;

  @override
  void initState() {
    super.initState();
    if (widget.rent != null) {
      _initializeForm(widget.rent!);
    }
  }

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

  void _initializeForm(RentDto rent) {
    _selectedEquipmentHistoryId = rent.equipmentHistoryId;
    _startDate = rent.startedAt;
    _endDate = rent.endedAt;
  }

  Future<void> _selectStartDate() async {
    final date = await showDatePicker(
      context: context,
      initialDate: _startDate,
      firstDate: DateTime(2020),
      lastDate: DateTime(2030),
    );

    if (date != null) {
      setState(() {
        _startDate = date;
      });
    }
  }
  
  Future<void> _selectEndDate() async {
    final date = await showDatePicker(
      context: context,
      initialDate: _endDate ?? DateTime.now().add(const Duration(days: 30)),
      firstDate: _startDate,
      lastDate: DateTime(2030),
    );

    if (date != null) {
      setState(() {
        _endDate = date;
      });
    }
  }

  Future<void> _submit() async {
    if (_selectedEquipmentHistoryId == null || _endDate == null) {
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('장비 이력과 종료일을 선택해주세요')),
      );
      return;
    }

    setState(() => _isLoading = true);

    try {
      final request = RentRequestDto(
        equipmentHistoryId: _selectedEquipmentHistoryId!,
        startedAt: _startDate,
        endedAt: _endDate!,
      );

      await widget.onSubmit(request);
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('오류가 발생했습니다: $e')),
        );
      }
    } finally {
      if (mounted) {
        setState(() => _isLoading = false);
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return Dialog(
      child: Container(
        width: 500,
        constraints: const BoxConstraints(maxHeight: 600),
        padding: const EdgeInsets.all(24),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            // 제목
            Text(
              widget.rent != null ? '임대 계약 수정' : '새 임대 계약',
              style: Theme.of(context).textTheme.headlineSmall,
            ),
            const SizedBox(height: 24),

            // 폼 (백엔드 스키마 3개 필드만 포함)
            Expanded(
              child: Form(
                key: _formKey,
                child: SingleChildScrollView(
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      // 장비 이력 ID (백엔드 필수 필드)
                      TextFormField(
                        decoration: const InputDecoration(
                          labelText: '장비 이력 ID *',
                          border: OutlineInputBorder(),
                          helperText: '임대할 장비의 이력 ID를 입력하세요',
                        ),
                        keyboardType: TextInputType.number,
                        inputFormatters: [FilteringTextInputFormatter.digitsOnly],
                        validator: (value) {
                          if (value == null || value.isEmpty) {
                            return '장비 이력 ID는 필수입니다';
                          }
                          return null;
                        },
                        onChanged: (value) {
                          _selectedEquipmentHistoryId = int.tryParse(value);
                        },
                        initialValue: _selectedEquipmentHistoryId?.toString(),
                      ),
                      const SizedBox(height: 20),

                      // 임대 기간 (백엔드 필수 필드)
                      Text('임대 기간', style: Theme.of(context).textTheme.titleMedium),
                      const SizedBox(height: 12),

                      Row(
                        children: [
                          Expanded(
                            child: InkWell(
                              onTap: _selectStartDate,
                              child: Container(
                                padding: const EdgeInsets.all(16),
                                decoration: BoxDecoration(
                                  border: Border.all(color: Colors.grey),
                                  borderRadius: BorderRadius.circular(4),
                                ),
                                child: Row(
                                  children: [
                                    const Icon(Icons.calendar_today),
                                    const SizedBox(width: 8),
                                    Column(
                                      crossAxisAlignment: CrossAxisAlignment.start,
                                      children: [
                                        const Text('시작일 *', style: TextStyle(fontSize: 12, color: Colors.grey)),
                                        Text(
                                          '${_startDate.year}-${_startDate.month.toString().padLeft(2, '0')}-${_startDate.day.toString().padLeft(2, '0')}',
                                          style: const TextStyle(fontSize: 16),
                                        ),
                                      ],
                                    ),
                                  ],
                                ),
                              ),
                            ),
                          ),
                          const SizedBox(width: 16),
                          Expanded(
                            child: InkWell(
                              onTap: _selectEndDate,
                              child: Container(
                                padding: const EdgeInsets.all(16),
                                decoration: BoxDecoration(
                                  border: Border.all(color: Colors.grey),
                                  borderRadius: BorderRadius.circular(4),
                                ),
                                child: Row(
                                  children: [
                                    const Icon(Icons.calendar_today),
                                    const SizedBox(width: 8),
                                    Column(
                                      crossAxisAlignment: CrossAxisAlignment.start,
                                      children: [
                                        const Text('종료일 *', style: TextStyle(fontSize: 12, color: Colors.grey)),
                                        Text(
                                          _endDate != null 
                                              ? '${_endDate!.year}-${_endDate!.month.toString().padLeft(2, '0')}-${_endDate!.day.toString().padLeft(2, '0')}'
                                              : '날짜 선택',
                                          style: TextStyle(
                                            fontSize: 16,
                                            color: _endDate != null ? Colors.black : Colors.grey,
                                          ),
                                        ),
                                      ],
                                    ),
                                  ],
                                ),
                              ),
                            ),
                          ),
                        ],
                      ),
                      const SizedBox(height: 16),

                      // 임대 기간 표시
                      if (_endDate != null)
                        Container(
                          padding: const EdgeInsets.all(12),
                          decoration: BoxDecoration(
                            color: Colors.blue.shade50,
                            borderRadius: BorderRadius.circular(8),
                            border: Border.all(color: Colors.blue.shade200),
                          ),
                          child: Row(
                            mainAxisAlignment: MainAxisAlignment.center,
                            children: [
                              const Icon(Icons.info, color: Colors.blue),
                              const SizedBox(width: 8),
                              Text(
                                '임대 기간: ${_endDate!.difference(_startDate).inDays + 1}일',
                                style: const TextStyle(fontWeight: FontWeight.bold),
                              ),
                            ],
                          ),
                        ),
                    ],
                  ),
                ),
              ),
            ),

            const SizedBox(height: 24),

            // 버튼
            Row(
              mainAxisAlignment: MainAxisAlignment.end,
              children: [
                TextButton(
                  onPressed: _isLoading ? null : () => Navigator.of(context).pop(),
                  child: const Text('취소'),
                ),
                const SizedBox(width: 8),
                ElevatedButton(
                  onPressed: _isLoading ? null : _submit,
                  child: _isLoading
                      ? const SizedBox(
                          width: 20,
                          height: 20,
                          child: CircularProgressIndicator(strokeWidth: 2),
                        )
                      : Text(widget.rent != null ? '수정' : '생성'),
                ),
              ],
            ),
          ],
        ),
      ),
    );
  }
}