import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:shadcn_ui/shadcn_ui.dart';
import 'package:superport/data/models/model/model_dto.dart';
import 'package:superport/screens/model/controllers/model_controller.dart';
import 'package:superport/screens/model/model_form_dialog.dart';
import 'package:superport/screens/common/layouts/base_list_screen.dart';
import 'package:superport/screens/common/widgets/standard_action_bar.dart';
import 'package:superport/screens/common/theme_shadcn.dart';
import 'package:superport/injection_container.dart' as di;

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

  @override
  State<ModelListScreen> createState() => _ModelListScreenState();
}

class _ModelListScreenState extends State<ModelListScreen> {
  late final ModelController _controller;

  @override
  void initState() {
    super.initState();
    _controller = di.sl<ModelController>();
    WidgetsBinding.instance.addPostFrameCallback((_) {
      _controller.loadInitialData();
    });
  }

  @override
  Widget build(BuildContext context) {
    return ChangeNotifierProvider.value(
      value: _controller,
      child: Scaffold(
        backgroundColor: ShadcnTheme.background,
        appBar: AppBar(
          title: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Text(
                '모델 관리',
                style: ShadcnTheme.headingH4,
              ),
              Text(
                '장비 모델 정보를 관리합니다',
                style: ShadcnTheme.bodySmall,
              ),
            ],
          ),
          backgroundColor: ShadcnTheme.background,
          elevation: 0,
        ),
        body: Consumer<ModelController>(
          builder: (context, controller, child) {
            return BaseListScreen(
              headerSection: _buildStatisticsCards(controller),
              searchBar: _buildSearchBar(controller),
              actionBar: _buildActionBar(),
              dataTable: _buildDataTable(controller),
              pagination: _buildPagination(controller),
              isLoading: controller.isLoading,
              error: controller.errorMessage,
              onRefresh: () => controller.loadInitialData(),
            );
          },
        ),
      ),
    );
  }

  Widget _buildStatisticsCards(ModelController controller) {
    if (controller.isLoading) return const SizedBox();
    
    return Row(
      children: [
        _buildStatCard(
          '전체 모델',
          controller.models.length.toString(),
          Icons.category,
          ShadcnTheme.primary,
        ),
        const SizedBox(width: ShadcnTheme.spacing4),
        _buildStatCard(
          '제조사',
          controller.vendors.length.toString(),
          Icons.business,
          ShadcnTheme.success,
        ),
        const SizedBox(width: ShadcnTheme.spacing4),
        _buildStatCard(
          '활성 모델',
          controller.models.where((m) => !m.isDeleted).length.toString(),
          Icons.check_circle,
          ShadcnTheme.info,
        ),
      ],
    );
  }

  Widget _buildSearchBar(ModelController controller) {
    return Row(
      children: [
        Expanded(
          flex: 2,
          child: ShadInput(
            placeholder: const Text('모델명 검색...'),
            onChanged: controller.setSearchQuery,
          ),
        ),
        const SizedBox(width: ShadcnTheme.spacing4),
        Expanded(
          child: ShadSelect<int?>(
            placeholder: const Text('제조사 선택'),
            options: [
              const ShadOption<int?>(
                value: null,
                child: Text('전체'),
              ),
              ...controller.vendors.map(
                (vendor) => ShadOption<int?>(
                  value: vendor.id,
                  child: Text(vendor.name),
                ),
              ),
            ],
            selectedOptionBuilder: (context, value) {
              if (value == null) {
                return const Text('전체');
              }
              try {
                final vendor = controller.vendors.firstWhere((v) => v.id == value);
                return Text(vendor.name);
              } catch (_) {
                return const Text('전체');
              }
            },
            onChanged: controller.setVendorFilter,
          ),
        ),
      ],
    );
  }

  Widget _buildActionBar() {
    return StandardActionBar(
      totalCount: _controller.totalCount,
      leftActions: const [
        Text('모델 목록', style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold)),
      ],
      rightActions: [
        ShadButton.outline(
          onPressed: () => _controller.refreshModels(),
          child: const Icon(Icons.refresh, size: 16),
        ),
        const SizedBox(width: ShadcnTheme.spacing2),
        ShadButton(
          onPressed: _showCreateDialog,
          child: const Row(
            mainAxisSize: MainAxisSize.min,
            children: [
              Icon(Icons.add, size: 16),
              SizedBox(width: ShadcnTheme.spacing1),
              Text('새 모델 등록'),
            ],
          ),
        ),
      ],
    );
  }

  /// 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('제조사', flex: 2, useExpanded: true, minWidth: 100),
      _buildHeaderCell('모델명', flex: 3, useExpanded: true, minWidth: 120),
      _buildHeaderCell('등록일', flex: 2, useExpanded: true, minWidth: 100),
      _buildHeaderCell('상태', flex: 0, useExpanded: false, minWidth: 80),
      _buildHeaderCell('작업', flex: 0, useExpanded: false, minWidth: 100),
    ];
  }

  /// 테이블 행 빌더
  Widget _buildTableRow(ModelDto model, int index) {
    final vendor = _controller.getVendorById(model.vendorsId);
    
    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(
              model.id.toString(),
              style: ShadcnTheme.bodySmall,
            ),
            flex: 0,
            useExpanded: false,
            minWidth: 60,
          ),
          _buildDataCell(
            Text(
              vendor?.name ?? '알 수 없음',
              style: ShadcnTheme.bodyMedium,
            ),
            flex: 2,
            useExpanded: true,
            minWidth: 100,
          ),
          _buildDataCell(
            Text(
              model.name,
              style: ShadcnTheme.bodyMedium.copyWith(
                fontWeight: FontWeight.w500,
              ),
            ),
            flex: 3,
            useExpanded: true,
            minWidth: 120,
          ),
          _buildDataCell(
            Text(
              model.registeredAt != null
                  ? DateFormat('yyyy-MM-dd').format(model.registeredAt)
                  : '-',
              style: ShadcnTheme.bodySmall,
            ),
            flex: 2,
            useExpanded: true,
            minWidth: 100,
          ),
          _buildDataCell(
            _buildStatusChip(model.isDeleted),
            flex: 0,
            useExpanded: false,
            minWidth: 80,
          ),
          _buildDataCell(
            Row(
              mainAxisSize: MainAxisSize.min,
              children: [
                ShadButton.ghost(
                  onPressed: () => _showEditDialog(model),
                  child: const Icon(Icons.edit, size: 16),
                ),
                const SizedBox(width: ShadcnTheme.spacing1),
                ShadButton.ghost(
                  onPressed: () => _showDeleteConfirmDialog(model),
                  child: const Icon(Icons.delete, size: 16),
                ),
              ],
            ),
            flex: 0,
            useExpanded: false,
            minWidth: 100,
          ),
        ],
      ),
    );
  }

  Widget _buildDataTable(ModelController controller) {
    final models = controller.models;
    
    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: models.isEmpty
                ? Center(
                    child: Column(
                      mainAxisAlignment: MainAxisAlignment.center,
                      children: [
                        Icon(
                          Icons.category_outlined,
                          size: 64,
                          color: ShadcnTheme.mutedForeground,
                        ),
                        const SizedBox(height: 16),
                        Text(
                          '등록된 모델이 없습니다',
                          style: ShadcnTheme.bodyMedium.copyWith(
                            color: ShadcnTheme.mutedForeground,
                          ),
                        ),
                      ],
                    ),
                  )
                : ListView.builder(
                    itemCount: models.length,
                    itemBuilder: (context, index) => _buildTableRow(models[index], index),
                  ),
          ),
        ],
      ),
    );
  }

  Widget _buildPagination(ModelController controller) {
    // 모델 목록은 현재 페이지네이션이 없는 것 같으니 빈 위젯 반환
    return const SizedBox();
  }

  Widget _buildStatCard(
    String title,
    String value,
    IconData icon,
    Color color,
  ) {
    return Expanded(
      child: ShadCard(
        child: Padding(
          padding: const EdgeInsets.all(ShadcnTheme.spacing4),
          child: Row(
            children: [
              Container(
                padding: const EdgeInsets.all(ShadcnTheme.spacing3),
                decoration: BoxDecoration(
                  color: color.withValues(alpha: 0.1),
                  borderRadius: BorderRadius.circular(ShadcnTheme.radiusLg),
                ),
                child: Icon(
                  icon,
                  color: color,
                  size: 20,
                ),
              ),
              const SizedBox(width: ShadcnTheme.spacing3),
              Expanded(
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Text(
                      title,
                      style: ShadcnTheme.bodySmall,
                    ),
                    Text(
                      value,
                      style: ShadcnTheme.headingH6.copyWith(
                        color: color,
                      ),
                    ),
                  ],
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }

  Widget _buildStatusChip(bool isDeleted) {
    if (isDeleted) {
      return ShadBadge.destructive(
        child: const Text('비활성'),
      );
    } else {
      return ShadBadge.secondary(
        child: const Text('활성'),
      );
    }
  }

  void _showCreateDialog() {
    showDialog(
      context: context,
      builder: (context) => ModelFormDialog(
        controller: _controller,
      ),
    );
  }

  void _showEditDialog(ModelDto model) {
    showDialog(
      context: context,
      builder: (context) => ModelFormDialog(
        controller: _controller,
        model: model,
      ),
    );
  }

  void _showDeleteConfirmDialog(ModelDto model) {
    showDialog(
      context: context,
      builder: (context) => ShadDialog(
        title: const Text('모델 삭제'),
        description: Text('${model.name} 모델을 삭제하시겠습니까?'),
        actions: [
          ShadButton.outline(
            onPressed: () => Navigator.of(context).pop(),
            child: const Text('취소'),
          ),
          ShadButton.destructive(
            onPressed: () async {
              Navigator.of(context).pop();
              await _controller.deleteModel(model.id);
            },
            child: const Text('삭제'),
          ),
        ],
      ),
    );
  }
}