import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:image_picker/image_picker.dart';
import 'package:file_picker/file_picker.dart';
import '../../core/navigation_provider.dart';

final reportProvider = NotifierProvider<ReportNotifier, ReportState>(ReportNotifier.new);

class ReportState {
  final List<ReportItem> reports;
  final String? uploadingImage;
  final bool isAnalyzing;
  final ReportAnalysis? currentAnalysis;

  ReportState({
    this.reports = const [],
    this.uploadingImage,
    this.isAnalyzing = false,
    this.currentAnalysis,
  });

  ReportState copyWith({
    List<ReportItem>? reports,
    String? uploadingImage,
    bool? isAnalyzing,
    ReportAnalysis? currentAnalysis,
  }) {
    return ReportState(
      reports: reports ?? this.reports,
      uploadingImage: uploadingImage ?? this.uploadingImage,
      isAnalyzing: isAnalyzing ?? this.isAnalyzing,
      currentAnalysis: currentAnalysis ?? this.currentAnalysis,
    );
  }
}

class ReportItem {
  final String id;
  final String title;
  final String type;
  final DateTime uploadedAt;
  final String? imagePath;
  final bool hasAnalysis;

  ReportItem({
    required this.id,
    required this.title,
    required this.type,
    required this.uploadedAt,
    this.imagePath,
    this.hasAnalysis = false,
  });
}

class ReportAnalysis {
  final String reportId;
  final String reportType;
  final List<Indicator> indicators;
  final String summary;

  ReportAnalysis({
    required this.reportId,
    required this.reportType,
    required this.indicators,
    required this.summary,
  });
}

class Indicator {
  final String name;
  final String value;
  final String unit;
  final String status;
  final String? referenceRange;

  Indicator({
    required this.name,
    required this.value,
    required this.unit,
    required this.status,
    this.referenceRange,
  });
}

class ReportNotifier extends Notifier<ReportState> {
  static final _mockReports = [
    ReportItem(
      id: '1',
      title: '血常规检查',
      type: '血液检查',
      uploadedAt: DateTime.now().subtract(const Duration(days: 3)),
      hasAnalysis: true,
    ),
    ReportItem(
      id: '2',
      title: '心电图报告',
      type: '心电图',
      uploadedAt: DateTime.now().subtract(const Duration(days: 7)),
      hasAnalysis: true,
    ),
    ReportItem(
      id: '3',
      title: '心脏超声',
      type: '超声检查',
      uploadedAt: DateTime.now().subtract(const Duration(days: 14)),
      hasAnalysis: false,
    ),
  ];

  @override
  ReportState build() => ReportState(reports: _mockReports);

  void uploadImage(String path) async {
    state = state.copyWith(uploadingImage: path, isAnalyzing: true);
    await Future.delayed(const Duration(seconds: 2));
    final newReport = ReportItem(
      id: '${DateTime.now().millisecondsSinceEpoch}',
      title: '检查报告',
      type: '影像报告',
      uploadedAt: DateTime.now(),
      imagePath: path,
      hasAnalysis: true,
    );
    state = state.copyWith(
      reports: [newReport, ...state.reports],
      uploadingImage: null,
      isAnalyzing: false,
      currentAnalysis: _mockAnalysis,
    );
  }

  void uploadFile(String path) async {
    state = state.copyWith(isAnalyzing: true);
    await Future.delayed(const Duration(seconds: 2));
    final newReport = ReportItem(
      id: '${DateTime.now().millisecondsSinceEpoch}',
      title: '检查报告',
      type: 'PDF文档',
      uploadedAt: DateTime.now(),
      hasAnalysis: true,
    );
    state = state.copyWith(
      reports: [newReport, ...state.reports],
      isAnalyzing: false,
      currentAnalysis: _mockAnalysis,
    );
  }

  void viewAnalysis(String reportId) {
    state = state.copyWith(currentAnalysis: _mockAnalysis);
  }

  void clearAnalysis() {
    state = state.copyWith(currentAnalysis: null);
  }
}

final _mockAnalysis = ReportAnalysis(
  reportId: '1',
  reportType: '血常规检查',
  indicators: [
    Indicator(name: '白细胞计数', value: '7.5', unit: '×10^9/L', status: 'normal', referenceRange: '4.0-10.0'),
    Indicator(name: '红细胞计数', value: '4.2', unit: '×10^12/L', status: 'normal', referenceRange: '3.5-5.5'),
    Indicator(name: '血红蛋白', value: '128', unit: 'g/L', status: 'low', referenceRange: '130-175'),
    Indicator(name: '血小板计数', value: '185', unit: '×10^9/L', status: 'normal', referenceRange: '100-300'),
    Indicator(name: '中性粒细胞百分比', value: '65', unit: '%', status: 'normal', referenceRange: '50-70'),
    Indicator(name: '淋巴细胞百分比', value: '28', unit: '%', status: 'normal', referenceRange: '20-40'),
  ],
  summary: '整体来看，您的血常规检查基本正常。血红蛋白略低于正常范围，建议适当补充营养，多吃富含铁质的食物如红肉、动物肝脏等。如有疲劳、头晕等症状，建议咨询医生进一步检查。',
);

/// 报告列表页
class ReportListPage extends ConsumerWidget {
  const ReportListPage({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final state = ref.watch(reportProvider);

    if (state.isAnalyzing) {
      return Scaffold(
        appBar: AppBar(title: const Text('看报告')),
        body: const Center(
          child: Column(mainAxisSize: MainAxisSize.min, children: [
            CircularProgressIndicator(color: Color(0xFF635BFF)),
            SizedBox(height: 16),
            Text('AI 正在分析报告...'),
          ]),
        ),
      );
    }

    return Scaffold(
      appBar: AppBar(
        title: const Text('看报告'),
        centerTitle: true,
      ),
      floatingActionButton: _buildUploadButton(context, ref),
      body: state.reports.isEmpty
          ? _buildEmptyState(context)
          : ListView.builder(
              padding: const EdgeInsets.all(16),
              itemCount: state.reports.length,
              itemBuilder: (context, index) => _buildReportCard(context, ref, state.reports[index]),
            ),
    );
  }

  Widget _buildUploadButton(BuildContext context, WidgetRef ref) {
    return FloatingActionButton(
      onPressed: () => _showUploadOptions(context, ref),
      backgroundColor: const Color(0xFF635BFF),
      child: const Icon(Icons.add),
    );
  }

  void _showUploadOptions(BuildContext context, WidgetRef ref) {
    showModalBottomSheet(
      context: context,
      builder: (ctx) => SafeArea(
        child: Wrap(children: [
          ListTile(
            leading: const Icon(Icons.camera_alt),
            title: const Text('拍照上传'),
            onTap: () async {
              Navigator.pop(ctx);
              final picker = ImagePicker();
              final picked = await picker.pickImage(source: ImageSource.camera, imageQuality: 85);
              if (picked != null) {
                ref.read(reportProvider.notifier).uploadImage(picked.path);
              }
            },
          ),
          ListTile(
            leading: const Icon(Icons.photo_library),
            title: const Text('从相册选择'),
            onTap: () async {
              Navigator.pop(ctx);
              final picker = ImagePicker();
              final picked = await picker.pickImage(source: ImageSource.gallery, imageQuality: 85);
              if (picked != null) {
                ref.read(reportProvider.notifier).uploadImage(picked.path);
              }
            },
          ),
          ListTile(
            leading: const Icon(Icons.file_open),
            title: const Text('上传PDF文件'),
            onTap: () async {
              Navigator.pop(ctx);
              final result = await FilePicker.platform.pickFiles(type: FileType.custom, allowedExtensions: ['pdf']);
              if (result != null && result.files.isNotEmpty) {
                ref.read(reportProvider.notifier).uploadFile(result.files.first.path!);
              }
            },
          ),
        ]),
      ),
    );
  }

  Widget _buildEmptyState(BuildContext context) {
    return Center(
      child: Column(mainAxisSize: MainAxisSize.min, children: [
        Container(
          width: 120,
          height: 120,
          decoration: BoxDecoration(
            color: const Color(0xFFF5F3FF),
            borderRadius: BorderRadius.circular(60),
          ),
          child: const Icon(Icons.file_open, size: 48, color: Color(0xFF635BFF)),
        ),
        const SizedBox(height: 20),
        const Text('暂无检查报告', style: TextStyle(fontSize: 18, fontWeight: FontWeight.w500)),
        const SizedBox(height: 8),
        const Text('点击下方按钮上传报告', style: TextStyle(fontSize: 14, color: Color(0xFF999999))),
      ]),
    );
  }

  Widget _buildReportCard(BuildContext context, WidgetRef ref, ReportItem report) {
    return Container(
      margin: const EdgeInsets.only(bottom: 12),
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(16),
        boxShadow: [BoxShadow(color: const Color(0xFF635BFF).withAlpha(10), blurRadius: 4, offset: const Offset(0, 2))],
      ),
      child: ListTile(
        leading: Container(
          width: 48,
          height: 48,
          decoration: BoxDecoration(
            color: const Color(0xFFF5F3FF),
            borderRadius: BorderRadius.circular(12),
          ),
          child: _getReportIcon(report.type),
        ),
        title: Text(report.title, style: const TextStyle(fontSize: 16, fontWeight: FontWeight.w600)),
        subtitle: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
          Text(report.type, style: TextStyle(fontSize: 14, color: Colors.grey[500])),
          Text(_formatDate(report.uploadedAt), style: TextStyle(fontSize: 12, color: Colors.grey[400])),
        ]),
        trailing: report.hasAnalysis
            ? const Icon(Icons.check_circle, size: 20, color: Color(0xFF43A047))
            : const Icon(Icons.arrow_forward_ios, size: 18, color: Color(0xFFCCCCCC)),
        onTap: () {
          ref.read(reportProvider.notifier).viewAnalysis(report.id);
          pushRoute(ref, 'reportDetail', params: {'id': report.id});
        },
      ),
    );
  }

  Widget _getReportIcon(String type) {
    final icons = {
      '血液检查': const Icon(Icons.bloodtype, size: 24, color: Color(0xFF635BFF)),
      '心电图': const Icon(Icons.monitor_heart, size: 24, color: Color(0xFF635BFF)),
      '超声检查': const Icon(Icons.image, size: 24, color: Color(0xFF635BFF)),
      '影像报告': const Icon(Icons.image, size: 24, color: Color(0xFF635BFF)),
      'PDF文档': const Icon(Icons.picture_as_pdf, size: 24, color: Color(0xFF635BFF)),
    };
    return icons[type] ?? const Icon(Icons.description, size: 24, color: Color(0xFF635BFF));
  }

  String _formatDate(DateTime date) {
    final now = DateTime.now();
    final diff = now.difference(date);
    if (diff.inDays == 0) return '今天';
    if (diff.inDays == 1) return '昨天';
    if (diff.inDays < 7) return '${diff.inDays}天前';
    return '${date.month}月${date.day}日';
  }
}

/// 报告详情页
class ReportDetailPage extends ConsumerWidget {
  final String id;
  const ReportDetailPage({super.key, required this.id});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final analysis = ref.watch(reportProvider.select((s) => s.currentAnalysis));

    if (analysis == null) {
      return Scaffold(
        appBar: AppBar(title: const Text('报告详情')),
        body: const Center(child: Text('暂无分析数据')),
      );
    }

    return Scaffold(
      appBar: AppBar(
        title: const Text('报告解读'),
        leading: IconButton(
          icon: const Icon(Icons.arrow_back),
          onPressed: () {
            ref.read(reportProvider.notifier).clearAnalysis();
            popRoute(ref);
          },
        ),
      ),
      body: SingleChildScrollView(
        padding: const EdgeInsets.all(16),
        child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
          _buildReportHeader(analysis),
          const SizedBox(height: 20),
          _buildAnalysisSection(analysis),
          const SizedBox(height: 20),
          _buildSummarySection(analysis),
          const SizedBox(height: 30),
        ]),
      ),
    );
  }

  Widget _buildReportHeader(ReportAnalysis analysis) {
    return Container(
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: const Color(0xFFF5F3FF),
        borderRadius: BorderRadius.circular(16),
      ),
      child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
        Row(children: [
          const Text('📋', style: TextStyle(fontSize: 24)),
          const SizedBox(width: 12),
          Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
            Text(analysis.reportType, style: const TextStyle(fontSize: 18, fontWeight: FontWeight.w600)),
            const SizedBox(height: 4),
            const Text('AI 预解读结果', style: TextStyle(fontSize: 14, color: Color(0xFF666666))),
          ]),
        ]),
      ]),
    );
  }

  Widget _buildAnalysisSection(ReportAnalysis analysis) {
    return Container(
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(16),
        border: Border.all(color: const Color(0xFFE8E6FF), width: 1.5),
      ),
      child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
        Padding(
          padding: const EdgeInsets.all(16),
          child: Row(children: [
            const Text('🧪', style: TextStyle(fontSize: 20)),
            const SizedBox(width: 8),
            const Text('指标分析', style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600)),
          ]),
        ),
        ...analysis.indicators.map((ind) => _buildIndicatorRow(ind)),
      ]),
    );
  }

  Widget _buildIndicatorRow(Indicator ind) {
    Color statusColor;
    IconData statusIcon;
    switch (ind.status) {
      case 'high':
        statusColor = const Color(0xFFE53935);
        statusIcon = Icons.arrow_upward;
        break;
      case 'low':
        statusColor = const Color(0xFFF9A825);
        statusIcon = Icons.arrow_downward;
        break;
      default:
        statusColor = const Color(0xFF43A047);
        statusIcon = Icons.check_circle;
    }

    return Container(
      margin: const EdgeInsets.symmetric(horizontal: 16),
      padding: const EdgeInsets.symmetric(vertical: 12),
      decoration: const BoxDecoration(border: Border(bottom: BorderSide(color: Color(0xFFF0F0F0)))),
      child: Row(children: [
        Expanded(
          child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
            Text(ind.name, style: const TextStyle(fontSize: 14)),
            if (ind.referenceRange != null)
              Text('参考值: ${ind.referenceRange}', style: TextStyle(fontSize: 12, color: Colors.grey[400])),
          ]),
        ),
        const SizedBox(width: 16),
        Column(children: [
          Text('${ind.value} ${ind.unit}', style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600, color: statusColor)),
          Icon(statusIcon, size: 16, color: statusColor),
        ]),
      ]),
    );
  }

  Widget _buildSummarySection(ReportAnalysis analysis) {
    return Container(
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: const Color(0xFFFEF3C7),
        borderRadius: BorderRadius.circular(16),
      ),
      child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
        Row(children: [
          const Text('💡', style: TextStyle(fontSize: 20)),
          const SizedBox(width: 8),
          const Text('综合解读', style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600, color: Color(0xFFD97706))),
        ]),
        const SizedBox(height: 12),
        Text(analysis.summary, style: const TextStyle(fontSize: 14, color: Color(0xFF92400E), height: 1.6)),
        const SizedBox(height: 12),
        Container(
          padding: const EdgeInsets.all(12),
          decoration: BoxDecoration(
            color: Colors.white,
            borderRadius: BorderRadius.circular(12),
          ),
          child: const Text('⚠️ AI 解读仅供参考，请以医生诊断为准', style: TextStyle(fontSize: 13, color: Color(0xFFD97706))),
        ),
      ]),
    );
  }
}