import 'dart:convert';
import 'dart:io';
import 'package:dio/dio.dart';
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 'package:shadcn_ui/shadcn_ui.dart';
import '../../core/app_colors.dart';
import '../../core/app_theme.dart';
import '../../core/navigation_provider.dart';
import '../../providers/auth_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;
  final String status;           // PendingDoctor | DoctorReviewed
  final String? severity;        // Normal | Abnormal | Severe | Critical
  final String? doctorComment;
  final String? doctorRecommendation;
  final String? doctorName;
  final DateTime? reviewedAt;

  ReportItem({
    required this.id,
    required this.title,
    required this.type,
    required this.uploadedAt,
    this.imagePath,
    this.hasAnalysis = false,
    this.status = 'PendingDoctor',
    this.severity,
    this.doctorComment,
    this.doctorRecommendation,
    this.doctorName,
    this.reviewedAt,
  });
}

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> {
  @override
  ReportState build() {
    Future.microtask(() => loadReports());
    return ReportState();
  }

  Future<void> loadReports() async {
    try {
      final api = ref.read(apiClientProvider);
      final res = await api.get('/api/reports');
      final list = (res.data['data'] as List?) ?? [];
      final reports = list.map((r) {
        final m = r as Map<String, dynamic>;
        final rawTitle = m['title']?.toString() ?? '';
        final rawCat = m['category']?.toString() ?? '';
        final title = rawTitle.isNotEmpty && rawTitle != 'Other' && rawTitle != 'other'
            ? rawTitle
            : _catTitle(rawCat);
        return ReportItem(
          id: m['id']?.toString() ?? '',
          title: title,
          type: m['fileType']?.toString() ?? 'Image',
          uploadedAt: DateTime.tryParse(m['createdAt']?.toString() ?? '') ?? DateTime.now(),
          hasAnalysis: m['aiSummary'] != null,
          status: m['status']?.toString() ?? 'PendingDoctor',
          severity: m['severity']?.toString(),
          doctorComment: m['doctorComment']?.toString(),
          doctorRecommendation: m['doctorRecommendation']?.toString(),
          doctorName: m['doctorName']?.toString(),
          reviewedAt: DateTime.tryParse(m['reviewedAt']?.toString() ?? ''),
        );
      }).toList();
      state = state.copyWith(reports: reports);
    } catch (e) {
      debugPrint('[Report] 加载报告列表失败: $e');
    }
  }

  void fetchReportDetail(String reportId) async {
    try {
      final api = ref.read(apiClientProvider);
      final res = await api.get('/api/reports/$reportId');
      final m = (res.data['data'] as Map<String, dynamic>?) ?? {};
      if (m.isEmpty) {
        state = state.copyWith(currentAnalysis: _emptyAnalysis(reportId));
        return;
      }
      final indicators = _parseIndicators(m['aiIndicators']?.toString());
      final rawTitle = m['title']?.toString() ?? '';
      final rawCat = m['category']?.toString() ?? '';
      final displayType = rawTitle.isNotEmpty && rawTitle != 'Other'
          ? rawTitle
          : _catTitle(rawCat);
      final analysis = ReportAnalysis(
        reportId: m['id']?.toString() ?? reportId,
        reportType: displayType,
        indicators: indicators,
        summary: m['aiSummary']?.toString() ?? '',
      );
      state = state.copyWith(currentAnalysis: analysis);
    } catch (_) {
      state = state.copyWith(currentAnalysis: _emptyAnalysis(reportId));
    }
  }

  ReportAnalysis _emptyAnalysis(String reportId) => ReportAnalysis(
    reportId: reportId,
    reportType: '检查报告',
    indicators: [],
    summary: '暂无数据，请下拉刷新重试',
  );

  List<Indicator> _parseIndicators(String? jsonStr) {
    if (jsonStr == null || jsonStr.isEmpty) return [];
    try {
      final list = jsonDecode(jsonStr) as List;
      return list.map((item) {
        final m = item as Map<String, dynamic>;
        return Indicator(
          name: m['name']?.toString() ?? '',
          value: m['value']?.toString() ?? '',
          unit: m['unit']?.toString() ?? '',
          status: m['status']?.toString() ?? 'normal',
          referenceRange: m['referenceRange']?.toString(),
        );
      }).toList();
    } catch (_) {
      return [];
    }
  }

  void uploadImage(String path) async {
    state = state.copyWith(uploadingImage: path, isAnalyzing: true);
    try {
      final api = ref.read(apiClientProvider);
      final file = File(path);
      final formData = FormData.fromMap({
        'file': await MultipartFile.fromFile(file.path, filename: file.path.split('/').last),
      });
      // 直接上传到报告端点，后端自动触发 VLM+LLM 分析
      final createRes = await api.dio.post('/api/reports', data: formData);
      final data = createRes.data;
      final reportId = data is Map ? (data['data']?['id']?.toString() ?? '') : '';

      state = state.copyWith(isAnalyzing: false, uploadingImage: null);
      loadReports();
    } catch (_) {
      state = state.copyWith(isAnalyzing: false, uploadingImage: null);
    }
  }

  void uploadFile(String path) => uploadImage(path);

  void viewAnalysis(String reportId) {
    fetchReportDetail(reportId);
  }

  Future<void> deleteReport(String id) async {
    try {
      await ref.read(apiClientProvider).delete('/api/reports/$id');
      loadReports();
    } catch (e) {
      debugPrint('[Report] 删除失败: $e');
    }
  }

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

/// 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 GradientScaffold(
        appBar: AppBar(title: const Text('报告管理')),
        body: const Center(
          child: Column(mainAxisSize: MainAxisSize.min, children: [
            CircularProgressIndicator(color: AppColors.primary),
            SizedBox(height: 16),
            Text('AI 正在分析报告...', style: TextStyle(fontSize: 16, color: AppColors.textSecondary)),
          ]),
        ),
      );
    }

    return GradientScaffold(
      appBar: AppBar(
        leading: IconButton(icon: const Icon(Icons.arrow_back), onPressed: () => popRoute(ref)),
        title: const Text('报告管理'),
        centerTitle: true,
      ),
      floatingActionButton: _buildUploadButton(context, ref),
      body: RefreshIndicator(
          onRefresh: () async => ref.read(reportProvider.notifier).loadReports(),
          child: state.reports.isEmpty
              ? ListView(children: [_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: AppColors.primary,
      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
      child: const Icon(Icons.add, size: 28, color: Colors.white),
    );
  }

  void _showUploadOptions(BuildContext context, WidgetRef ref) {
    showModalBottomSheet(
      context: context,
      backgroundColor: Colors.white,
      shape: const RoundedRectangleBorder(borderRadius: BorderRadius.vertical(top: Radius.circular(20))),
      builder: (ctx) => SafeArea(
        child: Padding(
          padding: const EdgeInsets.symmetric(vertical: 8),
          child: Wrap(children: [
            ListTile(
              leading: const Icon(Icons.camera_alt_outlined, color: AppColors.primary),
              title: const Text('拍照上传', style: TextStyle(fontSize: 17)),
              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_outlined, color: AppColors.primary),
              title: const Text('从相册选择', style: TextStyle(fontSize: 17)),
              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.picture_as_pdf_outlined, color: AppColors.primary),
              title: const Text('上传PDF文件', style: TextStyle(fontSize: 17)),
              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: 100, height: 100,
          decoration: BoxDecoration(color: AppColors.cardInner, borderRadius: BorderRadius.circular(50)),
          child: const Icon(Icons.description_outlined, size: 44, color: AppColors.textHint),
        ),
        const SizedBox(height: 20),
        const Text('暂无检查报告', style: TextStyle(fontSize: 20, fontWeight: FontWeight.w500, color: AppColors.textPrimary)),
        const SizedBox(height: 8),
        const Text('点击右下角按钮上传报告', style: TextStyle(fontSize: 16, color: AppColors.textHint)),
      ]),
    );
  }

  Widget _buildReportCard(BuildContext context, WidgetRef ref, ReportItem report) {
    final displayTitle = (report.title == 'Other' || report.title == 'other') ? '检查报告' : report.title;
    return Container(
      margin: const EdgeInsets.only(bottom: 12),
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(20),
        boxShadow: AppColors.cardShadowLight,
      ),
      child: Material(
        color: Colors.transparent,
        borderRadius: BorderRadius.circular(20),
        child: InkWell(
          onTap: () => pushRoute(ref, 'aiAnalysis', params: {'id': report.id}),
          borderRadius: BorderRadius.circular(20),
          child: Padding(
            padding: const EdgeInsets.all(14),
            child: Row(children: [
              Container(
                width: 48, height: 48,
                decoration: BoxDecoration(color: Colors.white, borderRadius: BorderRadius.circular(12), border: Border.all(color: AppColors.borderLight)),
                child: Icon(Icons.description_outlined, size: 26, color: AppColors.primary),
              ),
              const SizedBox(width: 14),
              Expanded(
                child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
                  Text(displayTitle, style: const TextStyle(fontSize: 18, fontWeight: FontWeight.w600, color: AppColors.textPrimary)),
                  const SizedBox(height: 4),
                  Text(_formatDate(report.uploadedAt), style: const TextStyle(fontSize: 14, color: AppColors.textHint)),
                ]),
              ),
              if (report.status == 'DoctorReviewed')
                Container(
                  padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 3),
                  decoration: BoxDecoration(color: AppColors.successLight, borderRadius: BorderRadius.circular(8)),
                  child: const Text('已审核', style: TextStyle(fontSize: 13, color: AppColors.success, fontWeight: FontWeight.w500)),
                )
              else if (!report.hasAnalysis)
                Container(
                  padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 3),
                  decoration: BoxDecoration(color: AppColors.cardInner, borderRadius: BorderRadius.circular(8)),
                  child: const Text('分析中', style: TextStyle(fontSize: 13, color: AppColors.textHint, fontWeight: FontWeight.w500)),
                )
              else
                Container(
                  padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 3),
                  decoration: BoxDecoration(color: AppColors.warningLight, borderRadius: BorderRadius.circular(8)),
                  child: const Text('待审核', style: TextStyle(fontSize: 13, color: AppColors.warning, fontWeight: FontWeight.w500)),
                ),
              const SizedBox(width: 4),
              GestureDetector(
                onTap: () => _confirmDelete(context, ref, report.id),
                child: const Padding(
                  padding: EdgeInsets.all(6),
                  child: Icon(Icons.delete_outline, size: 20, color: AppColors.textHint),
                ),
              ),
            ]),
          ),
        ),
      ),
    );
  }

  void _confirmDelete(BuildContext context, WidgetRef ref, String id) {
    showDialog(
      context: context,
      builder: (ctx) => AlertDialog(
        title: const Text('删除报告'),
        content: const Text('确定要删除这份报告吗？'),
        actions: [
          TextButton(onPressed: () => Navigator.pop(ctx), child: const Text('取消')),
          TextButton(
            onPressed: () { Navigator.pop(ctx); ref.read(reportProvider.notifier).deleteReport(id); },
            child: const Text('删除', style: TextStyle(color: AppColors.error)),
          ),
        ],
      ),
    );
  }

  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';
  }
}

String _catTitle(String c) => switch (c) {
  'BloodTest' => '抽血化验单',
  'Biochemistry' => '生化检验报告',
  'Ecg' => '心电图报告',
  'Ultrasound' => '超声检查报告',
  'Discharge' => '出院小结',
  'Image' => '影像检查报告',
  _ => '检查报告',
};