import 'package:flutter/material.dart';
import 'package:go_router/go_router.dart';
import 'package:social_app/core/di/injection.dart';
import 'package:social_app/core/theme/design_tokens.dart';
import 'package:social_app/core/router/app_routes.dart';
import 'package:social_app/shared/widgets/app_loading_indicator.dart';
import 'package:social_app/shared/widgets/app_pressable.dart';
import '../widgets/settings_page_scaffold.dart';
import '../../data/models/memory_models.dart';
import '../../data/services/memory_service.dart';

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

  @override
  State<MemoryScreen> createState() => _MemoryScreenState();
}

class _MemoryScreenState extends State<MemoryScreen> {
  final MemoryService _memoryService = sl<MemoryService>();
  MemoryListResponse? _memoryData;
  bool _isLoading = true;
  String? _error;

  @override
  void initState() {
    super.initState();
    _loadMemories();
  }

  Future<void> _loadMemories() async {
    if (!mounted) return;
    setState(() {
      _isLoading = true;
      _error = null;
    });

    try {
      final data = await _memoryService.getAllMemories();
      if (!mounted) return;
      setState(() {
        _memoryData = data;
        _isLoading = false;
      });
    } catch (e) {
      if (!mounted) return;
      setState(() {
        _error = '加载失败，请重试';
        _isLoading = false;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return SettingsPageScaffold(
      title: '我的记忆',
      onBack: () => context.pop(),
      body: Column(
        crossAxisAlignment: CrossAxisAlignment.stretch,
        children: [
          _buildToggleCard(),
          const SizedBox(height: AppSpacing.lg),
          if (_isLoading) ...[
            const SizedBox(height: AppSpacing.xxl),
            _buildLoadingState(),
          ] else if (_error != null) ...[
            const SizedBox(height: AppSpacing.xxl),
            _buildErrorState(),
          ] else ...[
            const SizedBox(height: AppSpacing.sm),
            _buildMemoryCards(),
          ],
        ],
      ),
    );
  }

  Widget _buildToggleCard() {
    return Container(
      padding: const EdgeInsets.all(AppSpacing.lg),
      decoration: BoxDecoration(
        gradient: const LinearGradient(
          begin: Alignment.topLeft,
          end: Alignment.bottomRight,
          colors: [AppColors.white, AppColors.surfaceInfoLight],
        ),
        borderRadius: BorderRadius.circular(AppRadius.xl),
        border: Border.all(color: AppColors.borderTertiary),
        boxShadow: [
          BoxShadow(
            color: AppColors.blue100.withValues(alpha: 0.35),
            blurRadius: 14,
            offset: const Offset(0, 4),
          ),
        ],
      ),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.center,
        children: [
          Container(
            width: 44,
            height: 44,
            decoration: BoxDecoration(
              gradient: const LinearGradient(
                begin: Alignment.topLeft,
                end: Alignment.bottomRight,
                colors: [AppColors.blue100, AppColors.blue50],
              ),
              borderRadius: BorderRadius.circular(12),
              boxShadow: [
                BoxShadow(
                  color: AppColors.blue200.withValues(alpha: 0.45),
                  blurRadius: 8,
                  offset: const Offset(0, 2),
                ),
              ],
            ),
            child: const Icon(
              Icons.auto_awesome,
              size: 22,
              color: AppColors.blue600,
            ),
          ),
          const SizedBox(width: AppSpacing.md),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                const Text(
                  '智能记忆',
                  style: TextStyle(
                    fontSize: 16,
                    fontWeight: FontWeight.w600,
                    color: AppColors.slate900,
                  ),
                ),
                const SizedBox(height: 2),
                Text(
                  '持续学习你的偏好和习惯',
                  style: TextStyle(
                    fontSize: 13,
                    fontWeight: FontWeight.w500,
                    color: AppColors.slate500,
                  ),
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildLoadingState() {
    return Center(
      child: Container(
        padding: const EdgeInsets.all(AppSpacing.xxl),
        child: const AppLoadingIndicator(size: 32),
      ),
    );
  }

  Widget _buildErrorState() {
    return Center(
      child: Column(
        mainAxisSize: MainAxisSize.min,
        children: [
          Icon(Icons.error_outline, size: 48, color: AppColors.slate300),
          const SizedBox(height: AppSpacing.md),
          Text(
            _error ?? '加载失败',
            style: TextStyle(fontSize: 14, color: AppColors.slate500),
          ),
          const SizedBox(height: AppSpacing.lg),
          AppPressable(
            onTap: _loadMemories,
            borderRadius: BorderRadius.circular(AppRadius.md),
            child: Container(
              padding: const EdgeInsets.symmetric(
                horizontal: AppSpacing.lg,
                vertical: AppSpacing.sm,
              ),
              decoration: BoxDecoration(
                color: AppColors.blue50,
                borderRadius: BorderRadius.circular(AppRadius.md),
                border: Border.all(color: AppColors.blue100),
              ),
              child: const Text(
                '重新加载',
                style: TextStyle(
                  fontSize: 14,
                  fontWeight: FontWeight.w500,
                  color: AppColors.blue600,
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildMemoryCards() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.stretch,
      children: [
        _buildSectionLabel('用户记忆'),
        const SizedBox(height: AppSpacing.sm),
        _buildUserMemoryCard(),
        const SizedBox(height: AppSpacing.md),
        _buildSectionLabel('工作记忆'),
        const SizedBox(height: AppSpacing.sm),
        _buildWorkMemoryCard(),
      ],
    );
  }

  Widget _buildSectionLabel(String label) {
    return Padding(
      padding: const EdgeInsets.symmetric(horizontal: AppSpacing.xs),
      child: Text(
        label,
        style: const TextStyle(
          fontSize: 12,
          fontWeight: FontWeight.w600,
          color: AppColors.slate500,
        ),
      ),
    );
  }

  Widget _buildUserMemoryCard() {
    final userMemory = _memoryData?.userMemory;
    final hasData = userMemory != null;

    return AppPressable(
      onTap: () => context.push(AppRoutes.settingsMemoryUser),
      borderRadius: BorderRadius.circular(AppRadius.xl),
      child: Container(
        padding: const EdgeInsets.all(AppSpacing.lg),
        decoration: BoxDecoration(
          gradient: const LinearGradient(
            begin: Alignment.topLeft,
            end: Alignment.bottomRight,
            colors: [AppColors.white, AppColors.surfaceInfoLight],
          ),
          borderRadius: BorderRadius.circular(AppRadius.xl),
          border: Border.all(color: AppColors.borderTertiary),
          boxShadow: [
            BoxShadow(
              color: AppColors.slate200.withValues(alpha: 0.45),
              blurRadius: 8,
              offset: const Offset(0, 2),
            ),
          ],
        ),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Row(
              children: [
                Container(
                  width: 40,
                  height: 40,
                  decoration: BoxDecoration(
                    gradient: LinearGradient(
                      begin: Alignment.topLeft,
                      end: Alignment.bottomRight,
                      colors: [
                        AppColors.blue100.withValues(alpha: 0.8),
                        AppColors.blue50.withValues(alpha: 0.8),
                      ],
                    ),
                    borderRadius: BorderRadius.circular(10),
                  ),
                  child: const Icon(
                    Icons.person,
                    size: 20,
                    color: AppColors.blue600,
                  ),
                ),
                const SizedBox(width: AppSpacing.md),
                Expanded(
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      const Text(
                        '个人偏好',
                        style: TextStyle(
                          fontSize: 16,
                          fontWeight: FontWeight.w600,
                          color: AppColors.slate900,
                        ),
                      ),
                      const SizedBox(height: 2),
                      Text(
                        hasData ? userMemory.summary : '暂无信息',
                        style: TextStyle(
                          fontSize: 13,
                          fontWeight: FontWeight.w500,
                          color: AppColors.slate500,
                        ),
                        maxLines: 1,
                        overflow: TextOverflow.ellipsis,
                      ),
                    ],
                  ),
                ),
                Icon(Icons.chevron_right, size: 20, color: AppColors.slate400),
              ],
            ),
            if (hasData) ...[
              const SizedBox(height: AppSpacing.md),
              _buildMemoryStatsRow(
                icons: [
                  Icons.people_outline,
                  Icons.place_outlined,
                  Icons.interests_outlined,
                  Icons.schedule_outlined,
                ],
                values: [
                  '${userMemory.people.length}',
                  '${userMemory.places.length}',
                  '${userMemory.interests.length}',
                  '${userMemory.recurringRoutines.length}',
                ],
                labels: ['联系人', '地点', '兴趣', '日程'],
              ),
            ],
          ],
        ),
      ),
    );
  }

  Widget _buildWorkMemoryCard() {
    final workMemory = _memoryData?.workMemory;
    final hasData = workMemory != null;

    return AppPressable(
      onTap: () => context.push(AppRoutes.settingsMemoryWork),
      borderRadius: BorderRadius.circular(AppRadius.xl),
      child: Container(
        padding: const EdgeInsets.all(AppSpacing.lg),
        decoration: BoxDecoration(
          gradient: const LinearGradient(
            begin: Alignment.topLeft,
            end: Alignment.bottomRight,
            colors: [AppColors.white, AppColors.surfaceTertiary],
          ),
          borderRadius: BorderRadius.circular(AppRadius.xl),
          border: Border.all(color: AppColors.borderSecondary),
          boxShadow: [
            BoxShadow(
              color: AppColors.slate200.withValues(alpha: 0.4),
              blurRadius: 8,
              offset: const Offset(0, 2),
            ),
          ],
        ),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Row(
              children: [
                Container(
                  width: 40,
                  height: 40,
                  decoration: BoxDecoration(
                    gradient: LinearGradient(
                      begin: Alignment.topLeft,
                      end: Alignment.bottomRight,
                      colors: [
                        AppColors.violet500.withValues(alpha: 0.15),
                        AppColors.violet500.withValues(alpha: 0.05),
                      ],
                    ),
                    borderRadius: BorderRadius.circular(10),
                  ),
                  child: const Icon(
                    Icons.work_outline,
                    size: 20,
                    color: AppColors.violet600,
                  ),
                ),
                const SizedBox(width: AppSpacing.md),
                Expanded(
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      const Text(
                        '工作画像',
                        style: TextStyle(
                          fontSize: 16,
                          fontWeight: FontWeight.w600,
                          color: AppColors.slate900,
                        ),
                      ),
                      const SizedBox(height: 2),
                      Text(
                        hasData ? workMemory.summary : '暂无信息',
                        style: TextStyle(
                          fontSize: 13,
                          fontWeight: FontWeight.w500,
                          color: AppColors.slate500,
                        ),
                        maxLines: 1,
                        overflow: TextOverflow.ellipsis,
                      ),
                    ],
                  ),
                ),
                Icon(Icons.chevron_right, size: 20, color: AppColors.slate400),
              ],
            ),
            if (hasData) ...[
              const SizedBox(height: AppSpacing.md),
              _buildMemoryStatsRow(
                icons: [
                  Icons.psychology_outlined,
                  Icons.build_outlined,
                  Icons.folder_outlined,
                  Icons.groups_outlined,
                ],
                values: [
                  '${workMemory.expertise.length}',
                  '${workMemory.preferredTools.length}',
                  '${workMemory.currentProjects.length}',
                  '${workMemory.teamMembers.length}',
                ],
                labels: ['专长', '工具', '项目', '团队'],
              ),
            ],
          ],
        ),
      ),
    );
  }

  Widget _buildMemoryStatsRow({
    required List<IconData> icons,
    required List<String> values,
    required List<String> labels,
  }) {
    return Row(
      children: List.generate(icons.length, (index) {
        return Expanded(
          child: Container(
            padding: const EdgeInsets.symmetric(vertical: AppSpacing.sm),
            margin: EdgeInsets.only(
              right: index < icons.length - 1 ? AppSpacing.sm : 0,
            ),
            decoration: BoxDecoration(
              color: AppColors.surfaceSecondary,
              borderRadius: BorderRadius.circular(AppRadius.md),
            ),
            child: Column(
              children: [
                Icon(icons[index], size: 16, color: AppColors.slate400),
                const SizedBox(height: 4),
                Text(
                  values[index],
                  style: const TextStyle(
                    fontSize: 14,
                    fontWeight: FontWeight.w600,
                    color: AppColors.slate700,
                  ),
                ),
                const SizedBox(height: 2),
                Text(
                  labels[index],
                  style: TextStyle(
                    fontSize: 10,
                    fontWeight: FontWeight.w500,
                    color: AppColors.slate400,
                  ),
                ),
              ],
            ),
          ),
        );
      }),
    );
  }
}