// 首页 — 日记流 + 心情概览

import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:go_router/go_router.dart';
import 'package:nuanji_app/core/theme/app_colors.dart';
import 'package:nuanji_app/data/models/journal_entry.dart';
import 'package:nuanji_app/data/repositories/journal_repository.dart';
import '../bloc/home_bloc.dart';

/// 首页 — 展示最近日记流和心情概览
class HomePage extends StatelessWidget {
  const HomePage({super.key});

  @override
  Widget build(BuildContext context) {
    return BlocProvider(
      create: (context) => HomeBloc(
        journalRepository: context.read<JournalRepository>(),
      )..add(const HomeLoadData()),
      child: const _HomeView(),
    );
  }
}

class _HomeView extends StatelessWidget {
  const _HomeView();

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final colorScheme = theme.colorScheme;

    return BlocBuilder<HomeBloc, HomeState>(
      builder: (context, state) {
        return Scaffold(
          appBar: AppBar(
            title: Text(
              '暖记',
              style: theme.textTheme.headlineSmall?.copyWith(
                fontFamily: 'Caveat',
                color: colorScheme.primary,
              ),
            ),
            actions: [
              IconButton(
                onPressed: () => context.go('/stickers'),
                icon: const Icon(Icons.emoji_emotions_outlined),
                tooltip: '贴纸库',
              ),
              IconButton(
                onPressed: () => context.go('/templates'),
                icon: const Icon(Icons.dashboard_customize_outlined),
                tooltip: '模板',
              ),
            ],
          ),
          body: state is HomeLoading
              ? const Center(child: CircularProgressIndicator())
              : state is HomeLoaded
                  ? _buildContent(context, state)
                  : _buildContent(context, const HomeLoaded()),
        );
      },
    );
  }

  Widget _buildContent(BuildContext context, HomeLoaded state) {
    return RefreshIndicator(
      onRefresh: () async {
        context.read<HomeBloc>().add(const HomeRefresh());
      },
      child: SingleChildScrollView(
        physics: const AlwaysScrollableScrollPhysics(),
        padding: const EdgeInsets.all(16),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            // 心情快速选择卡片
            _QuickMoodCard(
              hasTodayEntry: state.hasTodayEntry,
              topMood: state.topMood,
              streakDays: state.streakDays,
            ),
            const SizedBox(height: 20),

            // 最近日记
            Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: [
                Text(
                  '最近日记',
                  style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold),
                ),
                TextButton(
                  onPressed: () => context.go('/calendar'),
                  child: const Text('查看全部'),
                ),
              ],
            ),
            const SizedBox(height: 12),

            state.recentJournals.isEmpty
                ? const _EmptyJournalState()
                : _JournalList(journals: state.recentJournals),
          ],
        ),
      ),
    );
  }
}

/// 心情快速选择卡片
class _QuickMoodCard extends StatelessWidget {
  const _QuickMoodCard({
    required this.hasTodayEntry,
    this.topMood,
    this.streakDays = 0,
  });

  final bool hasTodayEntry;
  final Mood? topMood;
  final int streakDays;

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final colorScheme = theme.colorScheme;
    final moods = [
      ('😊', '开心', Mood.happy),
      ('😌', '平静', Mood.calm),
      ('😢', '难过', Mood.sad),
      ('😠', '生气', Mood.angry),
      ('🤔', '思考', Mood.thinking),
    ];

    return Card(
      elevation: 0,
      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(22)),
      color: colorScheme.primaryContainer.withValues(alpha: 0.3),
      child: Padding(
        padding: const EdgeInsets.all(20),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Row(
              children: [
                Text('今天心情如何？', style: theme.textTheme.titleSmall?.copyWith(fontWeight: FontWeight.w600)),
                const Spacer(),
                if (streakDays > 0)
                  Container(
                    padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 2),
                    decoration: BoxDecoration(
                      color: AppColors.tertiary.withValues(alpha: 0.2),
                      borderRadius: BorderRadius.circular(8),
                    ),
                    child: Text('🔥 连续 $streakDays 天', style: theme.textTheme.labelSmall),
                  ),
                if (hasTodayEntry)
                  Container(
                    padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 2),
                    decoration: BoxDecoration(
                      color: AppColors.secondary.withValues(alpha: 0.2),
                      borderRadius: BorderRadius.circular(8),
                    ),
                    child: Text('✅ 今日已写', style: theme.textTheme.labelSmall),
                  ),
              ],
            ),
            const SizedBox(height: 16),
            Row(
              mainAxisAlignment: MainAxisAlignment.spaceAround,
              children: moods.map((mood) {
                final isTop = topMood == mood.$3;
                return GestureDetector(
                  onTap: () => context.push('/editor'),
                  child: Column(
                    children: [
                      Container(
                        width: 44,
                        height: 44,
                        decoration: BoxDecoration(
                          shape: BoxShape.circle,
                          color: (AppColors.moodColors[mood.$3.value] ?? colorScheme.primary)
                              .withValues(alpha: isTop ? 0.3 : 0.15),
                          border: isTop ? Border.all(color: AppColors.accent, width: 2) : null,
                        ),
                        alignment: Alignment.center,
                        child: Text(mood.$1, style: const TextStyle(fontSize: 22)),
                      ),
                      const SizedBox(height: 4),
                      Text(mood.$2, style: theme.textTheme.labelSmall?.copyWith(
                        color: colorScheme.onSurface.withValues(alpha: 0.6),
                      )),
                    ],
                  ),
                );
              }).toList(),
            ),
          ],
        ),
      ),
    );
  }
}

/// 日记列表
class _JournalList extends StatelessWidget {
  const _JournalList({required this.journals});
  final List<JournalEntry> journals;

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final colorScheme = theme.colorScheme;

    return Column(
      children: journals.map((journal) {
        final moodColor = AppColors.moodColors[journal.mood.value] ?? colorScheme.primary;
        return Card(
          margin: const EdgeInsets.only(bottom: 12),
          elevation: 0,
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(16),
            side: BorderSide(color: colorScheme.outlineVariant),
          ),
          child: InkWell(
            onTap: () => context.push('/editor?id=${journal.id}'),
            borderRadius: BorderRadius.circular(16),
            child: Padding(
              padding: const EdgeInsets.all(16),
              child: Row(
                children: [
                  Container(
                    width: 40,
                    height: 40,
                    decoration: BoxDecoration(
                      color: moodColor.withValues(alpha: 0.2),
                      shape: BoxShape.circle,
                    ),
                    alignment: Alignment.center,
                    child: Text(_moodEmoji(journal.mood), style: const TextStyle(fontSize: 20)),
                  ),
                  const SizedBox(width: 12),
                  Expanded(
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        Text(journal.title, style: theme.textTheme.titleSmall?.copyWith(fontWeight: FontWeight.w600),
                          maxLines: 1, overflow: TextOverflow.ellipsis),
                        const SizedBox(height: 4),
                        Text('${journal.date.month}月${journal.date.day}日',
                          style: theme.textTheme.bodySmall?.copyWith(
                            color: colorScheme.onSurface.withValues(alpha: 0.5)),
                        ),
                      ],
                    ),
                  ),
                  Icon(Icons.chevron_right, color: colorScheme.onSurface.withValues(alpha: 0.3)),
                ],
              ),
            ),
          ),
        );
      }).toList(),
    );
  }

  String _moodEmoji(Mood mood) => switch (mood) {
        Mood.happy => '😊', Mood.calm => '😌', Mood.sad => '😢',
        Mood.angry => '😠', Mood.thinking => '🤔',
      };
}

/// 空日记状态
class _EmptyJournalState extends StatelessWidget {
  const _EmptyJournalState();

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final colorScheme = theme.colorScheme;

    return Center(
      child: Padding(
        padding: const EdgeInsets.symmetric(vertical: 48),
        child: Column(
          children: [
            Icon(Icons.edit_note_rounded, size: 64, color: colorScheme.onSurface.withValues(alpha: 0.2)),
            const SizedBox(height: 16),
            Text('开始你的第一篇手账日记吧！',
              style: theme.textTheme.bodyLarge?.copyWith(color: colorScheme.onSurface.withValues(alpha: 0.5))),
            const SizedBox(height: 24),
            FilledButton.icon(
              onPressed: () => context.push('/editor'),
              icon: const Icon(Icons.add_rounded),
              label: const Text('写日记'),
            ),
          ],
        ),
      ),
    );
  }
}