// 搜索页面 — 日记搜索 + 标签筛选

import 'package:flutter/material.dart';
import 'package:nuanji_app/core/theme/app_colors.dart';
import 'package:nuanji_app/data/models/journal_entry.dart';

/// 搜索页面 — 全文搜索日记（Phase 1 占位 UI）
class SearchPage extends StatefulWidget {
  const SearchPage({super.key});

  @override
  State<SearchPage> createState() => _SearchPageState();
}

class _SearchPageState extends State<SearchPage> {
  final _searchController = TextEditingController();
  bool _hasSearched = false;

  // Phase 1 占位数据
  final _recentTags = ['日常', '学校', '旅行', '美食', '读书', '心情'];
  final _moodFilters = Mood.values;

  @override
  void dispose() {
    _searchController.dispose();
    super.dispose();
  }

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

    return Scaffold(
      appBar: AppBar(
        title: TextField(
          controller: _searchController,
          decoration: InputDecoration(
            hintText: '搜索日记...',
            hintStyle: theme.textTheme.bodyLarge?.copyWith(
              color: colorScheme.onSurface.withValues(alpha: 0.4),
            ),
            border: InputBorder.none,
            prefixIcon: const Icon(Icons.search),
            suffixIcon: _searchController.text.isNotEmpty
                ? IconButton(
                    icon: const Icon(Icons.clear),
                    onPressed: () {
                      _searchController.clear();
                      setState(() => _hasSearched = false);
                    },
                  )
                : null,
          ),
          textInputAction: TextInputAction.search,
          onSubmitted: (_) => _doSearch(),
        ),
      ),
      body: _hasSearched
          ? _buildSearchResults(context, colorScheme)
          : _buildSuggestions(context, theme, colorScheme),
    );
  }

  void _doSearch() {
    setState(() => _hasSearched = true);
  }

  Widget _buildSuggestions(BuildContext context, ThemeData theme, ColorScheme colorScheme) {
    return SingleChildScrollView(
      padding: const EdgeInsets.all(16),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text('常用标签', style: theme.textTheme.titleSmall?.copyWith(fontWeight: FontWeight.w600)),
          const SizedBox(height: 8),
          Wrap(
            spacing: 8,
            runSpacing: 8,
            children: _recentTags.map((tag) {
              return ActionChip(
                label: Text(tag),
                onPressed: () {
                  _searchController.text = tag;
                  _doSearch();
                },
              );
            }).toList(),
          ),
          const SizedBox(height: 24),
          Text('按心情筛选', style: theme.textTheme.titleSmall?.copyWith(fontWeight: FontWeight.w600)),
          const SizedBox(height: 12),
          Wrap(
            spacing: 12,
            runSpacing: 12,
            children: _moodFilters.map((mood) {
              final color = AppColors.moodColors[mood.value] ?? colorScheme.primary;
              return GestureDetector(
                onTap: () {
                  _searchController.text = _moodLabel(mood);
                  _doSearch();
                },
                child: Column(
                  children: [
                    Container(
                      width: 48,
                      height: 48,
                      decoration: BoxDecoration(
                        shape: BoxShape.circle,
                        color: color.withValues(alpha: 0.15),
                      ),
                      alignment: Alignment.center,
                      child: Text(_moodEmoji(mood), style: const TextStyle(fontSize: 24)),
                    ),
                    const SizedBox(height: 4),
                    Text(_moodLabel(mood), style: theme.textTheme.labelSmall),
                  ],
                ),
              );
            }).toList(),
          ),
        ],
      ),
    );
  }

  Widget _buildSearchResults(BuildContext context, ColorScheme colorScheme) {
    return Center(
      child: Column(
        mainAxisSize: MainAxisSize.min,
        children: [
          Icon(Icons.search_off_rounded, size: 48, color: colorScheme.onSurface.withValues(alpha: 0.2)),
          const SizedBox(height: 12),
          Text(
            'Phase 1: 搜索功能待 Isar FTS 集成',
            style: Theme.of(context).textTheme.bodyMedium?.copyWith(
              color: colorScheme.onSurface.withValues(alpha: 0.5),
            ),
          ),
        ],
      ),
    );
  }

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

  String _moodLabel(Mood mood) => switch (mood) {
        Mood.happy => '开心',
        Mood.calm => '平静',
        Mood.sad => '难过',
        Mood.angry => '生气',
        Mood.thinking => '思考',
      };
}