import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;

/// Null means outside the current context; all parallel unfinished branches qualify.
String? hintReason(Map<String,dynamic> hint, Map<String,dynamic> room) {
  final phase = room['phase'];
  if (hint['phase'] != 'ALL' && hint['phase'] != phase) return null;
  final target = hint['target'];
  if (target == 'room') return hint['phase'] == 'ALL' ? 'General room hint' : 'Current phase: $phase';
  final isPuzzle = (target as String).startsWith('P');
  final items = (room[isPuzzle ? 'puzzles' : 'stations'] as List?) ?? [];
  final matches = items.where((p) => p['id'] == target);
  if (matches.isEmpty) return null;
  final item = matches.first;
  final complete = item[isPuzzle ? 'solved' : 'won'] == true;
  if (hint['condition'] == 'complete' && !complete) return null;
  if (hint['condition'] == 'incomplete') {
    if (complete || phase != 'ARCADE') return null;
    bool flag(String id, String field) => ((room['puzzles'] as List?) ?? []).any((p) => p['id'] == id && p[field] == true);
    if (target == 'P02A' && !flag('P01','solved')) return null;
    if (target == 'P02B' && !flag('P02A','delivered')) return null;
  }
  return '$target: ${complete ? 'completed' : 'unfinished'}';
}

class HintPanel extends StatefulWidget {
  const HintPanel({super.key, required this.room, required this.client, required this.base, required this.onSpeak, required this.canSpeak});
  final Map<String,dynamic> room;
  final http.Client client;
  final String base;
  final Future<void> Function(String text) onSpeak;
  final bool canSpeak;
  @override
  State<HintPanel> createState() => _HintPanelState();
}
class _HintPanelState extends State<HintPanel> {
  List<Map<String,dynamic>> hints = [];
  int revision = 0;
  bool loading = false, suggested = true;
  String category = 'All categories', query = '', message = '';
  final draft = TextEditingController();
  @override
  void initState() { super.initState(); load(); }
  @override
  void dispose() { draft.dispose(); super.dispose(); }
  Future<void> load() async {
    if (loading) return;
    setState(() => loading = true);
    try {
      final response = await widget.client.get(Uri.parse('${widget.base}/hints')).timeout(const Duration(seconds:5));
      final body = jsonDecode(response.body);
      if (response.statusCode != 200 || body['hints'] is! List) throw Exception('Hint library unavailable. Restart the updated lab gateway.');
      if (mounted) setState(() {
        hints = (body['hints'] as List).map((h)=>Map<String,dynamic>.from(h)).toList();
        revision = body['revision']; message = '';
      });
    } catch (e) { if (mounted) setState(()=>message=e.toString()); }
    finally { if (mounted) setState(()=>loading=false); }
  }
  Future<void> edit([Map<String,dynamic>? original, String? initialText]) async {
    final title = TextEditingController(text:original?['title'] ?? '');
    final text = TextEditingController(text:original?['text'] ?? initialText ?? '');
    final tags = TextEditingController(text:((original?['categories'] as List?) ?? ['General']).join(', '));
    var phase = original?['phase'] ?? 'ALL';
    var target = original?['target'] ?? 'room';
    var condition = original?['condition'] ?? 'any';
    var level = original?['level'] ?? 1;
    var error = '';
    var saving = false;
    var editRevision = revision;
    await showDialog<void>(context:context,builder:(context)=>StatefulBuilder(builder:(context,update) {
      Widget pick(String label, dynamic value, List<dynamic> values, void Function(dynamic) change) =>
        DropdownButtonFormField<dynamic>(initialValue:value,isExpanded:true,
          decoration:InputDecoration(labelText:label),
          items:values.map((v)=>DropdownMenuItem<dynamic>(value:v,child:Text('$v'))).toList(),
          onChanged:saving ? null : (v)=>update(()=>change(v)));
      return AlertDialog(
        title:Text(original == null ? 'Create saved hint' : 'Edit saved hint'),
        content:SizedBox(width:580,child:SingleChildScrollView(child:Column(mainAxisSize:MainAxisSize.min,children:[
          TextField(controller:title,maxLength:100,decoration:const InputDecoration(labelText:'Hint title')),
          TextField(controller:text,maxLength:1500,minLines:3,maxLines:6,decoration:const InputDecoration(labelText:'What Teddy should say')),
          TextField(controller:tags,decoration:const InputDecoration(labelText:'Categories, separated by commas')),
          pick('Room phase',phase,['ALL','BRIEFING','ARCADE','BOSS','REVEAL','CELLS','CALIBRATION_TUTORIAL','CALIBRATION','LAUNCH_ARM','COUNTDOWN','DEBRIEF'],(v)=>phase=v),
          pick('Puzzle or cabinet',target,['room','P01','P02A','P02B','P03','P04','P05','P06',...List.generate(6,(i)=>'cabinet_0${i+1}')],(v)=>target=v),
          pick('Show when target is',condition,['any','incomplete','complete'],(v)=>condition=v),
          pick('Hint strength: 1 subtle, 2 direct, 3 solution',level,[1,2,3],(v)=>level=v),
          if (error.isNotEmpty) Text(error,style:TextStyle(color:Theme.of(context).colorScheme.error)),
        ]))),
        actions:[
          TextButton(onPressed:saving?null:()=>Navigator.pop(context),child:const Text('Cancel')),
          FilledButton(onPressed:saving?null:() async {
            update(()=>saving=true);
            try {
              final result=await widget.client.post(Uri.parse('${widget.base}/hints'),
                headers:{'Content-Type':'application/json'},
                body:jsonEncode({'revision':editRevision,'hint':{
                  'id':original?['id'] ?? '', 'title':title.text,'text':text.text,
                  'categories':tags.text.split(',').map((s)=>s.trim()).where((s)=>s.isNotEmpty).toList(),
                  'phase':phase,'target':target,'condition':condition,'level':level,
                }})).timeout(const Duration(seconds:6));
              final body=jsonDecode(result.body);
              if (result.statusCode != 200) {
                if (result.statusCode == 409) {
                  await load(); editRevision=revision;
                  throw Exception('Library changed on another device. Your draft is kept. Review it, then Save again to apply your version.');
                }
                throw Exception(body['error'] ?? 'Save failed');
              }
              if (mounted) setState(() {
                hints=(body['hints'] as List).map((h)=>Map<String,dynamic>.from(h)).toList();
                revision=body['revision']; message='Hint saved on the host PC.';
              });
              if (context.mounted) Navigator.pop(context);
            } catch(e) { if(context.mounted) update(()=>error=e.toString()); }
            finally { if(context.mounted) update(()=>saving=false); }
          },child:Text(saving?'Saving...':'Save hint')),
        ],
      );
    }));
    // Controllers are released after the dialog route's closing animation.
    await Future<void>.delayed(const Duration(milliseconds:250));
    title.dispose(); text.dispose(); tags.dispose();
  }
  @override
  Widget build(BuildContext context) {
    final categories = {'All categories',...hints.expand((h)=>(h['categories'] as List).cast<String>())}.toList()..sort();
    final shown = hints.where((h) {
      if(suggested && hintReason(h,widget.room)==null) return false;
      if(category!='All categories' && !(h['categories'] as List).contains(category)) return false;
      return '${h['title']} ${h['text']} ${h['categories']}'.toLowerCase().contains(query.toLowerCase());
    }).toList()..sort((a,b)=>(a['level'] as int).compareTo(b['level'] as int));
    return Column(crossAxisAlignment:CrossAxisAlignment.start,children:[
      const SizedBox(height:24),
      Text('Hint library',style:Theme.of(context).textTheme.titleLarge),
      Text('Room phase: ${widget.room['phase']}. Suggestions include all eligible parallel puzzles. These are suggestions; the GM chooses what to say.'),
      Wrap(spacing:10,runSpacing:8,children:[
        FilterChip(label:const Text('Relevant now'),selected:suggested,onSelected:(v)=>setState(()=>suggested=v)),
        OutlinedButton(onPressed:()=>edit(),child:const Text('New saved hint')),
        TextButton(onPressed:loading?null:load,child:const Text('Reload library')),
      ]),
      DropdownButton<String>(isExpanded:true,value:categories.contains(category)?category:'All categories',
        items:categories.map((c)=>DropdownMenuItem(value:c,child:Text(c))).toList(),
        onChanged:(v)=>setState(()=>category=v!)),
      TextField(decoration:const InputDecoration(labelText:'Search hints'),onChanged:(v)=>setState(()=>query=v)),
      if(message.isNotEmpty) Text(message),
      if(loading) const LinearProgressIndicator(),
      if(!loading && shown.isEmpty) const Text('No matching hints. Turn off Relevant now to browse the whole library.'),
      ...shown.map((h)=>Card(child:Padding(padding:const EdgeInsets.all(12),child:Column(crossAxisAlignment:CrossAxisAlignment.start,children:[
        Text(h['title'],style:Theme.of(context).textTheme.titleMedium),
        Text('${(h['categories'] as List).join(' / ')} · Level ${h['level']} · ${hintReason(h,widget.room) ?? 'Outside current context'}'),
        Text(h['text']),
        Wrap(spacing:8,children:[
          FilledButton(onPressed:widget.canSpeak?()=>widget.onSpeak(h['text']):null,child:const Text('Say now')),
          TextButton(onPressed:()=>edit(h),child:const Text('Edit')),
        ]),
      ])))),
      const SizedBox(height:16),
      TextField(controller:draft,minLines:2,maxLines:5,maxLength:1500,
        decoration:const InputDecoration(labelText:'Write a one-off hint',hintText:'Type exactly what Teddy should say')),
      Wrap(spacing:8,children:[
        FilledButton(onPressed:widget.canSpeak?() {
          if(draft.text.trim().isNotEmpty) widget.onSpeak(draft.text.trim());
        }:null,child:const Text('Say typed hint now')),
        OutlinedButton(onPressed:()=>edit(null,draft.text),child:const Text('Save typed hint...')),
      ]),
    ]);
  }
}