import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:habo/habits/habits_manager.dart';
import 'package:habo/navigation/app_state_manager.dart';
import 'package:habo/constants.dart';

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

  @override
  State<CreateHabitScreen> createState() => _CreateHabitScreenState();
}

class _CreateHabitScreenState extends State<CreateHabitScreen> {
  final _titleController = TextEditingController();
  final _cueController = TextEditingController();
  final _routineController = TextEditingController();
  final _rewardController = TextEditingController();
  final _sanctionController = TextEditingController();
  final _accountantController = TextEditingController();
  final _targetValueController = TextEditingController(text: '100');
  final _partialValueController = TextEditingController(text: '10');
  final _unitController = TextEditingController();

  bool _twoDayRule = false;
  bool _notification = false;
  bool _advanced = false;
  bool _habitContract = false;
  bool _showReward = false;
  bool _showSanction = false;
  HabitType _habitType = HabitType.boolean;
  TimeOfDay _notTime = const TimeOfDay(hour: 20, minute: 0);

  @override
  void dispose() {
    _titleController.dispose();
    _cueController.dispose();
    _routineController.dispose();
    _rewardController.dispose();
    _sanctionController.dispose();
    _accountantController.dispose();
    _targetValueController.dispose();
    _partialValueController.dispose();
    _unitController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Create Habit'),
        leading: IconButton(
          icon: const Icon(Icons.arrow_back),
          onPressed: () => context.read<AppStateManager>().goCreateHabit(false),
        ),
        actions: [
          IconButton(
            icon: const Icon(Icons.check, color: HaboColors.primary),
            onPressed: _save,
          ),
        ],
      ),
      body: ListView(
        padding: const EdgeInsets.all(16),
        children: [
          // Title
          TextField(
            controller: _titleController,
            autofocus: true,
            decoration: const InputDecoration(
              labelText: 'Title *',
              hintText: 'e.g. Exercise, Reading, Meditation',
              prefixIcon: Icon(Icons.title),
              border: OutlineInputBorder(),
            ),
          ),
          const SizedBox(height: 16),

          // Habit Type
          Card(
            child: Padding(
              padding: const EdgeInsets.all(16),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text(
                    'Habit Type',
                    style: Theme.of(context).textTheme.titleSmall?.copyWith(
                          fontWeight: FontWeight.bold,
                        ),
                  ),
                  const SizedBox(height: 8),
                  RadioListTile<HabitType>(
                    title: const Text('Checkable (Yes/No)'),
                    subtitle: const Text('Simple daily check-in'),
                    secondary: const Icon(Icons.check_box),
                    value: HabitType.boolean,
                    groupValue: _habitType,
                    onChanged: (v) => setState(() => _habitType = v!),
                  ),
                  RadioListTile<HabitType>(
                    title: const Text('Progressive (Numeric)'),
                    subtitle: const Text('Track counts like steps, glasses'),
                    secondary: const Icon(Icons.track_changes),
                    value: HabitType.numeric,
                    groupValue: _habitType,
                    onChanged: (v) => setState(() => _habitType = v!),
                  ),
                ],
              ),
            ),
          ),

          // Numeric fields
          if (_habitType == HabitType.numeric)
            Card(
              child: Padding(
                padding: const EdgeInsets.all(16),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Text(
                      'Progress Settings',
                      style: Theme.of(context).textTheme.titleSmall?.copyWith(
                            fontWeight: FontWeight.bold,
                          ),
                    ),
                    const SizedBox(height: 12),
                    TextField(
                      controller: _targetValueController,
                      keyboardType: const TextInputType.numberWithOptions(decimal: true),
                      decoration: const InputDecoration(
                        labelText: 'Target Value',
                        prefixIcon: Icon(Icons.flag),
                        border: OutlineInputBorder(),
                      ),
                    ),
                    const SizedBox(height: 12),
                    TextField(
                      controller: _partialValueController,
                      keyboardType: const TextInputType.numberWithOptions(decimal: true),
                      decoration: const InputDecoration(
                        labelText: 'Partial Value (increment)',
                        prefixIcon: Icon(Icons.add),
                        border: OutlineInputBorder(),
                      ),
                    ),
                    const SizedBox(height: 12),
                    TextField(
                      controller: _unitController,
                      decoration: const InputDecoration(
                        labelText: 'Unit',
                        hintText: 'e.g. steps, km, glasses',
                        prefixIcon: Icon(Icons.straighten),
                        border: OutlineInputBorder(),
                      ),
                    ),
                  ],
                ),
              ),
            ),

          // Two Day Rule
          Card(
            child: SwitchListTile(
              title: const Text('Two Day Rule'),
              subtitle: const Text('Allow one miss without losing streak'),
              secondary: const Icon(Icons.rule),
              value: _twoDayRule,
              onChanged: (v) => setState(() => _twoDayRule = v),
            ),
          ),

          // Notifications
          Card(
            child: Column(
              children: [
                SwitchListTile(
                  title: const Text('Daily Reminder'),
                  subtitle: const Text('Get notified to check habits'),
                  secondary: const Icon(Icons.notifications),
                  value: _notification,
                  onChanged: (v) => setState(() => _notification = v),
                ),
                if (_notification)
                  Padding(
                    padding: const EdgeInsets.fromLTRB(16, 0, 16, 16),
                    child: OutlinedButton.icon(
                      onPressed: _pickTime,
                      icon: const Icon(Icons.access_time),
                      label: Text('${_notTime.format(context)}'),
                    ),
                  ),
              ],
            ),
          ),

          // Advanced Options
          ExpansionTile(
            leading: const Icon(Icons.tune),
            title: const Text('Advanced Options'),
            subtitle: const Text('Cue, Routine, Reward, Habit Contract'),
            children: [
              Padding(
                padding: const EdgeInsets.all(16),
                child: Column(
                  children: [
                    TextField(
                      controller: _cueController,
                      decoration: const InputDecoration(
                        labelText: 'Cue (Trigger)',
                        hintText: 'e.g. At 7:00 AM',
                        prefixIcon: Icon(Icons.flash_on),
                        border: OutlineInputBorder(),
                      ),
                    ),
                    const SizedBox(height: 12),
                    TextField(
                      controller: _routineController,
                      decoration: const InputDecoration(
                        labelText: 'Routine (Action)',
                        hintText: 'e.g. Do 50 push ups',
                        prefixIcon: Icon(Icons.fitness_center),
                        border: OutlineInputBorder(),
                      ),
                    ),
                    const SizedBox(height: 12),
                    Row(
                      children: [
                        Expanded(
                          child: TextField(
                            controller: _rewardController,
                            decoration: const InputDecoration(
                              labelText: 'Reward',
                              hintText: 'e.g. 15 min games',
                              prefixIcon: Icon(Icons.emoji_events),
                              border: OutlineInputBorder(),
                            ),
                          ),
                        ),
                        const SizedBox(width: 12),
                        Switch(value: _showReward, onChanged: (v) => setState(() => _showReward = v)),
                      ],
                    ),
                  ],
                ),
              ),
              const Divider(),
              SwitchListTile(
                title: const Text('Habit Contract'),
                subtitle: const Text('Set a sanction for missing'),
                secondary: const Icon(Icons.gavel),
                value: _habitContract,
                onChanged: (v) => setState(() => _habitContract = v),
              ),
              if (_habitContract)
                Padding(
                  padding: const EdgeInsets.all(16),
                  child: Column(
                    children: [
                      TextField(
                        controller: _sanctionController,
                        decoration: const InputDecoration(
                          labelText: 'Sanction',
                          hintText: 'e.g. Donate \$10 to charity',
                          prefixIcon: Icon(Icons.warning),
                          border: OutlineInputBorder(),
                        ),
                      ),
                      const SizedBox(height: 12),
                      TextField(
                        controller: _accountantController,
                        decoration: const InputDecoration(
                          labelText: 'Accountability Partner',
                          hintText: 'e.g. Dan',
                          prefixIcon: Icon(Icons.person),
                          border: OutlineInputBorder(),
                        ),
                      ),
                    ],
                  ),
                ),
            ],
          ),
          const SizedBox(height: 24),

          // Save button
          SizedBox(
            width: double.infinity,
            height: 48,
            child: ElevatedButton.icon(
              onPressed: _save,
              icon: const Icon(Icons.check),
              label: const Text('Save Habit', style: TextStyle(fontSize: 16)),
              style: ElevatedButton.styleFrom(
                backgroundColor: HaboColors.primary,
                foregroundColor: Colors.white,
                shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
              ),
            ),
          ),
          const SizedBox(height: 24),
        ],
      ),
    );
  }

  Future<void> _pickTime() async {
    final picked = await showTimePicker(context: context, initialTime: _notTime);
    if (picked != null) setState(() => _notTime = picked);
  }

  void _save() {
    if (_titleController.text.trim().isEmpty) {
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Title cannot be empty!'), backgroundColor: HaboColors.red),
      );
      return;
    }

    context.read<HabitsManager>().addHabit(
          _titleController.text.trim(),
          _twoDayRule,
          _cueController.text,
          _routineController.text,
          _rewardController.text,
          _showReward,
          _advanced || _habitContract,
          _notification,
          _notTime,
          _sanctionController.text,
          _showSanction,
          _accountantController.text,
          habitType: _habitType,
          targetValue: double.tryParse(_targetValueController.text) ?? 100.0,
          partialValue: double.tryParse(_partialValueController.text) ?? 10.0,
          unit: _unitController.text,
        );

    context.read<AppStateManager>().goCreateHabit(false);
  }
}