import 'package:flutter/material.dart';

import '../../../../core/widgets/premium_text_field.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:lucide_icons_flutter/lucide_icons.dart';
import '../../domain/project_task.dart';
import '../../providers/project_provider.dart';
import '../../providers/user_provider.dart';
import '../../../../core/domain/user.dart';

class AddTaskSheet extends ConsumerStatefulWidget {
  final int projectId;
  final ProjectTask? task;

  const AddTaskSheet({super.key, required this.projectId, this.task});

  @override
  ConsumerState<AddTaskSheet> createState() => _AddTaskSheetState();
}

class _AddTaskSheetState extends ConsumerState<AddTaskSheet> {
  final _formKey = GlobalKey<FormState>();
  String _title = '';
  String _description = '';
  String _assigneeName = '';
  bool _isBillable = false;
  double _hourlyRate = 0;
  bool _isLoading = false;

  bool get _isEditing => widget.task != null;

  @override
  void initState() {
    super.initState();
    if (widget.task != null) {
      _title = widget.task!.title;
      _description = widget.task!.description ?? '';
      _assigneeName = widget.task!.assigneeName ?? '';
      _isBillable = widget.task!.isBillable;
      _hourlyRate = widget.task!.hourlyRate;
    }
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      padding: EdgeInsets.only(
        bottom: MediaQuery.of(context).viewInsets.bottom,
        left: 24,
        right: 24,
        top: 24,
      ),
      decoration: const BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.vertical(top: Radius.circular(24)),
      ),
      child: SafeArea(
        child: Form(
          key: _formKey,
          child: SingleChildScrollView(
            child: Column(
              mainAxisSize: MainAxisSize.min,
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children: [
                Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: [
                    Text(
                      _isEditing ? 'Edit Task' : 'New Task',
                      style: const TextStyle(
                        fontSize: 20,
                        fontWeight: FontWeight.bold,
                      ),
                    ),
                    IconButton(
                      icon: const Icon(LucideIcons.x),
                      onPressed: () => Navigator.pop(context),
                    ),
                  ],
                ),
                const SizedBox(height: 16),
                PremiumTextField(
                  labelText: 'Task Title',
                  initialValue: _isEditing ? _title : null,
                  prefixIcon: const Icon(LucideIcons.checkSquare),
                  validator: (val) =>
                      val == null || val.isEmpty ? 'Required' : null,
                  onSaved: (val) => _title = val!,
                ),
                const SizedBox(height: 16),
                PremiumTextField(
                  maxLines: 3,
                  labelText: 'Description (Optional)',
                  initialValue: _isEditing ? _description : null,
                  prefixIcon: const Icon(LucideIcons.alignLeft),
                  onSaved: (val) => _description = val ?? '',
                ),
                const SizedBox(height: 16),
                Autocomplete<User>(
                  initialValue: _isEditing && _assigneeName.isNotEmpty
                      ? TextEditingValue(text: _assigneeName)
                      : null,
                  optionsBuilder: (TextEditingValue textEditingValue) async {
                    if (textEditingValue.text.isEmpty) {
                      return const Iterable<User>.empty();
                    }
                    try {
                      return await ref.read(
                        userSearchProvider(textEditingValue.text).future,
                      );
                    } catch (e) {
                      return const Iterable<User>.empty();
                    }
                  },
                  displayStringForOption: (User option) =>
                      '${option.name} (${option.email})',
                  onSelected: (User selection) {
                    _assigneeName = selection.name;
                  },
                  optionsViewBuilder: (context, onSelected, options) {
                    return Align(
                      alignment: Alignment.topLeft,
                      child: Material(
                        elevation: 4,
                        borderRadius: BorderRadius.circular(12),
                        color: Colors.white,
                        child: ConstrainedBox(
                          constraints: const BoxConstraints(
                            maxHeight: 200,
                            maxWidth: 300,
                          ),
                          child: ListView.builder(
                            padding: EdgeInsets.zero,
                            shrinkWrap: true,
                            itemCount: options.length,
                            itemBuilder: (BuildContext context, int index) {
                              final User option = options.elementAt(index);
                              return ListTile(
                                title: Text(
                                  option.name,
                                  style: const TextStyle(
                                    fontWeight: FontWeight.bold,
                                  ),
                                ),
                                subtitle: Text(
                                  option.email,
                                  style: const TextStyle(color: Colors.grey),
                                ),
                                onTap: () => onSelected(option),
                              );
                            },
                          ),
                        ),
                      ),
                    );
                  },
                  fieldViewBuilder:
                      (
                        context,
                        textEditingController,
                        focusNode,
                        onFieldSubmitted,
                      ) {
                        return PremiumTextField(
                          controller: textEditingController,
                          focusNode: focusNode,
                          labelText: 'Assignee Name (Optional)',
                          prefixIcon: const Icon(LucideIcons.user),
                          onSaved: (val) {
                            if (_assigneeName.isEmpty)
                              _assigneeName = val ?? '';
                          },
                        );
                      },
                ),
                const SizedBox(height: 16),
                SwitchListTile(
                  title: const Text('Is Billable?'),
                  subtitle: const Text('Task time will be invoiced'),
                  value: _isBillable,
                  onChanged: (val) {
                    setState(() {
                      _isBillable = val;
                    });
                  },
                ),
                if (_isBillable) ...[
                  const SizedBox(height: 16),
                  PremiumTextField(
                    keyboardType: const TextInputType.numberWithOptions(
                      decimal: true,
                    ),
                    labelText: 'Hourly Rate',
                    initialValue: _isEditing && _hourlyRate > 0
                        ? _hourlyRate.toString()
                        : null,
                    prefixIcon: const Icon(LucideIcons.indianRupee),
                    validator: (val) =>
                        _isBillable && (val == null || val.isEmpty)
                        ? 'Required for billable tasks'
                        : null,
                    onSaved: (val) =>
                        _hourlyRate = double.tryParse(val ?? '0') ?? 0,
                  ),
                ],
                const SizedBox(height: 24),
                ElevatedButton(
                  style: ElevatedButton.styleFrom(
                    padding: const EdgeInsets.symmetric(vertical: 16),
                    shape: RoundedRectangleBorder(
                      borderRadius: BorderRadius.circular(12),
                    ),
                  ),
                  onPressed: _isLoading ? null : _submit,
                  child: _isLoading
                      ? const SizedBox(
                          width: 20,
                          height: 20,
                          child: CircularProgressIndicator(
                            color: Colors.white,
                            strokeWidth: 2,
                          ),
                        )
                      : Text(
                          _isEditing ? 'Save Changes' : 'Create Task',
                          style: const TextStyle(
                            fontSize: 16,
                            fontWeight: FontWeight.bold,
                          ),
                        ),
                ),
                const SizedBox(height: 24),
              ],
            ),
          ),
        ),
      ),
    );
  }

  Future<void> _submit() async {
    if (!_formKey.currentState!.validate()) return;
    _formKey.currentState!.save();

    setState(() => _isLoading = true);
    try {
      final repo = ref.read(projectRepositoryProvider);

      if (_isEditing) {
        await repo.updateTask(
          taskId: widget.task!.id,
          title: _title,
          description: _description.isNotEmpty ? _description : null,
          assigneeName: _assigneeName.isNotEmpty ? _assigneeName : null,
          isBillable: _isBillable,
          hourlyRate: _isBillable ? _hourlyRate : null,
        );
      } else {
        await repo.createTask(
          projectId: widget.projectId,
          title: _title,
          description: _description.isNotEmpty ? _description : null,
          assigneeName: _assigneeName.isNotEmpty ? _assigneeName : null,
          isBillable: _isBillable,
          hourlyRate: _isBillable ? _hourlyRate : null,
        );
      }

      ref.invalidate(projectTasksProvider(widget.projectId));
      if (mounted) Navigator.pop(context);
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(
          context,
        ).showSnackBar(SnackBar(content: Text('Error: $e')));
      }
    } finally {
      if (mounted) setState(() => _isLoading = false);
    }
  }
}