import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import '../models/project_model.dart';
import '../services/project_service.dart';

class ProjectFormScreen extends StatefulWidget {
  final ProjectModel? project;
  const ProjectFormScreen({super.key, this.project});

  @override
  State<ProjectFormScreen> createState() => _ProjectFormScreenState();
}

class _ProjectFormScreenState extends State<ProjectFormScreen> {
  final _formKey = GlobalKey<FormState>();
  final _nameController = TextEditingController();
  final _gitController = TextEditingController();
  final _apiController = TextEditingController();
  final _descriptionController = TextEditingController();
  final _flavorsController = TextEditingController();
  bool _isLoading = false;

  @override
  void initState() {
    super.initState();
    _nameController.text = widget.project?.name ?? '';
    _gitController.text = widget.project?.gitUrl ?? '';
    _apiController.text = widget.project?.apiDocUrl ?? '';
    _descriptionController.text = widget.project?.description ?? '';
    _flavorsController.text = widget.project?.flavors.join(', ') ?? '';
  }

  @override
  void dispose() {
    _nameController.dispose();
    _gitController.dispose();
    _apiController.dispose();
    _descriptionController.dispose();
    _flavorsController.dispose();
    super.dispose();
  }

  void _submit() async {
    if (!_formKey.currentState!.validate()) return;
    setState(() => _isLoading = true);

    final List<String> flavors = _flavorsController.text
        .split(',')
        .map((e) => e.trim())
        .where((e) => e.isNotEmpty)
        .toList();

    final project = ProjectModel(
      id: widget.project?.id ?? '',
      name: _nameController.text.trim(),
      gitUrl: _gitController.text.trim(),
      apiDocUrl: _apiController.text.trim().isEmpty ? null : _apiController.text.trim(),
      description: _descriptionController.text.trim(),
      flavors: flavors,
      createdAt: widget.project?.createdAt ?? DateTime.now(),
    );

    try {
      if (widget.project == null) {
        await context.read<ProjectService>().addProject(project);
      } else {
        await context.read<ProjectService>().updateProject(project);
      }
      if (mounted) Navigator.pop(context);
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text("Failed: $e")));
      }
    } finally {
      if (mounted) setState(() => _isLoading = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.project == null ? "Create Project" : "Edit Project"),
      ),
      body: SingleChildScrollView(
        padding: const EdgeInsets.all(24),
        child: Form(
          key: _formKey,
          child: Column(
            children: [
              TextFormField(
                controller: _nameController,
                decoration: const InputDecoration(labelText: "Project Name", border: OutlineInputBorder()),
                validator: (v) => v!.isEmpty ? "Required" : null,
              ),
              const SizedBox(height: 16),
              TextFormField(
                controller: _gitController,
                decoration: const InputDecoration(labelText: "Git Repository URL", border: OutlineInputBorder()),
                validator: (v) => v!.isEmpty ? "Required" : null,
              ),
              const SizedBox(height: 16),
              TextFormField(
                controller: _apiController,
                decoration: const InputDecoration(labelText: "API Documentation URL (Optional)", border: OutlineInputBorder()),
              ),
              const SizedBox(height: 16),
              TextFormField(
                controller: _flavorsController,
                decoration: const InputDecoration(
                  labelText: "Flavors (dev, prod, staging...)", 
                  hintText: "Enter comma separated values",
                  border: OutlineInputBorder(),
                ),
              ),
              const SizedBox(height: 16),
              TextFormField(
                controller: _descriptionController,
                maxLines: 5,
                decoration: const InputDecoration(labelText: "Description", border: OutlineInputBorder()),
                validator: (v) => v!.isEmpty ? "Required" : null,
              ),
              const SizedBox(height: 32),
              _isLoading 
                ? const CircularProgressIndicator()
                : ElevatedButton(onPressed: _submit, child: const Text("SAVE PROJECT")),
            ],
          ),
        ),
      ),
    );
  }
}