import 'package:flutter/material.dart';
import 'package:supabase_flutter/supabase_flutter.dart';
import 'package:tugas_akhir_supabase/screens/auth/reset_password_otp_screen.dart';

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

  @override
  State<ForgotPasswordScreen> createState() => _ForgotPasswordScreenState();
}

class _ForgotPasswordScreenState extends State<ForgotPasswordScreen> {
  final _emailController = TextEditingController();
  final _formKey = GlobalKey<FormState>();
  bool _loading = false;
  final supabase = Supabase.instance.client;
  final Color primaryColor = const Color(0xFF056839);

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

    setState(() => _loading = true);

    try {
      // Check if email exists in the database
      final String emailToSearch = _emailController.text.trim();
      final List<dynamic> userCheck = await supabase
          .from('profiles') 
          .select('user_id') 
          .ilike('email', emailToSearch) // Using ilike for case-insensitive search
          .limit(1);

      if (!mounted) return;

      if (userCheck.isEmpty) {
        // Email does not exist
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text('Email tidak terdaftar. Mohon periksa kembali email yang Anda masukkan.', style: const TextStyle(color: Colors.white)),
            backgroundColor: Colors.redAccent,
            behavior: SnackBarBehavior.floating,
            shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(10)),
          ),
        );
        return; // Stop the process
      }

      // Email exists, proceed to OTP screen
      Navigator.of(context).push(
        MaterialPageRoute(
          builder: (context) => ResetPasswordOtpScreen(
            email: _emailController.text.trim(),
          ),
        ),
      );
    } catch (error) {
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
          content: Text('Gagal memproses permintaan. Silakan coba lagi nanti.', style: const TextStyle(color: Colors.white)),
          backgroundColor: Colors.redAccent,
          behavior: SnackBarBehavior.floating,
          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(10)),
        ),
      );
    } finally {
      if (mounted) {
        setState(() => _loading = false);
      }
    }
  }

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

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

    return Scaffold(
      backgroundColor: Colors.grey[100], // Light background for contrast
      appBar: AppBar(
        title: const Text(
          'Lupa Password',
          style: TextStyle(color: Colors.white, fontWeight: FontWeight.bold),
        ),
        backgroundColor: primaryColor,
        elevation: 0,
        iconTheme: const IconThemeData(color: Colors.white),
      ),
      body: SingleChildScrollView( 
        padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 32),
        child: Form(
          key: _formKey,
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: [
              Image.asset(
                'assets/images/logo.png', 
                height: 120,
              ),
              const SizedBox(height: 32),
              Text(
                'Ubah Password Anda', // This was changed by user
                textAlign: TextAlign.center,
                style: theme.textTheme.headlineSmall?.copyWith(
                  fontWeight: FontWeight.bold,
                  color: Colors.black87,
                ),
              ),
              const SizedBox(height: 12),
              Text(
                'Masukkan alamat email yang terhubung dengan akun Anda untuk melanjutkan.',
                textAlign: TextAlign.center,
                style: theme.textTheme.bodyMedium?.copyWith(color: Colors.black54),
              ),
              const SizedBox(height: 32),
              TextFormField(
                controller: _emailController,
                decoration: InputDecoration(
                  hintText: 'Email Anda',
                  prefixIcon: Icon(Icons.email_outlined, color: primaryColor),
                  filled: true,
                  fillColor: Colors.white,
                  border: OutlineInputBorder(
                    borderRadius: BorderRadius.circular(12),
                    borderSide: BorderSide.none,
                  ),
                  focusedBorder: OutlineInputBorder(
                    borderRadius: BorderRadius.circular(12),
                    borderSide: BorderSide(color: primaryColor, width: 2),
                  ),
                  contentPadding: const EdgeInsets.symmetric(vertical: 16, horizontal: 20),
                ),
                keyboardType: TextInputType.emailAddress,
                validator: (val) {
                  if (val == null || val.isEmpty) return 'Email tidak boleh kosong';
                  if (!RegExp(r"^[a-zA-Z0-9.a-zA-Z0-9.!#$%&'*+-/=?^_`{|}~]+@[a-zA-Z0-9]+\.[a-zA-Z]+").hasMatch(val)) {
                    return 'Masukkan alamat email yang valid';
                  }
                  return null;
                },
                style: const TextStyle(color: Colors.black87),
              ),
              const SizedBox(height: 24),
              ElevatedButton(
                style: ElevatedButton.styleFrom(
                  backgroundColor: primaryColor,
                  padding: const EdgeInsets.symmetric(vertical: 16),
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(12),
                  ),
                  elevation: 2,
                ),
                onPressed: _loading ? null : _sendResetEmail,
                child: _loading
                    ? const SizedBox(
                        height: 24,
                        width: 24,
                        child: CircularProgressIndicator(
                          color: Colors.white,
                          strokeWidth: 3,
                        ),
                      )
                    : const Text(
                        'Lanjutkan',
                        style: TextStyle(
                          fontSize: 16,
                          fontWeight: FontWeight.bold,
                          color: Colors.white,
                        ),
                      ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}