import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';
import 'package:lottie/lottie.dart';
import 'dart:math' as math;

Future<void> showLoginSheet(BuildContext context) {
  return showModalBottomSheet<void>(
    context: context,
    isScrollControlled: true,
    backgroundColor: Colors.transparent,
    shape: const RoundedRectangleBorder(
      borderRadius: BorderRadius.vertical(top: Radius.circular(20)),
    ),
    builder: (ctx) => const _AnimatedAuthSheet(child: LoginBottomSheet()),
  );
}

class _AnimatedAuthSheet extends StatelessWidget {
  const _AnimatedAuthSheet({required this.child});

  final Widget child;

  @override
  Widget build(BuildContext context) {
    final size = MediaQuery.sizeOf(context);
    const topRadius = Radius.circular(20);

    return TweenAnimationBuilder<double>(
      tween: Tween<double>(begin: 0.0, end: 1.0),
      duration: const Duration(milliseconds: 260),
      curve: Curves.easeOutCubic,
      builder: (context, t, w) {
        return Opacity(
          opacity: t,
          child: Transform.translate(
            offset: Offset(0, (1 - t) * 12),
            child: w,
          ),
        );
      },
      child: ClipRRect(
        borderRadius: const BorderRadius.vertical(top: topRadius),
        child: Material(
          color: Colors.transparent,
          child: Stack(
            clipBehavior: Clip.none,
            children: [
              Positioned.fill(
                child: Container(
                  decoration: const BoxDecoration(
                    gradient: LinearGradient(
                      begin: Alignment.topCenter,
                      end: Alignment.bottomCenter,
                      colors: [
                        Color(0xFFFFE6F1),
                        Color(0xFFFFC9DF),
                      ],
                    ),
                  ),
                ),
              ),
              Positioned(
                left: -size.width * 0.38,
                bottom: -size.width * 0.45,
                child: IgnorePointer(
                  child: SizedBox(
                    width: size.width * 1.05,
                    height: size.width * 1.05,
                    child: Transform.rotate(
                      angle: 28 * math.pi / 180,
                      child: Opacity(
                        opacity: 0.95,
                        child: Lottie.asset(
                          'lottie/Liquid waves.json',
                          fit: BoxFit.cover,
                          repeat: true,
                        ),
                      ),
                    ),
                  ),
                ),
              ),
              child,
            ],
          ),
        ),
      ),
    );
  }
}

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

  @override
  State<LoginBottomSheet> createState() => _LoginBottomSheetState();
}

class _LoginBottomSheetState extends State<LoginBottomSheet> {
  final _formKey = GlobalKey<FormState>();

  final _emailController = TextEditingController();
  final _passwordController = TextEditingController();

  bool _loading = false;

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

  @override
  Widget build(BuildContext context) {
    final viewInsets = MediaQuery.viewInsetsOf(context);
    const accentPink = Color(0xFFFF55A7);
    const primaryTeal = Color(0xFF2F9E94);
    final underlineBorder = UnderlineInputBorder(
      borderSide: BorderSide(color: Colors.black.withValues(alpha: 0.20)),
    );

    return Padding(
      padding: EdgeInsets.only(
        left: 16,
        right: 16,
        top: 12,
        bottom: 16 + viewInsets.bottom,
      ),
      child: ConstrainedBox(
        constraints: const BoxConstraints(maxHeight: 520),
        child: SingleChildScrollView(
          child: Form(
            key: _formKey,
            child: Column(
              mainAxisSize: MainAxisSize.min,
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children: [
                Center(
                  child: Container(
                    width: 46,
                    height: 5,
                    decoration: BoxDecoration(
                      color: Colors.black.withValues(alpha: 0.10),
                      borderRadius: BorderRadius.circular(99),
                    ),
                  ),
                ),
                const SizedBox(height: 14),
                const Text(
                  'Entrar',
                  textAlign: TextAlign.center,
                  style: TextStyle(
                    fontSize: 18,
                    fontWeight: FontWeight.w800,
                    color: accentPink,
                  ),
                ),
                const SizedBox(height: 16),
                TextFormField(
                  controller: _emailController,
                  keyboardType: TextInputType.emailAddress,
                  textInputAction: TextInputAction.next,
                  decoration: InputDecoration(
                    labelText: 'Email',
                    border: underlineBorder,
                    enabledBorder: underlineBorder,
                    focusedBorder: underlineBorder.copyWith(
                      borderSide: const BorderSide(color: primaryTeal, width: 1.6),
                    ),
                    floatingLabelStyle: const TextStyle(color: primaryTeal, fontWeight: FontWeight.w700),
                  ),
                  validator: (v) {
                    final value = (v ?? '').trim();
                    if (value.isEmpty) return 'Informe seu email';
                    if (!value.contains('@')) return 'Email inválido';
                    return null;
                  },
                ),
                const SizedBox(height: 12),
                TextFormField(
                  controller: _passwordController,
                  obscureText: true,
                  textInputAction: TextInputAction.done,
                  decoration: InputDecoration(
                    labelText: 'Senha',
                    border: underlineBorder,
                    enabledBorder: underlineBorder,
                    focusedBorder: underlineBorder.copyWith(
                      borderSide: const BorderSide(color: primaryTeal, width: 1.6),
                    ),
                    floatingLabelStyle: const TextStyle(color: primaryTeal, fontWeight: FontWeight.w700),
                  ),
                  validator: (v) {
                    final value = (v ?? '');
                    if (value.isEmpty) return 'Informe sua senha';
                    if (value.length < 6) return 'Mínimo de 6 caracteres';
                    return null;
                  },
                ),
                const SizedBox(height: 16),
                SizedBox(
                  height: 46,
                  child: FilledButton(
                    style: FilledButton.styleFrom(
                      backgroundColor: primaryTeal,
                      foregroundColor: const Color.fromARGB(255, 255, 255, 255),
                      shape: const StadiumBorder(),
                      textStyle: const TextStyle(fontWeight: FontWeight.w800),
                    ),
                    onPressed: _loading ? null : _submit,
                    child: _loading
                        ? const SizedBox(
                            width: 18,
                            height: 18,
                            child: CircularProgressIndicator(strokeWidth: 2),
                          )
                        : const Text('Entrar'),
                  ),
                ),
                const SizedBox(height: 8),
                TextButton(
                  onPressed: _loading ? null : () => Navigator.of(context).pop(),
                  child: const Text('Fechar'),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }

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

    setState(() => _loading = true);
    try {
      final email = _emailController.text.trim();
      final password = _passwordController.text;

      await FirebaseAuth.instance.signInWithEmailAndPassword(
        email: email,
        password: password,
      );

      if (!mounted) return;
      Navigator.of(context).pop();
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Login efetuado')),
      );
    } on FirebaseAuthException catch (e) {
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text(_friendlyAuthError(e))),
      );
    } catch (e) {
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text('Erro: $e')),
      );
    } finally {
      if (mounted) setState(() => _loading = false);
    }
  }

  String _friendlyAuthError(FirebaseAuthException e) {
    switch (e.code) {
      case 'invalid-email':
        return 'Email inválido.';
      case 'user-disabled':
        return 'Usuário desativado.';
      case 'user-not-found':
      case 'wrong-password':
      case 'invalid-credential':
        return 'Email ou senha incorretos.';
      default:
        return e.message ?? 'Falha de autenticação.';
    }
  }
}