import React, { useState } from 'react';
import { View, Text, TextInput, TouchableOpacity, StyleSheet, SafeAreaView, KeyboardAvoidingView, Platform, ScrollView, Alert, ActivityIndicator } from 'react-native';
import { Car, Music } from 'lucide-react-native';
import { colors } from '../../utils/colors';
import { supabase } from '../../services/supabase';
import { makeRedirectUri } from 'expo-auth-session';
import * as WebBrowser from 'expo-web-browser';
import * as QueryParams from 'expo-auth-session/build/QueryParams';

WebBrowser.maybeCompleteAuthSession();
// @ts-ignore
export default function RegisterScreen({ navigation }) {
  const [name, setName] = useState('');
  const [email, setEmail] = useState('');
  const [password, setPassword] = useState('');
  const [confirmPassword, setConfirmPassword] = useState('');
  const [loading, setLoading] = useState(false);

  const handleRegister = async () => {
    if (!name || !email || !password || !confirmPassword) {
      Alert.alert('Erro', 'Por favor preenche todos os campos.');
      return;
    }
    if (password !== confirmPassword) {
      Alert.alert('Erro', 'As passwords não coincidem.');
      return;
    }

    setLoading(true);
    const { error } = await supabase.auth.signUp({
      email,
      password,
      options: {
        data: {
          name: name,
        }
      }
    });

    if (error) {
      Alert.alert('Erro no registo', error.message);
    }
    setLoading(false);
  };

  const handleSpotifyAuth = async () => {
    try {
      const redirectUri = makeRedirectUri();
      const { data, error } = await supabase.auth.signInWithOAuth({
        provider: 'spotify',
        options: {
          redirectTo: redirectUri,
        },
      });

      if (error) throw error;

      if (data?.url) {
        const res = await WebBrowser.openAuthSessionAsync(data.url, redirectUri);
        if (res.type === 'success') {
          const { url } = res;
          const { params, errorCode } = QueryParams.getQueryParams(url);
          if (errorCode) throw new Error(errorCode);
          if (params.access_token && params.refresh_token) {
            await supabase.auth.setSession({
              access_token: params.access_token,
              refresh_token: params.refresh_token,
            });
          }
        }
      }
    } catch (err: any) {
      Alert.alert('Erro', err?.message || 'Ocorreu um erro no Spotify Auth.');
    }
  };

  return (
    <SafeAreaView style={styles.container}>
      <KeyboardAvoidingView 
        behavior={Platform.OS === 'ios' ? 'padding' : 'height'}
        style={styles.keyboardView}
      >
        <ScrollView contentContainerStyle={styles.scrollContent}>
          {/* Header Section */}
          <View style={styles.headerContainer}>
            <View style={styles.iconWrapper}>
              <View style={styles.carIconContainer}>
                <Car color={colors.white} size={32} />
              </View>
              <View style={styles.musicIconContainer}>
                <Music color={colors.primary} size={16} />
              </View>
            </View>
            <Text style={styles.title}>Roadtrip DJ</Text>
            <Text style={styles.subtitle}>Cria a tua conta</Text>
          </View>

          {/* Form Card */}
          <View style={styles.card}>
            <TextInput
              style={styles.input}
              placeholder="Nome"
              placeholderTextColor={colors.textSecondary}
              autoCapitalize="words"
              value={name}
              onChangeText={setName}
            />
            <TextInput
              style={styles.input}
              placeholder="Email"
              placeholderTextColor={colors.textSecondary}
              keyboardType="email-address"
              autoCapitalize="none"
              value={email}
              onChangeText={setEmail}
            />
            <TextInput
              style={styles.input}
              placeholder="Password"
              placeholderTextColor={colors.textSecondary}
              secureTextEntry={true}
              value={password}
              onChangeText={setPassword}
            />
            <TextInput
              style={styles.input}
              placeholder="Confirmar Password"
              placeholderTextColor={colors.textSecondary}
              secureTextEntry={true}
              value={confirmPassword}
              onChangeText={setConfirmPassword}
            />

            <TouchableOpacity 
              style={styles.primaryButton}
              onPress={handleRegister}
              disabled={loading}
            >
              {loading ? (
                <ActivityIndicator color={colors.white} />
              ) : (
                <Text style={styles.primaryButtonText}>Criar Conta</Text>
              )}
            </TouchableOpacity>

            <TouchableOpacity style={styles.spotifyButton} onPress={handleSpotifyAuth}>
              {/* Note: Placeholder Spotify logo */}
              <Music color={colors.white} size={20} style={styles.spotifyIcon} />
              <Text style={styles.spotifyButtonText}>Registar com Spotify</Text>
            </TouchableOpacity>

            <View style={styles.footerContainer}>
              <Text style={styles.footerText}>Já tens conta? </Text>
              <TouchableOpacity onPress={() => navigation.navigate('Login')}>
                <Text style={styles.footerLink}>Entrar</Text>
              </TouchableOpacity>
            </View>
          </View>
        </ScrollView>
      </KeyboardAvoidingView>
    </SafeAreaView>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: colors.primary,
  },
  keyboardView: {
    flex: 1,
  },
  scrollContent: {
    flexGrow: 1,
    justifyContent: 'center',
    alignItems: 'center',
    paddingHorizontal: 20,
    paddingTop: 40,
    paddingBottom: 40,
  },
  headerContainer: {
    alignItems: 'center',
    marginBottom: 30,
  },
  iconWrapper: {
    position: 'relative',
    marginBottom: 20,
    width: 100,
    height: 100,
    alignItems: 'center',
    justifyContent: 'center',
  },
  carIconContainer: {
    width: 80,
    height: 80,
    borderRadius: 40,
    backgroundColor: 'rgba(255, 255, 255, 0.2)',
    alignItems: 'center',
    justifyContent: 'center',
  },
  musicIconContainer: {
    position: 'absolute',
    bottom: 5,
    right: 5,
    width: 32,
    height: 32,
    borderRadius: 16,
    backgroundColor: '#000000',
    alignItems: 'center',
    justifyContent: 'center',
  },
  title: {
    fontSize: 32,
    fontWeight: '800',
    color: colors.white,
    marginBottom: 8,
  },
  subtitle: {
    fontSize: 16,
    color: colors.white,
    fontWeight: '500',
  },
  card: {
    backgroundColor: colors.white,
    width: '100%',
    borderRadius: 24,
    padding: 24,
    shadowColor: '#000',
    shadowOffset: { width: 0, height: 4 },
    shadowOpacity: 0.1,
    shadowRadius: 12,
    elevation: 5,
  },
  input: {
    backgroundColor: colors.inputBackground,
    borderRadius: 12,
    paddingHorizontal: 16,
    paddingVertical: 16,
    fontSize: 16,
    marginBottom: 16,
    color: colors.textMain,
  },
  primaryButton: {
    backgroundColor: colors.primary,
    borderRadius: 12,
    paddingVertical: 16,
    alignItems: 'center',
    marginBottom: 16,
  },
  primaryButtonText: {
    color: colors.white,
    fontSize: 16,
    fontWeight: 'bold',
  },
  spotifyButton: {
    backgroundColor: colors.spotify,
    borderRadius: 12,
    paddingVertical: 16,
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'center',
    marginBottom: 24,
  },
  spotifyIcon: {
    marginRight: 8,
  },
  spotifyButtonText: {
    color: colors.white,
    fontSize: 16,
    fontWeight: 'bold',
  },
  footerContainer: {
    flexDirection: 'row',
    justifyContent: 'center',
    alignItems: 'center',
  },
  footerText: {
    color: colors.textSecondary,
    fontSize: 14,
  },
  footerLink: {
    color: colors.textMain,
    fontSize: 14,
    fontWeight: 'bold',
  },
});