/**
 * Login Screen
 *
 * Handles employee authentication.
 */

import { useState } from 'react';
import {
  View,
  Text,
  TextInput,
  TouchableOpacity,
  StyleSheet,
  KeyboardAvoidingView,
  Platform,
  Alert,
  ActivityIndicator,
  Image,
} from 'react-native';
import { useRouter } from 'expo-router';
import { useAuth } from '../src/hooks/useAuth';

export default function LoginScreen() {
  const [email, setEmail] = useState('');
  const [password, setPassword] = useState('');
  const [isSubmitting, setIsSubmitting] = useState(false);

  const { login } = useAuth();
  const router = useRouter();

  const handleLogin = async () => {
    if (!email.trim()) {
      Alert.alert('Error', 'Please enter your email');
      return;
    }

    if (!password) {
      Alert.alert('Error', 'Please enter your password');
      return;
    }

    setIsSubmitting(true);

    try {
      await login({ email: email.trim().toLowerCase(), password });
      router.replace('/(auth)/jobs');
    } catch (error: any) {
      const message = error?.response?.data?.error || error?.message || 'Login failed. Please try again.';
      Alert.alert('Login Failed', message);
    } finally {
      setIsSubmitting(false);
    }
  };

  return (
    <KeyboardAvoidingView
      behavior={Platform.OS === 'ios' ? 'padding' : 'height'}
      style={styles.container}
    >
      <View style={styles.content}>
        <View style={styles.header}>
          <Image
            source={require('../assets/logo.png')}
            style={styles.logo}
            resizeMode="contain"
          />
          <Text style={styles.title}>SmoothSchedule</Text>
          <Text style={styles.subtitle}>Field Employee App</Text>
        </View>

        <View style={styles.form}>
          <View style={styles.inputContainer}>
            <Text style={styles.label}>Email</Text>
            <TextInput
              style={styles.input}
              placeholder="your.email@company.com"
              placeholderTextColor="#9ca3af"
              value={email}
              onChangeText={setEmail}
              keyboardType="email-address"
              autoCapitalize="none"
              autoComplete="email"
              autoCorrect={false}
              editable={!isSubmitting}
            />
          </View>

          <View style={styles.inputContainer}>
            <Text style={styles.label}>Password</Text>
            <TextInput
              style={styles.input}
              placeholder="Enter your password"
              placeholderTextColor="#9ca3af"
              value={password}
              onChangeText={setPassword}
              secureTextEntry
              autoCapitalize="none"
              autoComplete="password"
              editable={!isSubmitting}
            />
          </View>

          <TouchableOpacity
            style={[styles.button, isSubmitting && styles.buttonDisabled]}
            onPress={handleLogin}
            disabled={isSubmitting}
          >
            {isSubmitting ? (
              <ActivityIndicator color="#fff" />
            ) : (
              <Text style={styles.buttonText}>Sign In</Text>
            )}
          </TouchableOpacity>
        </View>

        <View style={styles.footer}>
          <Text style={styles.footerText}>
            Contact your manager if you need account access
          </Text>
        </View>

        {/* Dev Quick Login */}
        {__DEV__ && (
          <TouchableOpacity
            style={styles.devButton}
            onPress={() => {
              setEmail('timm50@hotmail.com');
              setPassword('starry12');
            }}
          >
            <Text style={styles.devButtonText}>Dev: Fill Test Credentials</Text>
          </TouchableOpacity>
        )}
      </View>
    </KeyboardAvoidingView>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#f9fafb',
  },
  content: {
    flex: 1,
    justifyContent: 'center',
    paddingHorizontal: 24,
  },
  header: {
    alignItems: 'center',
    marginBottom: 48,
  },
  logo: {
    width: 80,
    height: 80,
    marginBottom: 16,
  },
  title: {
    fontSize: 32,
    fontWeight: 'bold',
    color: '#2563eb',
  },
  subtitle: {
    fontSize: 16,
    color: '#6b7280',
    marginTop: 8,
  },
  form: {
    backgroundColor: '#fff',
    borderRadius: 12,
    padding: 24,
    shadowColor: '#000',
    shadowOffset: { width: 0, height: 2 },
    shadowOpacity: 0.1,
    shadowRadius: 4,
    elevation: 3,
  },
  inputContainer: {
    marginBottom: 16,
  },
  label: {
    fontSize: 14,
    fontWeight: '600',
    color: '#374151',
    marginBottom: 8,
  },
  input: {
    backgroundColor: '#f9fafb',
    borderWidth: 1,
    borderColor: '#e5e7eb',
    borderRadius: 8,
    paddingHorizontal: 16,
    paddingVertical: 12,
    fontSize: 16,
    color: '#111827',
  },
  button: {
    backgroundColor: '#2563eb',
    borderRadius: 8,
    paddingVertical: 14,
    alignItems: 'center',
    marginTop: 8,
  },
  buttonDisabled: {
    backgroundColor: '#93c5fd',
  },
  buttonText: {
    color: '#fff',
    fontSize: 16,
    fontWeight: '600',
  },
  footer: {
    marginTop: 32,
    alignItems: 'center',
  },
  footerText: {
    color: '#9ca3af',
    fontSize: 14,
    textAlign: 'center',
  },
  devButton: {
    marginTop: 24,
    backgroundColor: '#fbbf24',
    paddingVertical: 12,
    paddingHorizontal: 20,
    borderRadius: 8,
    alignSelf: 'center',
  },
  devButtonText: {
    color: '#78350f',
    fontSize: 14,
    fontWeight: '600',
  },
});