import React, { useState, useCallback } from 'react';
import {
  View,
  Text,
  StyleSheet,
  KeyboardAvoidingView,
  Platform,
  ScrollView,
} from 'react-native';
import { router, useLocalSearchParams } from 'expo-router';
import { Ionicons } from '@expo/vector-icons';
import { useAuth } from '@/contexts/AuthContext';
import { api } from '@/services/api';
import { Button } from '@/components/ui/Button';
import { Input } from '@/components/ui/Input';
import { ErrorMessage } from '@/components/ui/ErrorMessage';
import { AppColors, BorderRadius, FontSizes, Spacing } from '@/constants/theme';

export default function CompleteProfileScreen() {
  const { email } = useLocalSearchParams<{ email: string }>();
  const { refreshAuth } = useAuth();

  const [firstName, setFirstName] = useState('');
  const [lastName, setLastName] = useState('');
  const [phone, setPhone] = useState('');
  const [isLoading, setIsLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);

  const handleComplete = useCallback(async () => {
    setError(null);

    // Validate
    if (!firstName.trim()) {
      setError('Please enter your first name');
      return;
    }
    if (!lastName.trim()) {
      setError('Please enter your last name');
      return;
    }

    setIsLoading(true);

    try {
      const response = await api.updateProfile({
        firstName: firstName.trim(),
        lastName: lastName.trim(),
        phone: phone.trim() || undefined,
      });

      if (response.ok) {
        // Refresh auth state and go to main app
        await refreshAuth();
        router.replace('/(tabs)');
      } else {
        setError(response.error?.message || 'Failed to update profile');
      }
    } catch (err) {
      setError('Something went wrong. Please try again.');
    } finally {
      setIsLoading(false);
    }
  }, [firstName, lastName, phone, refreshAuth]);

  return (
    <KeyboardAvoidingView
      style={styles.container}
      behavior={Platform.OS === 'ios' ? 'padding' : 'height'}
    >
      <ScrollView
        contentContainerStyle={styles.scrollContent}
        keyboardShouldPersistTaps="handled"
        showsVerticalScrollIndicator={false}
      >
        {/* Header */}
        <View style={styles.header}>
          <View style={styles.iconContainer}>
            <Ionicons name="person-circle-outline" size={48} color={AppColors.primary} />
          </View>
          <Text style={styles.title}>Complete your profile</Text>
          <Text style={styles.subtitle}>
            Just a few more details to get you started
          </Text>
        </View>

        {/* Form */}
        <View style={styles.form}>
          {error && (
            <ErrorMessage
              message={error}
              onDismiss={() => setError(null)}
            />
          )}

          <Input
            label="First Name"
            placeholder="Enter your first name"
            leftIcon="person-outline"
            value={firstName}
            onChangeText={(text) => {
              setFirstName(text);
              setError(null);
            }}
            autoCapitalize="words"
            autoCorrect={false}
            editable={!isLoading}
          />

          <Input
            label="Last Name"
            placeholder="Enter your last name"
            leftIcon="person-outline"
            value={lastName}
            onChangeText={(text) => {
              setLastName(text);
              setError(null);
            }}
            autoCapitalize="words"
            autoCorrect={false}
            editable={!isLoading}
          />

          <Input
            label="Phone (optional)"
            placeholder="Enter your phone number"
            leftIcon="call-outline"
            value={phone}
            onChangeText={setPhone}
            keyboardType="phone-pad"
            editable={!isLoading}
          />

          <Button
            title="Get Started"
            onPress={handleComplete}
            loading={isLoading}
            fullWidth
            size="lg"
          />
        </View>

        {/* Email info */}
        <View style={styles.emailInfo}>
          <Ionicons name="mail-outline" size={16} color={AppColors.textMuted} />
          <Text style={styles.emailText}>{email}</Text>
        </View>
      </ScrollView>
    </KeyboardAvoidingView>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: AppColors.background,
  },
  scrollContent: {
    flexGrow: 1,
    paddingHorizontal: Spacing.lg,
    paddingTop: Spacing.xxl + Spacing.xl,
    paddingBottom: Spacing.xl,
  },
  header: {
    alignItems: 'center',
    marginBottom: Spacing.xl,
  },
  iconContainer: {
    width: 80,
    height: 80,
    borderRadius: BorderRadius.full,
    backgroundColor: `${AppColors.primary}15`,
    justifyContent: 'center',
    alignItems: 'center',
    marginBottom: Spacing.lg,
  },
  title: {
    fontSize: FontSizes['2xl'],
    fontWeight: '700',
    color: AppColors.textPrimary,
    marginBottom: Spacing.sm,
  },
  subtitle: {
    fontSize: FontSizes.base,
    color: AppColors.textSecondary,
    textAlign: 'center',
  },
  form: {
    marginBottom: Spacing.xl,
  },
  emailInfo: {
    flexDirection: 'row',
    justifyContent: 'center',
    alignItems: 'center',
    gap: Spacing.xs,
  },
  emailText: {
    fontSize: FontSizes.sm,
    color: AppColors.textMuted,
  },
});
