import {
  View, Text, TextInput, TouchableOpacity,
  KeyboardAvoidingView, Platform, ActivityIndicator, StyleSheet,
} from 'react-native'
import { useState } from 'react'
import { useRouter } from 'expo-router'
import { SafeAreaView } from 'react-native-safe-area-context'
import { Ionicons } from '@expo/vector-icons'
import { authClient } from '@/lib/auth-client'

export default function LoginScreen() {
  const router = useRouter()
  const [email, setEmail] = useState('')
  const [loading, setLoading] = useState(false)
  const [error, setError] = useState('')

  const canSubmit = email.trim().length > 0 && !loading

  async function handleSendLink() {
    if (!email.trim()) return
    setLoading(true)
    setError('')
    const result = await authClient.signIn.magicLink({
      email: email.trim().toLowerCase(),
      callbackURL: '/home',
    })
    setLoading(false)
    if (result.error) {
      setError(result.error.message ?? 'Ein Fehler ist aufgetreten.')
    } else {
      router.push({ pathname: '/(auth)/check-email', params: { email } })
    }
  }

  return (
    <SafeAreaView style={styles.safeArea}>
      <KeyboardAvoidingView
        behavior={Platform.OS === 'ios' ? 'padding' : 'height'}
        style={styles.keyboardView}
      >
        <View style={styles.content}>
          <View style={styles.logoSection}>
            <View style={styles.logoBox}>
              <Text style={styles.logoLetter}>I</Text>
            </View>
            <Text style={styles.appName}>InnungsApp</Text>
            <Text style={styles.tagline}>Ihre Kreishandwerkerschaft digital</Text>
          </View>

          <View style={styles.form}>
            <Text style={styles.inputLabel}>Email-Adresse</Text>
            <View style={styles.inputWrap}>
              <Ionicons name="mail-outline" size={18} color="#94A3B8" />
              <TextInput
                style={styles.input}
                placeholder="beispiel@handwerk.de"
                placeholderTextColor="#94A3B8"
                keyboardType="email-address"
                autoCapitalize="none"
                autoCorrect={false}
                value={email}
                onChangeText={setEmail}
                onSubmitEditing={handleSendLink}
                returnKeyType="go"
              />
            </View>

            {error ? (
              <View style={styles.errorBox}>
                <Text style={styles.errorText}>{error}</Text>
              </View>
            ) : null}

            <TouchableOpacity
              onPress={handleSendLink}
              disabled={!canSubmit}
              style={[styles.submitBtn, !canSubmit && styles.submitBtnDisabled]}
              activeOpacity={0.85}
            >
              {loading ? (
                <ActivityIndicator color="#FFFFFF" />
              ) : (
                <View style={styles.submitContent}>
                  <Text style={styles.submitLabel}>Login-Link senden</Text>
                  <Ionicons name="arrow-forward" size={16} color="#FFFFFF" />
                </View>
              )}
            </TouchableOpacity>
          </View>

          <Text style={styles.hint}>
            Noch kein Zugang? Kontaktieren Sie Ihre Innungsgeschaeftsstelle.
          </Text>
        </View>
      </KeyboardAvoidingView>
    </SafeAreaView>
  )
}

const styles = StyleSheet.create({
  safeArea: {
    flex: 1,
    backgroundColor: '#FFFFFF',
  },
  keyboardView: {
    flex: 1,
  },
  content: {
    flex: 1,
    justifyContent: 'center',
    paddingHorizontal: 24,
  },
  logoSection: {
    alignItems: 'center',
    marginBottom: 40,
  },
  logoBox: {
    width: 64,
    height: 64,
    backgroundColor: '#003B7E',
    borderRadius: 18,
    alignItems: 'center',
    justifyContent: 'center',
    marginBottom: 16,
  },
  logoLetter: {
    color: '#FFFFFF',
    fontSize: 30,
    fontWeight: '900',
  },
  appName: {
    fontSize: 30,
    fontWeight: '800',
    color: '#0F172A',
    letterSpacing: -0.6,
    marginBottom: 4,
  },
  tagline: {
    fontSize: 14,
    color: '#64748B',
    textAlign: 'center',
  },
  form: {
    gap: 12,
  },
  inputLabel: {
    fontSize: 14,
    fontWeight: '700',
    color: '#334155',
  },
  inputWrap: {
    flexDirection: 'row',
    alignItems: 'center',
    backgroundColor: '#F8FAFC',
    borderRadius: 14,
    borderWidth: 1,
    borderColor: '#E2E8F0',
    paddingHorizontal: 12,
    gap: 8,
  },
  input: {
    flex: 1,
    paddingVertical: 13,
    color: '#0F172A',
    fontSize: 15,
  },
  errorBox: {
    backgroundColor: '#FEF2F2',
    borderWidth: 1,
    borderColor: '#FECACA',
    borderRadius: 12,
    paddingHorizontal: 14,
    paddingVertical: 10,
  },
  errorText: {
    color: '#B91C1C',
    fontSize: 13,
  },
  submitBtn: {
    backgroundColor: '#003B7E',
    borderRadius: 14,
    paddingVertical: 14,
    alignItems: 'center',
    marginTop: 4,
  },
  submitBtnDisabled: {
    backgroundColor: '#CBD5E1',
  },
  submitContent: {
    flexDirection: 'row',
    alignItems: 'center',
    gap: 6,
  },
  submitLabel: {
    color: '#FFFFFF',
    fontWeight: '700',
    fontSize: 15,
  },
  hint: {
    marginTop: 24,
    textAlign: 'center',
    color: '#64748B',
    fontSize: 13,
    lineHeight: 18,
  },
})
