import { useCallback, useEffect, useState } from 'react';
import {
  ActivityIndicator,
  KeyboardAvoidingView,
  Modal,
  Platform,
  Pressable,
  StyleSheet,
  Text,
  TextInput,
  View,
} from 'react-native';

import {
  createResourceHistoryItem,
  fetchResourceHistory,
  HistoryItem,
} from '@/src/lib/api';
import { useAuth } from '@/src/providers/auth-provider';

const PRIMARY = '#69c350';

type HistorySectionProps = {
  resource: string;
  resourceId: number | string;
};

function formatDateTime(value: unknown): string {
  if (!value) return '-';
  const date = new Date(String(value));
  if (Number.isNaN(date.getTime())) return String(value);
  return date.toLocaleString('de-DE', {
    day: '2-digit',
    month: '2-digit',
    year: '2-digit',
    hour: '2-digit',
    minute: '2-digit',
  });
}

function getAuthor(item: HistoryItem): string {
  if (!item.created_by && !item.createdBy) return 'FEDEO Bot';
  return String(
    item.created_by_profile?.full_name ||
      item.created_by_profile?.fullName ||
      item.created_by_profile?.email ||
      'Benutzer'
  );
}

export function HistorySection({ resource, resourceId }: HistorySectionProps) {
  const { token } = useAuth();
  const [items, setItems] = useState<HistoryItem[]>([]);
  const [loading, setLoading] = useState(true);
  const [loadError, setLoadError] = useState<string | null>(null);
  const [formError, setFormError] = useState<string | null>(null);
  const [modalOpen, setModalOpen] = useState(false);
  const [text, setText] = useState('');
  const [saving, setSaving] = useState(false);

  const load = useCallback(async () => {
    if (!token || !resource || !resourceId) return;
    setLoading(true);
    setLoadError(null);
    try {
      const rows = await fetchResourceHistory(token, resource, resourceId);
      setItems((rows || []).slice().reverse());
    } catch (err) {
      setLoadError(err instanceof Error ? err.message : 'Das Logbuch konnte nicht geladen werden.');
    } finally {
      setLoading(false);
    }
  }, [resource, resourceId, token]);

  useEffect(() => {
    void load();
  }, [load]);

  function closeModal() {
    if (saving) return;
    setModalOpen(false);
    setText('');
    setFormError(null);
  }

  async function addItem() {
    if (!token || saving) return;
    const value = text.trim();
    if (!value) {
      setFormError('Bitte einen Text für den Logbucheintrag eingeben.');
      return;
    }

    setSaving(true);
    setFormError(null);
    try {
      await createResourceHistoryItem(token, resource, resourceId, value);
      setModalOpen(false);
      setText('');
      await load();
    } catch (err) {
      setFormError(err instanceof Error ? err.message : 'Der Logbucheintrag konnte nicht gespeichert werden.');
    } finally {
      setSaving(false);
    }
  }

  return (
    <View style={styles.card}>
      <View style={styles.header}>
        <Text style={styles.title}>Logbuch ({items.length})</Text>
        <Pressable style={styles.addButton} onPress={() => setModalOpen(true)}>
          <Text style={styles.addButtonText}>+ Eintrag</Text>
        </Pressable>
      </View>

      {loading ? <ActivityIndicator /> : null}
      {!loading && loadError ? <Text style={styles.error}>{loadError}</Text> : null}
      {!loading && !loadError && items.length === 0 ? (
        <Text style={styles.empty}>Noch keine Logbucheinträge vorhanden.</Text>
      ) : null}

      {!loading && !loadError
        ? items.map((item) => (
            <View key={String(item.id)} style={styles.item}>
              <Text style={styles.itemAuthor}>{getAuthor(item)}</Text>
              <Text style={styles.itemText}>{item.text}</Text>
              <Text style={styles.itemDate}>{formatDateTime(item.created_at || item.createdAt)}</Text>
            </View>
          ))
        : null}

      <Modal visible={modalOpen} transparent animationType="fade" onRequestClose={closeModal}>
        <View style={styles.modalOverlay}>
          <KeyboardAvoidingView
            behavior={Platform.OS === 'ios' ? 'padding' : undefined}
            style={styles.modalKeyboardWrap}>
            <View style={styles.modalCard}>
              <Text style={styles.modalTitle}>Logbucheintrag hinzufügen</Text>
              <TextInput
                autoFocus
                multiline
                placeholder="Was soll im Logbuch festgehalten werden?"
                placeholderTextColor="#9ca3af"
                style={styles.input}
                value={text}
                onChangeText={setText}
              />
              {formError ? <Text style={styles.error}>{formError}</Text> : null}
              <View style={styles.modalActions}>
                <Pressable style={styles.secondaryButton} onPress={closeModal} disabled={saving}>
                  <Text style={styles.secondaryButtonText}>Abbrechen</Text>
                </Pressable>
                <Pressable
                  style={[styles.primaryButton, saving ? styles.disabled : null]}
                  onPress={addItem}
                  disabled={saving}>
                  <Text style={styles.primaryButtonText}>{saving ? 'Speichere...' : 'Speichern'}</Text>
                </Pressable>
              </View>
            </View>
          </KeyboardAvoidingView>
        </View>
      </Modal>
    </View>
  );
}

const styles = StyleSheet.create({
  card: {
    backgroundColor: '#ffffff',
    borderRadius: 12,
    borderWidth: 1,
    borderColor: '#e5e7eb',
    padding: 12,
    gap: 8,
  },
  header: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    gap: 10,
  },
  title: { color: '#111827', fontSize: 16, fontWeight: '700' },
  addButton: {
    minHeight: 36,
    borderRadius: 8,
    backgroundColor: PRIMARY,
    paddingHorizontal: 12,
    alignItems: 'center',
    justifyContent: 'center',
  },
  addButtonText: { color: '#ffffff', fontSize: 13, fontWeight: '700' },
  item: {
    borderTopWidth: 1,
    borderTopColor: '#e5e7eb',
    paddingTop: 9,
    gap: 2,
  },
  itemAuthor: { color: '#111827', fontSize: 13, fontWeight: '700' },
  itemText: { color: '#374151', fontSize: 14, lineHeight: 20 },
  itemDate: { color: '#6b7280', fontSize: 12 },
  empty: { color: '#6b7280', fontSize: 13, paddingVertical: 4 },
  error: { color: '#dc2626', fontSize: 13 },
  modalOverlay: {
    flex: 1,
    backgroundColor: 'rgba(17, 24, 39, 0.45)',
    justifyContent: 'center',
    padding: 20,
  },
  modalKeyboardWrap: { width: '100%' },
  modalCard: { backgroundColor: '#ffffff', borderRadius: 14, padding: 16, gap: 12 },
  modalTitle: { color: '#111827', fontSize: 18, fontWeight: '700' },
  input: {
    minHeight: 120,
    borderWidth: 1,
    borderColor: '#d1d5db',
    borderRadius: 10,
    paddingHorizontal: 12,
    paddingVertical: 10,
    color: '#111827',
    fontSize: 15,
    textAlignVertical: 'top',
  },
  modalActions: { flexDirection: 'row', justifyContent: 'flex-end', gap: 8 },
  secondaryButton: {
    minHeight: 40,
    borderWidth: 1,
    borderColor: '#d1d5db',
    borderRadius: 10,
    paddingHorizontal: 14,
    alignItems: 'center',
    justifyContent: 'center',
  },
  secondaryButtonText: { color: '#374151', fontWeight: '600' },
  primaryButton: {
    minHeight: 40,
    borderRadius: 10,
    backgroundColor: PRIMARY,
    paddingHorizontal: 14,
    alignItems: 'center',
    justifyContent: 'center',
  },
  primaryButtonText: { color: '#ffffff', fontWeight: '700' },
  disabled: { opacity: 0.6 },
});