import { Document, Page, Text, View, StyleSheet } from '@react-pdf/renderer';

const styles = StyleSheet.create({
  page: {
    padding: 50,
    fontSize: 10,
    color: '#333',
    fontFamily: 'Helvetica',
  },
  header: {
    flexDirection: 'row',
    justifyContent: 'space-between',
    marginBottom: 40,
  },
  companyInfo: {
    textAlign: 'right',
  },
  title: {
    fontSize: 24,
    color: '#000',
    marginBottom: 20,
  },
  section: {
    marginBottom: 20,
  },
  label: {
    fontSize: 8,
    color: '#999',
    textTransform: 'uppercase',
    marginBottom: 2,
  },
  table: {
    width: 'auto',
    borderStyle: 'solid',
    borderWidth: 1,
    borderColor: '#eee',
    borderRightWidth: 0,
    borderBottomWidth: 0,
    marginBottom: 20,
  },
  tableRow: {
    margin: 'auto',
    flexDirection: 'row',
  },
  tableCol: {
    width: '60%',
    borderStyle: 'solid',
    borderWidth: 1,
    borderColor: '#eee',
    borderLeftWidth: 0,
    borderTopWidth: 0,
    padding: 8,
  },
  tableColPrice: {
    width: '40%',
    borderStyle: 'solid',
    borderWidth: 1,
    borderColor: '#eee',
    borderLeftWidth: 0,
    borderTopWidth: 0,
    padding: 8,
    textAlign: 'right',
  },
  total: {
    flexDirection: 'row',
    justifyContent: 'flex-end',
    marginTop: 20,
    borderTopWidth: 1,
    borderColor: '#000',
    paddingTop: 10,
  },
  totalLabel: {
    fontSize: 11,
    fontWeight: 'bold',
  },
  footer: {
    position: 'absolute',
    bottom: 30,
    left: 50,
    right: 50,
    textAlign: 'center',
    color: '#999',
    fontSize: 8,
    borderTopWidth: 1,
    borderColor: '#eee',
    paddingTop: 10,
  },
  sepaBox: {
    marginTop: 15,
    padding: 10,
    backgroundColor: '#f9f9f9',
    borderWidth: 1,
    borderColor: '#ddd',
  }
});

export const InvoicePDF = ({ order, orderSnapshot, customer }: any) => {
  const items = orderSnapshot?.items ?? [];
  const taxRate = orderSnapshot?.tax_rate ?? 19;
  const isSubscription = order?.type === 'subscription' || orderSnapshot?.billing_cycle === 'monthly';

  const totalNet = items.reduce((sum: number, item: any) => sum + (item.item_total || 0), 0);
  const totalTax = Math.round(totalNet * (taxRate / 100) * 100) / 100;
  const totalGross = Math.round((totalNet + totalTax) * 100) / 100;

  const formattedPrice = (val: number) => 
    new Intl.NumberFormat('de-DE', { style: 'currency', currency: 'EUR' }).format(val);

  return (
    <Document>
      <Page size="A4" style={styles.page}>
        <View style={styles.header}>
          <View>
            <Text style={{ fontSize: 18, fontWeight: 'bold' }}>CASPOS</Text>
            <Text>Die Kasse</Text>
          </View>
          <View style={styles.companyInfo}>
            <Text>CASPOS Computerabrechnungssysteme GmbH</Text>
            <Text>Alte Bundesstraße 16</Text>
            <Text>76846 Hauenstein</Text>
            <Text>Deutschland</Text>
          </View>
        </View>

        <Text style={styles.title}>
          {isSubscription ? 'Vertragsbestätigung (Abonnement)' : 'B2B-Rechnung'}
        </Text>

        <View style={styles.section}>
          <Text style={styles.label}>Kunde</Text>
          <Text>{customer.company_name}</Text>
          <Text>{customer.first_name} {customer.last_name}</Text>
          <Text>{customer.address}</Text>
          <Text>{customer.zip_code} {customer.city}</Text>
          <Text>USt-IdNr: {customer.vat_id}</Text>
        </View>

        <View style={styles.section}>
          <Text style={styles.label}>Bestelldetails</Text>
          <Text>Bestellnummer: {order.order_number || order.id}</Text>
          <Text>Zahlungsart: {isSubscription ? 'SEPA-Lastschrift' : 'Rechnung'}</Text>
          <Text>Datum: {new Date(order.created_at || Date.now()).toLocaleDateString('de-DE')}</Text>
        </View>

        <View style={styles.table}>
          <View style={[styles.tableRow, { backgroundColor: '#f9f9f9' }]}>
            <View style={styles.tableCol}><Text style={{ fontWeight: 'bold' }}>Beschreibung</Text></View>
            <View style={styles.tableColPrice}><Text style={{ fontWeight: 'bold' }}>Preis (netto)</Text></View>
          </View>

          {items.map((item: any, idx: number) => (
            <View key={idx}>
              <View style={styles.tableRow}>
                <View style={styles.tableCol}>
                  <Text style={{ fontWeight: 'bold' }}>{item.product_name} ({item.category_name})</Text>
                </View>
                <View style={styles.tableColPrice}>
                  <Text>
                    {formattedPrice(item.base_price)} {isSubscription ? 'mtl.' : 'einmalig'}
                  </Text>
                </View>
              </View>
              {item.selected_modules?.map((mod: any, mIdx: number) => {
                const qty = mod.quantity || 1;
                const price = mod.total_price ?? (mod.price * qty);
                return (
                  <View key={mIdx} style={styles.tableRow}>
                    <View style={[styles.tableCol, { paddingLeft: 20 }]}>
                      <Text style={{ color: '#666' }}>
                        + {mod.module_name} {qty > 1 ? `(x${qty})` : ''}
                      </Text>
                    </View>
                    <View style={styles.tableColPrice}>
                      <Text style={{ color: '#666' }}>
                        +{formattedPrice(price)}
                      </Text>
                    </View>
                  </View>
                );
              })}
            </View>
          ))}
        </View>

        <View style={styles.total}>
          <View style={{ width: '70%' }}>
            <View style={{ flexDirection: 'row', justifyContent: 'space-between', marginBottom: 3 }}>
              <Text>Netto-Zwischensumme:</Text>
              <Text>{formattedPrice(totalNet)}{isSubscription ? ' / mtl.' : ''}</Text>
            </View>
            <View style={{ flexDirection: 'row', justifyContent: 'space-between', marginBottom: 3 }}>
              <Text>zzgl. {taxRate}% USt:</Text>
              <Text>{formattedPrice(totalTax)}{isSubscription ? ' / mtl.' : ''}</Text>
            </View>
            <View style={{ flexDirection: 'row', justifyContent: 'space-between', marginTop: 5, borderTopWidth: 1, borderTopColor: '#000', paddingTop: 5 }}>
              <Text style={styles.totalLabel}>
                Gesamtbetrag (brutto):
              </Text>
              <Text style={styles.totalLabel}>
                {formattedPrice(totalGross)}{isSubscription ? ' / mtl.' : ''}
              </Text>
            </View>
          </View>
        </View>

        {isSubscription ? (
          <View style={styles.sepaBox}>
            <Text style={{ fontWeight: 'bold', marginBottom: 4 }}>SEPA-Lastschriftmandat</Text>
            <Text style={{ fontSize: 8, color: '#555' }}>
              Ich ermächtige die CASPOS GmbH, Zahlungen von meinem Konto mittels Lastschrift einzuziehen. Zugleich weise ich mein Kreditinstitut an, die von der CASPOS GmbH auf mein Konto gezogenen Lastschriften einzulösen.
            </Text>
            {customer.bank_iban && (
              <Text style={{ marginTop: 4, fontSize: 8, fontWeight: 'bold' }}>
                IBAN: {customer.bank_iban.replace(/(.{4})/g, '$1 ')} · Inhaber: {customer.bank_owner || 'Kunde'}
              </Text>
            )}
          </View>
        ) : (
          <View style={{ marginTop: 20 }}>
            <Text style={{ fontWeight: 'bold' }}>Zahlungsziel</Text>
            <Text style={{ color: '#555' }}>
              Zahlbar innerhalb von 14 Tagen nach Erhalt dieser Rechnung ohne Abzug.
            </Text>
          </View>
        )}

        <View style={styles.footer}>
          <Text>CASPOS Computerabrechnungssysteme GmbH · Amtsgericht Zweibrücken HRB 12345</Text>
          <Text>Dies ist ein automatisch erzeugtes Dokument.</Text>
        </View>
      </Page>
    </Document>
  );
};