import { useContactEmails, useIntegrations } from '../hooks';
import { integrationsApi } from '../api';
import type { M365Email } from '../types';

interface Props {
  contactId: string;
}

function formatEmailDate(iso: string): string {
  return new Date(iso).toLocaleString('de-DE', {
    day: '2-digit',
    month: '2-digit',
    year: 'numeric',
    hour: '2-digit',
    minute: '2-digit',
  });
}

export function EmailsTab({ contactId }: Props) {
  const { data: integrationsData } = useIntegrations();
  const isConnected = integrationsData?.data?.some(
    (i) => i.provider === 'MICROSOFT_365' && i.connected,
  ) ?? false;

  const { data, isLoading, error } = useContactEmails(contactId);
  const emails: M365Email[] = data?.data ?? [];

  if (!isConnected) {
    return (
      <div style={{ padding: '1.5rem 0', textAlign: 'center' }}>
        <p style={{ color: 'var(--color-text-muted)', fontSize: '0.9375rem', marginBottom: '1rem' }}>
          Verbinden Sie Microsoft 365, um E-Mails zu diesem Kontakt zu sehen.
        </p>
        <button
          type="button"
          onClick={() => integrationsApi.connectM365()}
          style={{
            display: 'inline-flex',
            alignItems: 'center',
            gap: '0.5rem',
            padding: '0.4375rem 1rem',
            background: 'var(--color-primary)',
            color: 'white',
            border: 'none',
            borderRadius: 'var(--radius-sm)',
            fontSize: '0.875rem',
            fontWeight: 600,
            cursor: 'pointer',
          }}
        >
          Microsoft 365 verbinden
        </button>
      </div>
    );
  }

  if (isLoading) {
    return <p style={{ color: 'var(--color-text-muted)', fontSize: '0.875rem', padding: '1rem 0' }}>Laden…</p>;
  }

  if (error) {
    return <p style={{ color: 'var(--color-error)', fontSize: '0.875rem', padding: '1rem 0' }}>E-Mails konnten nicht geladen werden.</p>;
  }

  if (emails.length === 0) {
    return <p style={{ color: 'var(--color-text-muted)', fontSize: '0.875rem', padding: '1rem 0' }}>Keine E-Mails gefunden.</p>;
  }

  return (
    <div style={{ display: 'flex', flexDirection: 'column', gap: '0.5rem' }}>
      {emails.map((email) => (
        <a
          key={email.id}
          href={email.webLink}
          target="_blank"
          rel="noopener noreferrer"
          style={{
            display: 'block',
            padding: '0.75rem 1rem',
            background: email.isRead ? 'var(--color-bg-card)' : 'var(--color-bg-subtle, var(--color-bg-card))',
            border: '1px solid var(--color-border)',
            borderRadius: 'var(--radius-sm)',
            textDecoration: 'none',
            borderLeft: email.isRead ? undefined : '3px solid var(--color-primary)',
          }}
        >
          <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'flex-start', gap: '0.5rem' }}>
            <span style={{
              fontSize: '0.875rem',
              fontWeight: email.isRead ? 400 : 600,
              color: 'var(--color-text)',
              flex: 1,
              overflow: 'hidden',
              textOverflow: 'ellipsis',
              whiteSpace: 'nowrap',
            }}>
              {email.subject || '(kein Betreff)'}
            </span>
            <span style={{ fontSize: '0.75rem', color: 'var(--color-text-muted)', flexShrink: 0 }}>
              {formatEmailDate(email.receivedDateTime)}
            </span>
          </div>
          <div style={{ fontSize: '0.8125rem', color: 'var(--color-text-muted)', marginTop: '0.25rem' }}>
            Von: {email.from?.emailAddress?.name ?? email.from?.emailAddress?.address ?? '—'}
          </div>
          {email.bodyPreview && (
            <div style={{
              fontSize: '0.8125rem',
              color: 'var(--color-text-secondary)',
              marginTop: '0.25rem',
              overflow: 'hidden',
              textOverflow: 'ellipsis',
              whiteSpace: 'nowrap',
            }}>
              {email.bodyPreview}
            </div>
          )}
        </a>
      ))}
    </div>
  );
}