import { useContactCalendar, useIntegrations } from '../hooks';
import { integrationsApi } from '../api';
import type { M365CalendarEvent } from '../types';

interface Props {
  contactId: string;
}

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

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

  const { data, isLoading, error } = useContactCalendar(contactId);
  const events: M365CalendarEvent[] = 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 Kalendertermine 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' }}>Kalendertermine konnten nicht geladen werden.</p>;
  }

  if (events.length === 0) {
    return <p style={{ color: 'var(--color-text-muted)', fontSize: '0.875rem', padding: '1rem 0' }}>Keine Kalendertermine in den nächsten 90 Tagen.</p>;
  }

  return (
    <div style={{ display: 'flex', flexDirection: 'column', gap: '0.5rem' }}>
      {events.map((event) => (
        <a
          key={event.id}
          href={event.webLink}
          target="_blank"
          rel="noopener noreferrer"
          style={{
            display: 'block',
            padding: '0.75rem 1rem',
            background: 'var(--color-bg-card)',
            border: '1px solid var(--color-border)',
            borderRadius: 'var(--radius-sm)',
            textDecoration: 'none',
            borderLeft: '3px solid var(--color-primary)',
          }}
        >
          <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'flex-start', gap: '0.5rem' }}>
            <span style={{ fontSize: '0.875rem', fontWeight: 600, color: 'var(--color-text)', flex: 1 }}>
              {event.subject}
            </span>
            {event.isOnlineMeeting && (
              <span style={{
                fontSize: '0.6875rem',
                fontWeight: 600,
                padding: '0.125rem 0.375rem',
                background: '#dbeafe',
                color: '#1e40af',
                borderRadius: '999px',
                flexShrink: 0,
              }}>
                Online
              </span>
            )}
          </div>
          <div style={{ fontSize: '0.8125rem', color: 'var(--color-text-muted)', marginTop: '0.25rem' }}>
            {formatEventDate(event.start.dateTime)} – {new Date(event.end.dateTime).toLocaleTimeString('de-DE', { hour: '2-digit', minute: '2-digit' })}
          </div>
          {event.location?.displayName && (
            <div style={{ fontSize: '0.8125rem', color: 'var(--color-text-secondary)', marginTop: '0.125rem' }}>
              📍 {event.location.displayName}
            </div>
          )}
        </a>
      ))}
    </div>
  );
}