/**
 * SetupBanner — self-service credential onboarding banner (D-07).
 *
 * Shown ONLY when meQuery.data?.user.needsProviderSetup === true.
 * NO dismiss/X button — the ONLY way this clears is a successful credential save
 * which invalidates ['me'] → /api/me refetches → needsProviderSetup becomes false
 * → this component unmounts on the next render.
 *
 * Success-only dismissal contract:
 *   CredentialSheet.onSuccess → invalidateQueries(['me']) → meQuery.data.user.needsProviderSetup=false
 *   → SetupBanner returns null → banner disappears.
 *   There is NO other code path that hides this banner.
 *
 * UI-SPEC §Surface 4:
 *   - role="status" + aria-live="polite" (screen readers announce on load)
 *   - KeyRound icon (size 20, var(--color-member-0))
 *   - Heading "Set up your calendar" (15px/600/primary)
 *   - Body copy (13px/400/secondary)
 *   - "Set up now" CTA (accent-filled, minHeight 44px) → opens CredentialSheet in self-service mode
 *   - Card style: var(--color-surface-dim), 1px border, var(--space-2) radius, var(--space-4) padding
 *
 * Security: T-05-24 — all copy is plain-text JSX children, no dangerouslySetInnerHTML.
 */

import { useState, useRef } from 'react';
import { KeyRound } from 'lucide-react';
import { useQuery } from '@tanstack/react-query';
import { fetchMe } from '../api/client.js';
import { CredentialSheet } from './CredentialSheet.js';

export function SetupBanner() {
  const [sheetOpen, setSheetOpen] = useState(false);
  // Use HTMLButtonElement for the ref (assignable to the CredentialSheet's HTMLElement trigger)
  const ctaRef = useRef<HTMLButtonElement>(null);

  // staleTime 0 (gap 6): this banner gates on needsProviderSetup, which is only
  // correct if ['me'] is fresh on entry to the authenticated shell after the
  // wizard claim (see App.tsx for the full mechanism note). With a 5-minute
  // staleTime a pre-claim cache entry kept needsProviderSetup=true and the banner
  // showed even though the operator already configured the calendar in the wizard.
  // The success-only dismissal contract is unchanged: this banner still clears
  // ONLY when needsProviderSetup becomes false (no dismiss/X button).
  const meQuery = useQuery({
    queryKey: ['me'],
    queryFn: fetchMe,
    retry: false,
    staleTime: 0,
  });

  // Only show when needsProviderSetup is explicitly true
  // (undefined / false = no banner)
  if (meQuery.data?.user.needsProviderSetup !== true) return null;

  const memberName = meQuery.data.user.displayName ?? 'Member';

  return (
    <>
      <div
        role="status"
        aria-live="polite"
        style={{
          background: 'var(--color-surface-dim, #F7F7F8)',
          border: '1px solid var(--color-border)',
          borderRadius: 'var(--space-2, 8px)',
          padding: 'var(--space-4, 16px)',
          margin: 'var(--space-4, 16px)',
          display: 'flex',
          alignItems: 'flex-start',
          gap: 'var(--space-3, 12px)',
          fontFamily: 'var(--font-family-base)',
        }}
      >
        <KeyRound
          size={20}
          aria-hidden="true"
          style={{ color: 'var(--color-member-0, #4A90D9)', flexShrink: 0, marginTop: '2px' }}
        />

        <div style={{ flex: 1, minWidth: 0 }}>
          <div
            style={{
              fontSize: 'var(--text-body-size, 15px)',
              fontWeight: 600,
              color: 'var(--color-text-primary)',
              lineHeight: 1.4,
              marginBottom: 'var(--space-1, 4px)',
            }}
          >
            Set up your calendar
          </div>
          <div
            style={{
              fontSize: 'var(--text-label-size, 13px)',
              fontWeight: 400,
              color: 'var(--color-text-secondary)',
              lineHeight: 1.4,
              marginBottom: 'var(--space-3, 12px)',
            }}
          >
            To sync your Fastmail calendar, you need to add an app password. This takes about a
            minute.
          </div>

          {/* CTA — no X/dismiss: the ONLY exit is a successful credential save */}
          <button
            ref={ctaRef}
            type="button"
            onClick={() => setSheetOpen(true)}
            style={{
              background: 'var(--color-member-0, #4A90D9)',
              color: '#ffffff',
              border: 'none',
              cursor: 'pointer',
              fontSize: 'var(--text-label-size, 13px)',
              fontWeight: 600,
              minHeight: '44px',
              minWidth: '44px',
              padding: '0 var(--space-4, 16px)',
              borderRadius: 'var(--space-1, 4px)',
              fontFamily: 'var(--font-family-base)',
            }}
          >
            Set up now
          </button>
        </div>
      </div>

      {/* CredentialSheet in self-service mode.
          On success: invalidates ['me'] → needsProviderSetup=false → this component unmounts. */}
      <CredentialSheet
        isOpen={sheetOpen}
        onClose={() => setSheetOpen(false)}
        mode="self-service"
        memberName={memberName}
        triggerRef={ctaRef}
      />
    </>
  );
}