import { useContext, useEffect, useRef, useState, type KeyboardEvent } from 'react';
import { ChevronDown, LogOut, UserRound } from 'lucide-react';
import { logout } from './api';
import { AuthContext } from './AuthGate';
import { canLeaveCurrentScreen } from './navigationGuard';

// TopBar sign-out control (#295). Shows the authenticated username and a Sign out action: it consults the
// unsaved-changes guard first (so a dirty draft isn't lost), POSTs `/api/v1/auth/logout` (the client adds the
// required X-CSRF header), and on 204 flips the boot gate back to the login screen via AuthContext.signOut.
export function UserMenu() {
  const { username, signOut } = useContext(AuthContext);
  const [open, setOpen] = useState(false);
  const [signingOut, setSigningOut] = useState(false);
  const menuRef = useRef<HTMLDivElement>(null);

  useEffect(() => {
    if (open) {
      menuRef.current?.focus();
    }
  }, [open]);

  const onMenuKeyDown = (event: KeyboardEvent<HTMLDivElement>) => {
    if (event.key === 'Escape') {
      setOpen(false);
    }
  };

  const onSignOut = () => {
    if (signingOut || !canLeaveCurrentScreen()) {
      return;
    }

    setSigningOut(true);
    logout()
      .then(() => {
        setOpen(false);
        signOut();
      })
      .catch(() => {
        // A failed logout leaves the session intact; drop the busy state so the user can retry.
        setSigningOut(false);
      });
  };

  const label = username ?? 'Account';

  return (
    <div className="ctv-connect">
      <button
        aria-expanded={open}
        className="ctv-connect-button"
        onClick={() => setOpen((current) => !current)}
        type="button"
      >
        <UserRound aria-hidden="true" size={15} />
        {label}
        <ChevronDown aria-hidden="true" size={13} />
      </button>

      {open && (
        <>
          <button
            aria-label="Close account menu"
            className="ctv-connect-dismiss"
            onClick={() => setOpen(false)}
            type="button"
          />
          <div
            aria-label="Account"
            className="ctv-connect-menu"
            onKeyDown={onMenuKeyDown}
            ref={menuRef}
            role="dialog"
            tabIndex={-1}
          >
            <div className="ctv-connect-header">
              <strong>{label}</strong>
              <span>Signed in</span>
            </div>
            <button
              className="ctv-auth-banner-link ctv-press"
              disabled={signingOut}
              onClick={onSignOut}
              style={{ alignItems: 'center', display: 'inline-flex', gap: 6, margin: '4px 0 0' }}
              type="button"
            >
              <LogOut aria-hidden="true" size={14} />
              Sign out
            </button>
          </div>
        </>
      )}
    </div>
  );
}