import {useCallback, useEffect, useRef, useState} from 'react';

interface AdminWriteConfirmOptions {
  action: string;
  target: string;
}

interface PendingConfirm extends AdminWriteConfirmOptions {
  resolve: (confirmed: boolean) => void;
}

export function useAdminWriteConfirm() {
  const [pendingConfirm, setPendingConfirm] = useState<PendingConfirm | null>(null);
  const cancelButtonRef = useRef<HTMLButtonElement | null>(null);

  const confirmWrite = useCallback((options: AdminWriteConfirmOptions) => {
    return new Promise<boolean>((resolve) => {
      setPendingConfirm((current) => {
        if (current) {
          current.resolve(false);
        }
        return {...options, resolve};
      });
    });
  }, []);

  const closeConfirm = useCallback(
    (confirmed: boolean) => {
      const current = pendingConfirm;
      if (!current) {
        return;
      }
      setPendingConfirm(null);
      current.resolve(confirmed);
    },
    [pendingConfirm],
  );

  useEffect(() => {
    if (!pendingConfirm) {
      return;
    }

    cancelButtonRef.current?.focus();
    const handleKeyDown = (event: KeyboardEvent) => {
      if (event.key === 'Escape') {
        event.preventDefault();
        closeConfirm(false);
      }
    };
    window.addEventListener('keydown', handleKeyDown);
    return () => window.removeEventListener('keydown', handleKeyDown);
  }, [closeConfirm, pendingConfirm]);

  const confirmDialog = pendingConfirm ? (
    <div
      aria-modal="true"
      aria-labelledby="admin-write-confirm-title"
      className="admin-confirm-backdrop"
      role="dialog"
      onMouseDown={(event) => {
        if (event.target === event.currentTarget) {
          closeConfirm(false);
        }
      }}
    >
      <section className="admin-confirm-panel">
        <div className="admin-panel-heading">
          <h3 id="admin-write-confirm-title">确认操作</h3>
          <span>{pendingConfirm.action}</span>
        </div>
        <dl className="admin-info-list">
          <div>
            <dt>操作</dt>
            <dd>{pendingConfirm.action}</dd>
          </div>
          <div>
            <dt>对象</dt>
            <dd>{pendingConfirm.target}</dd>
          </div>
        </dl>
        <div className="admin-confirm-warning">该操作会立即影响线上数据</div>
        <div className="admin-confirm-actions">
          <button
            className="admin-secondary-button"
            ref={cancelButtonRef}
            type="button"
            onClick={() => closeConfirm(false)}
          >
            取消
          </button>
          <button
            className="admin-danger-button"
            type="button"
            onClick={() => closeConfirm(true)}
          >
            确认
          </button>
        </div>
      </section>
    </div>
  ) : null;

  return {
    confirmWrite,
    confirmDialog,
    isConfirming: pendingConfirm !== null,
  };
}