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import { useRef } from 'react';

export function useA11yAnnouncer() {
  const timer = useRef<number | null>(null);

  const announce = async (message: string) => {
    const style = `border: 0; padding: 0; margin: 0; position: absolute !important;
      height: 1px; width: 1px; overflow: hidden;
      clip: rect(1px 1px 1px 1px); clip: rect(1px, 1px, 1px, 1px); clip-path: inset(50%); white-space: nowrap;`.replaceAll(
      /\n/g,
      ''
    );
    const appendAndAnnounce = async (element: Element, message: string) => {
      return new Promise(resolve => {
        if (!element.querySelector("[name='p_announceForAccessibility']")) {
          const div = document.createElement('div');
          div.setAttribute('name', 'div_announceForAccessibility');
          div.setAttribute('style', style);
          div.innerHTML = '<p aria-live="polite" name="p_announceForAccessibility"></p>';
          element.appendChild(div);
        }
        const pElement = element.querySelector<HTMLParagraphElement>("[name='p_announceForAccessibility']");

        if (!pElement) {
          return;
        }

        pElement.innerText = '';
        setTimeout(() => {
          pElement.innerText = message;
          resolve(void 0);
        }, 200);
      });
    };
    const announceMessages = async () => {
      if (typeof window !== 'undefined') {
        const bodyElement = document.body;
        const dialogElements = document.body.querySelectorAll<HTMLDialogElement>(
          '[role="dialog"][aria-modal="true"], dialog'
        );
        await appendAndAnnounce(bodyElement, message);

        dialogElements.forEach(element => {
          appendAndAnnounce(element, message);
        });
      }
    };

    await announceMessages();

    timer.current = window.setTimeout(removeAnnounce, 1000);
  };

  const removeAnnounce = () => {
    if (typeof window !== 'undefined') {
      const divElements = document.body.querySelectorAll<HTMLDivElement>("[name='div_announceForAccessibility']");

      if (!divElements || !timer.current) {
        return;
      }

      divElements.forEach(element => {
        element.parentNode?.removeChild(element);
      });

      clearTimeout(timer.current);
      timer.current = null;
    }
  };
  return [announce, removeAnnounce] as const;
}

interface FocusManagerProps {
  isOpen: boolean;
  containerId: string;
  children: React.ReactNode;
}

const FocusManager = ({ 
  isOpen, 
  containerId, 
  children 
}: FocusManagerProps) => {
  const previousFocusRef = useRef<HTMLElement | null>(null);

  useEffect(() => {
    const container = document.getElementById(containerId);
    
    if (isOpen && container) {
      // 현재 포커스 저장
      previousFocusRef.current = document.activeElement as HTMLElement;
      
      // 포커스 이동 처리
      setTimeout(() => {
        const focusableElement = container.querySelector(
          'button, [href], input, select, textarea, [tabindex]:not([tabindex="-1"])'
        ) as HTMLElement;

        if (focusableElement) {
          focusableElement.focus();
        } else {
          container.setAttribute('tabindex', '-1');
          container.focus();
        }
      }, 500);
      
    } else if (!isOpen && container) {
      // 이전 포커스로 복귀
      setTimeout(() => {
        if (previousFocusRef.current && previousFocusRef.current !== document.body) {
          previousFocusRef.current.focus();
        }
      }, 500);
    }
  }, [isOpen, containerId]);

  return <>{children}</>;
};

export default FocusManager;

interface BottomSheetAccessibilityManagerProps {
  isOpen: boolean;
  bottomSheetId: string;
  children: React.ReactNode;
  initialFocusElementId?: string;
}

const BottomSheetAccessibilityManager = ({ 
  isOpen, 
  bottomSheetId, 
  children,
  initialFocusElementId 
}: BottomSheetAccessibilityManagerProps) => {
  const previousFocusRef = useRef<HTMLElement | null>(null);

  useEffect(() => {
    const bottomSheet = document.getElementById(bottomSheetId);
    
    if (isOpen && bottomSheet) {
      // 현재 포커스 저장
      previousFocusRef.current = document.activeElement as HTMLElement;
      
      // 형제 요소들 inert 처리
      const siblings = Array.from(bottomSheet.parentElement?.children || [])
        .filter(child => child !== bottomSheet);
      siblings.forEach(sibling => {
        sibling.setAttribute('inert', '');
      });

      // 포커스 이동 처리
      setTimeout(() => {
        // 페이지 로딩 시 자동 오픈이거나 이전 포커스가 없는 경우
        if (!previousFocusRef.current || previousFocusRef.current === document.body) {
          if (initialFocusElementId) {
            const initialFocusElement = document.getElementById(initialFocusElementId);
            if (initialFocusElement) {
              initialFocusElement.focus();
              return;
            }
          }
        }

        // 일반적인 포커스 이동 처리
        const focusableElement = bottomSheet.querySelector(
          'button, [href], input, select, textarea, [tabindex]:not([tabindex="-1"])'
        ) as HTMLElement;

        if (focusableElement) {
          focusableElement.focus();
        } else {
          bottomSheet.setAttribute('tabindex', '-1');
          bottomSheet.focus();
        }
      }, 500);
      
    } else if (!isOpen && bottomSheet) {
      // inert 속성 제거
      const siblings = Array.from(bottomSheet.parentElement?.children || [])
        .filter(child => child !== bottomSheet);
      siblings.forEach(sibling => {
        sibling.removeAttribute('inert');
      });

      // 이전 포커스로 복귀
      // 이전 포커스가 유효한 경우에만 포커스 이동
      setTimeout(() => {
        if (previousFocusRef.current && previousFocusRef.current !== document.body) {
          previousFocusRef.current.focus();
        }
      }, 500);
    }
  }, [isOpen, bottomSheetId, initialFocusElementId]);

  return <>{children}</>;
};

export default BottomSheetAccessibilityManager;