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

import { Button, ButtonProps } from '../Button';

export interface Props extends ButtonProps {
  /** A function that returns text to be copied */
  getText(): string;
  /** Callback when the text has been successfully copied */
  onClipboardCopy?(copiedText: string): void;
  /** Callback when there was an error copying the text */
  onClipboardError?(copiedText: string, error: unknown): void;
}

const SHOW_SUCCESS_DURATION = 2 * 1000;

export function ClipboardButton({
  onClipboardCopy,
  onClipboardError,
  children,
  getText,
  icon,
  variant,
  ...buttonProps
}: Props) {
  const [showCopySuccess, setShowCopySuccess] = useState(false);

  useEffect(() => {
    let timeoutId: NodeJS.Timeout;

    if (showCopySuccess) {
      timeoutId = setTimeout(() => {
        setShowCopySuccess(false);
      }, SHOW_SUCCESS_DURATION);
    }

    return () => {
      window.clearTimeout(timeoutId);
    };
  }, [showCopySuccess]);

  const buttonRef = useRef<null | HTMLButtonElement>(null);
  const copyTextCallback = useCallback(async () => {
    const textToCopy = getText();

    try {
      await copyText(textToCopy, buttonRef);
      setShowCopySuccess(true);
      onClipboardCopy?.(textToCopy);
    } catch (e) {
      onClipboardError?.(textToCopy, e);
    }
  }, [getText, onClipboardCopy, onClipboardError]);

  return (
    <Button
      onClick={copyTextCallback}
      icon={showCopySuccess ? 'check' : icon}
      variant={showCopySuccess ? 'success' : variant}
      aria-label={showCopySuccess ? 'Copied' : undefined}
      {...buttonProps}
      ref={buttonRef}
    >
      {children}
    </Button>
  );
}

const copyText = async (text: string, buttonRef: React.MutableRefObject<HTMLButtonElement | null>) => {
  if (navigator.clipboard && window.isSecureContext) {
    return navigator.clipboard.writeText(text);
  } else {
    // Use a fallback method for browsers/contexts that don't support the Clipboard API.
    // See https://web.dev/async-clipboard/#feature-detection.
    const input = document.createElement('input');
    // Normally we'd append this to the body. However if we're inside a focus manager
    // from react-aria, we can't focus anything outside of the managed area.
    // Instead, let's append it to the button. Then we're guaranteed to be able to focus + copy.
    buttonRef.current?.appendChild(input);
    input.value = text;
    input.focus();
    input.select();
    document.execCommand('copy');
    input.remove();
  }
};