import type { MaybePromise } from '../asyncs/MaybePromise';

let _copy: (s: any) => MaybePromise<void>;

// https://gist.github.com/rproenca/64781c6a1329b48a455b645d361a9aa3
function initCopy() {
	let textArea: HTMLTextAreaElement;

	function isIOS() {
		return navigator.userAgent.match(/ipad|iphone/i);
	}

	function createTextArea(text: string) {
		textArea = document.createElement('textArea') as HTMLTextAreaElement;
		textArea.value = text;
		document.body.appendChild(textArea);
	}

	function selectText() {
		let range: Range | undefined;
		let selection: Selection | null;

		if (isIOS()) {
			range = document.createRange();
			range.selectNodeContents(textArea);
			selection = window.getSelection();
			if (selection === null) {
				console.error(`no selection`);
				return;
			}
			selection.removeAllRanges();
			selection.addRange(range);
			textArea.setSelectionRange(0, 999999);
		} else {
			textArea.select();
		}
	}

	function copyToClipboard() {
		document.execCommand('copy');
		document.body.removeChild(textArea);
	}

	_copy = (text) => {
		createTextArea(text);
		selectText();
		copyToClipboard();
	};
}

/**
 * Write text to clipboard
 * @param content content
 */
export function copy(content: string): MaybePromise<void> {
	if (window.navigator?.clipboard?.writeText) {
		return window.navigator.clipboard.writeText(content);
	}
	if (!_copy) {
		initCopy();
	}
	return _copy(content);
}