import stripAnsi from 'strip-ansi';
import {eastAsianWidth} from 'get-east-asian-width';
import emojiRegex from 'emoji-regex';

const segmenter = new Intl.Segmenter();

export default function stringWidth(string, options = {}) {
	if (typeof string !== 'string' || string.length === 0) {
		return 0;
	}

	const {
		ambiguousIsNarrow = true,
		countAnsiEscapeCodes = false,
	} = options;

	if (!countAnsiEscapeCodes) {
		string = stripAnsi(string);
	}

	if (string.length === 0) {
		return 0;
	}

	let width = 0;
	const eastAsianWidthOptions = {ambiguousAsWide: !ambiguousIsNarrow};

	for (const {segment: character} of segmenter.segment(string)) {
		const codePoint = character.codePointAt(0);

		// Ignore control characters
		if (codePoint <= 0x1F || (codePoint >= 0x7F && codePoint <= 0x9F)) {
			continue;
		}

		// Ignore combining characters
		if (codePoint >= 0x3_00 && codePoint <= 0x3_6F) {
			continue;
		}

		if (emojiRegex().test(character)) {
			width += 2;
			continue;
		}

		width += eastAsianWidth(codePoint, eastAsianWidthOptions);
	}

	return width;
}