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import Type from './type';

const reEscape = /[&<>'"]/g;
const reUnescape = /&(?:amp|#38|lt|#60|gt|#62|apos|#39|quot|#34);/g;

const escapeEntities = {
	'&': '&amp;',
	'<': '&lt;',
	'>': '&gt;',
	"'": '&#39;',
	'"': '&quot;',
};

const unescapeEntities = {
	'&amp;': '&',
	'&#38;': '&',
	'&lt;': '<',
	'&#60;': '<',
	'&gt;': '>',
	'&#62;': '>',
	'&apos;': "'",
	'&#39;': "'",
	'&quot;': '"',
	'&#34;': '"',
};

/**
 * @memberOf BX
 */
export default class Text
{
	/**
	 * Encodes all unsafe entities
	 * @param {string} value
	 * @return {string}
	 */
	static encode(value: string): string
	{
		if (Type.isString(value))
		{
			return value.replace(reEscape, item => escapeEntities[item]);
		}

		return value;
	}

	/**
	 * Decodes all encoded entities
	 * @param {string} value
	 * @return {string}
	 */
	static decode(value: string): string
	{
		if (Type.isString(value))
		{
			return value.replace(reUnescape, item => unescapeEntities[item]);
		}

		return value;
	}

	static getRandom(length = 8)
	{
		// eslint-disable-next-line
		return [...Array(length)].map(() => (~~(Math.random() * 36)).toString(36)).join('');
	}

	static toNumber(value: any): number
	{
		const parsedValue = Number.parseFloat(value);

		if (Type.isNumber(parsedValue))
		{
			return parsedValue;
		}

		return 0;
	}

	static toInteger(value: any): number
	{
		return Text.toNumber(Number.parseInt(value, 10));
	}

	static toBoolean(value: any, trueValues = []): boolean
	{
		const transformedValue = Type.isString(value) ? value.toLowerCase() : value;
		return ['true', 'y', '1', 1, true, ...trueValues].includes(transformedValue);
	}

	static toCamelCase(str: string)
	{
		if (!Type.isStringFilled(str))
		{
			return str;
		}

		const regex = /[-_\s]+(.)?/g;
		if (!regex.test(str))
		{
			return str.match(/^[A-Z]+$/) ? str.toLowerCase() : str[0].toLowerCase() + str.slice(1);
		}

		str = str.toLowerCase();
		str = str.replace(regex, function(match, letter) {
			return letter ? letter.toUpperCase() : '';
		});

		return str[0].toLowerCase() + str.substr(1);
	}

	static toPascalCase(str: string)
	{
		if (!Type.isStringFilled(str))
		{
			return str;
		}

		return this.capitalize(this.toCamelCase(str));
	}

	static toKebabCase(str: string)
	{
		if (!Type.isStringFilled(str))
		{
			return str;
		}

		const matches = str.match(/[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g);
		if (!matches)
		{
			return str;
		}

		return matches.map(x => x.toLowerCase()).join('-');
	}

	static capitalize(str: string)
	{
		if (!Type.isStringFilled(str))
		{
			return str;
		}

		return str[0].toUpperCase() + str.substr(1);
	}
}