/**
 * Escapes a string to AO1 escape codes.
 * @param {string} estring the string to be escaped
 */
export function escapeChat(estring: string): string {
    return estring
        .replaceAll('#', '<num>')
        .replaceAll('&', '<and>')
        .replaceAll('%', '<percent>')
        .replaceAll('$', '<dollar>');
}

/**
 * Unescapes a string to AO1 escape codes.
 * @param {string} estring the string to be unescaped
 */
export function unescapeChat(estring: string): string {
    return estring
        .replaceAll('<num>', '#')
        .replaceAll('<and>', '&')
        .replaceAll('<percent>', '%')
        .replaceAll('<dollar>', '$');
}

/**
 * Escapes a string to be HTML-safe.
 *
 * XXX: This is unnecessary if we use `createTextNode` instead!
 * @param {string} unsafe an unsanitized string
 */
export function safeTags(unsafe: string): string {
    if (unsafe) {
        return unsafe
            .replaceAll('>', '＞')
            .replaceAll('<', '＜');
    }
    return '';
}

/**
 * Decodes text on client side.
 * @param {string} estring the string to be decoded
 */
export function decodeChat(estring: string): string {
    // Source: https://stackoverflow.com/questions/7885096/how-do-i-decode-a-string-with-escaped-unicode
    return estring.replace(/\\u([\d\w]{1,})/gi, (match, group) => String.fromCharCode(parseInt(group, 16)));
}

/**
 * XXX: a nasty hack made by gameboyprinter.
 * @param {string} msg chat message to prepare for display
 */
export function prepChat(msg: string): string {
    // TODO: make this less awful
    return safeTags(unescapeChat(decodeChat(msg)));
}