'use strict';

/**
 * Get the count of the longest repeating streak of
 * `character` in `value`.
 *
 * @example
 *   longestStreak('` foo `` bar `', '`') // 2
 *
 * @param {string} value - Content, coerced to string.
 * @param {string} character - Single character to look
 *   for.
 * @return {number} - Number of characters at the place
 *   where `character` occurs in its longest streak in
 *   `value`.
 * @throws {Error} - when `character` is not a single
 *   character.
 */
function longestStreak(value, character) {
    var count = 0;
    var maximum = 0;
    var index = -1;
    var length;

    value = String(value);
    length = value.length;

    if (typeof character !== 'string' || character.length !== 1) {
        throw new Error('Expected character');
    }

    while (++index < length) {
        if (value.charAt(index) === character) {
            count++;

            if (count > maximum) {
                maximum = count;
            }
        } else {
            count = 0;
        }
    }

    return maximum;
}

/*
 * Expose.
 */

module.exports = longestStreak;