const MIN_DIGIT_CHAR_CODE = 48;
const MAX_DIGIT_CHAR_CODE = 57;
const WHITESPACE_CHAR_CODE = 32;
const TAB_CHAR_CODE = 9;
const DOT_CHAR_CODE = 46;

export function isDigit(charCode) {
    return charCode >= MIN_DIGIT_CHAR_CODE && charCode <= MAX_DIGIT_CHAR_CODE;
}

export function isNumber(string) {
    for (var i = 0; i < string.length; i++) {
        const charCode = string.charCodeAt(i);
        if (!isDigit(charCode)) {
            return false;
        }
    }
    return true;
}

export function hasOnly(string, char) {
    const charCode = char.charCodeAt(0);
    for (var i = 0; i < string.length; i++) {
        const aCharCode = string.charCodeAt(i);
        if (aCharCode != charCode) {
            return false;
        }
    }
    return true;
}

export function hasUpperCaseCharacterInMiddleOfWord(text) {
    var beginningOfWord = true;
    for (var i = 0; i < text.length; i++) {
        const character = text.charAt(i);
        if (character === ' ') {
            beginningOfWord = true;
        } else {
            if (!beginningOfWord && isNaN(character * 1) && character == character.toUpperCase() && character.toUpperCase() != character.toLowerCase()) {
                return true;
            }
            beginningOfWord = false;
        }
    }
    return false;
}

// Remove whitespace/dots + to uppercase
export function normalizedCharCodeArray(string) {
    string = string.toUpperCase();
    return charCodeArray(string).filter(charCode => charCode != WHITESPACE_CHAR_CODE && charCode != TAB_CHAR_CODE && charCode != DOT_CHAR_CODE);
}

export function charCodeArray(string) {
    const charCodes = [];
    for (var i = 0; i < string.length; i++) {
        charCodes.push(string.charCodeAt(i));
    }
    return charCodes;
}

export function removeLeadingWhitespaces(string) {
    while (string.charCodeAt(0) === WHITESPACE_CHAR_CODE) {
        string = string.substring(1, string.length);
    }
    return string;
}

export function removeTrailingWhitespaces(string) {
    while (string.charCodeAt(string.length - 1) === WHITESPACE_CHAR_CODE) {
        string = string.substring(0, string.length - 1);
    }
    return string;
}


export function prefixAfterWhitespace(prefix, string) {
    if (string.charCodeAt(0) == WHITESPACE_CHAR_CODE) {
        string = removeLeadingWhitespaces(string);
        return ' ' + prefix + string;
    } else {
        return prefix + string;
    }
}

export function suffixBeforeWhitespace(string, suffix) {
    if (string.charCodeAt(string.length - 1) == WHITESPACE_CHAR_CODE) {
        string = removeTrailingWhitespaces(string);
        return string + suffix + ' ';
    } else {
        return string + suffix;
    }
}

export function isListItemCharacter(string) {
    if (string.length > 1) {
        return false
    }
    const char = string.charAt(0);
    return char === '-' || char === '•' || char === '–';
}


export function isListItem(string) {
    return /^[\s]*[-•–][\s].*$/g.test(string);
}

export function isNumberedListItem(string) {
    return /^[\s]*[\d]*[\.][\s].*$/g.test(string);
}

export function wordMatch(string1, string2) {
    const words1 = new Set(string1.toUpperCase().split(' '));
    const words2 = new Set(string2.toUpperCase().split(' '));
    const intersection = new Set(
        [...words1].filter(x => words2.has(x)));
    return intersection.size / Math.max(words1.size, words2.size);
}