// 기본 전화번호 마스킹 함수
function maskPhoneNumber(phone, type = 'middle') {
    // 숫자만 추출
    const numbers = phone.replace(/\D/g, '');
    
    // 국가번호 처리
    let cleanNumber = numbers;
    if (numbers.startsWith('82')) {
        cleanNumber = '0' + numbers.substring(2);
    }
    
    // 전화번호 유형 판별 및 마스킹
    if (cleanNumber.startsWith('010') || cleanNumber.startsWith('011') || 
        cleanNumber.startsWith('016') || cleanNumber.startsWith('017') || 
        cleanNumber.startsWith('018') || cleanNumber.startsWith('019')) {
        return maskMobilePhone(cleanNumber, type);
    } else if (cleanNumber.startsWith('02')) {
        return maskSeoulPhone(cleanNumber, type);
    } else if (cleanNumber.length === 10 || cleanNumber.length === 11) {
        return maskLocalPhone(cleanNumber, type);
    }
    
    return '올바르지 않은 전화번호 형식';
}

// 휴대폰 번호 마스킹
function maskMobilePhone(phone, type) {
    const part1 = phone.substring(0, 3);  // 010
    const part2 = phone.substring(3, 7);  // 1234
    const part3 = phone.substring(7);     // 5678
    
    switch(type) {
        case 'middle':
            return `${part1}-****-${part3}`;
        case 'partial':
            return `${part1}-${part2.substring(0,2)}**-${part3.substring(0,2)}**`;
        case 'end':
            return `${part1}-${part2}-****`;
        case 'heavy':
            return `${part1.substring(0,2)}*-****-****`;
        default:
            return `${part1}-****-${part3}`;
    }
}

// 서울 지역번호 마스킹
function maskSeoulPhone(phone, type) {
    if (phone.length === 9) {
        const part1 = '02';
        const part2 = phone.substring(2, 5);
        const part3 = phone.substring(5);
        
        switch(type) {
            case 'middle':
                return `${part1}-***-${part3}`;
            case 'partial':
                return `${part1}-${part2.substring(0,1)}**-${part3.substring(0,2)}**`;
            case 'end':
                return `${part1}-${part2}-****`;
            case 'heavy':
                return `02-****-****`;
            default:
                return `${part1}-***-${part3}`;
        }
    } else if (phone.length === 10) {
        const part1 = '02';
        const part2 = phone.substring(2, 6);
        const part3 = phone.substring(6);
        
        switch(type) {
            case 'middle':
                return `${part1}-****-${part3}`;
            case 'partial':
                return `${part1}-${part2.substring(0,2)}**-${part3.substring(0,2)}**`;
            case 'end':
                return `${part1}-${part2}-****`;
            case 'heavy':
                return `02-****-****`;
            default:
                return `${part1}-****-${part3}`;
        }
    }
    return '올바르지 않은 서울 지역번호';
}

// 지역번호 마스킹
function maskLocalPhone(phone, type) {
    if (phone.length === 10) {
        const part1 = phone.substring(0, 3);
        const part2 = phone.substring(3, 6);
        const part3 = phone.substring(6);
        
        switch(type) {
            case 'middle':
                return `${part1}-***-${part3}`;
            case 'partial':
                return `${part1}-${part2.substring(0,1)}**-${part3.substring(0,2)}**`;
            case 'end':
                return `${part1}-${part2}-****`;
            case 'heavy':
                return `${part1}-****-****`;
            default:
                return `${part1}-***-${part3}`;
        }
    } else if (phone.length === 11) {
        const part1 = phone.substring(0, 3);
        const part2 = phone.substring(3, 7);
        const part3 = phone.substring(7);
        
        switch(type) {
            case 'middle':
                return `${part1}-****-${part3}`;
            case 'partial':
                return `${part1}-${part2.substring(0,2)}**-${part3.substring(0,2)}**`;
            case 'end':
                return `${part1}-${part2}-****`;
            case 'heavy':
                return `${part1}-****-****`;
            default:
                return `${part1}-****-${part3}`;
        }
    }
    return '올바르지 않은 지역번호';
}

// 배열의 전화번호들을 일괄 마스킹
function maskPhoneArray(phoneArray, type = 'middle') {
    return phoneArray.map(phone => maskPhoneNumber(phone, type));
}

// 텍스트에서 전화번호를 찾아서 마스킹
function maskPhoneInText(text, type = 'middle') {
    const phoneRegex = /(\+?82-?)?0\d{1,2}-?\d{3,4}-?\d{4}/g;
    return text.replace(phoneRegex, (match) => maskPhoneNumber(match, type));
}