# All files / utils validator.js

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     // utils/validator.js - 유효성 검사 유틸리티

    const { handleValidationError } = require('./errorHandler');

    /**
     * 필수 필드 검사
     */
    const required = (value, fieldName) => {
      if (value === undefined || value === null || value === '') {
        handleValidationError(fieldName, value, 'required');
      }
      return true;
    };

    /**
     * 문자열 길이 검사
     */
    const stringLength = (value, fieldName, min = 0, max = Infinity) => {
      if (typeof value !== 'string') {
        handleValidationError(fieldName, value, 'string type');
      }
      if (value.length < min || value.length > max) {
        handleValidationError(fieldName, value, `length between ${min} and ${max}`);
      }
      return true;
    };

    /**
     * 숫자 범위 검사
     */
    const numberRange = (value, fieldName, min = -Infinity, max = Infinity) => {
      const num = parseFloat(value);
      if (isNaN(num)) {
        handleValidationError(fieldName, value, 'number type');
      }
      if (num < min || num > max) {
        handleValidationError(fieldName, value, `number between ${min} and ${max}`);
      }
      return true;
    };

    /**
     * 정수 검사
     */
    const integer = (value, fieldName) => {
      const num = parseInt(value);
      if (isNaN(num) || num.toString() !== value.toString()) {
        handleValidationError(fieldName, value, 'integer');
      }
      return true;
    };

    /**
     * 이메일 형식 검사
     */
    const email = (value, fieldName) => {
      const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
      if (!emailRegex.test(value)) {
        handleValidationError(fieldName, value, 'valid email format');
      }
      return true;
    };

    /**
     * 날짜 형식 검사 (YYYY-MM-DD)
     */
    const dateFormat = (value, fieldName) => {
      const dateRegex = /^\d{4}-\d{2}-\d{2}$/;
      if (!dateRegex.test(value)) {
        handleValidationError(fieldName, value, 'YYYY-MM-DD format');
      }

      const date = new Date(value);
      if (isNaN(date.getTime())) {
        handleValidationError(fieldName, value, 'valid date');
      }
      return true;
    };

    /**
     * 시간 형식 검사 (HH:MM)
     */
    const timeFormat = (value, fieldName) => {
      const timeRegex = /^([0-1]?[0-9]|2[0-3]):[0-5][0-9]$/;
      if (!timeRegex.test(value)) {
        handleValidationError(fieldName, value, 'HH:MM format');
      }
      return true;
    };

    /**
     * 열거형 값 검사
     */
    const enumValue = (value, fieldName, allowedValues) => {
      if (!allowedValues.includes(value)) {
        handleValidationError(fieldName, value, `one of: ${allowedValues.join(', ')}`);
      }
      return true;
    };

    /**
     * 배열 검사
     */
    const arrayType = (value, fieldName, minLength = 0, maxLength = Infinity) => {
      if (!Array.isArray(value)) {
        handleValidationError(fieldName, value, 'array type');
      }
      if (value.length < minLength || value.length > maxLength) {
        handleValidationError(fieldName, value, `array length between ${minLength} and ${maxLength}`);
      }
      return true;
    };

    /**
     * 객체 검사
     */
    const objectType = (value, fieldName) => {
      if (typeof value !== 'object' || value === null || Array.isArray(value)) {
        handleValidationError(fieldName, value, 'object type');
      }
      return true;
    };

    /**
     * 비밀번호 강도 검사
     */
    const passwordStrength = (value, fieldName) => {
      if (typeof value !== 'string') {
        handleValidationError(fieldName, value, 'string type');
      }

      const minLength = 8;
      const hasUpperCase = /[A-Z]/.test(value);
      const hasLowerCase = /[a-z]/.test(value);
      const hasNumbers = /\d/.test(value);
      const hasSpecialChar = /[!@#$%^&*(),.?":{}|<>]/.test(value);

      if (value.length < minLength) {
        handleValidationError(fieldName, value, `minimum ${minLength} characters`);
      }

      const strengthChecks = [hasUpperCase, hasLowerCase, hasNumbers, hasSpecialChar];
      const passedChecks = strengthChecks.filter(Boolean).length;

      if (passedChecks < 3) {
        handleValidationError(fieldName, value, 'at least 3 of: uppercase, lowercase, numbers, special characters');
      }

      return true;
    };

    /**
     * 스키마 기반 유효성 검사
     */
    const validateSchema = (data, schema) => {
      const errors = [];

      for (const [field, rules] of Object.entries(schema)) {
        const value = data[field];

        try {
          // 필수 필드 검사
          if (rules.required) {
            required(value, field);
          }

          // 값이 없고 필수가 아니면 다른 검사 스킵
          if ((value === undefined || value === null || value === '') && !rules.required) {
            continue;
          }

          // 타입별 검사
          if (rules.type === 'string' && rules.minLength !== undefined && rules.maxLength !== undefined) {
            stringLength(value, field, rules.minLength, rules.maxLength);
          }

          if (rules.type === 'number' && rules.min !== undefined && rules.max !== undefined) {
            numberRange(value, field, rules.min, rules.max);
          }

          if (rules.type === 'integer') {
            integer(value, field);
          }

          if (rules.type === 'email') {
            email(value, field);
          }

          if (rules.type === 'date') {
            dateFormat(value, field);
          }

          if (rules.type === 'time') {
            timeFormat(value, field);
          }

          if (rules.type === 'array') {
            arrayType(value, field, rules.minLength, rules.maxLength);
          }

          if (rules.type === 'object') {
            objectType(value, field);
          }

          if (rules.enum) {
            enumValue(value, field, rules.enum);
          }

          if (rules.password) {
            passwordStrength(value, field);
          }

          // 커스텀 검증 함수
          if (rules.custom && typeof rules.custom === 'function') {
            rules.custom(value, field);
          }

        } catch (error) {
          errors.push({
            field,
            value,
            message: error.message
          });
        }
      }

      if (errors.length > 0) {
        const errorMessage = errors.map(e => `${e.field}: ${e.message}`).join(', ');
        handleValidationError('validation', 'multiple fields', errorMessage);
      }

      return true;
    };

    /**
     * 일반적인 스키마 정의들
     */
    const schemas = {
      // 사용자 생성
      createUser: {
        username: { required: true, type: 'string', minLength: 3, maxLength: 50 },
        password: { required: true, password: true },
        name: { required: true, type: 'string', minLength: 2, maxLength: 100 },
        access_level: { required: true, enum: ['user', 'admin', 'system'] },
        worker_id: { type: 'integer' }
      },

      // 사용자 업데이트
      updateUser: {
        name: { type: 'string', minLength: 2, maxLength: 100 },
        access_level: { enum: ['user', 'admin', 'system'] },
        worker_id: { type: 'integer' }
      },

      // 비밀번호 변경
      changePassword: {
        currentPassword: { required: true, type: 'string' },
        newPassword: { required: true, password: true }
      },

      // 일일 작업 보고서 생성 (배열 형태)
      createDailyWorkReport: {
        report_date: { required: true, type: 'date' },
        worker_id: { required: true, type: 'integer' },
        work_entries: { required: true, type: 'array' },
        created_by: { type: 'integer' }
      },

      // 프로젝트 생성
      createProject: {
        project_name: { required: true, type: 'string', minLength: 2, maxLength: 200 },
        description: { type: 'string', maxLength: 1000 },
        start_date: { type: 'date' },
        end_date: { type: 'date' }
      },

      // 작업자 생성
      createWorker: {
        worker_name: { required: true, type: 'string', minLength: 2, maxLength: 100 },
        position: { type: 'string', maxLength: 100 },
        department: { type: 'string', maxLength: 100 },
        phone: { type: 'string', maxLength: 20 },
        email: { type: 'email' }
      }
    };

    module.exports = {
      // 개별 검증 함수들
      required,
      stringLength,
      numberRange,
      integer,
      email,
      dateFormat,
      timeFormat,
      enumValue,
      arrayType,
      objectType,
      passwordStrength,

      // 스키마 검증
      validateSchema,
      schemas
    };