Coverage Summary for Class: InnLegalGenerator (ru.eda.plgn.bizgen.core.generator.impl)

 package ru.eda.plgn.bizgen.core.generator.impl
 
 import ru.eda.plgn.bizgen.core.generator.GeneratorResult
 import ru.eda.plgn.bizgen.core.generator.GeneratorResultWithEscape
 import ru.eda.plgn.bizgen.core.generator.GeneratorStr
 import kotlin.random.Random
 
 /**
  * ИНН Генератор для ФЛ.
  *
  * **See Also:**
  * [Идентификационный номер налогоплательщика](https://ru.wikipedia.org/wiki/%D0%98%D0%B4%D0%B5%D0%BD%D1%82%D0%B8%D1%84%D0%B8%D0%BA%D0%B0%D1%86%D0%B8%D0%BE%D0%BD%D0%BD%D1%8B%D0%B9_%D0%BD%D0%BE%D0%BC%D0%B5%D1%80_%D0%BD%D0%B0%D0%BB%D0%BE%D0%B3%D0%BE%D0%BF%D0%BB%D0%B0%D1%82%D0%B5%D0%BB%D1%8C%D1%89%D0%B8%D0%BA%D0%B0)
  */
 class InnIndividualGenerator : GeneratorStr {
   override val uniqueDistance: Int = 130
 
   override fun generate(): GeneratorResult<String> = GeneratorResultWithEscape(data = InnGeneratorBase.randomIndividualInn())
 }
 
 /**
  * ИНН Генератор для ЮЛ.
  *
  * **See Also:**
  * [Идентификационный номер налогоплательщика](https://ru.wikipedia.org/wiki/%D0%98%D0%B4%D0%B5%D0%BD%D1%82%D0%B8%D1%84%D0%B8%D0%BA%D0%B0%D1%86%D0%B8%D0%BE%D0%BD%D0%BD%D1%8B%D0%B9_%D0%BD%D0%BE%D0%BC%D0%B5%D1%80_%D0%BD%D0%B0%D0%BB%D0%BE%D0%B3%D0%BE%D0%BF%D0%BB%D0%B0%D1%82%D0%B5%D0%BB%D1%8C%D1%89%D0%B8%D0%BA%D0%B0)
  */
 class InnLegalGenerator : GeneratorStr {
   override val uniqueDistance: Int = 130
 
   override fun generate(): GeneratorResult<String> = GeneratorResultWithEscape(data = InnGeneratorBase.randomLegalInn())
 }
 
 /**
  * Базовая реализация ИНН Генератора.
  *
  * @author Dmitry_Emelyanenko
  */
 private object InnGeneratorBase {
   private const val MIN_REGION = 1
   private const val MAX_REGION = 99
 
   private val P10 = intArrayOf(2, 4, 10, 3, 5, 9, 4, 6, 8)
   private val P11 = intArrayOf(7, 2, 4, 10, 3, 5, 9, 4, 6, 8)
   private val P12 = intArrayOf(3, 7, 2, 4, 10, 3, 5, 9, 4, 6, 8)
 
   private enum class InnType {
     LEGAL,
     INDIVIDUAL
   }
 
   /** ИНН ЮЛ. */
   fun randomLegalInn(): String = generateInn(InnType.LEGAL)
 
   /** ИНН ФЛ. */
   fun randomIndividualInn(): String = generateInn(InnType.INDIVIDUAL)
 
   private fun generateInn(type: InnType): String {
     val random = Random.Default
     val region = generateRegion(random)
     val sequence = generateSequence(type, random)
 
     val baseInn = region + sequence
     return baseInn + calculateCheckDigits(baseInn)
   }
 
   private fun generateRegion(random: Random): String {
     return random.nextInt(MIN_REGION, MAX_REGION).toString().padStart(2, '0')
   }
 
   private fun generateSequence(type: InnType, random: Random): String {
     return when (type) {
       InnType.LEGAL -> random.nextInt(1_000_000, 10_000_000).toString()
       InnType.INDIVIDUAL -> random.nextInt(10_000_000, 100_000_000).toString()
     }
   }
 
   private fun calculateCheckDigits(baseInn: String): String {
     return when (baseInn.length) {
       9 -> calculateCheckDigit(P10, baseInn)
       10 -> {
         val firstDigit = calculateCheckDigit(P11, baseInn)
         val secondDigit = calculateCheckDigit(P12, baseInn + firstDigit)
         firstDigit + secondDigit
       }
 
       else -> throw IllegalArgumentException("Invalid base INN length: ${baseInn.length}. Available values: 9 or 10")
     }
   }
 
   private fun calculateCheckDigit(weights: IntArray, digits: String): String {
     require(digits.length == weights.size) { "Digits length must match weights size" }
 
     val sum = digits.foldIndexed(0) { index, acc, c ->
       acc + weights[index] * (c - '0')
     }
 
     return ((sum % 11) % 10).toString()
   }
 }