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package xyz.driver.core
import java.math.MathContext
import xyz.driver.core.time.{Time, TimeRange}
import xyz.driver.core.date.Date
import scala.reflect.ClassTag
import scala.util.Random
object generators {
private val random = new Random
import random._
private val DefaultMaxLength = 10
private val StringLetters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ ".toSet
private val NonAmbigiousCharacters = "abcdefghijkmnpqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ23456789".toSet
def nextToken(length: Int): String = List.fill(length)(oneOf(NonAmbigiousCharacters)).mkString
def nextInt(maxValue: Int, minValue: Int = 0): Int = random.nextInt(maxValue - minValue) + minValue
def nextBoolean(): Boolean = random.nextBoolean()
def nextDouble(): Double = random.nextDouble()
def nextId[T](): Id[T] = Id[T](nextUuid().toString)
def nextId[T](maxLength: Int): Id[T] = Id[T](nextString(maxLength))
def nextNumericId[T](): Id[T] = Id[T](nextLong.abs.toString)
def nextNumericId[T](maxValue: Int): Id[T] = Id[T](nextInt(maxValue).toString)
def nextName[T](maxLength: Int = DefaultMaxLength): Name[T] = Name[T](nextString(maxLength))
def nextUuid() = java.util.UUID.randomUUID
def nextRevision[T]() = Revision[T](nextUuid().toString)
def nextString(maxLength: Int = DefaultMaxLength): String =
(oneOf[Char](StringLetters) +: arrayOf(oneOf[Char](StringLetters), maxLength - 1)).mkString
def nextOption[T](value: => T): Option[T] = if (nextBoolean()) Option(value) else None
def nextPair[L, R](left: => L, right: => R): (L, R) = (left, right)
def nextTriad[F, S, T](first: => F, second: => S, third: => T): (F, S, T) = (first, second, third)
def nextTime(): Time = Time(math.abs(nextLong() % System.currentTimeMillis))
def nextTimeRange(): TimeRange = {
val oneTime = nextTime()
val anotherTime = nextTime()
TimeRange(Time(scala.math.min(oneTime.millis, anotherTime.millis)),
Time(scala.math.max(oneTime.millis, anotherTime.millis)))
}
def nextDate(): Date = nextTime().toDate(java.util.TimeZone.getTimeZone("UTC"))
def nextBigDecimal(multiplier: Double = 1000000.00, precision: Int = 2): BigDecimal =
BigDecimal(multiplier * nextDouble, new MathContext(precision))
def oneOf[T](items: T*): T = oneOf(items.toSet)
def oneOf[T](items: Set[T]): T = items.toSeq(nextInt(items.size))
def arrayOf[T: ClassTag](generator: => T, maxLength: Int = DefaultMaxLength, minLength: Int = 0): Array[T] =
Array.fill(nextInt(maxLength, minLength))(generator)
def seqOf[T](generator: => T, maxLength: Int = DefaultMaxLength, minLength: Int = 0): Seq[T] =
Seq.fill(nextInt(maxLength, minLength))(generator)
def vectorOf[T](generator: => T, maxLength: Int = DefaultMaxLength, minLength: Int = 0): Vector[T] =
Vector.fill(nextInt(maxLength, minLength))(generator)
def listOf[T](generator: => T, maxLength: Int = DefaultMaxLength, minLength: Int = 0): List[T] =
List.fill(nextInt(maxLength, minLength))(generator)
def setOf[T](generator: => T, maxLength: Int = DefaultMaxLength, minLength: Int = 0): Set[T] =
seqOf(generator, maxLength, minLength).toSet
def mapOf[K, V](keyGenerator: => K,
valueGenerator: => V,
maxLength: Int = DefaultMaxLength,
minLength: Int = 0): Map[K, V] =
seqOf(nextPair(keyGenerator, valueGenerator), maxLength, minLength).toMap
}
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