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package java.util

import locales.LocaleRegistry
import scala.collection.{Map => SMap, Set => SSet}
import scala.collection.JavaConverters._
import locales.cldr.{CurrencyDataFractionsInfo, CurrencyType}
import locales.cldr.data.currencydata

object Currency {
  private val countryCodeToCurrencyCodeMap: SMap[String, String] = currencydata.regions.map{ r =>
    r.countryCode -> (r.currencies.find{ _.to.isEmpty } orElse r.currencies.headOption).map{ _.currencyCode }.get
  }.toMap

  private val all: SSet[Currency] = currencydata.currencyTypes.map{ currencyType: CurrencyType =>
    val fractions: CurrencyDataFractionsInfo = (
      currencydata.fractions.find{ _.currencyCode == currencyType.currencyCode } orElse
      currencydata.fractions.find{ _.currencyCode == "DEFAULT" }
    ).get

    val numericCode: Int =
      currencydata.numericCodes.find{ _.currencyCode == currencyType.currencyCode }.map{ _.numericCode }.getOrElse(0)

    Currency(currencyType.currencyCode, numericCode, fractions.digits, currencyType.currencyName, None)
  }.toSet

  require(all.nonEmpty, "No currency data?")

  private val currencyCodeMap: SMap[String, Currency] = all.toSeq.groupBy{ _.getCurrencyCode }.map{
    case (currencyCode: String, matches: Seq[Currency]) => currencyCode -> matches.head
  }

  def getAvailableCurrencies(): java.util.Set[Currency] = all.asJava

  // NullPointerException - if locale or its country code is null
  // IllegalArgumentException - if the country of the given locale is not a supported ISO 3166 country code.
  def getInstance(locale: Locale): Currency = {
    if (locale.getCountry == null || locale.getCountry.isEmpty) throw new NullPointerException

    countryCodeToCurrencyCodeMap.get(locale.getCountry).flatMap{ currencyCodeMap.get }.getOrElse(throw new IllegalArgumentException)
  }

  def getInstance(currencyCode: String): Currency = currencyCodeMap(currencyCode)
}

final case class Currency private (currencyCode: String,
    numericCode: Int,
    fractionDigits: Int,
    defaultName: String,
    currencyLocale: Option[Locale] = None) {
  import Currency._

  def defaultLocale: Locale = currencyLocale.getOrElse(Locale.getDefault)

  // Gets the ISO 4217 currency code of this currency.
  def getCurrencyCode(): String = currencyCode

  // Gets the default number of fraction digits used with this currency.
  def getDefaultFractionDigits(): Int = fractionDigits

  // Gets the name that is suitable for displaying this currency for the default DISPLAY locale.
  def getDisplayName(): String = getDisplayName(defaultLocale)

  // Gets the name that is suitable for displaying this currency for the specified locale.
  def getDisplayName(locale: Locale): String = {
    LocaleRegistry.ldml(locale).flatMap { ldml =>
      ldml.getNumberCurrencyDescription(currencyCode).find{ _.count.isEmpty }.map{ _.name }
    }.getOrElse(currencyCode)
  }

  // Returns the ISO 4217 numeric code of this currency.
  def getNumericCode(): Int = numericCode

  // Gets the symbol of this currency for the default DISPLAY locale.
  def getSymbol(): String = getSymbol(defaultLocale)

  // Gets the symbol of this currency for the specified locale.
  def getSymbol(locale: Locale): String = {
    LocaleRegistry.ldml(locale).flatMap { ldml =>
      val symbols = ldml.getNumberCurrencySymbol(currencyCode)

      // TODO: might need a more sophisticated symbol-matcher
      // The tests from the JVM indicate we prefer the "wide" over "narrow" symbol
      (
        symbols.find{ _.alt.isEmpty } orElse
        symbols.find{ _.alt.exists{ _ == "narrow" } }
      ).map{ _.symbol }
    }.getOrElse(currencyCode)
  }

  // Returns the ISO 4217 currency code of this currency.
  override def toString(): String = currencyCode
}