Add more functinos for money extension and fixed the curreny and object currency and default std money value and more

src/main/kotlin/com/cubetiqs/money/Money.kt

@@ -12,7 +12,7 @@ open class Money(
 
     // not imply with exchange rate yet
     override fun StdMoney.getExchangedTo(currency: StdMoney.Currency): Double {
-        return getMoneyValue()
+        return MoneyExchangeUtils.exchange(this, currency).getMoneyValue()
     }
 
     override fun getMoneyCurrency(): StdMoney.Currency {
@@ -22,7 +22,7 @@ open class Money(
     //////////////////// - GENERIC - ////////////////////
 
     override fun toString(): String {
-        return "Money(value=${getMoneyValue()}, currency='${getMoneyCurrency()}')"
+        return "Money(value=${getMoneyValue()}, currency='${getMoneyCurrency().getCurrency()}')"
     }
 
     override fun inc(): Money = apply {
@@ -38,6 +38,11 @@ open class Money(
         return Money(value = temp, currency = this.currency)
     }
 
+    override fun minus(other: StdMoney): Money {
+        val temp = this.value - other.getExchangedTo(this.currency)
+        return Money(value = temp, currency = this.currency)
+    }
+
     override fun divide(other: StdMoney): Money {
         val temp = this.value / other.getExchangedTo(this.currency)
         return Money(value = temp, currency = this.currency)
@@ -48,27 +53,28 @@ open class Money(
         return Money(value = temp, currency = this.currency)
     }
 
-    override fun plusAssign(other: StdMoney) {
+    override fun plusAssign(other: StdMoney): Money = apply {
         this.value = this.value + other.getExchangedTo(this.currency)
     }
 
-    override fun divideAssign(other: StdMoney) {
+    override fun minusAssign(other: StdMoney): Money = apply {
+        this.value = this.value - other.getExchangedTo(this.currency)
+    }
+
+    override fun divideAssign(other: StdMoney): Money = apply {
         this.value = this.value / other.getExchangedTo(this.currency)
     }
 
-    override fun multiplyAssign(other: StdMoney) {
+    override fun multiplyAssign(other: StdMoney): Money = apply {
         this.value = this.value * other.getExchangedTo(this.getMoneyCurrency())
     }
 
     companion object {
-        val ZERO: StdMoney
-            get() = Money()
-
         val ONE: StdMoney
-            get() = Money(value = 1.0)
+            get() = StdMoney.initMoney(1.0)
 
         val TEN: StdMoney
-            get() = Money(value = 10.0)
+            get() = StdMoney.initMoney(10.0)
 
         /**
          * Create a new money object with custom value
@@ -81,11 +87,7 @@ open class Money(
         }
 
         fun from(value: Double, currency: String): Money {
-            return create(value, object : StdMoney.Currency {
-                override fun getCurrency(): String {
-                    return currency.toUpperCase().trim()
-                }
-            })
+            return create(value, StdMoney.initCurrency(currency))
         }
 
         fun from(money: StdMoney): Money {

src/main/kotlin/com/cubetiqs/money/MoneyCurrency.kt

@@ -11,7 +11,7 @@ import java.io.Serializable
 open class MoneyCurrency(
     private val name: String,
     private val symbol: String? = null,
-    private val configs: Map<String, Any?>? = null,
+    private var configs: Map<String, Any?>? = null,
 ) : Serializable, StdMoney.Currency {
     override fun getCurrency(): String {
         return name.toUpperCase().trim()
@@ -21,6 +21,14 @@ open class MoneyCurrency(
         return symbol ?: getConfigs()["symbol"]?.toString()
     }
 
+    fun addConfig(key: String, value: Any?) = apply {
+        if (this.configs.isNullOrEmpty()) {
+            this.configs = mutableMapOf(key to value)
+        } else {
+            (this.configs as MutableMap)[key] = value
+        }
+    }
+
     fun getConfigs(): Map<String, Any?> {
         return configs ?: emptyMap()
     }
@@ -35,9 +43,9 @@ open class MoneyCurrency(
         }
 
         val USD
-            get() = create("USD")
+            get() = StdMoney.USD
 
         val KHR
-            get() = create("KHR")
+            get() = StdMoney.KHR
     }
 }

src/main/kotlin/com/cubetiqs/money/MoneyExchangeUtils.kt

@@ -11,11 +11,7 @@ object MoneyExchangeUtils {
         return amountFrom * ((baseRate / rateFrom) / (baseRate / rateTo))
     }
 
-    fun getBaseCurrency(): MoneyCurrency {
-        return MoneyCurrency.USD
-    }
-
-    fun getExchangeRate(currency: MoneyCurrency): Double {
-        return 0.0
+    fun getBaseCurrency(): StdMoney.Currency {
+        return StdMoney.USD
     }
 }

src/main/kotlin/com/cubetiqs/money/MoneyExtension.kt

@@ -1,9 +1,99 @@
 package com.cubetiqs.money
 
-fun StdMoney.exchangeTo(currency: StdMoney.Currency): StdMoney {
+infix fun StdMoney.exchangeTo(currency: StdMoney.Currency): StdMoney {
     return MoneyExchangeUtils.exchange(this, currency)
 }
 
+infix fun StdMoney.exchangeTo(currency: String): StdMoney = this exchangeTo object : StdMoney.Currency {
+    override fun getCurrency(): String {
+        return currency.toUpperCase().trim()
+    }
+}
+
+infix fun StdMoney.plusWith(other: StdMoney): StdMoney = this + other
+infix fun StdMoney.minusWith(other: StdMoney): StdMoney = this - other
+infix fun StdMoney.divideWith(other: StdMoney): StdMoney = this / other
+infix fun StdMoney.multiplyWith(other: StdMoney): StdMoney = this * other
+
+infix fun StdMoney.plusOf(value: Number): StdMoney = object : StdMoney {
+    override fun getMoneyCurrency(): StdMoney.Currency {
+        return this@plusOf.getMoneyCurrency()
+    }
+
+    override fun getMoneyValue(): Double {
+        return this@plusOf.getMoneyValue() + value.toDouble()
+    }
+}
+
+infix fun StdMoney.minusOf(value: Number): StdMoney = object : StdMoney {
+    override fun getMoneyCurrency(): StdMoney.Currency {
+        return this@minusOf.getMoneyCurrency()
+    }
+
+    override fun getMoneyValue(): Double {
+        return this@minusOf.getMoneyValue() - value.toDouble()
+    }
+}
+
+infix fun StdMoney.divideOf(value: Number): StdMoney = object : StdMoney {
+    override fun getMoneyCurrency(): StdMoney.Currency {
+        return this@divideOf.getMoneyCurrency()
+    }
+
+    override fun getMoneyValue(): Double {
+        return this@divideOf.getMoneyValue() / value.toDouble()
+    }
+}
+
+infix fun StdMoney.multiplyOf(value: Number): StdMoney = object : StdMoney {
+    override fun getMoneyCurrency(): StdMoney.Currency {
+        return this@multiplyOf.getMoneyCurrency()
+    }
+
+    override fun getMoneyValue(): Double {
+        return this@multiplyOf.getMoneyValue() * value.toDouble()
+    }
+}
+
+infix fun Number.withCurrency(currency: StdMoney.Currency): StdMoney = object : StdMoney {
+    override fun getMoneyCurrency(): StdMoney.Currency {
+        return currency
+    }
+
+    override fun getMoneyValue(): Double {
+        return this@withCurrency.toDouble()
+    }
+}
+
+infix fun Number.withCurrency(currency: String): StdMoney = this withCurrency object : StdMoney.Currency {
+    override fun getCurrency(): String {
+        return currency.toUpperCase().trim()
+    }
+}
+
+// toString function for StdMoney interface
+fun StdMoney.asString(): String = "StdMoney(value=${getMoneyValue()}, currency=${getMoneyCurrency().getCurrency()})"
+fun StdMoney.asMoneyString(): String = "${getMoneyValue()}:${getMoneyCurrency().getCurrency()}"
+fun String?.fromStringToMoney(): StdMoney {
+    val values = this?.split(":")
+    if (values.isNullOrEmpty()) {
+        return StdMoney.ZERO
+    }
+
+    val currency = StdMoney.initCurrency(values.firstOrNull())
+    val value = values.lastOrNull()?.toDouble() ?: 0.0
+
+    return object : StdMoney {
+        override fun getMoneyCurrency(): StdMoney.Currency {
+            return currency
+        }
+
+        override fun getMoneyValue(): Double {
+            return value
+        }
+    }
+}
+
 fun StdMoney.isMatchedCurrency(currency: StdMoney.Currency) =
     this.getMoneyCurrency().getCurrency().equals(currency.getCurrency(), ignoreCase = true)
 

src/main/kotlin/com/cubetiqs/money/MoneyObject.kt

@@ -4,7 +4,7 @@ import java.io.Serializable
 
 sealed class MoneyObject : Serializable, StdMoney {
     private var value: Double = 0.0
-    private var currency: MoneyCurrency = MoneyCurrency.USD
+    private var currency: StdMoney.Currency = MoneyCurrency.USD
     private val moneyStates: MutableMap<MoneyCurrency, MoneyState> = mutableMapOf()
 
     constructor(value: Double, currency: MoneyCurrency) {
@@ -32,7 +32,7 @@ sealed class MoneyObject : Serializable, StdMoney {
 
     companion object {
         @JvmStatic
-        private fun defaultCurrency(): MoneyCurrency {
+        private fun defaultCurrency(): StdMoney.Currency {
             return MoneyExchangeUtils.getBaseCurrency()
         }
     }

src/main/kotlin/com/cubetiqs/money/MoneyOperator.kt

@@ -7,11 +7,21 @@ operator fun StdMoney.unaryPlus() = (+getMoneyValue())
 // operators
 operator fun StdMoney.inc() = Money.from(this).inc()
 operator fun StdMoney.dec() = Money.from(this).dec()
-operator fun StdMoney.plus(other: StdMoney) = Money.from(this).plusAssign(other)
+operator fun StdMoney.plus(other: StdMoney): StdMoney {
+    val result = Money.from(this)
+    result.plusAssign(other)
+    return result
+}
+operator fun StdMoney.minus(other: StdMoney): StdMoney {
+    val result = Money.from(this)
+    result.minusAssign(other)
+    return result
+}
 operator fun StdMoney.times(other: StdMoney) = Money.from(this).multiplyAssign(other)
 operator fun StdMoney.div(other: StdMoney) = Money.from(this).divideAssign(other)
 
 // assign operators
-operator fun Money.timesAssign(other: StdMoney) = this.multiplyAssign(other)
-operator fun Money.plusAssign(other: StdMoney) = this.plusAssign(other)
-operator fun Money.divAssign(other: StdMoney) = this.divideAssign(other)
+operator fun Money.timesAssign(other: StdMoney) = this.multiplyAssign(other).nor()
+operator fun Money.plusAssign(other: StdMoney) = this.plusAssign(other).nor()
+operator fun Money.minusAssign(other: StdMoney) = this.minusAssign(other).nor()
+operator fun Money.divAssign(other: StdMoney) = this.divideAssign(other).nor()

src/main/kotlin/com/cubetiqs/money/StdMoney.kt

@@ -35,6 +35,7 @@ interface StdMoney {
 
     interface Operator<T : StdMoney> {
         fun plus(other: StdMoney): T
+        fun minus(other: StdMoney): T
         fun divide(other: StdMoney): T
 
         fun inc(): T
@@ -42,8 +43,42 @@ interface StdMoney {
         fun multiply(other: StdMoney): T
 
         // assign operators
-        fun plusAssign(other: StdMoney)
-        fun divideAssign(other: StdMoney)
-        fun multiplyAssign(other: StdMoney)
+        fun plusAssign(other: StdMoney): T
+        fun minusAssign(other: StdMoney): T
+        fun divideAssign(other: StdMoney): T
+        fun multiplyAssign(other: StdMoney): T
+
+        // none-of-return
+        fun nor() {}
+    }
+
+    companion object {
+        fun initCurrency(currency: String?): Currency {
+            return object : Currency {
+                override fun getCurrency(): String {
+                    return currency?.toUpperCase()?.trim() ?: "USD"
+                }
+            }
+        }
+
+        val USD
+            get() = initCurrency("USD")
+        val KHR
+            get() = initCurrency("KHR")
+
+        fun initMoney(initValue: Double, currency: Currency = USD): StdMoney {
+            return object : StdMoney {
+                override fun getMoneyCurrency(): Currency {
+                    return currency
+                }
+
+                override fun getMoneyValue(): Double {
+                    return initValue
+                }
+            }
+        }
+
+        val ZERO
+            get() = initMoney(0.0, USD)
     }
 }

src/test/kotlin/MoneyTests.kt

@@ -5,13 +5,6 @@ import org.junit.Test
 class MoneyTests {
     @Test
     fun exchange_2usd_to_khr_test() {
-//        val properties = MoneyConfig
-//            .MoneyConfigProperties
-//            .MoneyConfigPropertiesBuilder()
-//            .setDeliEqual(':')
-//            .setDeliSplit(',')
-//            .build()
-
         applyMoneyConfig {
             setProperties(buildMoneyConfigProperties {
                 setDeliEqual(':')
@@ -26,11 +19,19 @@ class MoneyTests {
         // Is valid for money config?
         Assert.assertTrue(MoneyConfig.isValid())
 
-        val moneyUsd = Money(2.0)
-        val moneyKhr = MoneyExchangeUtils.exchange(moneyUsd, MoneyCurrency.create("KHR"))
+        // arithmetic operators calculation
+        val moneyUsd =
+            (2 withCurrency "usd") divideWith (2 withCurrency "usd") plusOf 1 minusOf 1 plusOf 1 multiplyOf 2 divideOf 2 divideWith (8000 withCurrency "khr") plusOf 1
+        val moneyKhr = moneyUsd exchangeTo "khr"
 
         // Is correct exchange?
         Assert.assertEquals(8000.0, moneyKhr.getMoneyValue(), 0.0)
+
+        // complex operators and exchanging
+        val sum =
+            ((moneyUsd + moneyKhr) * Money.TEN) exchangeTo MoneyCurrency.KHR minusWith (Money.ONE exchangeTo MoneyCurrency.KHR)
+
+        Assert.assertEquals(156000.0, sum.getMoneyValue(), 0.0)
     }
 
     object MyBatchRates {