Add exchanger from fixer.io and dynamic load rates

src/main/kotlin/com/example/demo/DemoApplication.kt

@@ -3,11 +3,8 @@ package com.example.demo
 import com.example.demo.domain.Currency
 import com.example.demo.domain.Money
 import com.example.demo.domain.MoneyConfig
-import com.example.demo.domain.MoneyDyn
-import com.example.demo.domain.addMoney
 import com.example.demo.domain.exchange
-import com.example.demo.domain.plus
-import com.example.demo.domain.toStdMoneyFormatable
+import com.example.demo.rest.RestWebClient
 import org.springframework.boot.CommandLineRunner
 import org.springframework.boot.autoconfigure.SpringBootApplication
 import org.springframework.boot.runApplication
@@ -27,7 +24,7 @@ class DemoApplication : CommandLineRunner {
         // val result = MoneyConfig.parse(config)
         // println(result)
 
-        MoneyConfig.parse("USD=1,KHR=4000,EUR=0.99")
+        // MoneyConfig.parse("USD=1,KHR=4000,EUR=0.99")
 
         // val value1 = MoneyDyn(value = 2.0, currency = "USD")
         // val value2 = MoneyDyn(value = 20000.0, currency = "KHR")
@@ -38,13 +35,22 @@ class DemoApplication : CommandLineRunner {
         // // val result = value1.exchange("KHR")
         // println(value1.exchangeTo("KHR")) // 7
 
-        val moneyUsd = Money(2.0)
-            .addMoney(20000.0, "USD")
-            .exchange("KHR")
-            .toStdMoneyFormatable()
-            .formatMoneyDisplay()
+        // val moneyUsd = Money(2.0)
+        //     .addMoney(20000.0, "USD")
+        //     .exchange("KHR")
+        //     .toStdMoneyFormatable()
+        //     .formatMoneyDisplay()
+        //
+        // println(moneyUsd)
 
-        println(moneyUsd)
+        val url = "http://data.fixer.io/api/latest?access_key=381f3bac3cb8beed200cc4e17c0f8bb4&symbols=USD,KHR,EUR"
+        val result = RestWebClient.getRates(url)
+        // println(result)
+        MoneyConfig.loadFrom(result)
+
+        val moneyUsd = Money(10.0, currency = Currency.USD)
+        val moneyResult = moneyUsd.exchange("KHR")
+        println(moneyResult)
     }
 }
 

src/main/kotlin/com/example/demo/config/BeanConfig.kt

@@ -0,0 +1,13 @@
+package com.example.demo.config
+
+import org.springframework.context.annotation.Bean
+import org.springframework.context.annotation.Configuration
+import org.springframework.web.client.RestTemplate
+
+@Configuration
+class BeanConfig {
+    @Bean
+    fun restTemplate(): RestTemplate {
+        return RestTemplate()
+    }
+}

src/main/kotlin/com/example/demo/domain/Money.kt

@@ -27,6 +27,7 @@ class Money (
 
 enum class Currency (val symbol: Char, val displayName: String) {
     USD('$', "Dollar"),
+    EUR('E', ""),
     KHR('R', "Riel");
 
     companion object {

src/main/kotlin/com/example/demo/domain/MoneyConfig.kt

@@ -38,6 +38,16 @@ object MoneyConfig {
         return result
     }
 
+    fun loadFrom(rates: List<RateModel>) {
+        this.config.clear()
+
+        rates.forEach {
+            if (!it.curreny.isNullOrEmpty()) {
+                this.config[it.curreny!!] = it.rate ?: 1.0
+            }
+        }
+    }
+
     // all currencies with its rate
     fun getConfig() = this.config
 

src/main/kotlin/com/example/demo/domain/RateModel.kt

@@ -0,0 +1,6 @@
+package com.example.demo.domain
+
+data class RateModel(
+    var curreny: String? = null,
+    var rate: Double? = null
+)

src/main/kotlin/com/example/demo/rest/RestWebClient.kt

@@ -0,0 +1,30 @@
+package com.example.demo.rest
+
+import com.example.demo.domain.RateModel
+import com.fasterxml.jackson.databind.JsonNode
+import org.springframework.web.client.RestTemplate
+import org.springframework.web.client.getForObject
+
+object RestWebClient {
+    private val restTemplate = RestTemplate()
+    fun getRequest(requestUrl: String): Any? {
+        val response = restTemplate.getForObject<Any>(requestUrl)
+        return response
+    }
+
+    fun getRequestForModel(requestUrl: String): JsonNode? {
+        val response = restTemplate.getForObject<JsonNode>(requestUrl)
+        return response
+    }
+
+    fun getRates(requestUrl: String): List<RateModel> {
+        val response = getRequestForModel(requestUrl) ?: return emptyList()
+        val rates = response.get("rates")
+        val rateData = mutableListOf<RateModel>()
+        rates.fields()
+            .forEachRemaining {
+                rateData.add(RateModel(it.key, it.value.asDouble()))
+            }
+        return rateData
+    }
+}