Implement ExchangeRateUpdater

ExchangeRateUpdater/.vs/ExchangeRateUpdater/v17/DocumentLayout.backup.json

@@ -0,0 +1,55 @@
+{
+  "Version": 1,
+  "WorkspaceRootPath": "C:\\1_task\\ExchangeRateUpdater\\",
+  "Documents": [
+    {
+      "AbsoluteMoniker": "D:0:0:{F718280A-7459-4E33-B42A-E19CB8ACE541}|ExchangeRateUpdater\\ExchangeRateUpdater.csproj|c:\\1_task\\exchangerateupdater\\exchangerateupdater\\exchangerateprovider.cs||{A6C744A8-0E4A-4FC6-886A-064283054674}",
+      "RelativeMoniker": "D:0:0:{F718280A-7459-4E33-B42A-E19CB8ACE541}|ExchangeRateUpdater\\ExchangeRateUpdater.csproj|solutionrelative:exchangerateupdater\\exchangerateprovider.cs||{A6C744A8-0E4A-4FC6-886A-064283054674}"
+    },
+    {
+      "AbsoluteMoniker": "D:0:0:{4A3E62F0-B85E-4261-BBFD-354692E70DD6}|Demo\\Demo.csproj|c:\\1_task\\exchangerateupdater\\demo\\program.cs||{A6C744A8-0E4A-4FC6-886A-064283054674}",
+      "RelativeMoniker": "D:0:0:{4A3E62F0-B85E-4261-BBFD-354692E70DD6}|Demo\\Demo.csproj|solutionrelative:demo\\program.cs||{A6C744A8-0E4A-4FC6-886A-064283054674}"
+    }
+  ],
+  "DocumentGroupContainers": [
+    {
+      "Orientation": 0,
+      "VerticalTabListWidth": 256,
+      "DocumentGroups": [
+        {
+          "DockedWidth": 200,
+          "SelectedChildIndex": 0,
+          "Children": [
+            {
+              "$type": "Document",
+              "DocumentIndex": 0,
+              "Title": "ExchangeRateProvider.cs",
+              "DocumentMoniker": "C:\\1_task\\ExchangeRateUpdater\\ExchangeRateUpdater\\ExchangeRateProvider.cs",
+              "RelativeDocumentMoniker": "ExchangeRateUpdater\\ExchangeRateProvider.cs",
+              "ToolTip": "C:\\1_task\\ExchangeRateUpdater\\ExchangeRateUpdater\\ExchangeRateProvider.cs",
+              "RelativeToolTip": "ExchangeRateUpdater\\ExchangeRateProvider.cs",
+              "ViewState": "AgIAALcAAAAAAAAAAAAIwNUAAAAAAAAAAAAAAA==",
+              "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.000738|",
+              "WhenOpened": "2025-12-29T16:03:14.636Z",
+              "IsPinned": true,
+              "EditorCaption": ""
+            },
+            {
+              "$type": "Document",
+              "DocumentIndex": 1,
+              "Title": "Program.cs",
+              "DocumentMoniker": "C:\\1_task\\ExchangeRateUpdater\\Demo\\Program.cs",
+              "RelativeDocumentMoniker": "Demo\\Program.cs",
+              "ToolTip": "C:\\1_task\\ExchangeRateUpdater\\Demo\\Program.cs",
+              "RelativeToolTip": "Demo\\Program.cs",
+              "ViewState": "AgIAAAAAAAAAAAAAAAAAADsAAAAAAAAAAAAAAA==",
+              "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.000738|",
+              "WhenOpened": "2025-12-29T16:05:37.307Z",
+              "EditorCaption": ""
+            }
+          ]
+        }
+      ]
+    }
+  ]
+}

ExchangeRateUpdater/.vs/ExchangeRateUpdater/v17/DocumentLayout.json

@@ -0,0 +1,55 @@
+{
+  "Version": 1,
+  "WorkspaceRootPath": "C:\\1_task\\ExchangeRateUpdater\\",
+  "Documents": [
+    {
+      "AbsoluteMoniker": "D:0:0:{F718280A-7459-4E33-B42A-E19CB8ACE541}|ExchangeRateUpdater\\ExchangeRateUpdater.csproj|c:\\1_task\\exchangerateupdater\\exchangerateupdater\\exchangerateprovider.cs||{A6C744A8-0E4A-4FC6-886A-064283054674}",
+      "RelativeMoniker": "D:0:0:{F718280A-7459-4E33-B42A-E19CB8ACE541}|ExchangeRateUpdater\\ExchangeRateUpdater.csproj|solutionrelative:exchangerateupdater\\exchangerateprovider.cs||{A6C744A8-0E4A-4FC6-886A-064283054674}"
+    },
+    {
+      "AbsoluteMoniker": "D:0:0:{4A3E62F0-B85E-4261-BBFD-354692E70DD6}|Demo\\Demo.csproj|c:\\1_task\\exchangerateupdater\\demo\\program.cs||{A6C744A8-0E4A-4FC6-886A-064283054674}",
+      "RelativeMoniker": "D:0:0:{4A3E62F0-B85E-4261-BBFD-354692E70DD6}|Demo\\Demo.csproj|solutionrelative:demo\\program.cs||{A6C744A8-0E4A-4FC6-886A-064283054674}"
+    }
+  ],
+  "DocumentGroupContainers": [
+    {
+      "Orientation": 0,
+      "VerticalTabListWidth": 256,
+      "DocumentGroups": [
+        {
+          "DockedWidth": 200,
+          "SelectedChildIndex": 0,
+          "Children": [
+            {
+              "$type": "Document",
+              "DocumentIndex": 0,
+              "Title": "ExchangeRateProvider.cs",
+              "DocumentMoniker": "C:\\1_task\\ExchangeRateUpdater\\ExchangeRateUpdater\\ExchangeRateProvider.cs",
+              "RelativeDocumentMoniker": "ExchangeRateUpdater\\ExchangeRateProvider.cs",
+              "ToolTip": "C:\\1_task\\ExchangeRateUpdater\\ExchangeRateUpdater\\ExchangeRateProvider.cs",
+              "RelativeToolTip": "ExchangeRateUpdater\\ExchangeRateProvider.cs",
+              "ViewState": "AgIAALcAAAAAAAAAAAAIwNUAAAAAAAAAAAAAAA==",
+              "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.000738|",
+              "WhenOpened": "2025-12-29T16:03:14.636Z",
+              "IsPinned": true,
+              "EditorCaption": ""
+            },
+            {
+              "$type": "Document",
+              "DocumentIndex": 1,
+              "Title": "Program.cs",
+              "DocumentMoniker": "C:\\1_task\\ExchangeRateUpdater\\Demo\\Program.cs",
+              "RelativeDocumentMoniker": "Demo\\Program.cs",
+              "ToolTip": "C:\\1_task\\ExchangeRateUpdater\\Demo\\Program.cs",
+              "RelativeToolTip": "Demo\\Program.cs",
+              "ViewState": "AgIAAAAAAAAAAAAAAAAAADsAAAAAAAAAAAAAAA==",
+              "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.000738|",
+              "WhenOpened": "2025-12-29T16:05:37.307Z",
+              "EditorCaption": ""
+            }
+          ]
+        }
+      ]
+    }
+  ]
+}

ExchangeRateUpdater/Demo/Demo.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.Http" Version="10.0.1" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="10.0.1" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\ExchangeRateUpdater\ExchangeRateUpdater.csproj" />
+  </ItemGroup>
+
+</Project>

ExchangeRateUpdater/Demo/Program.cs

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+using System;
+using System.Linq;
+using System.Net.Http;
+using System.Threading;
+using System.Threading.Tasks;
+using ExchangeRateUpdater;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging;
+
+internal static class Program
+{
+    private static async Task<int> Main(string[] args)
+    {
+        using var cts = new CancellationTokenSource();
+        Console.CancelKeyPress += (_, e) =>
+        {
+            e.Cancel = true;
+            cts.Cancel();
+        };
+
+        var services = new ServiceCollection();
+
+        services.AddLogging(b =>
+        {
+            b.AddSimpleConsole(o =>
+            {
+                o.SingleLine = true;
+                o.TimestampFormat = "HH:mm:ss ";
+            });
+            b.SetMinimumLevel(LogLevel.Information);
+        });
+
+        services.AddHttpClient<ExchangeRateProvider>(c =>
+        {
+            c.Timeout = TimeSpan.FromSeconds(10);
+        });
+
+        using var provider = services.BuildServiceProvider();
+
+        var rateProvider = provider.GetRequiredService<ExchangeRateProvider>();
+
+        var currencies = new[]
+        {
+            new Currency("CZK"),
+            new Currency("EUR"),
+            new Currency("USD"),
+            new Currency("GBP"),
+        };
+
+        try
+        {
+            var rates = await rateProvider
+                .GetCzkBasedRatesAsync(currencies, cts.Token)
+                .ConfigureAwait(false);
+
+            foreach (var r in rates.OrderBy(r => r.TargetCurrency.Code))
+            {
+                Console.WriteLine(r);
+            }
+
+            return 0;
+        }
+        catch (OperationCanceledException)
+        {
+            Console.WriteLine("Cancelled.");
+            return 1;
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine($"Error: {ex.Message}");
+            return 2;
+        }
+    }
+}

ExchangeRateUpdater/ExchangeRateUpdater.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.14.36705.20 d17.14
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ExchangeRateUpdater", "ExchangeRateUpdater\ExchangeRateUpdater.csproj", "{F718280A-7459-4E33-B42A-E19CB8ACE541}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Demo", "Demo\Demo.csproj", "{4A3E62F0-B85E-4261-BBFD-354692E70DD6}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{F718280A-7459-4E33-B42A-E19CB8ACE541}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{F718280A-7459-4E33-B42A-E19CB8ACE541}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{F718280A-7459-4E33-B42A-E19CB8ACE541}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{F718280A-7459-4E33-B42A-E19CB8ACE541}.Release|Any CPU.Build.0 = Release|Any CPU
+		{4A3E62F0-B85E-4261-BBFD-354692E70DD6}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{4A3E62F0-B85E-4261-BBFD-354692E70DD6}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{4A3E62F0-B85E-4261-BBFD-354692E70DD6}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{4A3E62F0-B85E-4261-BBFD-354692E70DD6}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {7BB53F43-2197-4A44-BBD1-967E5B8C1B6F}
+	EndGlobalSection
+EndGlobal

ExchangeRateUpdater/ExchangeRateUpdater/Currency.cs

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+namespace ExchangeRateUpdater
+{
+    public class Currency
+    {
+        public Currency(string code)
+        {
+            Code = code;
+        }
+
+        /// <summary>
+        /// Three-letter ISO 4217 code of the currency.
+        /// </summary>
+        public string Code { get; }
+
+        public override string ToString()
+        {
+            return Code;
+        }
+    }
+}

ExchangeRateUpdater/ExchangeRateUpdater/ExchangeRate.cs

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+namespace ExchangeRateUpdater
+{
+    public class ExchangeRate
+    {
+        public ExchangeRate(Currency sourceCurrency, Currency targetCurrency, decimal value)
+        {
+            SourceCurrency = sourceCurrency;
+            TargetCurrency = targetCurrency;
+            Value = value;
+        }
+
+        public Currency SourceCurrency { get; }
+
+        public Currency TargetCurrency { get; }
+
+        public decimal Value { get; }
+
+        public override string ToString()
+        {
+            return $"{SourceCurrency}/{TargetCurrency}={Value}";
+        }
+    }
+}