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Vending Machine sample app
Added sample app
1 parent 181ce88 commit 2ae9faf

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‎FunctionalStateMachine.sln‎

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@@ -39,6 +39,10 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "FunctionalStateMachine.Comm
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "FunctionalStateMachine.CommandRunner.Generator", "FunctionalStateMachine.CommandRunner.Generator\FunctionalStateMachine.CommandRunner.Generator.csproj", "{F2EB10B5-AD83-47A7-BFA3-3A552B06AC76}"
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "VendingMachineSampleApp", "VendingMachineSampleApp\VendingMachineSampleApp.csproj", "{E6646DD6-3BA5-4A57-B644-59D670F81002}"
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "VendingMachineSampleApp.Tests", "VendingMachineSampleApp.Tests\VendingMachineSampleApp.Tests.csproj", "{62D20B6C-490F-4616-A311-18D52A4E8F8C}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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{F2EB10B5-AD83-47A7-BFA3-3A552B06AC76}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{F2EB10B5-AD83-47A7-BFA3-3A552B06AC76}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{F2EB10B5-AD83-47A7-BFA3-3A552B06AC76}.Release|Any CPU.Build.0 = Release|Any CPU
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{E6646DD6-3BA5-4A57-B644-59D670F81002}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{E6646DD6-3BA5-4A57-B644-59D670F81002}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{E6646DD6-3BA5-4A57-B644-59D670F81002}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{E6646DD6-3BA5-4A57-B644-59D670F81002}.Release|Any CPU.Build.0 = Release|Any CPU
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{62D20B6C-490F-4616-A311-18D52A4E8F8C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{62D20B6C-490F-4616-A311-18D52A4E8F8C}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{62D20B6C-490F-4616-A311-18D52A4E8F8C}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{62D20B6C-490F-4616-A311-18D52A4E8F8C}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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EndGlobal

‎VendingMachineSampleApp.Tests/VendingMachineSampleApp.Tests.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>net9.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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<IsPackable>false</IsPackable>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="coverlet.collector" Version="6.0.2" />
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<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
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<PackageReference Include="xunit" Version="2.9.2" />
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<PackageReference Include="xunit.runner.visualstudio" Version="2.8.2" />
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</ItemGroup>
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<ItemGroup>
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<Using Include="Xunit" />
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</ItemGroup>
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<ItemGroup>
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<ProjectReference Include="..\VendingMachineSampleApp\VendingMachineSampleApp.csproj" />
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</ItemGroup>
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</Project>

‎VendingMachineSampleApp.Tests/VendingMachineSampleTests.cs‎

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using VendingMachineSampleApp.Configuration;
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using VendingMachineSampleApp.Domain;
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namespace VendingMachineSampleApp.Tests;
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public class VendingMachineSampleTests
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{
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[Fact]
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public void SelectItem_InStock_TransitionsToItemSelected()
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{
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var machine = VendingMachineBuilder.BuildMachine();
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var data = VendingMachineData.Initialize(CreateInventory());
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var (newState, newData, _) = machine.Fire(new SelectItemTrigger("A1"), VendingMachineState.Idle, data);
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Assert.Equal(VendingMachineState.ItemSelected, newState);
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Assert.Equal("A1", newData.SelectedItemCode);
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Assert.Equal(0m, newData.MoneyInserted);
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}
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[Fact]
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public void SelectItem_OutOfStock_TransitionsToOutOfStock()
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{
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var machine = VendingMachineBuilder.BuildMachine();
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var data = VendingMachineData.Initialize(CreateInventory(stock: 0));
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var (newState, newData, _) = machine.Fire(new SelectItemTrigger("A1"), VendingMachineState.Idle, data);
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Assert.Equal(VendingMachineState.OutOfStock, newState);
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Assert.Null(newData.SelectedItemCode);
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}
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[Fact]
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public void InsertMoney_Enough_TransitionsToDispensing()
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{
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var machine = VendingMachineBuilder.BuildMachine();
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var data = VendingMachineData.Initialize(CreateInventory());
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var (selectedState, selectedData, _) = machine.Fire(new SelectItemTrigger("A1"), VendingMachineState.Idle, data);
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var (newState, newData, _) = machine.Fire(new InsertMoneyTrigger(2.00m), selectedState, selectedData);
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Assert.Equal(VendingMachineState.DispensingItem, newState);
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Assert.Equal(2.00m, newData.MoneyInserted);
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}
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[Fact]
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public void DispenseComplete_WithChange_GoesToReturningChangeThenIdle()
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{
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var machine = VendingMachineBuilder.BuildMachine();
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var data = VendingMachineData.Initialize(CreateInventory());
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var (selectedState, selectedData, _) = machine.Fire(new SelectItemTrigger("A1"), VendingMachineState.Idle, data);
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var (dispenseState, dispenseData, _) = machine.Fire(new InsertMoneyTrigger(2.00m), selectedState, selectedData);
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var (returningState, returningData, _) = machine.Fire(new DispenseCompleteTrigger(), dispenseState, dispenseData);
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var (idleState, idleData, _) = machine.Fire(new DispenseCompleteTrigger(), returningState, returningData);
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Assert.Equal(VendingMachineState.ReturningChange, returningState);
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Assert.Equal(VendingMachineState.Idle, idleState);
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Assert.Null(idleData.SelectedItemCode);
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Assert.Equal(0m, idleData.MoneyInserted);
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}
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[Fact]
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public void DispenseComplete_NoChange_GoesDirectlyToIdle()
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{
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var machine = VendingMachineBuilder.BuildMachine();
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var data = VendingMachineData.Initialize(CreateInventory());
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var (selectedState, selectedData, _) = machine.Fire(new SelectItemTrigger("A1"), VendingMachineState.Idle, data);
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var (dispenseState, dispenseData, _) = machine.Fire(new InsertMoneyTrigger(1.50m), selectedState, selectedData);
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var (idleState, idleData, _) = machine.Fire(new DispenseCompleteTrigger(), dispenseState, dispenseData);
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Assert.Equal(VendingMachineState.Idle, idleState);
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Assert.Null(idleData.SelectedItemCode);
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Assert.Equal(0m, idleData.MoneyInserted);
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}
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private static Dictionary<string, VendingItem> CreateInventory(int stock = 5)
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{
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return new Dictionary<string, VendingItem>
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{
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["A1"] = new("A1", "Chips", 1.50m, stock)
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};
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}
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}

‎VendingMachineSampleApp/CommandRunners/DispenseItemHandler.cs‎

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using FunctionalStateMachine.CommandRunner;
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using VendingMachineSampleApp.Domain;
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namespace VendingMachineSampleApp.CommandRunners;
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/// <summary>
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/// Handles DispenseItemCommand by simulating the physical dispensing of an item.
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/// In a real system, this would trigger motor control hardware to dispense the product.
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/// </summary>
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public class DispenseItemHandler : ICommandRunner<DispenseItemCommand>
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{
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public void Run(DispenseItemCommand command)
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{
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Console.ForegroundColor = ConsoleColor.Yellow;
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Console.WriteLine($"🔊 *motor whirring sounds*");
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Console.WriteLine($"📦 Dispensing {command.ItemCode}...");
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// Simulate mechanical delay
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Thread.Sleep(500);
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Console.WriteLine($"✓ Item dispensed successfully");
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Console.ResetColor();
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}
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}

‎VendingMachineSampleApp/CommandRunners/DisplayMessageHandler.cs‎

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using FunctionalStateMachine.CommandRunner;
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using VendingMachineSampleApp.Domain;
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namespace VendingMachineSampleApp.CommandRunners;
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/// <summary>
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/// Handles DisplayMessageCommand by outputting messages to the console.
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/// Simulates updating a vending machine display screen.
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/// </summary>
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public class DisplayMessageHandler : ICommandRunner<DisplayMessageCommand>
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{
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public void Run(DisplayMessageCommand command)
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{
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Console.ForegroundColor = ConsoleColor.Cyan;
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Console.WriteLine($"🖥️ {command.Message}");
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Console.ResetColor();
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}
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}

‎VendingMachineSampleApp/CommandRunners/LogTransactionHandler.cs‎

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using FunctionalStateMachine.CommandRunner;
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using VendingMachineSampleApp.Domain;
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namespace VendingMachineSampleApp.CommandRunners;
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/// <summary>
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/// Handles LogTransactionCommand by writing transaction records to console.
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/// In a real system, this would write to a file, database, or logging service.
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/// </summary>
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public class LogTransactionHandler : ICommandRunner<LogTransactionCommand>
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{
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public void Run(LogTransactionCommand command)
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{
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var status = command.Success ? "✓ SUCCESS" : "✗ FAILED";
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Console.ForegroundColor = ConsoleColor.Gray;
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Console.WriteLine($"💾 [LOG] Transaction: {command.ItemCode} | Amount: ${command.AmountPaid:F2} | {status}");
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Console.ResetColor();
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}
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}

‎VendingMachineSampleApp/CommandRunners/PlaySoundHandler.cs‎

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using FunctionalStateMachine.CommandRunner;
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using VendingMachineSampleApp.Domain;
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namespace VendingMachineSampleApp.CommandRunners;
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/// <summary>
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/// Handles PlaySoundCommand by playing different sound effects to the user.
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/// In a real system, this would interface with the machine's audio system.
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/// Here we just print text representations of the sounds.
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/// </summary>
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public class PlaySoundHandler : ICommandRunner<PlaySoundCommand>
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{
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public void Run(PlaySoundCommand command)
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{
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var sound = command.Sound switch
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{
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VendingSound.SelectionConfirmed => "🔊 *beep*",
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VendingSound.TransactionComplete => "🔊 *ding!*",
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VendingSound.ErrorSound => "🔊 *buzz - error sound*",
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VendingSound.DispensingSound => "🔊 *whirrrr*",
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VendingSound.CoinReturn => "🔊 *coin return chime*",
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VendingSound.JamAlert => "🔊 *ALERT - machine jam detected*",
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_ => "🔊 *sound*"
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};
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Console.WriteLine(sound);
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}
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}

‎VendingMachineSampleApp/CommandRunners/ReturnMoneyHandler.cs‎

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using FunctionalStateMachine.CommandRunner;
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using VendingMachineSampleApp.Domain;
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namespace VendingMachineSampleApp.CommandRunners;
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/// <summary>
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/// Handles ReturnMoneyCommand by simulating the coin return slot dispensing money.
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/// In a real system, this would trigger the coin mechanism to dispense physical coins or bills.
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/// </summary>
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public class ReturnMoneyHandler : ICommandRunner<ReturnMoneyCommand>
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{
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public void Run(ReturnMoneyCommand command)
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{
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if (command.Amount <= 0)
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return;
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Console.ForegroundColor = ConsoleColor.Green;
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Console.WriteLine($"💰 Returning change: ${command.Amount:F2}");
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Console.WriteLine($"🪙 *coins/bills dispensed*");
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// Simulate coin return mechanism
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Thread.Sleep(300);
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Console.ResetColor();
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}
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}

‎VendingMachineSampleApp/CommandRunners/UpdateInventoryHandler.cs‎

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using FunctionalStateMachine.CommandRunner;
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using VendingMachineSampleApp.Domain;
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namespace VendingMachineSampleApp.CommandRunners;
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/// <summary>
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/// Handles UpdateInventoryCommand by decrementing the stock of a dispensed item.
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/// Maintains the in-memory inventory state as items are sold.
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/// </summary>
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public class UpdateInventoryHandler : ICommandRunner<UpdateInventoryCommand>
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{
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private readonly Dictionary<string, VendingItem> _inventory;
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public UpdateInventoryHandler(Dictionary<string, VendingItem> inventory)
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{
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_inventory = inventory;
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}
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public void Run(UpdateInventoryCommand command)
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{
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if (_inventory.TryGetValue(command.ItemCode, out var item))
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{
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var newQuantity = item.Quantity - command.QuantityDispensed;
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_inventory[command.ItemCode] = item with { Quantity = newQuantity };
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Console.ForegroundColor = ConsoleColor.Magenta;
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Console.WriteLine($"📊 [INVENTORY] {item.Name}: {item.Quantity} → {newQuantity}");
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Console.ResetColor();
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}
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}
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}

‎VendingMachineSampleApp/CommandRunners/UpdateSalesMetricsHandler.cs‎

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using FunctionalStateMachine.CommandRunner;
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using VendingMachineSampleApp.Domain;
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namespace VendingMachineSampleApp.CommandRunners;
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/// <summary>
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/// Handles UpdateSalesMetricsCommand by tracking sales analytics.
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/// In a real system, this would send data to a monitoring/analytics service.
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/// </summary>
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public class UpdateSalesMetricsHandler : ICommandRunner<UpdateSalesMetricsCommand>
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{
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private decimal _totalRevenue = 0m;
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private int _successfulTransactions = 0;
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private int _failedTransactions = 0;
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public void Run(UpdateSalesMetricsCommand command)
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{
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_totalRevenue += command.Revenue;
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if (command.Success)
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_successfulTransactions++;
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else
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_failedTransactions++;
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var successRate = _successfulTransactions + _failedTransactions > 0
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? (decimal)_successfulTransactions / (_successfulTransactions + _failedTransactions) * 100
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: 0;
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Console.ForegroundColor = ConsoleColor.DarkGreen;
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Console.WriteLine($"📈 [METRICS] Revenue: ${_totalRevenue:F2} | Success Rate: {successRate:F1}% | Successful: {_successfulTransactions} | Failed: {_failedTransactions}");
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Console.ResetColor();
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}
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}

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