convert to use service

Controllers/ApiController.cs

@@ -1,4 +1,5 @@
-using Microsoft.AspNetCore.Mvc;
+using BinaryDad.Notes.Services;
+using Microsoft.AspNetCore.Mvc;
 
 namespace BinaryDad.Notes.Controllers;
 
@@ -6,11 +7,11 @@ namespace BinaryDad.Notes.Controllers;
 [Route("[controller]")]
 public class ApiController : ControllerBase
 {
-    private readonly string filePath;
+    private readonly INoteService noteService;
 
-    public ApiController(IConfiguration configuration)
+    public ApiController(INoteService noteService)
     {
-        filePath = configuration["ContentFilePath"];
+        this.noteService = noteService;
     }
 
     [HttpPost]
@@ -24,7 +25,7 @@ public class ApiController : ControllerBase
             content = await reader.ReadToEndAsync();
         }
 
-        await System.IO.File.WriteAllTextAsync(filePath, content);
+        noteService.Save(content);
 
         return true;
     }

Controllers/HomeController.cs

@@ -1,19 +1,20 @@
-using Microsoft.AspNetCore.Mvc;
+using BinaryDad.Notes.Services;
+using Microsoft.AspNetCore.Mvc;
 
 namespace BinaryDad.Notes.Controllers;
 
 public class HomeController : Controller
 {
-    private readonly string filePath;
+    private readonly INoteService noteService;
 
-    public HomeController(IConfiguration configuration)
+    public HomeController(INoteService noteService)
     {
-         filePath = configuration["ContentFilePath"];
+        this.noteService = noteService;
     }
 
     public IActionResult Index()
     {
-        var content = System.IO.File.ReadAllText(filePath);
+        var content = noteService.Get();
 
         return View((object)content);
     }

Program.cs

@@ -1,7 +1,10 @@
+using BinaryDad.Notes.Services;
+
 var builder = WebApplication.CreateBuilder(args);
 
 // Add services to the container.
 builder.Services.AddControllersWithViews();
+builder.Services.AddSingleton<INoteService, FileNoteService>();
 
 var app = builder.Build();
 
@@ -13,15 +16,6 @@ if (!app.Environment.IsDevelopment())
     app.UseHsts();
 }
 
-// create file
-var configuration = app.Services.GetService<IConfiguration>();
-var filePath = configuration["ContentFilePath"];
-
-if (!File.Exists(filePath))
-{
-    File.WriteAllText(filePath, "Hi! Feel free to start typing. Everything will be saved soon after you are done typing.");
-}
-
 app.UseHttpsRedirection();
 app.UseStaticFiles();
 

Services/FileNoteService.cs

@@ -0,0 +1,28 @@
+namespace BinaryDad.Notes.Services
+{
+    public class FileNoteService : INoteService
+    {
+        private readonly string? filePath;
+
+        public FileNoteService(IConfiguration configuration)
+        {
+            filePath = configuration["ContentFilePath"];
+
+            // ensure initialized
+            if (!File.Exists(filePath))
+            {
+                File.WriteAllText(filePath, "Hi! Feel free to start typing. Everything will be saved soon after you are done typing.");
+            }
+        }
+
+        public string Get()
+        {
+            return File.ReadAllText(filePath);
+        }
+
+        public void Save(string content)
+        {
+            File.WriteAllText(filePath, content);
+        }
+    }
+}

Services/INoteService.cs

@@ -0,0 +1,8 @@
+namespace BinaryDad.Notes.Services
+{
+    public interface INoteService
+    {
+        string Get();
+        void Save(string content);
+    }
+}