Add document the beginning of implementation

src/InternshipSystem.Api/Controllers/DocumentsController.cs

@@ -1,12 +1,16 @@
-using System;
+using System.Linq;
 using System.Threading.Tasks;
 using InternshipSystem.Api.Queries;
+using InternshipSystem.Core;
 using InternshipSystem.Repository;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
 
 namespace InternshipSystem.Api.Controllers
 {
+    [ApiController]
+    [Route("document")]
     public class DocumentsController : ControllerBase
     {
         private InternshipDbContext Context { get; }
@@ -30,7 +34,50 @@ namespace InternshipSystem.Api.Controllers
         [ProducesResponseType(StatusCodes.Status400BadRequest)]
         [ProducesResponseType(StatusCodes.Status404NotFound)]
         [ProducesResponseType(StatusCodes.Status401Unauthorized)]
-        public async Task<ActionResult> AddDocumentToInternship([FromBody] DocumentPublishRequest document) =>
-            throw new NotImplementedException();
+        public async Task<ActionResult> AddDocumentToInternship([FromBody] DocumentPublishRequest document)
+        {
+            // TODO:
+            // if not authorised then
+            // return Unauthorized();
+            
+            // TODO:
+            // is request is valid??
+            // if not then
+            // return BadRequest();
+            
+            var studentInternship = await GetCurrentStudentInternship();
+            if (document.Id != null)
+            {
+                var doc = studentInternship.Documentation
+                    .Find(d => d.Id == document.Id);
+                if (doc == null)
+                    return NotFound();
+                doc.Description = document.Description;
+                doc.Scan = document.Scan;
+                doc.Type = document.Type;
+                doc.State = DocumentState.Submitted;
+            }
+            else
+            {
+                studentInternship.Documentation.Add(
+                    new Document()
+                    {
+                        Description = document.Description,
+                        Scan = document.Scan,
+                        Type = document.Type,
+                        State = DocumentState.Submitted
+                    });
+            }
+            return Ok();
+        }
+
+        //TODO: rewrite when authentication will be implemented
+        private async Task<Internship> GetCurrentStudentInternship()
+        {
+            return Context.Editions
+                .FirstAsync().Result
+                .Internships
+                .First();
+        }
     }
 }