Improved substitution page

BetterIServ.Backend/Controllers/IServController.cs

@@ -1,4 +1,5 @@
 using BetterIServ.Backend.Entities;
+using HtmlAgilityPack;
 using Microsoft.AspNetCore.Mvc;
 using PuppeteerSharp;
 using Credentials = BetterIServ.Backend.Entities.Credentials;
@@ -6,7 +7,7 @@ using Credentials = BetterIServ.Backend.Entities.Credentials;
 namespace BetterIServ.Backend.Controllers; 
 
 [ApiController]
-[Route("auth")]
+[Route("iserv")]
 public class AuthController : ControllerBase {
     
     [HttpPost("login")]
@@ -47,4 +48,28 @@ public class AuthController : ControllerBase {
         return authKeys;
     }
 
+    [HttpPost("groups")]
+    public async Task<ActionResult<SingleResult<string[]>>> GetCourses([FromBody] AuthKeys keys, [FromQuery] string domain) {
+        var client = new HttpClient();
+        var request = new HttpRequestMessage {
+            Method = HttpMethod.Get,
+            RequestUri = new Uri($"https://{domain}/iserv/profile"),
+            Headers = {
+                { "cookie", keys.ToCookieString() }
+            }
+        };
+        var raw = await (await client.SendAsync(request)).Content.ReadAsStringAsync();
+        var html = new HtmlDocument();
+        html.LoadHtml(raw);
+
+        var list = html.DocumentNode.SelectSingleNode("//body/div/div[2]/div[3]/div/div/div[2]/div/div/div/div/ul[1]");
+        var courses = new List<string>();
+        foreach (var child in list.ChildNodes) {
+            if (child.ChildNodes.Count < 1) continue;
+            courses.Add(child.ChildNodes[0].InnerText);
+        }
+        
+        return new SingleResult<string[]> { Value = courses.ToArray() };
+    }
+
 }

BetterIServ.Backend/Controllers/UnitsController.cs

@@ -42,16 +42,32 @@ public class UnitsController : ControllerBase {
             if (node.ChildNodes.Count < 9) continue;
             
             var substitution = new Substitution {
-                Class = node.ChildNodes[0].InnerText,
                 Times = node.ChildNodes[1].InnerText.Split(" - ").Select(int.Parse).ToArray(),
                 Type = node.ChildNodes[2].InnerText,
                 Representative = node.ChildNodes[3].InnerText,
-                Lesson = node.ChildNodes[4].InnerText,
+                NewLesson = node.ChildNodes[4].InnerText,
+                Lesson = node.ChildNodes[5].InnerText,
                 Room = node.ChildNodes[6].InnerText,
                 Teacher = node.ChildNodes[7].InnerText,
                 Description = node.ChildNodes[9].InnerText
             };
 
+            var classes = node.ChildNodes[0].InnerText;
+
+            if (!classes.StartsWith("Q")) {
+                string grade = new string(classes.ToCharArray().Where(char.IsNumber).ToArray());
+                var subClasses = classes.Replace(grade, "").ToCharArray();
+                var result = new string[subClasses.Length];
+
+                for (int j = 0; j < subClasses.Length; j++) {
+                    result[j] = grade + subClasses[j];
+                }
+                substitution.Classes = result;
+            }
+            else {
+                substitution.Classes = new[] { classes };
+            }
+
             data.Substitutions.Add(substitution);
         }
 

BetterIServ.Backend/Entities/AuthKeys.cs

@@ -6,4 +6,8 @@ public struct AuthKeys {
     public string AuthSid { get; set; }
     public string SatId { get; set; }
     public string AuthSession { get; set; }
+
+    public string ToCookieString() {
+        return $"IServSession={Session}; IServSAT={Sat}; IServAuthSID={AuthSid}; IServSATId={SatId}; IServAuthSession={AuthSession}";
+    }
 }

BetterIServ.Backend/Entities/Substitution.cs

@@ -1,11 +1,12 @@
 namespace BetterIServ.Backend.Entities; 
 
 public struct Substitution {
-    public string Class { get; set; }
+    public string[] Classes { get; set; }
     public int[] Times { get; set; }
     public string Type { get; set; }
     public string Representative { get; set; }
     public string Lesson { get; set; }
+    public string NewLesson { get; set; }
     public string Room { get; set; }
     public string Teacher { get; set; }
     public string Description { get; set; }