Added accept and decline functions

API/Controllers/GroupCandidatesController.cs

@@ -47,8 +47,33 @@ namespace StudyLib.API.Controllers
             return NoContent();
         }
 
-        [HttpDelete("delete/{groupId}/{userId}")]
+        [HttpGet("accept/{groupId}/{userId}")]
-        public async Task<IActionResult> DeleteGroupCandidate(long groupId, string userId)
+        public async Task<IActionResult> AcceptGroupCandidate(long groupId, string userId)
+        {
+            var groupCandidate = await _context.GroupCandidates.Where(g => g.Group.ID == groupId && g.User.Id == userId).FirstAsync();
+            if (groupCandidate == null)
+            {
+                return NotFound();
+            }
+
+            _context.GroupCandidates.Remove(groupCandidate);
+
+            var user = await _context.Users.FindAsync(userId);
+            var group = await _context.Groups.Where(g => g.ID == groupId).Include(g => g.Users).FirstAsync();
+
+            if (!group.Users.Contains(user))
+            {
+                group.Users.Add(user);
+                _context.Entry(group).State = EntityState.Modified;
+            }
+
+            await _context.SaveChangesAsync();
+
+            return NoContent();
+        }
+
+        [HttpDelete("decline/{groupId}/{userId}")]
+        public async Task<IActionResult> DeclineGroupCandidate(long groupId, string userId)
         {
             var groupCandidate = await _context.GroupCandidates.Where(g => g.Group.ID == groupId && g.User.Id == userId).FirstAsync();
             if (groupCandidate == null)