Fix parsing channel url

Shared Tests/URLParserTests.swift

@@ -13,6 +13,7 @@ final class URLParserTests: XCTestCase {
 
     private static let channelsByName: [String: String] = [
         "https://www.youtube.com/c/tennistv": "tennistv",
+        "https://www.youtube.com/achannel": "achannel",
         "youtube.com/c/MKBHD": "MKBHD",
         "c/ABCDE": "ABCDE"
     ]

Shared/URLParser.swift

@@ -43,12 +43,22 @@ struct URLParser {
         }
 
         guard let id = videoID, !id.isEmpty else {
+            if isYoutubeHost {
+                return .channel
+            }
+
             return nil
         }
 
         return .video
     }
 
+    var isYoutubeHost: Bool {
+        guard let urlComponents = urlComponents else { return false }
+
+        return urlComponents.host == "youtube.com" || urlComponents.host == "www.youtube.com"
+    }
+
     var videoID: String? {
         if host == "youtu.be", !path.isEmpty {
             return String(path.suffix(from: path.index(path.startIndex, offsetBy: 1)))
@@ -88,7 +98,10 @@ struct URLParser {
     }
 
     var channelName: String? {
-        guard hasAnyOfPrefixes(path, ["c/", "/c/"]) else { return nil }
+        guard hasAnyOfPrefixes(path, ["c/", "/c/"]) else {
+            if isYoutubeHost { return pathWithoutForwardSlash }
+            return nil
+        }
         return removePrefixes(path, Self.prefixes[.channel]!.map { [$0, "/"].joined() })
     }
 
@@ -108,6 +121,12 @@ struct URLParser {
         urlComponents?.host ?? ""
     }
 
+    private var pathWithoutForwardSlash: String {
+        guard let urlComponents = urlComponents else { return "" }
+
+        return String(urlComponents.path.dropFirst())
+    }
+
     private var path: String {
         removePrefixes(urlComponents?.path ?? "", ["www.youtube.com", "youtube.com"])
     }