fix: improve episode matching accuracy

internal/nyaa/client_test.go

@@ -0,0 +1,52 @@
+package nyaa
+
+import "testing"
+
+func TestParseEpisodeNumber(t *testing.T) {
+	tests := []struct {
+		title    string
+		expected int
+	}{
+		// Standard fansub formats
+		{"[SubsPlease] Naruto - 01 (1080p) [ABC123].mkv", 1},
+		{"[SubsPlease] Naruto - 220 (1080p) [ABC123].mkv", 220},
+		{"[Erai-raws] One Piece - 1100 [1080p][Multiple Subtitle].mkv", 1100},
+
+		// S01E01 format
+		{"Naruto S01E01 1080p WEB-DL", 1},
+		{"Attack on Titan S04E28 Final", 28},
+
+		// Episode keyword
+		{"Naruto Episode 1 [1080p]", 1},
+		{"One Piece Episode 1089", 1089},
+
+		// E01 format
+		{"Naruto E01 [1080p]", 1},
+		{"Bleach E366 Final", 366},
+
+		// Hash/number format
+		{"Anime Title #42 [720p]", 42},
+
+		// Should NOT match these (batches/complete)
+		{"[SubsPlease] Naruto (01-220) [Batch]", 0},
+		{"Naruto Complete Series 1-220", 0},
+		{"Naruto Batch 01~220", 0},
+
+		// Should NOT match resolutions/years as episodes
+		{"Naruto The Movie 2024 [1080p]", 0},
+		{"[1920x1080] Naruto Remastered", 0},
+
+		// Version numbers should be stripped
+		{"[SubsPlease] Naruto - 05v2 (1080p)", 5},
+		{"Bleach - 100v3 [720p]", 100},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.title, func(t *testing.T) {
+			got := parseEpisodeNumber(tt.title)
+			if got != tt.expected {
+				t.Errorf("parseEpisodeNumber(%q) = %d, want %d", tt.title, got, tt.expected)
+			}
+		})
+	}
+}