feat: idnorm and playlist support

idnorm_test.go

@@ -0,0 +1,68 @@
+package main
+
+import "testing"
+
+func TestNormalizeChannelID(t *testing.T) {
+	cases := []struct {
+		in, want string
+	}{
+		{"Italia 1", "italia1"},
+		{"Italia 1.it", "italia1"},
+		{"italia 1", "italia1"},
+		{"  Italia 1  ", "italia1"},
+		{"Italia-1", "italia1"},
+		{"Rai 1", "rai1"},
+		{"Rai 1.it", "rai1"},
+		{"ESPN.com", "espn"},
+		{"Channel 4.uk", "channel4"},
+
+		// Quality-marker stripping — open-epg shape vs. playlist shape.
+		{"Italia 1 HD.it", "italia1"},
+		{"Rai 1 HD.it", "rai1"},
+		{"TV8 HD.it", "tv8"},
+		{"NOVE HD", "nove"},
+		{"NOVE HD.it", "nove"},
+		{"20Mediaset HD.it", "20mediaset"},
+		{"Italia 1 Full HD", "italia1"},
+		{"Italia 1 4K", "italia1"},
+
+		// Channels that legitimately contain "HD" — no stripping unless trailing.
+		{"HD", "hd"},
+		{"HD Network", "hdnetwork"},
+		{"Sky HD Italia", "skyhditalia"},
+
+		{"", ""},
+		{"   ", ""},
+		{".com", ""},
+		{"Foo.Bar", "foobar"},                  // ".bar" is not a known suffix
+		{"foo.it.something", "fooitsomething"}, // mid-string ".it" is NOT stripped — only trailing suffix
+		{"Caffè 24", "caffè24"},                // unicode letter survives
+	}
+
+	for _, c := range cases {
+		if got := normalizeChannelID(c.in); got != c.want {
+			t.Errorf("normalizeChannelID(%q) = %q, want %q", c.in, got, c.want)
+		}
+	}
+}
+
+func TestBuildIDMap(t *testing.T) {
+	ids := []string{"Italia 1", "Rai 1", "Italia 1", "", "  "}
+	m := buildIDMap(ids)
+
+	if got, want := m["italia1"], "Italia 1"; got != want {
+		t.Errorf("italia1 -> %q, want %q", got, want)
+	}
+	if got, want := m["rai1"], "Rai 1"; got != want {
+		t.Errorf("rai1 -> %q, want %q", got, want)
+	}
+	if len(m) != 2 {
+		t.Errorf("len(m) = %d, want 2 (empties dropped, dupes deduped)", len(m))
+	}
+
+	// First occurrence wins for the canonical mapping.
+	first := buildIDMap([]string{"Italia 1", "italia 1"})
+	if first["italia1"] != "Italia 1" {
+		t.Errorf("first-wins broken: got %q", first["italia1"])
+	}
+}