package video

import "testing"

func TestPatterns(t *testing.T) {
	got := Patterns()
	if len(got) == 0 {
		t.Fatal("Patterns returned no video patterns")
	}

	seen := make(map[string]struct{}, len(got))
	for i, pattern := range got {
		if pattern.Name == "" {
			t.Fatalf("pattern %d has an empty name", i)
		}
		if pattern.Description == "" {
			t.Fatalf("pattern %q has an empty description", pattern.Name)
		}
		if !HasPattern(pattern.Name) {
			t.Fatalf("Patterns returned %q, but HasPattern rejected it", pattern.Name)
		}
		if _, exists := seen[pattern.Name]; exists {
			t.Fatalf("duplicate pattern name %q", pattern.Name)
		}
		seen[pattern.Name] = struct{}{}
		if i > 0 && got[i-1].Name >= pattern.Name {
			t.Fatalf("patterns are not sorted: %q appears before %q", got[i-1].Name, pattern.Name)
		}
	}
}

func TestHasPatternRejectsUnknownName(t *testing.T) {
	if HasPattern("not-a-pattern") {
		t.Fatal("HasPattern accepted an unknown pattern")
	}
}

func TestPatternRegistryKeysMatchNames(t *testing.T) {
	for name, pattern := range patterns {
		if pattern.Name != name {
			t.Errorf("pattern map key %q does not match pattern name %q", name, pattern.Name)
		}
		if pattern.kernelPath == "" {
			t.Errorf("pattern %q has an empty kernel path", name)
		}
	}
}