package erf

import (
	"bytes"
	"testing"
)

func TestArchiveRoundTrip(t *testing.T) {
	archive := New("MOD ", []Resource{
		{Name: "module", Type: 0x07DE, Data: []byte("ifo")},
		{Name: "start", Type: 0x07DC, Data: []byte("are")},
	})

	var buf bytes.Buffer
	if err := Write(&buf, archive); err != nil {
		t.Fatalf("write: %v", err)
	}

	decoded, err := Read(bytes.NewReader(buf.Bytes()))
	if err != nil {
		t.Fatalf("read: %v", err)
	}

	if len(decoded.Resources) != 2 {
		t.Fatalf("expected 2 resources, got %d", len(decoded.Resources))
	}
	if decoded.Resources[0].Name != "module" || string(decoded.Resources[0].Data) != "ifo" {
		t.Fatalf("unexpected first resource: %#v", decoded.Resources[0])
	}
}

func TestExtensionMappingsKeep2DAAndTLKDistinct(t *testing.T) {
	resourceType, ok := ResourceTypeForExtension("2da")
	if !ok {
		t.Fatal("expected 2da resource type")
	}
	if resourceType != 0x07E1 {
		t.Fatalf("expected 2da type 0x07E1, got 0x%04X", resourceType)
	}
	extension, ok := ExtensionForResourceType(resourceType)
	if !ok {
		t.Fatal("expected canonical extension for 2da type")
	}
	if extension != "2da" {
		t.Fatalf("expected 2da extension, got %q", extension)
	}

	tlkType, ok := ResourceTypeForExtension("tlk")
	if !ok {
		t.Fatal("expected tlk resource type")
	}
	if tlkType != 0x07E2 {
		t.Fatalf("expected tlk type 0x07E2, got 0x%04X", tlkType)
	}
	if tlkType == resourceType {
		t.Fatal("expected 2da and tlk resource types to stay distinct")
	}
}