refactor: Decompose index func

internal/suffix/remove.go

@@ -0,0 +1,41 @@
+package suffix
+
+import (
+	"strings"
+
+	"github.com/pojntfx/stfs/pkg/config"
+)
+
+func RemoveSuffix(name string, compressionFormat string, encryptionFormat string) (string, error) {
+	switch encryptionFormat {
+	case config.EncryptionFormatAgeKey:
+		name = strings.TrimSuffix(name, EncryptionFormatAgeSuffix)
+	case config.EncryptionFormatPGPKey:
+		name = strings.TrimSuffix(name, EncryptionFormatPGPSuffix)
+	case config.NoneKey:
+	default:
+		return "", config.ErrUnsupportedEncryptionFormat
+	}
+
+	switch compressionFormat {
+	case config.CompressionFormatGZipKey:
+		fallthrough
+	case config.CompressionFormatParallelGZipKey:
+		name = strings.TrimSuffix(name, CompressionFormatGZipSuffix)
+	case config.CompressionFormatLZ4Key:
+		name = strings.TrimSuffix(name, CompressionFormatLZ4Suffix)
+	case config.CompressionFormatZStandardKey:
+		name = strings.TrimSuffix(name, CompressionFormatZStandardSuffix)
+	case config.CompressionFormatBrotliKey:
+		name = strings.TrimSuffix(name, CompressionFormatBrotliSuffix)
+	case config.CompressionFormatBzip2Key:
+		fallthrough
+	case config.CompressionFormatBzip2ParallelKey:
+		name = strings.TrimSuffix(name, CompressionFormatBzip2Suffix)
+	case config.NoneKey:
+	default:
+		return "", config.ErrUnsupportedCompressionFormat
+	}
+
+	return name, nil
+}