//go:build linux || freebsd
// +build linux freebsd

package archive

import (
	"compress/gzip"
	"fmt"
	"io"
)

type tarGzExtractor struct {
	*BaseExtractor
	tar *tarExtractor
}

func NewTarGzExtractor() *tarGzExtractor {
	return &tarGzExtractor{
		BaseExtractor: NewBaseExtractor("tar.gz", []string{".tar.gz", ".tgz"}),
		tar:           NewTarExtractor(),
	}
}

// Extract extracts a tar.gz archive into destDir
func (t *tarGzExtractor) Extract(r io.Reader, destDir string) error {
	// Step 1: Create gzip reader for decompression
	gzr, err := gzip.NewReader(r)
	if err != nil {
		return fmt.Errorf("failed to create gzip reader: %w", err)
	}
	defer func() {
		if cerr := gzr.Close(); cerr != nil && err == nil {
			err = cerr
		}
	}()

	// Step 2: Extract tar from decompressed stream
	// gzr implements io.Reader that returns DECOMPRESSED data
	return t.tar.Extract(gzr, destDir)
}

func init() { Register(NewTarGzExtractor()) }