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

package compression

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

type flateDecompressor struct{ *BaseDecompressor }

func NewFlateDecompressor() *flateDecompressor {
	return &flateDecompressor{NewBaseDecompressor("flate", []string{}, []string{".deflate", ".fl"})}
}

// ✅ Oprava: flate.NewReader returns io.ReadCloser, ale my returnsme io.Reader
func (f *flateDecompressor) Reader(r io.Reader) (io.ReadCloser, error) {
	return flate.NewReader(r), nil
}

type flateCompressor struct {
	name  string
	level int
}

func NewFlateCompressor() *flateCompressor {
	return &flateCompressor{name: "flate", level: flate.DefaultCompression}
}

func NewFlateCompressorWithLevel(level int) (*flateCompressor, error) {
	if level < flate.HuffmanOnly || level > flate.BestCompression {
		return nil, fmt.Errorf("invalid compression level: %d (must be %d-%d)",
			level, flate.HuffmanOnly, flate.BestCompression)
	}
	return &flateCompressor{name: "flate", level: level}, nil
}

func (f *flateCompressor) Name() string { return f.name }
func (f *flateCompressor) Writer(w io.Writer) (io.WriteCloser, error) {
	return flate.NewWriter(w, f.level)
}

func init() { Register(NewFlateDecompressor()) }