// tofuproxy -- flexible HTTP/HTTPS proxy, TLS terminator, X.509 TOFU
//              manager, WARC/geminispace browser
// Copyright (C) 2021-2024 Sergey Matveev <stargrave@stargrave.org>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 3 of the License.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package warc

import (
	"fmt"
	"io"
	"path"
)

var UnZSTDPath = "/home/stargrave/work/tofuproxy/cmd/zstd/unzstd"

type Offset struct {
	Z int64 // Compressed frame size
	U int64 // Its uncompressed size
}

type RawRecordReader interface {
	io.ReadCloser
	Offsets() []Offset
}

func Open(warcPath string, offsets []Offset, offset int64) (RawRecordReader, error) {
	ext := path.Ext(warcPath)
	switch ext {
	case ".warc":
		return NewUncompressedReader(warcPath, offset)
	case ".gz":
		return NewGZIPReader(warcPath, offsets, offset)
	case ".zst":
		return NewCompressedReader(warcPath, UnZSTDPath, offsets, offset)
	}
	return nil, fmt.Errorf("unknown extension: %s", ext)
}