package proxyserver

import (
	"os"
	"path/filepath"

	"albedo/cli/internal/config"
)

// RequestLog replaces older request lines once proxy.log reaches 8 MiB.
// log.Logger serializes calls to Write.
type RequestLog struct{ *os.File }

func OpenLog() (*RequestLog, error) {
	file, err := os.OpenFile(filepath.Join(config.HomeDir(), "proxy.log"), os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0o600)
	if err != nil {
		return nil, err
	}
	return &RequestLog{file}, nil
}

func (l *RequestLog) Write(data []byte) (int, error) {
	info, err := l.Stat()
	if err != nil {
		return 0, err
	}
	if info.Size()+int64(len(data)) > 8<<20 {
		if err := l.Truncate(0); err != nil {
			return 0, err
		}
	}
	return l.File.Write(data)
}