package rep

import (
	"encoding/binary"
	"encoding/json"
	"net"
	"path/filepath"
	"time"

	"git.crumpington.com/public/jldb/lib/errs"
)

// ----------------------------------------------------------------------------

func lockFilePath(rootDir string) string {
	return filepath.Join(rootDir, "lock")
}

func walRootDir(rootDir string) string {
	return filepath.Join(rootDir, "wal")
}

func stateFilePath(rootDir string) string {
	return filepath.Join(rootDir, "state")
}

// ----------------------------------------------------------------------------

func sendJSON(
	item any,
	conn net.Conn,
	timeout time.Duration,
) error {

	buf := bufPoolGet()
	defer bufPoolPut(buf)

	if err := json.NewEncoder(buf).Encode(item); err != nil {
		return errs.Unexpected.WithErr(err)
	}

	sizeBuf := make([]byte, 2)
	binary.LittleEndian.PutUint16(sizeBuf, uint16(buf.Len()))

	conn.SetWriteDeadline(time.Now().Add(timeout))
	buffers := net.Buffers{sizeBuf, buf.Bytes()}
	if _, err := buffers.WriteTo(conn); err != nil {
		return errs.IO.WithErr(err)
	}

	return nil
}