package logger

import (
	"io"
	"log/slog"
	"os"
	"sync"
)

type fileRouter struct {
	mu            sync.RWMutex
	handlers      map[string]slog.Handler // map[filePath]handler
	files         map[string]*os.File     // map[filePath]*os.File to close later
	baseDir       string
	rotationDays  int
	id            string
	dirTimeLayout string // "2006-01-02" - daily dirs
}

// prefixWriter - writes a prefix at the start of each new line.
// It is safe for concurrent use.
type prefixWriter struct {
	inner     io.Writer
	prefix    []byte
	mu        sync.Mutex
	startLine bool
}