package frp

import (
	"os"
	"strings"
)

func ReadLogTail(path string, limit int) ([]string, error) {
	if limit <= 0 {
		limit = 100
	}
	data, err := os.ReadFile(path)
	if err != nil {
		if os.IsNotExist(err) {
			return []string{}, nil
		}
		return nil, err
	}
	lines := strings.Split(strings.TrimRight(string(data), "\n"), "\n")
	if len(lines) == 0 || (len(lines) == 1 && lines[0] == "") {
		return []string{}, nil
	}
	if len(lines) > limit {
		lines = lines[len(lines)-limit:]
	}
	return lines, nil
}