package app

import (
	"os"
	"strings"
)

func writeLinesFile(path string, lines []string) error {
	if len(lines) == 0 {
		return os.WriteFile(path, []byte{}, 0o644)
	}
	payload := strings.Join(lines, "\n")
	if !strings.HasSuffix(payload, "\n") {
		payload += "\n"
	}
	return os.WriteFile(path, []byte(payload), 0o644)
}

func readLinesFile(path string) ([]string, error) {
	data, err := os.ReadFile(path)
	if err != nil {
		return nil, err
	}
	lines := make([]string, 0, 64)
	for _, raw := range strings.Split(string(data), "\n") {
		ln := strings.TrimSpace(raw)
		if ln == "" {
			continue
		}
		lines = append(lines, ln)
	}
	return lines, nil
}

func cacheCopyOrEmpty(src, dst string) error {
	if err := copyFile(src, dst); err == nil {
		return nil
	}
	return os.WriteFile(dst, []byte{}, 0o644)
}

func fileExists(path string) bool {
	info, err := os.Stat(path)
	if err != nil {
		return false
	}
	return !info.IsDir()
}