package instructions

import (
	"os"
	"path/filepath"
	"strings"
)

const FileName = ".dirmd"

func Read(rootDir string) (string, error) {
	path := filepath.Join(rootDir, FileName)
	data, err := os.ReadFile(path)
	if err != nil {
		if os.IsNotExist(err) {
			return "", nil
		}
		return "", err
	}
	return string(data), nil
}

func Format(content string) string {
	if content == "" {
		return ""
	}
	content = strings.TrimSpace(content)
	if content == "" {
		return ""
	}
	lines := strings.Split(content, "\n")
	var sb strings.Builder
	sb.WriteString("> Instructions:\n")
	for _, line := range lines {
		sb.WriteString("> ")
		sb.WriteString(line)
		sb.WriteString("\n")
	}
	sb.WriteString("\n")
	return sb.String()
}