package tools

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

func resolvePath(baseDir, path string) (string, error) {
	if path == "" {
		path = "."
	}
	if filepath.IsAbs(path) {
		return "", fmt.Errorf("absolute paths are not allowed; use a path relative to the project directory")
	}
	resolved := filepath.Clean(filepath.Join(baseDir, path))
	if !isWithinDir(resolved, baseDir) {
		return "", fmt.Errorf("path escapes the project directory: %s", path)
	}
	return resolved, nil
}

func isWithinDir(path, dir string) bool {
	rel, err := filepath.Rel(dir, path)
	if err != nil {
		return false
	}
	if rel == ".." || strings.HasPrefix(rel, ".."+string(filepath.Separator)) {
		return false
	}
	return true
}