package util

import (
	"fmt"
	"os"
	"strings"
)

func DoesFileExist(filepath string) bool {
	_, err := os.Stat(filepath)
	return !os.IsNotExist(err)
}

func CreateDirIfNotExists(dirpath string) error {
	if _, err := os.Stat(dirpath); os.IsNotExist(err) {
		createErr := os.MkdirAll(dirpath, 0o777)
		if createErr != nil {
			return createErr
		}
	}
	return nil
}

func FindFile(explicitPath string, locations, endings []string) (string, error) {
	if explicitPath != "" {
		if !DoesFileExist(explicitPath) {
			return "", fmt.Errorf("file %s not found", explicitPath)
		}
		return explicitPath, nil
	}

	notFound := []string{}

	for _, f := range locations {
		if endings != nil {
			for _, t := range endings {
				fpath := f + "." + t

				if DoesFileExist(fpath) {
					return fpath, nil
				} else {
					notFound = append(notFound, fpath)
				}
			}
		} else {
			if DoesFileExist(f) {
				return f, nil
			} else {
				notFound = append(notFound, f)
			}
		}
	}
	return "", fmt.Errorf("none of the following files found: %s",
		strings.Join(notFound, "; "))
}