package fstore

import (
	"path/filepath"
	"strconv"

	"git.crumpington.com/public/jldb/lib/errs"
)

func filesRootPath(rootDir string) string {
	return filepath.Clean(filepath.Join(rootDir, "files"))
}

func repDirPath(rootDir string) string {
	return filepath.Clean(filepath.Join(rootDir, "rep"))
}

func tempDirPath(rootDir string) string {
	return filepath.Clean(filepath.Join(rootDir, "tmp"))
}

func tempFilePath(inDir string, id uint64) string {
	return filepath.Join(inDir, strconv.FormatUint(id, 10))
}

func validatePath(p string) error {
	if len(p) == 0 {
		return errs.InvalidPath.WithMsg("empty path")
	}

	if p[0] != '/' {
		return errs.InvalidPath.WithMsg("path must be absolute")
	}

	for _, c := range p {
		switch c {
		case '/', '-', '_', '.':
			continue
		default:
		}

		if c >= 'a' && c <= 'z' {
			continue
		}

		if c >= '0' && c <= '9' {
			continue
		}

		return errs.InvalidPath.WithMsg("invalid character in path: %s", string([]rune{c}))
	}
	return nil
}

func cleanPath(p string) string {
	if len(p) == 0 {
		return "/"
	}

	if p[0] != '/' {
		p = "/" + p
	}
	return filepath.Clean(p)
}