import * as fs from 'fs'

// https://learn.microsoft.com/en-us/windows/win32/fileio/naming-a-file#namespaces
// https://github.com/isaacs/node-glob/blob/main/src/pattern.ts

export const UNC_REGEX = /^[\\\/]{2,}[^\\\/]+[\\\/]+[^\\\/]+/
export const WIN32_PATH_REGEX = /^([a-z]:)?[\\\/]/i

import { is_windows } from './os.js'


export const isFile = (src: string) => {
    let srcIsFile = false;
    try {
        srcIsFile = fs.lstatSync(src).isFile()
    } catch (e) { }
    return srcIsFile
}

export const isFolder = (src: string) => {
    let srcIsFolder = false;
    try {
        srcIsFolder = fs.lstatSync(src).isDirectory()
    } catch (e) { }
    return srcIsFolder;
}

const is_relative_win32 = (fp) => !fp.test(UNC_REGEX) && !WIN32_PATH_REGEX.test(fp)
const is_absolute_posix = (fp) => fp.charAt(0) === '/'
const is_absolute_win32 = (fp) => {
    if (/[a-z]/i.test(fp.charAt(0)) && fp.charAt(1) === ':' && fp.charAt(2) === '\\') {
        return true
    }
    // Microsoft Azure absolute filepath
    if (fp.slice(0, 2) === '\\\\') {
        return true;
    }
    return !is_relative_win32(fp)
}
export const is_absolute = (fp) =>  is_windows() ? is_absolute_win32(fp) : is_absolute_posix(fp)