'use strict';
const path = require('path');
const fs = require('fs');
const {promisify} = require('util');
const pLocate = require('p-locate');

const fsStat = promisify(fs.stat);
const fsLStat = promisify(fs.lstat);

const typeMappings = {
    directory: 'isDirectory',
    file: 'isFile'
};

function checkType({type}) {
    if (type in typeMappings) {
        return;
    }

    throw new Error(`Invalid type specified: ${type}`);
}

const matchType = (type, stat) => type === undefined || stat[typeMappings[type]]();

module.exports = async (paths, options) => {
    options = {
        cwd: process.cwd(),
        type: 'file',
        allowSymlinks: true,
        ...options
    };

    checkType(options);

    const statFn = options.allowSymlinks ? fsStat : fsLStat;

    return pLocate(paths, async path_ => {
        try {
            const stat = await statFn(path.resolve(options.cwd, path_));
            return matchType(options.type, stat);
        } catch {
            return false;
        }
    }, options);
};

module.exports.sync = (paths, options) => {
    options = {
        cwd: process.cwd(),
        allowSymlinks: true,
        type: 'file',
        ...options
    };

    checkType(options);

    const statFn = options.allowSymlinks ? fs.statSync : fs.lstatSync;

    for (const path_ of paths) {
        try {
            const stat = statFn(path.resolve(options.cwd, path_));

            if (matchType(options.type, stat)) {
                return path_;
            }
        } catch {}
    }
};