'use strict';
const path = require('path');
const locatePath = require('locate-path');
const pathExists = require('path-exists');

const stop = Symbol('findUp.stop');

module.exports = async (name, options = {}) => {
    let directory = path.resolve(options.cwd || '');
    const {root} = path.parse(directory);
    const paths = [].concat(name);

    const runMatcher = async locateOptions => {
        if (typeof name !== 'function') {
            return locatePath(paths, locateOptions);
        }

        const foundPath = await name(locateOptions.cwd);
        if (typeof foundPath === 'string') {
            return locatePath([foundPath], locateOptions);
        }

        return foundPath;
    };

    // eslint-disable-next-line no-constant-condition
    while (true) {
        // eslint-disable-next-line no-await-in-loop
        const foundPath = await runMatcher({...options, cwd: directory});

        if (foundPath === stop) {
            return;
        }

        if (foundPath) {
            return path.resolve(directory, foundPath);
        }

        if (directory === root) {
            return;
        }

        directory = path.dirname(directory);
    }
};

module.exports.sync = (name, options = {}) => {
    let directory = path.resolve(options.cwd || '');
    const {root} = path.parse(directory);
    const paths = [].concat(name);

    const runMatcher = locateOptions => {
        if (typeof name !== 'function') {
            return locatePath.sync(paths, locateOptions);
        }

        const foundPath = name(locateOptions.cwd);
        if (typeof foundPath === 'string') {
            return locatePath.sync([foundPath], locateOptions);
        }

        return foundPath;
    };

    // eslint-disable-next-line no-constant-condition
    while (true) {
        const foundPath = runMatcher({...options, cwd: directory});

        if (foundPath === stop) {
            return;
        }

        if (foundPath) {
            return path.resolve(directory, foundPath);
        }

        if (directory === root) {
            return;
        }

        directory = path.dirname(directory);
    }
};

module.exports.exists = pathExists;

module.exports.sync.exists = pathExists.sync;

module.exports.stop = stop;