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var fs = require('fs')

var exec = require('child_process').exec

/**

* @param {!string} filePath

* @return {Promise}

*/

function exists (filePath) {

return new Promise(function (resolve, reject) {

fs.stat(filePath, function (err, d) {

if (err) {

resolve(false)

}

resolve(true)

})

})

}

/**

* @param {!string} filePath

* @return {Promise}

*/

function executeSolution (filePath) {

return new Promise(function (resolve, reject) {

exec('node "' + filePath + '"', function (err, stdout, stderr) {

if (err) {

return reject(err)

}

return resolve(stdout)

})

})

}

/**

* @param {string} solutionPath

* @param {!{__: function(string, object)}} i18n

* @param {function} cb

*/

module.exports = function (solutionPath, i18n, cb) {

exists(solutionPath).then(function (solutionExists) {

if (!solutionExists) {

throw new Error(i18n.__('error.exercise.missing_file', { exerciseFile: solutionPath }))

}

return executeSolution(solutionPath)

}).then(function (stdout) {

cb(null, stdout)

}).catch(cb)

}