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require("colors");

var path = require("path");

var diff = require("diff");

var run = require(path.join(__dirname, "run-solution"));

module.exports = function(solution, attempt, cb) {

run(solution, function(err, solutionResult) {

if(err) {

console.error(err);

return cb(false);

}

run(attempt, function(err, attemptResult) {

if(err && err.code !== 8) {

console.error(err);

return cb(false);

}

if(solutionResult === attemptResult) {

return cb(true);

}

cb(false, {

solution: solutionResult,

attempt: err || attemptResult,

diff: generateDiff(solutionResult, attemptResult)

});

});

});

}

function generateDiff(solution, attempt) {

var parts = diff.diffChars(solution, attempt);

var result = "";

parts.forEach(function(part) {

if(part.added) {

result += part.value["bgRed"];

} else if(part.removed) {

result += part.value["bgGreen"];

} else {

result += part.value;

}

});

return result;

}