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define(['PrairieRandom', 'PrairieGeom', 'QServer'], function (PrairieRandom, PrairieGeom, QServer) {
  var server = new QServer();

  server.getData = function (vid) {
    var rand = new PrairieRandom.RandomGenerator(vid);

    // question parameters
    var ux = rand.randInt(5, 10);
    var uy = rand.randInt(5, 10);
    var vx = rand.randInt(5, 10);
    var vy = rand.randInt(5, 10);
    var params = {
      ux: ux,
      uy: uy,
      vx: vx,
      vy: vy,
    };

    // correct answer to the question
    var wx = ux + vx;
    var wy = uy + vy;
    var trueAnswer = {
      wx: wx,
      wy: wy,
    };

    // OPTIONAL, if missing then
    // relTol = 0.01 and absTol = 1e-8 will be used
    var options = {
      relTol: 0.01, // relative tolerance for checking answers (OPTIONAL)
      absTol: 1e-8, // absolute tolerance (OPTIONAL)
    };

    // all the question data together
    var questionData = {
      params: params,
      trueAnswer: trueAnswer,
      options: options, // OPTIONAL
    };
    return questionData;
  };

  // OPTIONAL gradeAnswer() function
  // if not present, then the submittedAnswer will be automatically checked against the trueAnswer
  server.gradeAnswer = function (vid, params, trueAnswer, submittedAnswer, options) {
    var score = 1;
    var feedback = { wx: '', wy: '' };
    if (
      !PrairieGeom.checkEqual(trueAnswer.wx, submittedAnswer.wx, options.relTol, options.absTol)
    ) {
      score = 0;
      feedback.wx = 'The first component $w_x$ is incorrect.';
    }
    if (
      !PrairieGeom.checkEqual(trueAnswer.wy, submittedAnswer.wy, options.relTol, options.absTol)
    ) {
      score = 0;
      feedback.wy = 'The second component $w_y$ is incorrect.';
    }
    return { score: score, feedback: feedback };
  };

  return server;
});