var assert = require('chai').assert;
var expect = require('chai').expect;

var bac = require('../src/bac.js');

describe('BAC', function() {

  before(function(done) {
    done();
  });

  describe('Helpers', function() {
    it('should convert 128 lbs pounds to ~58 kgs', function(done) {

      var weightInPounds = 128;
      var weightInKgs = bac.poundsToKgs(weightInPounds);

      assert.equal(weightInPounds, 128);
      assert.equal(weightInKgs, 58.06041912365055);

      done();
    });

    it('should accurately accurately calculate a 128 lbs males body water percentage', function(done) {

      var weightInPounds = 128;
      var isMale = true;

      var weightInKgs = bac.poundsToKgs(weightInPounds);
      var waterPercentage = bac.waterPercentage(isMale);
      var totalBodyWaterPercentage = bac.totalBodyWaterPercentage(weightInKgs, waterPercentage);

      assert.equal(totalBodyWaterPercentage, 33.67504309171731);

      done();
    });

    it('should accurately accurately calculate a 128 lbs females body water percentage', function(done) {

      var weightInPounds = 128;
      var isMale = false;

      var weightInKgs = bac.poundsToKgs(weightInPounds);
      var waterPercentage = bac.waterPercentage(isMale);
      var totalBodyWaterPercentage = bac.totalBodyWaterPercentage(weightInKgs, waterPercentage);

      assert.equal(totalBodyWaterPercentage, 28.449605370588767);

      done();
    });
  });

  describe('Exceptions', function() {

      it('should throw exception when out of bounds', function(done) {

        expect(function() {
          bac.bacAfterElapsedTime(.2, 2, 0.01);
        }).to.throw('metabolism rate out of bounds');

        expect(function() {
          bac.bacAfterElapsedTime(.2, 2, 0.021);
        }).to.throw('metabolism rate out of bounds');

        done();
      });
    }),

    describe('Calculations', function() {

      it('should accurately calculate one beer for a 128 lbs male over an hour', function(done) {

        var weightInPounds = 128;
        var totalTimeInHours = 1;
        var isMale = true;
        var metabolism = .012;

        var beers = [];
        beers.push({
          abv: 0.045,
          ounces: 12
        });

        var weightInKgs = bac.poundsToKgs(weightInPounds);
        var waterPercentage = bac.waterPercentage(isMale);
        var totalBodyWaterPercentage = bac.totalBodyWaterPercentage(weightInKgs, waterPercentage);

        var bacTotalTheoreticalPeak = bac.theoreticalBacPeak(totalBodyWaterPercentage, beers);
        assert.equal(bacTotalTheoreticalPeak, 0.030192111031034485);

        var bacAfterElapsedTime = bac.bacAfterElapsedTime(bacTotalTheoreticalPeak, totalTimeInHours, metabolism);
        assert.equal(bacAfterElapsedTime, 0.018192111031034484);

        done();
      });

      it('should accurately calculate two beers for a 128 lbs male over an hour', function(done) {

        var weightInPounds = 128;
        var totalTimeInHours = 1;
        var isMale = true;
        var metabolism = .012;

        var beers = [];
        beers.push({
          abv: 0.045,
          ounces: 12
        });
        beers.push({
          abv: 0.045,
          ounces: 12
        });

        var weightInKgs = bac.poundsToKgs(weightInPounds);
        var waterPercentage = bac.waterPercentage(isMale);
        var totalBodyWaterPercentage = bac.totalBodyWaterPercentage(weightInKgs, waterPercentage);

        var bacTotalTheoreticalPeak = bac.theoreticalBacPeak(totalBodyWaterPercentage, beers);
        assert.equal(bacTotalTheoreticalPeak, 0.06038422206206897);

        var bacAfterElapsedTime = bac.bacAfterElapsedTime(bacTotalTheoreticalPeak, totalTimeInHours, metabolism);
        assert.equal(bacAfterElapsedTime, 0.048384222062068966);

        done();
      });

      it('should accurately calculate two beers for a 128 lbs male over two hours', function(done) {

        var weightInPounds = 128;
        var totalTimeInHours = 2;
        var isMale = true;
        var metabolism = .012;

        var beers = [];
        beers.push({
          abv: 0.045,
          ounces: 12
        });
        beers.push({
          abv: 0.045,
          ounces: 12
        });

        var weightInKgs = bac.poundsToKgs(weightInPounds);
        var waterPercentage = bac.waterPercentage(isMale);
        var totalBodyWaterPercentage = bac.totalBodyWaterPercentage(weightInKgs, waterPercentage);

        var bacTotalTheoreticalPeak = bac.theoreticalBacPeak(totalBodyWaterPercentage, beers);
        assert.equal(bacTotalTheoreticalPeak, 0.06038422206206897);

        var bacAfterElapsedTime = bac.bacAfterElapsedTime(bacTotalTheoreticalPeak, totalTimeInHours, metabolism);
        assert.equal(bacAfterElapsedTime, 0.03638422206206897);

        done();
      });

      it('should accurately calculate one beer for a 128 lbs female over an hour', function(done) {

        var weightInPounds = 128;
        var totalTimeInHours = 1;
        var isMale = false;
        var metabolism = .012;

        var beers = [];
        beers.push({
          abv: 0.045,
          ounces: 12
        });

        var weightInKgs = bac.poundsToKgs(weightInPounds);
        var waterPercentage = bac.waterPercentage(isMale);
        var totalBodyWaterPercentage = bac.totalBodyWaterPercentage(weightInKgs, waterPercentage);

        var bacTotalTheoreticalPeak = bac.theoreticalBacPeak(totalBodyWaterPercentage, beers);
        assert.equal(bacTotalTheoreticalPeak, 0.035737600812244905);

        var bacAfterElapsedTime = bac.bacAfterElapsedTime(bacTotalTheoreticalPeak, totalTimeInHours, metabolism);
        assert.equal(bacAfterElapsedTime, 0.023737600812244904);

        done();
      });

      it('should accurately calculate two beers for a 128 lbs female over an hour', function(done) {

        var weightInPounds = 128;
        var totalTimeInHours = 1;
        var isMale = false;
        var metabolism = .012;

        var beers = [];
        beers.push({
          abv: 0.045,
          ounces: 12
        });
        beers.push({
          abv: 0.045,
          ounces: 12
        });

        var weightInKgs = bac.poundsToKgs(weightInPounds);
        var waterPercentage = bac.waterPercentage(isMale);
        var totalBodyWaterPercentage = bac.totalBodyWaterPercentage(weightInKgs, waterPercentage);

        var bacTotalTheoreticalPeak = bac.theoreticalBacPeak(totalBodyWaterPercentage, beers);
        assert.equal(bacTotalTheoreticalPeak, 0.07147520162448981);

        var bacAfterElapsedTime = bac.bacAfterElapsedTime(bacTotalTheoreticalPeak, totalTimeInHours, metabolism);
        assert.equal(bacAfterElapsedTime, 0.05947520162448981);

        done();
      });

      it('should accurately calculate two beers for a 128 lbs female over two hours', function(done) {

        var weightInPounds = 128;
        var totalTimeInHours = 2;
        var isMale = false;
        var metabolism = .012;

        var beers = [];
        beers.push({
          abv: 0.045,
          ounces: 12
        });
        beers.push({
          abv: 0.045,
          ounces: 12
        });

        var weightInKgs = bac.poundsToKgs(weightInPounds);
        var waterPercentage = bac.waterPercentage(isMale);
        var totalBodyWaterPercentage = bac.totalBodyWaterPercentage(weightInKgs, waterPercentage);

        var bacTotalTheoreticalPeak = bac.theoreticalBacPeak(totalBodyWaterPercentage, beers);
        assert.equal(bacTotalTheoreticalPeak, 0.07147520162448981);

        var bacAfterElapsedTime = bac.bacAfterElapsedTime(bacTotalTheoreticalPeak, totalTimeInHours, metabolism);
        assert.equal(bacAfterElapsedTime, 0.04747520162448981);

        done();
      });

      it('should accurately calculate three big beers for a 180 lbs male over two hours', function(done) {

        var weightInPounds = 180;
        var totalTimeInHours = 2;
        var isMale = true;
        var metabolism = .012;

        var beers = [];
        beers.push({
          abv: 0.07,
          ounces: 12
        });
        beers.push({
          abv: 0.07,
          ounces: 12
        });
        beers.push({
          abv: 0.07,
          ounces: 12
        });

        var weightInKgs = bac.poundsToKgs(weightInPounds);
        var waterPercentage = bac.waterPercentage(isMale);
        var totalBodyWaterPercentage = bac.totalBodyWaterPercentage(weightInKgs, waterPercentage);

        var bacTotalTheoreticalPeak = bac.theoreticalBacPeak(totalBodyWaterPercentage, beers);
        assert.equal(bacTotalTheoreticalPeak, 0.10019307956965522);

        var bacAfterElapsedTime = bac.bacAfterElapsedTime(bacTotalTheoreticalPeak, totalTimeInHours, metabolism);
        assert.equal(bacAfterElapsedTime, 0.07619307956965521);

        done();
      });
    });
});