// This test is for node JS

var assert = require('assert');
var a = require("../src/formula_evaluator.js");
describe('Testing Unit', function () {
  it('should equal 2 to check a number', function () {
    assert.equal(a.lex("2").toPostfix().postfixEval(), 2);
  });
  it('checks a math function', function () {
    assert.equal(a.lex("tan(180)").toPostfix().postfixEval(), 0);
  });
  it('checks a parenthesis less function', function () {
    assert.equal(a.lex("sin180").toPostfix().postfixEval(), 0);
  });
  it('checks a parenthesis less function after a space', function () {
    assert.equal(a.lex("cos 180").toPostfix().postfixEval(), -1);
  });
  it('checks a parenthesis less function after multiple spaces', function () {
    assert.equal(a.lex("cos   180").toPostfix().postfixEval(), -1);
  });
  it('checks consecutive operator', function () {
    assert.equal(a.lex("0+-2").toPostfix().postfixEval(), -2);
  });
  it('checks ^ operator', function () {
    assert.equal(a.lex("2^2").toPostfix().postfixEval(), 4);
  });
  it('checks when * is omitted before parenthesis and after', function () {
    assert.equal(a.lex("2(7-4)3").toPostfix().postfixEval(), 18);
  });
  it('checks multiplication and exponential in series', function () {
    assert.equal(a.lex("2*7^2").toPostfix().postfixEval(), 98);
  });
  it('checks exponential and multiplication in series', function () {
    assert.equal(a.lex("2^5*2").toPostfix().postfixEval(), 64);
  });
  it('-3^2=-9', function () {
    assert.equal(a.lex("-3^2").toPostfix().postfixEval(), -9);
  });
  it('3^2-2^2=5', function () {
    assert.equal(a.lex("3^2-2^2").toPostfix().postfixEval(), 5);

    assert.equal(
      Math.round((a.eval("(4-(2-1)^2)^.5") + Number.EPSILON) * 100) / 100,
      Math.round((Math.sqrt(3) + Number.EPSILON) * 100) / 100
    )
  });

  it('formula test', function () {
    assert.equal(a.lex("2").toPostfix().formulaEval(), 2);
  });
  it('formula test', function () {
    assert.equal(a.lex("sinpi").toPostfix().formulaEval(), "sin(π)");
  });
  it('formula test', function () {
    assert.equal(a.lex("cos pi").toPostfix().formulaEval(), "cos(π)");
  });
  it('formula test', function () {
    assert.equal(a.lex("tan(pi)").toPostfix().formulaEval(), "tan(π)");
  });
  it('formula test', function () {
    assert.equal(a.lex("2(7-4)3").toPostfix().formulaEval(), "(2×(7-4))×3");
  });
  it('test to check the bug when number contains decimal', function () {
    assert.equal(a.lex("int2.3").toPostfix().postfixEval(), "2");
  });
  it('test to check auto correct of parenthesis mismatch if opening>closing', function () {
    assert.equal(a.lex("(2+(3-4").toPostfix().postfixEval(), "1");
  });
  it('check for negative of a constant', function () {
    assert.equal(a.lex("-e").toPostfix().postfixEval(), -Math.E);
  });
  it('check for constant inside Sigma', function () {
    assert.equal(a.lex("Sigma1,3,2", [{ type: 3, preced: 0, ev: "x", show: "x", token: "x" }]).toPostfix().postfixEval({ x: 2 }), 6);
  });
  it('check when arithmetic and n are present inside sigma', function () {
    assert.equal(a.lex("Sigma1,2,n").toPostfix().postfixEval(), 3);
  });
  it(' should check when 4C3', function () {
    assert.equal(a.lex("4C3").toPostfix().postfixEval(), 4);
  });
  it('check when arithmetic and n are present inside sigma', function () {
    assert.equal(a.lex("Sigma1,2,(n*n)").toPostfix().postfixEval(), 5);
  });

  it('check when two parenthesis less functions are consecutive on one parameter', function () {
    assert.equal(a.lex("sinint2.5").toPostfix().postfixEval(), a.lex("sin(int(2.5))").toPostfix().postfixEval());
  });

  it('check eval method with single argument', function () {
    assert.equal(a.eval("5*3"), "15");
  });
  it('check eval method with three argument', function () {
    assert.equal(a.eval("mexp*3", [{ type: 3, show: "mexp", token: "mexp", value: "mexp", preced: 0 }], { mexp: 5 }), "15");
  });
  it('check eval method with two argument when second one is value of constants', function () {
    a.addToken([{ type: 3, show: "mexp", value: "mexp", preced: 0, token: "mexp" }]);
    assert.equal(a.eval("mexp*3", { mexp: 5 }), "15");
  });
  it('check eval method with two argument when second one is value of constants', function () {
    a.addToken([{ type: 0, show: "mexp", value: function (a) { return 5 * a; }, preced: 11, token: "mexp" }]);
    assert.equal(a.lex("mexp3").toPostfix().postfixEval(), "15");
  });
  it('check eval method with two argument when second one is token list', function () {
    assert.equal(a.eval("mexp(3)", [{ type: 0, show: "mexp(", value: function (a) { return 5 * a; }, preced: 11, token: "mexp" }]), "15");
  });
  it('Pi', function () {
    assert.equal(a.eval("Pi1,5,n"), "120");
  });
  it('tan5(6+3)', function () {
    assert.equal(
      Math.round((a.eval("tan45(6+3)") + Number.EPSILON) * 100) / 100,
      Math.round((9 + Number.EPSILON) * 100) / 100
    );
  });
  it('tan(40+5)', function () {
    assert.equal(a.eval("tan(40+5)"), "1");
  });
  it('checks when a 0 is missing in a decimal number', function () {
    assert.equal(a.eval("5*.8"), "4");
  });
  it('checks root function', function () {
    assert.equal(a.eval("root4"), "2");
    assert.equal(
      Math.round((a.eval("root(4-1^2)") + Number.EPSILON) * 100) / 100,
      Math.round((Math.sqrt(3) + Number.EPSILON) * 100) / 100
    )
    assert.equal(
      Math.round((a.eval("root(4-(2-1)^2)") + Number.EPSILON) * 100) / 100,
      Math.round((Math.sqrt(3) + Number.EPSILON) * 100) / 100
    )
  });
  it('checks + precedence before number insise parenthesis ', function () {
    assert.equal(a.eval("(-2)"), "-2");
  });
  it('checks multiple allowable operator', function () {
    assert.equal(a.eval("2+++-++-+-+3"), "-1");
    assert.equal(a.eval("2*+3"), "6");
  });
});
describe('These expression will check for types of returned result', function () {
  it('should tell to compllete expression', function () {
    assert.equal(typeof a.eval('0'), 'number')
  });
});
describe('These expression will raise error', function () {
  it('should tell to compllete expression', function () {
    try {
      a.eval("2*")
      assert.equal(1, 2)
    }
    catch (e) {
      assert.equal(e.message, "complete the expression")
    }
  });
  it('should warn about multiple operators', function () {
    try {
      a.eval("2**3")
      assert.equal(1, 2)
    }
    catch (e) {
      assert.equal(e.message, "* is not allowed after *")
    }
  });
  it('should warn about multiple operators', function () {
    try {
      a.eval("2*Mod*3")
      assert.equal(1, 2)
    }
    catch (e) {
      assert.equal(e.message, "Mod is not allowed after *")
    }
  });
  it('should warn about operator inside parenthesis', function () {
    try {
      a.eval("(+)")
      assert.equal(1, 2)
    }
    catch (e) {
      assert.equal(e.message, ") is not allowed after +")
    }
  });
  it('should warn about operator inside parenthesis', function () {
    try {
      a.eval("(2+3+)")
      assert.equal(1, 2)
    }
    catch (e) {
      assert.equal(e.message, ") is not allowed after +")
    }
  });
  it('should warn about using space as operator', function () {
    try {
      console.log(a.eval("1 2"))
      assert.equal(1, 2)
    }
    catch (e) {
      assert.equal(e.message, "Unexpected Space")
    }
  });
  it('should warn about using space as operator', function () {
    try {
      console.log(a.eval("1. 2"))
      assert.equal(1, 2)
    }
    catch (e) {
      assert.equal(e.message, "Unexpected Space")
    }
  });

});
describe('Check autoclose of parenthesis of parser', function () {
  it('should tell to compllete expression', function () {
    assert.equal(a.eval("((2+3*4"), "14");
  });
});
describe('Ading Token', function () {
  it('should tell to compllete expression', function () {

    a.addToken([{
      type: 2,
      token: "nroot",
      show: "nroot",
      value: function (a, b) {
        return Math.pow(a, 1 / b);
      }
    }])
    assert.equal(a.eval("27nroot3"), 3);
    a.addToken([{
      type: 2,
      token: "nrootlongesttoken",
      show: "nrootlongesttoken",
      value: function (a, b) {
        return Math.pow(a, 1 / b);
      }
    }])
    assert.equal(a.eval("27nrootlongesttoken3"), 3);
    a.addToken([{
      type: 2,
      token: "tokenwithnumber34",
      show: "tokenwithnumber34",
      value: function (a, b) {
        return a + b;
      }
    }])
    assert.equal(a.eval("17tokenwithnumber347"), 24);

  });
  it('should tell to compllete expression', function () {

    a.addToken([{
      type: 2,
      token: "nroot",
      show: "nroot",
      value: function (a, b) {
        return Math.pow(a, 1 / b);
      }
    }])
    assert.equal(a.eval("27nroot3"), 3);

  });
  it('should tell to compllete expression', function () {
    a.addToken([{
      type: 2,
      token: "nrootlongesttoken",
      show: "nrootlongesttoken",
      value: function (a, b) {
        return Math.pow(a, 1 / b);
      }
    }])
    assert.equal(a.eval("27nrootlongesttoken3"), 3);
  });
  it('should tell to compllete expression', function () {

    a.addToken([{
      type: 2,
      token: "tokenwithnumber34",
      show: "tokenwithnumber34",
      value: function (a, b) {
        return a + b;
      }
    }])
    assert.equal(a.eval("17tokenwithnumber347"), 24);

  });
  it('maximum of 5 numbers', function () {

    a.addToken([{
      type: 8,
      token: "maxof2",
      show: "maxof2",
      value: function (a, b, c) {
        return Math.max(a, b)
      }
    }])
    assert.equal(a.eval("maxof2(1,maxof2(maxof2(maxof2(maxof2(2,3),5),6),7))"), 7);

  });
});