// test parse
var assert = require('assert');
var math = require('../../../math.js');

// test some expressions
assert.ok(math.parse('pi') instanceof math.expr.node.Node);
assert.equal(math.parse('pi').eval(), Math.PI);
assert.equal(math.parse('(2+3)/4').eval(), 1.25);
assert.equal(math.parse('sqrt(-4)').eval().toString(), '2i');

// test multiple expressions
assert.deepEqual(math.parse(['a=3', 'b=4', 'a*b']).map(function (node) {
    return node.eval();
}), [3, 4, 12]);
assert.deepEqual(math.parse(math.matrix(['a=3', 'b=4', 'a*b'])).map(function (node) {
    return node.eval();
}), math.matrix([3, 4, 12]));

// test block expression
assert.deepEqual(math.parse('a=3\nb=4\na*b').eval(), [3, 4, 12]);
assert.deepEqual(math.parse('function f(x) = a * x; a=2; f(4)').eval(), [8]);
assert.deepEqual(math.parse('b = 43; b * 4').eval(), [172]);

// test wrong number of arguments
assert.throws(function () {math.parse()}, SyntaxError);
assert.throws(function () {math.parse(1,2,3)}, SyntaxError);

// test wrong type of arguments
assert.throws(function () {math.parse(23)}, TypeError);
assert.throws(function () {math.parse(math.unit('5cm'))}, TypeError);
assert.throws(function () {math.parse(math.complex(2,3))}, TypeError);
assert.throws(function () {math.parse(math.range(1,5))}, TypeError);
assert.throws(function () {math.parse(true)}, TypeError);

// test providing a scope
var scope = {
    a: 3,
    b: 4
};
assert.deepEqual(math.parse('a*b', scope).eval(), 12);
assert.deepEqual(math.parse('c=5', scope).eval(), 5);
assert.deepEqual(math.parse('function f(x) = x^a', scope).eval(), 'f(x)');
assert.deepEqual(scope, {
    a: 3,
    b: 4,
    c: 5,
    f: 'f(x)',
    ans: 'f(x)'
});
assert.equal(scope.f(3), 27);
scope.a = 2;
assert.equal(scope.f(3), 9);
scope.hello = function (name) {
    return 'hello, ' + name + '!';
};
assert.deepEqual(math.parse('hello("jos")', scope).eval(), 'hello, jos!');


//test stringification of nodes
assert.equal(math.parse('0').toString(), 'ans = 0');
assert.equal(math.parse('0 + 2').toString(), 'ans = 0 + 2');
assert.equal(math.parse('"hello"').toString(), 'ans = "hello"');
assert.equal(math.parse('[1, 2 + 3i, 4]').toString(), 'ans = [[1, 2 + 3i, 4]]');


// test multiple unary minus
assert.equal(math.eval('5-3'), 2);
assert.equal(math.eval('5--3'), 8);
assert.equal(math.eval('5---3'), 2);
assert.equal(math.eval('5+---3'), 2);
assert.equal(math.eval('5----3'), 8);
assert.equal(math.eval('5+--(2+1)'), 8);