/*************************************************************************
** CalculatorTest.cpp                                                   **
**                                                                      **
** This file is part of dvisvgm -- a fast DVI to SVG converter          **
** Copyright (C) 2005-2023 Martin Gieseking <martin.gieseking@uos.de>   **
**                                                                      **
** This program is free software; you can redistribute it and/or        **
** modify it under the terms of the GNU General Public License as       **
** published by the Free Software Foundation; either version 3 of       **
** the License, or (at your option) any later version.                  **
**                                                                      **
** This program is distributed in the hope that it will be useful, but  **
** WITHOUT ANY WARRANTY; without even the implied warranty of           **
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the         **
** GNU General Public License for more details.                         **
**                                                                      **
** You should have received a copy of the GNU General Public License    **
** along with this program; if not, see <http://www.gnu.org/licenses/>. **
*************************************************************************/

#include <gtest/gtest.h>
#include "Calculator.hpp"
#include "Length.hpp"


TEST(CalculatorTest, eval) {
	Calculator calc;
	EXPECT_EQ(calc.eval("2"),             2);
	EXPECT_EQ(calc.eval("-2"),           -2);
	EXPECT_EQ(calc.eval("2+3+4"),         9);
	EXPECT_EQ(calc.eval(" 2 + 3+ 4 "),    9);
	EXPECT_EQ(calc.eval("2*3+4"),        10);
	EXPECT_EQ(calc.eval("2+3*4"),        14);
	EXPECT_EQ(calc.eval("(2+3)*4"),      20);
	EXPECT_EQ(calc.eval("2*(3+4)"),      14);
	EXPECT_EQ(calc.eval("2(3+4)"),       14);
	EXPECT_EQ(calc.eval("(1+2)(3+4)"),   21);
	EXPECT_EQ(calc.eval("-(1+2)(3+4)"), -21);
	EXPECT_EQ(calc.eval("(1+2)-(3+4)"),  -4);
	EXPECT_EQ(calc.eval("-2+3+4"),        5);
	EXPECT_EQ(calc.eval("3/2"),         1.5);
	EXPECT_EQ(calc.eval("1+3/2"),       2.5);
	EXPECT_EQ(calc.eval("3/2+1"),       2.5);
	EXPECT_EQ(calc.eval("3%2"),           1);
	EXPECT_EQ(calc.eval("1+3%2"),         2);
	EXPECT_EQ(calc.eval("3%2+1"),         2);
	EXPECT_EQ(calc.eval("-(4)"),         -4);
}


TEST(CalculatorTest, variables) {
	Calculator calc;
	calc.setVariable("a", 1);
	EXPECT_EQ(calc.getVariable("a"), 1);

	calc.setVariable("a", 2);
	EXPECT_EQ(calc.getVariable("a"), 2);

	calc.setVariable("b", 3);
	EXPECT_EQ(calc.eval("a+b"), 5);
	EXPECT_EQ(calc.eval("a+a*b"), 8);
	EXPECT_EQ(calc.eval("a*a+b"), 7);
	EXPECT_EQ(calc.eval("2a+2b"), 10);
	EXPECT_EQ(calc.eval("2a(1+2b)"), 28);
}


TEST(CalculatorTest, exceptions) {
	Calculator calc;
	ASSERT_THROW(calc.eval("2++3"), CalculatorException);
	ASSERT_THROW(calc.eval("c"), CalculatorException);
	ASSERT_THROW(calc.eval("1/0"), CalculatorException);
	ASSERT_THROW(calc.eval("1%0"), CalculatorException);
	ASSERT_THROW(calc.eval("2*(3+4"), CalculatorException);
	ASSERT_THROW(calc.eval("2*(3+4))"), CalculatorException);
	ASSERT_THROW(calc.eval("2*3+4)"), CalculatorException);
	ASSERT_THROW(calc.eval("2(3+4"), CalculatorException);
}


TEST(CalculatorTest, units) {
	Calculator calc;
	for (auto unit : Length::getUnits())
		calc.setVariable(unit.first, Length(1, unit.second).bp());
	EXPECT_DOUBLE_EQ(calc.eval("1bp+3bp"), 4.0);
	EXPECT_DOUBLE_EQ(calc.eval("1bp+1in"), 73.0);
	EXPECT_DOUBLE_EQ(calc.eval("5cm/1cm"), 5.0);
	EXPECT_DOUBLE_EQ(calc.eval("5cm/1cm"), 5.0);
	EXPECT_DOUBLE_EQ(calc.eval("5cm"), 5/2.54*72);
}
