/*
    This file is part of solidity.

    solidity 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.

    solidity 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 solidity.  If not, see <http://www.gnu.org/licenses/>.
*/
/**
 * @date 2018
 * Unit tests for the Yul object parser.
 */

#include <test/Options.h>

#include <test/libsolidity/ErrorCheck.h>

#include <libyul/AssemblyStack.h>

#include <libsolidity/interface/OptimiserSettings.h>

#include <boost/algorithm/string/replace.hpp>
#include <boost/test/unit_test.hpp>

#include <memory>
#include <optional>
#include <string>

using namespace std;
using namespace solidity::frontend;
using namespace solidity::langutil;

namespace solidity::yul::test
{

namespace
{

std::pair<bool, ErrorList> parse(string const& _source)
{
	try
	{
		AssemblyStack asmStack(
			solidity::test::Options::get().evmVersion(),
			AssemblyStack::Language::StrictAssembly,
			solidity::frontend::OptimiserSettings::none()
		);
		bool success = asmStack.parseAndAnalyze("source", _source);
		return {success, asmStack.errors()};
	}
	catch (FatalError const&)
	{
		BOOST_FAIL("Fatal error leaked.");
	}
	return {false, {}};
}

std::optional<Error> parseAndReturnFirstError(string const& _source, bool _allowWarnings = true)
{
	bool success;
	ErrorList errors;
	tie(success, errors) = parse(_source);
	if (!success)
	{
		BOOST_REQUIRE_EQUAL(errors.size(), 1);
		return *errors.front();
	}
	else
	{
		// If success is true, there might still be an error in the assembly stage.
		if (_allowWarnings && Error::containsOnlyWarnings(errors))
			return {};
		else if (!errors.empty())
		{
			if (!_allowWarnings)
				BOOST_CHECK_EQUAL(errors.size(), 1);
			return *errors.front();
		}
	}
	return {};
}

bool successParse(std::string const& _source, bool _allowWarnings = true)
{
	return !parseAndReturnFirstError(_source, _allowWarnings);
}

Error expectError(std::string const& _source, bool _allowWarnings = false)
{

	auto error = parseAndReturnFirstError(_source, _allowWarnings);
	BOOST_REQUIRE(error);
	return *error;
}

}

#define CHECK_ERROR(text, typ, substring) \
do \
{ \
	Error err = expectError((text), false); \
	BOOST_CHECK(err.type() == (Error::Type::typ)); \
	BOOST_CHECK(::solidity::frontend::test::searchErrorMessage(err, (substring))); \
} while(0)

BOOST_AUTO_TEST_SUITE(YulObjectParser)

BOOST_AUTO_TEST_CASE(empty_code)
{
	BOOST_CHECK(successParse("{ }"));
}

BOOST_AUTO_TEST_CASE(object_with_empty_code)
{
	BOOST_CHECK(successParse("object \"a\" { code { } }"));
}

BOOST_AUTO_TEST_CASE(non_object)
{
	CHECK_ERROR("code {}", ParserError, "Expected keyword \"object\"");
}

BOOST_AUTO_TEST_CASE(empty_name)
{
	CHECK_ERROR("object \"\" { code {} }", ParserError, "Object name cannot be empty");
}

BOOST_AUTO_TEST_CASE(recursion_depth)
{
	string input;
	for (size_t i = 0; i < 20000; i++)
		input += "object \"a" + to_string(i) + "\" { code {} ";
	for (size_t i = 0; i < 20000; i++)
		input += "}";

	CHECK_ERROR(input, ParserError, "recursion");
}

BOOST_AUTO_TEST_CASE(object_with_code)
{
	BOOST_CHECK(successParse("object \"a\" { code { let x := mload(0) sstore(0, x) } }"));
}

BOOST_AUTO_TEST_CASE(object_with_code_and_data)
{
	BOOST_CHECK(successParse("object \"a\" { code { let x := mload(0) sstore(0, x) } data \"b\" hex\"01010202\" }"));
}

BOOST_AUTO_TEST_CASE(object_with_non_code_at_start)
{
	CHECK_ERROR("object \"a\" { data \"d\" hex\"0102\" code {  } }", ParserError, "Expected keyword \"code\"");
}

BOOST_AUTO_TEST_CASE(nested_object)
{
	string code = R"(
		object "outer" {
			code { let x := mload(0) }
			data "x" "stringdata"
			object "inner" {
				code { mstore(0, 1) }
				object "inner inner" { code {} }
				data "innerx" "abc"
				data "innery" "def"
			}
		}
	)";
	BOOST_CHECK(successParse(code));
}

BOOST_AUTO_TEST_CASE(incomplete)
{
	CHECK_ERROR("object \"abc\" { code {} } object", ParserError, "Expected end of source");
}

BOOST_AUTO_TEST_CASE(reuse_object_name)
{
	string code = R"(
		object "outer" {
			code { }
			data "outer" "stringdata"
		}
	)";
	CHECK_ERROR(code, ParserError, "Object name cannot be the same as the name of the containing object");
}

BOOST_AUTO_TEST_CASE(reuse_object_in_subobject)
{
	string code = R"(
		object "outer" {
			code { }
			object "outer" { code {} }
		}
	)";
	CHECK_ERROR(code, ParserError, "Object name cannot be the same as the name of the containing object");
}

BOOST_AUTO_TEST_CASE(reuse_object_of_sibling)
{
	string code = R"(
		object "O" {
			code { }
			object "i" { code {} }
			data "i" "abc"
		}
	)";
	CHECK_ERROR(code, ParserError, "already exists inside the");
}

BOOST_AUTO_TEST_CASE(to_string)
{
	string code = R"(
		object "O" {
			code { let x := mload(0) if x { sstore(0, 1) } }
			object "i" { code {} data "j" "def" }
			data "j" "abc"
			data "k" hex"010203"
		}
	)";
	string expectation = R"(object "O" {
	code {
		let x := mload(0)
		if x { sstore(0, 1) }
	}
	object "i" {
		code { }
		data "j" hex"646566"
	}
	data "j" hex"616263"
	data "k" hex"010203"
}
)";
	expectation = boost::replace_all_copy(expectation, "\t", "    ");
	AssemblyStack asmStack(
		solidity::test::Options::get().evmVersion(),
		AssemblyStack::Language::StrictAssembly,
		solidity::frontend::OptimiserSettings::none()
	);
	BOOST_REQUIRE(asmStack.parseAndAnalyze("source", code));
	BOOST_CHECK_EQUAL(asmStack.print(), expectation);
}

BOOST_AUTO_TEST_CASE(arg_to_dataoffset_must_be_literal)
{
	string code = R"(
		object "outer" {
			code { let x := "outer" let y := dataoffset(x) }
		}
	)";
	CHECK_ERROR(code, TypeError, "Function expects direct literals as arguments.");
}

BOOST_AUTO_TEST_CASE(arg_to_datasize_must_be_literal)
{
	string code = R"(
		object "outer" {
			code { let x := "outer" let y := datasize(x) }
		}
	)";
	CHECK_ERROR(code, TypeError, "Function expects direct literals as arguments.");
}

BOOST_AUTO_TEST_CASE(args_to_datacopy_are_arbitrary)
{
	string code = R"(
		object "outer" {
			code { let x := 0 let y := 2 let s := 3 datacopy(x, y, s) }
		}
	)";
	BOOST_CHECK(successParse(code));
}


BOOST_AUTO_TEST_CASE(non_existing_objects)
{
	BOOST_CHECK(successParse(
		"object \"main\" { code { pop(datasize(\"main\")) } }"
	));
	CHECK_ERROR(
		"object \"main\" { code { pop(datasize(\"abc\")) } }",
		TypeError,
		"Unknown data object"
	);
}

BOOST_AUTO_TEST_SUITE_END()

}