/*
	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/>.
*/
// SPDX-License-Identifier: GPL-3.0

#include <boost/algorithm/string/replace.hpp>
#include <test/libsolidity/ASTJSONTest.h>
#include <test/Common.h>
#include <libsolutil/AnsiColorized.h>
#include <liblangutil/SourceReferenceFormatter.h>
#include <libsolidity/ast/ASTJsonConverter.h>
#include <libsolidity/interface/CompilerStack.h>
#include <boost/algorithm/string.hpp>
#include <boost/algorithm/string/predicate.hpp>
#include <boost/throw_exception.hpp>
#include <boost/test/unit_test.hpp>
#include <fstream>
#include <memory>
#include <stdexcept>

using namespace solidity::langutil;
using namespace solidity::frontend;
using namespace solidity::frontend::test;
using namespace solidity::util::formatting;
using namespace solidity::util;
using namespace solidity;
using namespace std;
namespace fs = boost::filesystem;
using namespace boost::unit_test;

namespace
{

string const sourceDelimiter("==== Source: ");

void replaceVersionWithTag(string& _input)
{
	boost::algorithm::replace_all(
		_input,
		"\"" + solidity::test::CommonOptions::get().evmVersion().name() + "\"",
		"%EVMVERSION%"
	);
}

void replaceTagWithVersion(string& _input)
{
	boost::algorithm::replace_all(
		_input,
		"%EVMVERSION%",
		"\"" + solidity::test::CommonOptions::get().evmVersion().name() + "\""
	);
}

}


ASTJSONTest::ASTJSONTest(string const& _filename)
{
	if (!boost::algorithm::ends_with(_filename, ".sol"))
		BOOST_THROW_EXCEPTION(runtime_error("Invalid test contract file name: \"" + _filename + "\"."));

	m_astFilename = _filename.substr(0, _filename.size() - 4) + ".json";
	m_astParseOnlyFilename = _filename.substr(0, _filename.size() - 4) + "_parseOnly.json";

	ifstream file(_filename);
	if (!file)
		BOOST_THROW_EXCEPTION(runtime_error("Cannot open test contract: \"" + _filename + "\"."));
	file.exceptions(ios::badbit);

	string sourceName;
	string source;
	string line;
	string const delimiter("// ----");
	while (getline(file, line))
	{
		if (boost::algorithm::starts_with(line, sourceDelimiter))
		{
			if (!sourceName.empty())
				m_sources.emplace_back(sourceName, source);

			sourceName = line.substr(
				sourceDelimiter.size(),
				line.size() - " ===="s.size() - sourceDelimiter.size()
			);
			source = string();
		}
		else if (!line.empty() && !boost::algorithm::starts_with(line, delimiter))
			source += line + "\n";
	}

	m_sources.emplace_back(sourceName.empty() ? "a" : sourceName, source);

	file.close();
	file.open(m_astFilename);
	if (file)
	{
		string line;
		while (getline(file, line))
			m_expectation += line + "\n";
	}

	file.close();
	file.open(m_astParseOnlyFilename);
	if (file)
	{
		string line;
		while (getline(file, line))
			m_expectationParseOnly += line + "\n";
	}

	file.close();
}

TestCase::TestResult ASTJSONTest::run(ostream& _stream, string const& _linePrefix, bool const _formatted)
{
	CompilerStack c;

	StringMap sources;
	map<string, unsigned> sourceIndices;
	for (size_t i = 0; i < m_sources.size(); i++)
	{
		sources[m_sources[i].first] = m_sources[i].second;
		sourceIndices[m_sources[i].first] = static_cast<unsigned>(i + 1);
	}
	c.setSources(sources);
	c.setEVMVersion(solidity::test::CommonOptions::get().evmVersion());


	if (!c.compile(CompilerStack::State::Parsed))
	{
		SourceReferenceFormatter formatter(_stream, _formatted, false);
		for (auto const& error: c.errors())
			formatter.printErrorInformation(*error);
		return TestResult::FatalError;
	}

	bool resultsMatch = runTest(
		m_expectationParseOnly,
		m_resultParseOnly,
		sourceIndices,
		c,
		"parseOnly",
		_stream,
		_linePrefix,
		_formatted
	);

	c.reset();
	c.setSources(sources);
	c.setEVMVersion(solidity::test::CommonOptions::get().evmVersion());
	if (!c.parse())
	{
		// Empty Expectations means we expect failure
		if (m_expectation.empty())
			return resultsMatch ? TestResult::Success : TestResult::Failure;

		SourceReferenceFormatter formatter(_stream, _formatted, false);
		for (auto const& error: c.errors())
			formatter.printErrorInformation(*error);
		return TestResult::FatalError;
	}

	c.analyze();

	resultsMatch = runTest(
		m_expectation,
		m_result,
		sourceIndices,
		c,
		"",
		_stream,
		_linePrefix,
		_formatted
	) && resultsMatch;

	return resultsMatch ? TestResult::Success : TestResult::Failure;
}

bool ASTJSONTest::runTest(
	string& _expectation,
	string& _result,
	map<string, unsigned> const& _sourceIndices,
	CompilerStack& _compiler,
	string const& _variation,
	ostream& _stream,
	string const& _linePrefix,
	bool const _formatted
)
{
	if (m_sources.size() > 1)
		_result += "[\n";

	for (size_t i = 0; i < m_sources.size(); i++)
	{
		ostringstream result;
		ASTJsonConverter(_compiler.state(), _sourceIndices).print(result, _compiler.ast(m_sources[i].first));
		_result += result.str();
		if (i != m_sources.size() - 1)
			_result += ",";
		_result += "\n";
	}

	if (m_sources.size() > 1)
		_result += "]\n";

	replaceTagWithVersion(_expectation);

	if (_expectation != _result)
	{
		string nextIndentLevel = _linePrefix + "  ";
		AnsiColorized(_stream, _formatted, {BOLD, CYAN}) <<
			_linePrefix <<
			"Expected result" <<
			(!_variation.empty() ? " (" + _variation + "):" : ":") <<
			endl;
		{
			istringstream stream(_expectation);
			string line;
			while (getline(stream, line))
				_stream << nextIndentLevel << line << endl;
		}
		_stream << endl;

		AnsiColorized(_stream, _formatted, {BOLD, CYAN}) <<
			_linePrefix <<
			"Obtained result" <<
			(!_variation.empty() ? " (" + _variation + "):" : ":") <<
			endl;
		{
			istringstream stream(_result);
			string line;
			while (getline(stream, line))
				_stream << nextIndentLevel << line << endl;
		}
		_stream << endl;
		return false;
	}

	return true;
}

void ASTJSONTest::printSource(ostream& _stream, string const& _linePrefix, bool const) const
{
	for (auto const& source: m_sources)
	{
		if (m_sources.size() > 1 || source.first != "a")
			_stream << _linePrefix << sourceDelimiter << source.first << endl << endl;
		stringstream stream(source.second);
		string line;
		while (getline(stream, line))
			_stream << _linePrefix << line << endl;
		_stream << endl;
	}
}

void ASTJSONTest::printUpdatedExpectations(std::ostream&, std::string const&) const
{
	updateExpectation(m_astFilename, m_result, "");
	updateExpectation(m_astParseOnlyFilename, m_resultParseOnly, "parseOnly ");
}

void ASTJSONTest::updateExpectation(string const& _filename, string const& _expectation, string const& _variation) const
{
	ofstream file(_filename.c_str());
	if (!file) BOOST_THROW_EXCEPTION(runtime_error("Cannot write " + _variation + "AST expectation to \"" + _filename + "\"."));
	file.exceptions(ios::badbit);

	string replacedResult = _expectation;
	replaceVersionWithTag(replacedResult);

	file << replacedResult;
	file.flush();
	file.close();
}