/*
	This file is part of cpp-ethereum.

	cpp-ethereum 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.

	cpp-ethereum 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 cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
*/
/**
 * @author Christian <c@ethdev.com>
 * @author Gav Wood <g@ethdev.com>
 * @date 2014
 * Full-stack compiler that converts a source code string to bytecode.
 */

#include <libsolidity/AST.h>
#include <libsolidity/Scanner.h>
#include <libsolidity/Parser.h>
#include <libsolidity/GlobalContext.h>
#include <libsolidity/NameAndTypeResolver.h>
#include <libsolidity/Compiler.h>
#include <libsolidity/CompilerStack.h>
#include <libsolidity/InterfaceHandler.h>

#include <libdevcrypto/SHA3.h>

using namespace std;

namespace dev
{
namespace solidity
{

bool CompilerStack::addSource(string const& _name, string const& _content)
{
	bool existed = m_sources.count(_name) != 0;
	reset(true);
	m_sources[_name].scanner = make_shared<Scanner>(CharStream(_content), _name);
	return existed;
}

void CompilerStack::setSource(string const& _sourceCode)
{
	reset();
	addSource("", _sourceCode);
}

void CompilerStack::parse()
{
	for (auto& sourcePair: m_sources)
	{
		sourcePair.second.scanner->reset();
		sourcePair.second.ast = Parser().parse(sourcePair.second.scanner);
	}
	resolveImports();

	m_globalContext = make_shared<GlobalContext>();
	NameAndTypeResolver resolver(m_globalContext->getDeclarations());
	for (Source const* source: m_sourceOrder)
		resolver.registerDeclarations(*source->ast);
	for (Source const* source: m_sourceOrder)
		for (ASTPointer<ASTNode> const& node: source->ast->getNodes())
			if (ContractDefinition* contract = dynamic_cast<ContractDefinition*>(node.get()))
			{
				m_globalContext->setCurrentContract(*contract);
				resolver.updateDeclaration(*m_globalContext->getCurrentThis());
				resolver.resolveNamesAndTypes(*contract);
				m_contracts[contract->getName()].contract = contract;
			}
	for (Source const* source: m_sourceOrder)
		for (ASTPointer<ASTNode> const& node: source->ast->getNodes())
			if (ContractDefinition* contract = dynamic_cast<ContractDefinition*>(node.get()))
			{
				m_globalContext->setCurrentContract(*contract);
				resolver.updateDeclaration(*m_globalContext->getCurrentThis());
				resolver.checkTypeRequirements(*contract);
				m_contracts[contract->getName()].contract = contract;
			}
	m_parseSuccessful = true;
}

void CompilerStack::parse(string const& _sourceCode)
{
	setSource(_sourceCode);
	parse();
}

vector<string> CompilerStack::getContractNames() const
{
	if (!m_parseSuccessful)
		BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("Parsing was not successful."));
	vector<string> contractNames;
	for (auto const& contract: m_contracts)
		contractNames.push_back(contract.first);
	return contractNames;
}

void CompilerStack::compile(bool _optimize)
{
	if (!m_parseSuccessful)
		parse();

	map<ContractDefinition const*, bytes const*> contractBytecode;
	for (Source const* source: m_sourceOrder)
		for (ASTPointer<ASTNode> const& node: source->ast->getNodes())
			if (ContractDefinition* contract = dynamic_cast<ContractDefinition*>(node.get()))
			{
				m_globalContext->setCurrentContract(*contract);
				shared_ptr<Compiler> compiler = make_shared<Compiler>(_optimize);
				compiler->compileContract(*contract, m_globalContext->getMagicVariables(),
										  contractBytecode);
				Contract& compiledContract = m_contracts[contract->getName()];
				compiledContract.bytecode = compiler->getAssembledBytecode();
				compiledContract.runtimeBytecode = compiler->getRuntimeBytecode();
				compiledContract.compiler = move(compiler);
				contractBytecode[compiledContract.contract] = &compiledContract.bytecode;
			}
}

bytes const& CompilerStack::compile(string const& _sourceCode, bool _optimize)
{
	parse(_sourceCode);
	compile(_optimize);
	return getBytecode();
}

bytes const& CompilerStack::getBytecode(string const& _contractName) const
{
	return getContract(_contractName).bytecode;
}

bytes const& CompilerStack::getRuntimeBytecode(string const& _contractName) const
{
	return getContract(_contractName).runtimeBytecode;
}

dev::h256 CompilerStack::getContractCodeHash(string const& _contractName) const
{
	return dev::sha3(getRuntimeBytecode(_contractName));
}

void CompilerStack::streamAssembly(ostream& _outStream, string const& _contractName) const
{
	getContract(_contractName).compiler->streamAssembly(_outStream);
}

string const& CompilerStack::getInterface(string const& _contractName) const
{
	return getMetadata(_contractName, DocumentationType::ABI_INTERFACE);
}

string const& CompilerStack::getSolidityInterface(string const& _contractName) const
{
	return getMetadata(_contractName, DocumentationType::ABI_SOLIDITY_INTERFACE);
}

string const& CompilerStack::getMetadata(string const& _contractName, DocumentationType _type) const
{
	if (!m_parseSuccessful)
		BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("Parsing was not successful."));

	Contract const& contract = getContract(_contractName);

	std::unique_ptr<string const>* doc;
	switch (_type)
	{
	case DocumentationType::NATSPEC_USER:
		doc = &contract.userDocumentation;
		break;
	case DocumentationType::NATSPEC_DEV:
		doc = &contract.devDocumentation;
		break;
	case DocumentationType::ABI_INTERFACE:
		doc = &contract.interface;
		break;
	case DocumentationType::ABI_SOLIDITY_INTERFACE:
		doc = &contract.solidityInterface;
		break;
	default:
		BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Illegal documentation type."));
	}
	if (!*doc)
		*doc = contract.interfaceHandler->getDocumentation(*contract.contract, _type);
	return *(*doc);
}

Scanner const& CompilerStack::getScanner(string const& _sourceName) const
{
	return *getSource(_sourceName).scanner;
}

SourceUnit const& CompilerStack::getAST(string const& _sourceName) const
{
	return *getSource(_sourceName).ast;
}

ContractDefinition const& CompilerStack::getContractDefinition(string const& _contractName) const
{
	return *getContract(_contractName).contract;
}

bytes CompilerStack::staticCompile(std::string const& _sourceCode, bool _optimize)
{
	CompilerStack stack;
	return stack.compile(_sourceCode, _optimize);
}

void CompilerStack::reset(bool _keepSources)
{
	m_parseSuccessful = false;
	if (_keepSources)
		for (auto sourcePair: m_sources)
			sourcePair.second.reset();
	else
		m_sources.clear();
	m_globalContext.reset();
	m_sourceOrder.clear();
	m_contracts.clear();
}

void CompilerStack::resolveImports()
{
	// topological sorting (depth first search) of the import graph, cutting potential cycles
	vector<Source const*> sourceOrder;
	set<Source const*> sourcesSeen;

	function<void(Source const*)> toposort = [&](Source const* _source)
	{
		if (sourcesSeen.count(_source))
			return;
		sourcesSeen.insert(_source);
		for (ASTPointer<ASTNode> const& node: _source->ast->getNodes())
			if (ImportDirective const* import = dynamic_cast<ImportDirective*>(node.get()))
			{
				string const& id = import->getIdentifier();
				if (!m_sources.count(id))
					BOOST_THROW_EXCEPTION(ParserError()
										  << errinfo_sourceLocation(import->getLocation())
										  << errinfo_comment("Source not found."));
				toposort(&m_sources[id]);
			}
		sourceOrder.push_back(_source);
	};

	for (auto const& sourcePair: m_sources)
		toposort(&sourcePair.second);

	swap(m_sourceOrder, sourceOrder);
}

CompilerStack::Contract const& CompilerStack::getContract(string const& _contractName) const
{
	if (m_contracts.empty())
		BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("No compiled contracts found."));
	string contractName = _contractName;
	if (_contractName.empty())
		// try to find the "last contract"
		for (ASTPointer<ASTNode> const& node: m_sourceOrder.back()->ast->getNodes())
			if (auto contract = dynamic_cast<ContractDefinition const*>(node.get()))
				contractName = contract->getName();
	auto it = m_contracts.find(contractName);
	if (it == m_contracts.end())
		BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("Contract " + _contractName + " not found."));
	return it->second;
}

CompilerStack::Source const& CompilerStack::getSource(string const& _sourceName) const
{
	auto it = m_sources.find(_sourceName);
	if (it == m_sources.end())
		BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("Given source file not found."));
	return it->second;
}

CompilerStack::Contract::Contract(): interfaceHandler(make_shared<InterfaceHandler>()) {}

}
}