/*
	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
/**
 * @author Lefteris <lefteris@ethdev.com>
 * @date 2014
 * Solidity command line interface.
 */
#pragma once

#include <solc/CommandLineParser.h>

#include <libsolidity/interface/CompilerStack.h>
#include <libsolidity/interface/DebugSettings.h>
#include <libsolidity/interface/FileReader.h>
#include <libyul/AssemblyStack.h>

#include <iostream>
#include <memory>
#include <string>

namespace solidity::frontend
{

class CommandLineInterface
{
public:
	explicit CommandLineInterface(
		std::istream& _sin,
		std::ostream& _sout,
		std::ostream& _serr,
		CommandLineOptions const& _options = CommandLineOptions{}
	):
		m_sin(_sin),
		m_sout(_sout),
		m_serr(_serr),
		m_options(_options)
	{}

	/// Parses command-line arguments, executes the requested operation and handles validation and
	/// execution errors.
	/// @returns false if it catches a @p CommandLineValidationError or if the application is
	/// expected to exit with a non-zero exit code despite there being no error.
	bool run(int _argc, char const* const* _argv);

	/// Parses command line arguments and stores the result in @p m_options.
	/// @throws CommandLineValidationError if command-line arguments are invalid.
	/// @returns false if the application is expected to exit with a non-zero exit code despite
	/// there being no error.
	bool parseArguments(int _argc, char const* const* _argv);

	/// Reads the content of all input files and initializes the file reader.
	/// @throws CommandLineValidationError if it fails to read the input files (invalid paths,
	/// non-existent files, not enough or too many input files, etc.).
	void readInputFiles();

	/// Executes the requested operation (compilation, assembling, standard JSON, etc.) and prints
	/// results to the terminal.
	/// @throws CommandLineExecutionError if execution fails due to errors in the input files.
	/// @throws CommandLineOutputError if creating output files or writing to them fails.
	void processInput();

	CommandLineOptions const& options() const { return m_options; }
	FileReader const& fileReader() const { return m_fileReader; }
	std::optional<std::string> const& standardJsonInput() const { return m_standardJsonInput; }

private:
	void printVersion();
	void printLicense();
	void compile();
	void link();
	void writeLinkedFiles();
	/// @returns the ``// <identifier> -> name`` hint for library placeholders.
	static std::string libraryPlaceholderHint(std::string const& _libraryName);
	/// @returns the full object with library placeholder hints in hex.
	static std::string objectWithLinkRefsHex(evmasm::LinkerObject const& _obj);

	void assemble(yul::AssemblyStack::Language _language, yul::AssemblyStack::Machine _targetMachine);

	void outputCompilationResults();

	void handleCombinedJSON();
	void handleAst();
	void handleBinary(std::string const& _contract);
	void handleOpcode(std::string const& _contract);
	void handleIR(std::string const& _contract);
	void handleIROptimized(std::string const& _contract);
	void handleEwasm(std::string const& _contract);
	void handleBytecode(std::string const& _contract);
	void handleSignatureHashes(std::string const& _contract);
	void handleMetadata(std::string const& _contract);
	void handleABI(std::string const& _contract);
	void handleNatspec(bool _natspecDev, std::string const& _contract);
	void handleGasEstimation(std::string const& _contract);
	void handleStorageLayout(std::string const& _contract);

	/// Tries to read @ m_sourceCodes as a JSONs holding ASTs
	/// such that they can be imported into the compiler  (importASTs())
	/// (produced by --combined-json ast <file.sol>
	/// or standard-json output
	std::map<std::string, Json::Value> parseAstFromInput();

	/// Create a file in the given directory
	/// @arg _fileName the name of the file
	/// @arg _data to be written
	void createFile(std::string const& _fileName, std::string const& _data);

	/// Create a json file in the given directory
	/// @arg _fileName the name of the file (the extension will be replaced with .json)
	/// @arg _json json string to be written
	void createJson(std::string const& _fileName, std::string const& _json);

	/// Returns the stream that should receive normal output. Sets m_hasOutput to true if the
	/// stream has ever been used unless @arg _markAsUsed is set to false.
	std::ostream& sout(bool _markAsUsed = true);

	/// Returns the stream that should receive error output. Sets m_hasOutput to true if the
	/// stream has ever been used unless @arg _markAsUsed is set to false.
	std::ostream& serr(bool _markAsUsed = true);

	std::istream& m_sin;
	std::ostream& m_sout;
	std::ostream& m_serr;
	bool m_hasOutput = false;
	FileReader m_fileReader;
	std::optional<std::string> m_standardJsonInput;
	std::unique_ptr<frontend::CompilerStack> m_compiler;
	CommandLineOptions m_options;
};

}