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/*
    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.
 */

#pragma once

#include <ostream>
#include <string>
#include <memory>
#include <vector>
#include <boost/noncopyable.hpp>
#include <json/json.h>
#include <libdevcore/Common.h>
#include <libdevcore/FixedHash.h>
#include <libevmasm/SourceLocation.h>

namespace dev
{

namespace eth
{
class AssemblyItem;
using AssemblyItems = std::vector<AssemblyItem>;
}

namespace solidity
{

// forward declarations
class Scanner;
class ContractDefinition;
class FunctionDefinition;
class SourceUnit;
class Compiler;
class GlobalContext;
class InterfaceHandler;

enum class DocumentationType: uint8_t
{
    NatspecUser = 1,
    NatspecDev,
    ABIInterface,
    ABISolidityInterface
};

/**
 * Easy to use and self-contained Solidity compiler with as few header dependencies as possible.
 * It holds state and can be used to either step through the compilation stages (and abort e.g.
 * before compilation to bytecode) or run the whole compilation in one call.
 */
class CompilerStack: boost::noncopyable
{
public:
    /// Creates a new compiler stack. Adds standard sources if @a _addStandardSources.
    explicit CompilerStack(bool _addStandardSources = true);

    /// Resets the compiler to a state where the sources are not parsed or even removed.
    void reset(bool _keepSources = false, bool _addStandardSources = true);

    /// Adds a source object (e.g. file) to the parser. After this, parse has to be called again.
    /// @returns true if a source object by the name already existed and was replaced.
    void addSources(StringMap const& _nameContents, bool _isLibrary = false) { for (auto const& i: _nameContents) addSource(i.first, i.second, _isLibrary); }
    bool addSource(std::string const& _name, std::string const& _content, bool _isLibrary = false);
    void setSource(std::string const& _sourceCode);
    /// Parses all source units that were added
    void parse();
    /// Sets the given source code as the only source unit apart from standard sources and parses it.
    void parse(std::string const& _sourceCode);
    /// Returns a list of the contract names in the sources.
    std::vector<std::string> contractNames() const;
    std::string defaultContractName() const;

    /// Compiles the source units that were previously added and parsed.
    void compile(bool _optimize = false, unsigned _runs = 200);
    /// Parses and compiles the given source code.
    /// @returns the compiled bytecode
    bytes const& compile(std::string const& _sourceCode, bool _optimize = false);

    /// @returns the assembled bytecode for a contract.
    bytes const& bytecode(std::string const& _contractName = "") const;
    /// @returns the runtime bytecode for the contract, i.e. the code that is returned by the constructor.
    bytes const& runtimeBytecode(std::string const& _contractName = "") const;
    /// @returns the bytecode of a contract that uses an already deployed contract via CALLCODE.
    /// The returned bytes will contain a sequence of 20 bytes of the format "XXX...XXX" which have to
    /// substituted by the actual address. Note that this sequence starts end ends in three X
    /// characters but can contain anything in between.
    bytes const& cloneBytecode(std::string const& _contractName = "") const;
    /// @returns normal contract assembly items
    eth::AssemblyItems const* assemblyItems(std::string const& _contractName = "") const;
    /// @returns runtime contract assembly items
    eth::AssemblyItems const* runtimeAssemblyItems(std::string const& _contractName = "") const;
    /// @returns hash of the runtime bytecode for the contract, i.e. the code that is returned by the constructor.
    dev::h256 contractCodeHash(std::string const& _contractName = "") const;

    /// Streams a verbose version of the assembly to @a _outStream.
    /// @arg _sourceCodes is the map of input files to source code strings
    /// @arg _inJsonFromat shows whether the out should be in Json format
    /// Prerequisite: Successful compilation.
    Json::Value streamAssembly(std::ostream& _outStream, std::string const& _contractName = "", StringMap _sourceCodes = StringMap(), bool _inJsonFormat = false) const;

    /// Returns a string representing the contract interface in JSON.
    /// Prerequisite: Successful call to parse or compile.
    std::string const& interface(std::string const& _contractName = "") const;
    /// Returns a string representing the contract interface in Solidity.
    /// Prerequisite: Successful call to parse or compile.
    std::string const& solidityInterface(std::string const& _contractName = "") const;
    /// Returns a string representing the contract's documentation in JSON.
    /// Prerequisite: Successful call to parse or compile.
    /// @param type The type of the documentation to get.
    /// Can be one of 4 types defined at @c DocumentationType
    std::string const& metadata(std::string const& _contractName, DocumentationType _type) const;

    /// @returns the previously used scanner, useful for counting lines during error reporting.
    Scanner const& scanner(std::string const& _sourceName = "") const;
    /// @returns the parsed source unit with the supplied name.
    SourceUnit const& AST(std::string const& _sourceName = "") const;
    /// @returns the parsed contract with the supplied name. Throws an exception if the contract
    /// does not exist.
    ContractDefinition const& contractDefinition(std::string const& _contractName) const;

    /// @returns the offset of the entry point of the given function into the list of assembly items
    /// or zero if it is not found or does not exist.
    size_t functionEntryPoint(
        std::string const& _contractName,
        FunctionDefinition const& _function
    ) const;

    /// Compile the given @a _sourceCode to bytecode. If a scanner is provided, it is used for
    /// scanning the source code - this is useful for printing exception information.
    static bytes staticCompile(std::string const& _sourceCode, bool _optimize = false);

    /// Helper function for logs printing. Do only use in error cases, it's quite expensive.
    /// line and columns are numbered starting from 1 with following order:
    /// start line, start column, end line, end column
    std::tuple<int, int, int, int> positionFromSourceLocation(SourceLocation const& _sourceLocation) const;

private:
    /**
     * Information pertaining to one source unit, filled gradually during parsing and compilation.
     */
    struct Source
    {
        std::shared_ptr<Scanner> scanner;
        std::shared_ptr<SourceUnit> ast;
        std::string interface;
        bool isLibrary = false;
        void reset() { scanner.reset(); ast.reset(); interface.clear(); }
    };

    struct Contract
    {
        ContractDefinition const* contract = nullptr;
        std::shared_ptr<Compiler> compiler;
        bytes bytecode;
        bytes runtimeBytecode;
        bytes cloneBytecode;
        std::shared_ptr<InterfaceHandler> interfaceHandler;
        mutable std::unique_ptr<std::string const> interface;
        mutable std::unique_ptr<std::string const> solidityInterface;
        mutable std::unique_ptr<std::string const> userDocumentation;
        mutable std::unique_ptr<std::string const> devDocumentation;

        Contract();
    };

    void resolveImports();

    Contract const& contract(std::string const& _contractName = "") const;
    Source const& source(std::string const& _sourceName = "") const;

    bool m_parseSuccessful;
    std::map<std::string const, Source> m_sources;
    std::shared_ptr<GlobalContext> m_globalContext;
    std::vector<Source const*> m_sourceOrder;
    std::map<std::string const, Contract> m_contracts;
};

}
}