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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>
 * @date 2014
 * Parser part that determines the declarations corresponding to names and the types of expressions.
 */

#pragma once

#include <map>
#include <list>
#include <boost/noncopyable.hpp>
#include <libsolidity/DeclarationContainer.h>
#include <libsolidity/ReferencesResolver.h>
#include <libsolidity/ASTVisitor.h>
#include <libsolidity/ASTAnnotations.h>

namespace dev
{
namespace solidity
{

/**
 * Resolves name references, typenames and sets the (explicitly given) types for all variable
 * declarations.
 */
class NameAndTypeResolver: private boost::noncopyable
{
public:
    NameAndTypeResolver(std::vector<Declaration const*> const& _globals, ErrorList& _errors);
    /// Registers all declarations found in the source unit.
    /// @returns false in case of error.
    bool registerDeclarations(SourceUnit& _sourceUnit);
    /// Resolves all names and types referenced from the given contract.
    /// @returns false in case of error.
    bool resolveNamesAndTypes(ContractDefinition& _contract);
    /// Updates the given global declaration (used for "this"). Not to be used with declarations
    /// that create their own scope.
    /// @returns false in case of error.
    bool updateDeclaration(Declaration const& _declaration);

    /// Resolves the given @a _name inside the scope @a _scope. If @a _scope is omitted,
    /// the global scope is used (i.e. the one containing only the contract).
    /// @returns a pointer to the declaration on success or nullptr on failure.
    std::vector<Declaration const*> resolveName(ASTString const& _name, Declaration const* _scope = nullptr) const;

    /// Resolves a name in the "current" scope. Should only be called during the initial
    /// resolving phase.
    std::vector<Declaration const*> nameFromCurrentScope(ASTString const& _name, bool _recursive = true) const;

    /// Resolves a path starting from the "current" scope. Should only be called during the initial
    /// resolving phase.
    /// @note Returns a null pointer if any component in the path was not unique or not found.
    Declaration const* pathFromCurrentScope(std::vector<ASTString> const& _path, bool _recursive = true) const;

    /// returns the vector of declarations without repetitions
    std::vector<Declaration const*> cleanedDeclarations(
        Identifier const& _identifier,
        std::vector<Declaration const*> const& _declarations
    );

private:
    void reset();

    /// Imports all members declared directly in the given contract (i.e. does not import inherited members)
    /// into the current scope if they are not present already.
    void importInheritedScope(ContractDefinition const& _base);

    /// Computes "C3-Linearization" of base contracts and stores it inside the contract. Reports errors if any
    void linearizeBaseContracts(ContractDefinition& _contract);
    /// Computes the C3-merge of the given list of lists of bases.
    /// @returns the linearized vector or an empty vector if linearization is not possible.
    template <class _T>
    static std::vector<_T const*> cThreeMerge(std::list<std::list<_T const*>>& _toMerge);

    /// Maps nodes declaring a scope to scopes, i.e. ContractDefinition and FunctionDeclaration,
    /// where nullptr denotes the global scope. Note that structs are not scope since they do
    /// not contain code.
    std::map<ASTNode const*, DeclarationContainer> m_scopes;

    // creates the Declaration error and adds it in the errors list
    void reportDeclarationError(
        SourceLocation _sourceLoction,
        std::string const& _description,
        SourceLocation _secondarySourceLocation,
        std::string const& _secondaryDescription
    );
    // creates the Declaration error and adds it in the errors list
    void reportDeclarationError(SourceLocation _sourceLocation, std::string const& _description);
    // creates the Declaration error and adds it in the errors list and throws FatalError
    void reportFatalDeclarationError(SourceLocation _sourceLocation, std::string const& _description);

    // creates the Declaration error and adds it in the errors list
    void reportTypeError(Error const& _e);
    // creates the Declaration error and adds it in the errors list and throws FatalError
    void reportFatalTypeError(Error const& _e);

    DeclarationContainer* m_currentScope = nullptr;
    ErrorList& m_errors;
};

/**
 * Traverses the given AST upon construction and fills _scopes with all declarations inside the
 * AST.
 */
class DeclarationRegistrationHelper: private ASTVisitor
{
public:
    DeclarationRegistrationHelper(std::map<ASTNode const*, DeclarationContainer>& _scopes, ASTNode& _astRoot, ErrorList& _errors);

private:
    bool visit(ContractDefinition& _contract) override;
    void endVisit(ContractDefinition& _contract) override;
    bool visit(StructDefinition& _struct) override;
    void endVisit(StructDefinition& _struct) override;
    bool visit(EnumDefinition& _enum) override;
    void endVisit(EnumDefinition& _enum) override;
    bool visit(EnumValue& _value) override;
    bool visit(FunctionDefinition& _function) override;
    void endVisit(FunctionDefinition& _function) override;
    bool visit(ModifierDefinition& _modifier) override;
    void endVisit(ModifierDefinition& _modifier) override;
    void endVisit(VariableDeclarationStatement& _variableDeclarationStatement) override;
    bool visit(VariableDeclaration& _declaration) override;
    bool visit(EventDefinition& _event) override;
    void endVisit(EventDefinition& _event) override;

    void enterNewSubScope(Declaration const& _declaration);
    void closeCurrentScope();
    void registerDeclaration(Declaration& _declaration, bool _opensScope);

    /// @returns the canonical name of the current scope.
    std::string currentCanonicalName() const;
    // creates the Declaration error and adds it in the errors list
    void declarationError(
        SourceLocation _sourceLocation,
        std::string const& _description,
        SourceLocation _secondarySourceLocation,
        std::string const& _secondaryDescription
    );

    // creates the Declaration error and adds it in the errors list
    void declarationError(SourceLocation _sourceLocation, std::string const& _description);
    // creates the Declaration error and adds it in the errors list and throws FatalError
    void fatalDeclarationError(SourceLocation _sourceLocation, std::string const& _description);

    std::map<ASTNode const*, DeclarationContainer>& m_scopes;
    Declaration const* m_currentScope;
    VariableScope* m_currentFunction;
    ErrorList& m_errors;
};

}
}