// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0

#pragma once

#include "projectexplorer_export.h"

#include "toolchain.h"
#include "abi.h"
#include "headerpath.h"

#include <functional>
#include <memory>
#include <optional>

namespace ProjectExplorer {

namespace Internal {
class GccToolchainConfigWidget;
class GccToolchainFactory;

const QStringList gccPredefinedMacrosOptions(Utils::Id languageId);
}

// --------------------------------------------------------------------------
// GccToolchain
// --------------------------------------------------------------------------

class PROJECTEXPLORER_EXPORT GccToolchain : public Toolchain
{
public:
    enum SubType { RealGcc, Clang, MinGW, LinuxIcc };

    GccToolchain(Utils::Id typeId, SubType subType = RealGcc);
    ~GccToolchain() override;

    QString originalTargetTriple() const override;
    Utils::FilePath installDir() const override;
    QString version() const;
    Abis supportedAbis() const override;

    Utils::LanguageExtensions languageExtensions(const QStringList &cxxflags) const override;
    Utils::WarningFlags warningFlags(const QStringList &cflags) const override;
    Utils::FilePaths includedFiles(const QStringList &flags,
                                   const Utils::FilePath &directoryPath) const override;

    MacroInspectionRunner createMacroInspectionRunner() const override;
    BuiltInHeaderPathsRunner createBuiltInHeaderPathsRunner(const Utils::Environment &env) const override;

    void addToEnvironment(Utils::Environment &env) const override;
    Utils::FilePath makeCommand(const Utils::Environment &environment) const override;
    QStringList suggestedMkspecList() const override;
    QList<Utils::OutputLineParser *> createOutputParsers() const override;

    void toMap(Utils::Store &data) const override;
    void fromMap(const Utils::Store &data) override;

    std::unique_ptr<ToolchainConfigWidget> createConfigurationWidget() override;

    bool operator ==(const Toolchain &) const override;

    void resetToolchain(const Utils::FilePath &);
    void setPlatformCodeGenFlags(const QStringList &);
    QStringList extraCodeModelFlags() const override;
    QStringList platformCodeGenFlags() const;
    void setPlatformLinkerFlags(const QStringList &);
    QStringList platformLinkerFlags() const;

    static void addCommandPathToEnvironment(const Utils::FilePath &command, Utils::Environment &env);

    class DetectedAbisResult {
    public:
        DetectedAbisResult() = default;
        DetectedAbisResult(const Abis &supportedAbis, const QString &originalTargetTriple = {}) :
            supportedAbis(supportedAbis),
            originalTargetTriple(originalTargetTriple)
        { }

        Abis supportedAbis;
        QString originalTargetTriple;
    };
    GccToolchain *asGccToolchain() final { return this; }

    bool matchesCompilerCommand(const Utils::FilePath &command) const override;

    void setPriority(int priority) { m_priority = priority; }
    void setOriginalTargetTriple(const QString &targetTriple);

protected:
    using CacheItem = QPair<QStringList, Macros>;
    using GccCache = QVector<CacheItem>;

    void setSupportedAbis(const Abis &abis);
    void setInstallDir(const Utils::FilePath &installDir);
    void setMacroCache(const QStringList &allCxxflags, const Macros &macroCache) const;
    Macros macroCache(const QStringList &allCxxflags) const;

    virtual QString defaultDisplayName() const;
    virtual Utils::LanguageExtensions defaultLanguageExtensions() const;

    virtual DetectedAbisResult detectSupportedAbis() const;
    virtual QString detectVersion() const;
    virtual Utils::FilePath detectInstallDir() const;

    // Reinterpret options for compiler drivers inheriting from GccToolchain (e.g qcc) to apply -Wp option
    // that passes the initial options directly down to the gcc compiler
    using OptionsReinterpreter = std::function<QStringList(const QStringList &options)>;
    void setOptionsReinterpreter(const OptionsReinterpreter &optionsReinterpreter);

    using ExtraHeaderPathsFunction = std::function<void(HeaderPaths &)>;
    void initExtraHeaderPathsFunction(ExtraHeaderPathsFunction &&extraHeaderPathsFunction) const;

    int priority() const override { return m_priority; }

    QString sysRoot() const override;

private:
    void syncAutodetectedWithParentToolchains();
    void updateSupportedAbis() const;

protected:
    QStringList m_platformCodeGenFlags;
    QStringList m_platformLinkerFlags;

    OptionsReinterpreter m_optionsReinterpreter = [](const QStringList &v) { return v; };
    mutable ExtraHeaderPathsFunction m_extraHeaderPathsFunction = [](HeaderPaths &) {};

private:
    SubType m_subType = RealGcc;
    mutable Abis m_supportedAbis;
    mutable QString m_originalTargetTriple;
    mutable HeaderPaths m_headerPaths;
    mutable QString m_version;
    mutable Utils::FilePath m_installDir;

    friend class Internal::GccToolchainConfigWidget;
    friend class Internal::GccToolchainFactory;

    // "resolved" on macOS from /usr/bin/clang(++) etc to <DeveloperDir>/usr/bin/clang(++)
    // which is used for comparison with matchesCompilerCommand
    mutable std::optional<Utils::FilePath> m_resolvedCompilerCommand;
    QByteArray m_parentToolchainId;
    int m_priority = PriorityNormal;
    QMetaObject::Connection m_mingwToolchainAddedConnection;
    QMetaObject::Connection m_thisToolchainRemovedConnection;
};

namespace Internal { void setupGccToolchains(); }

} // namespace ProjectExplorer