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** Copyright (C) 2018 The Qt Company Ltd.
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#pragma once

#include <clang/Tooling/Tooling.h>

#include <clang/Basic/DiagnosticOptions.h>
#include <clang/Frontend/CompilerInstance.h>
#include <clang/Frontend/FrontendActions.h>
#include <clang/Lex/PreprocessorOptions.h>

namespace ClangBackEnd {

class GeneratePCHAction final : public clang::GeneratePCHAction
{
public:
    GeneratePCHAction(llvm::StringRef filePath, llvm::StringRef fileContent)
        : m_filePath(filePath)
        , m_fileContent(fileContent)
    {}

    bool BeginInvocation(clang::CompilerInstance &compilerInstance) override
    {
        compilerInstance.getPreprocessorOpts().DisablePCHValidation = true;
        compilerInstance.getPreprocessorOpts().AllowPCHWithCompilerErrors = true;
        compilerInstance.getDiagnosticOpts().ErrorLimit = 0;
        compilerInstance.getFrontendOpts().SkipFunctionBodies = true;
        compilerInstance.getFrontendOpts().IncludeTimestamps = true;
        std::unique_ptr<llvm::MemoryBuffer> Input = llvm::MemoryBuffer::getMemBuffer(m_fileContent);
        compilerInstance.getPreprocessorOpts().addRemappedFile(m_filePath, Input.release());

        return clang::GeneratePCHAction::BeginSourceFileAction(compilerInstance);
    }

private:
    llvm::StringRef m_filePath;
    llvm::StringRef m_fileContent;
};

class GeneratePCHActionFactory final : public clang::tooling::FrontendActionFactory
{
public:
    GeneratePCHActionFactory(llvm::StringRef filePath, llvm::StringRef fileContent)
        : m_filePath(filePath)
        , m_fileContent(fileContent)
    {}

#if LLVM_VERSION_MAJOR >= 10
    std::unique_ptr<clang::FrontendAction> create() override
    {
        return std::make_unique<GeneratePCHAction>(m_filePath, m_fileContent);
    }
#else
    clang::FrontendAction *create() override
    {
        return new GeneratePCHAction{m_filePath, m_fileContent};
    }
#endif

private:
    llvm::StringRef m_filePath;
    llvm::StringRef m_fileContent;
};
} // namespace ClangBackEnd