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** Copyright (C) 2016 The Qt Company Ltd.
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** General Public License version 3 as published by the Free Software
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#pragma once

#include "diagnostic.h"

#include <iterator>

#include <clang-c/Index.h>

namespace ClangBackEnd {

using uint = unsigned int;

class DiagnosticSet;

class DiagnosticSetIterator
{
public:
    using iterator_category = std::random_access_iterator_tag;
    using value_type = Diagnostic;
    using difference_type = uint;
    using pointer = Diagnostic *;
    using reference = Diagnostic &;

    DiagnosticSetIterator(CXTranslationUnit translationUnit,
                          CXDiagnosticSet cxDiagnosticSet,
                          uint index)
        : cxDiagnosticSet(cxDiagnosticSet),
          cxTranslationUnit(translationUnit),
          index(index)
    {}

    DiagnosticSetIterator(const DiagnosticSetIterator &other)
        : cxDiagnosticSet(other.cxDiagnosticSet),
          index(other.index)
    {}

    DiagnosticSetIterator& operator++()
    {
        ++index;
        return *this;
    }

    DiagnosticSetIterator operator++(int)
    {
        uint oldIndex = index++;
        return DiagnosticSetIterator(cxTranslationUnit, cxDiagnosticSet, oldIndex);
    }

    bool operator==(const DiagnosticSetIterator &other) const
    {
        return index == other.index && cxDiagnosticSet == other.cxDiagnosticSet;
    }

    bool operator!=(const DiagnosticSetIterator &other) const
    {
        return index != other.index || cxDiagnosticSet != other.cxDiagnosticSet;
    }

    Diagnostic operator*()
    {
        return Diagnostic(cxTranslationUnit, clang_getDiagnosticInSet(cxDiagnosticSet, index));
    }

private:
    CXDiagnosticSet cxDiagnosticSet;
    CXTranslationUnit cxTranslationUnit;
    uint index;
};

}