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#pragma once

#include "symbolqueryinterface.h"

#include "sourcelocations.h"

#include <filepathid.h>

#include <cpptools/usages.h>

#include <algorithm>

namespace ClangRefactoring {

template <typename StatementFactory>
class SymbolQuery final : public SymbolQueryInterface
{
    using ReadStatement = typename StatementFactory::ReadStatementType;

public:
    SymbolQuery(StatementFactory &statementFactory)
        : m_statementFactory(statementFactory)
    {}

    SourceLocations locationsAt(ClangBackEnd::FilePathId filePathId,
                                int line,
                                int utf8Column) const override
    {
        ReadStatement &locationsStatement = m_statementFactory.selectLocationsForSymbolLocation;

        const std::size_t reserveSize = 128;

        return locationsStatement.template values<SourceLocation, 3>(reserveSize,
                                                                     filePathId.filePathId,
                                                                     line,
                                                                     utf8Column);
    }

    CppTools::Usages sourceUsagesAt(ClangBackEnd::FilePathId filePathId,
                                    int line,
                                    int utf8Column) const override
    {
        ReadStatement &locationsStatement = m_statementFactory.selectSourceUsagesForSymbolLocation;

        const std::size_t reserveSize = 128;

        return locationsStatement.template values<CppTools::Usage, 3>(reserveSize,
                                                                      filePathId.filePathId,
                                                                      line,
                                                                      utf8Column);
    }

    Symbols symbolsWithOneSymbolKinds(ClangBackEnd::SymbolKind symbolKind,
                                      Utils::SmallStringView searchTerm) const
    {
        ReadStatement &statement = m_statementFactory.selectSymbolsForKindAndStartsWith;

        return statement.template values<Symbol, 3>(100, int(symbolKind), searchTerm);
    }

    Symbols symbolsWithTwoSymbolKinds(ClangBackEnd::SymbolKind symbolKind1,
                                      ClangBackEnd::SymbolKind symbolKind2,
                                      Utils::SmallStringView searchTerm) const
    {
        ReadStatement &statement = m_statementFactory.selectSymbolsForKindAndStartsWith2;

        return statement.template values<Symbol, 3>(100, int(symbolKind1), int(symbolKind2), searchTerm);
    }

    Symbols symbolsWithThreeSymbolKinds(ClangBackEnd::SymbolKind symbolKind1,
                                        ClangBackEnd::SymbolKind symbolKind2,
                                        ClangBackEnd::SymbolKind symbolKind3,
                                        Utils::SmallStringView searchTerm) const
    {
        ReadStatement &statement = m_statementFactory.selectSymbolsForKindAndStartsWith3;

        return statement.template values<Symbol, 3>(100, int(symbolKind1), int(symbolKind2), int(symbolKind3), searchTerm);
    }

    Symbols symbols(const ClangBackEnd::SymbolKinds &symbolKinds,
                    Utils::SmallStringView searchTerm) const override
    {
        switch (symbolKinds.size())
        {
        case 1: return symbolsWithOneSymbolKinds(symbolKinds[0], searchTerm);
        case 2: return symbolsWithTwoSymbolKinds(symbolKinds[0], symbolKinds[1], searchTerm);
        case 3: return symbolsWithThreeSymbolKinds(symbolKinds[0], symbolKinds[1], symbolKinds[2], searchTerm);
        }

        return Symbols();
    }

    Utils::optional<SourceLocation> locationForSymbolId(SymbolId symbolId,
                                                        ClangBackEnd::SourceLocationKind kind) const override
    {
        ReadStatement &statement = m_statementFactory.selectLocationOfSymbol;

        return statement.template value<SourceLocation, 3>(symbolId, int(kind));
    }
private:
    StatementFactory &m_statementFactory;
};

} // namespace ClangRefactoring
