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** Copyright (C) 2017 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 "symbolstorageinterface.h"

#include <sqliteexception.h>
#include <sqlitetransaction.h>
#include <filepathcachingfwd.h>

#include <QJsonDocument>
#include <QJsonArray>

namespace ClangBackEnd {

template <typename StatementFactory>
class SymbolStorage final : public SymbolStorageInterface
{
    using ReadStatement = typename StatementFactory::ReadStatementType;
    using WriteStatement = typename StatementFactory::WriteStatementType;
    using Database = typename StatementFactory::DatabaseType;

public:
    SymbolStorage(StatementFactory &statementFactory,
                  FilePathCachingInterface &filePathCache)
        : m_statementFactory(statementFactory),
          m_filePathCache(filePathCache)
    {
    }

    void addSymbolsAndSourceLocations(const SymbolEntries &symbolEntries,
                                      const SourceLocationEntries &sourceLocations) override
    {
        fillTemporarySymbolsTable(symbolEntries);
        fillTemporaryLocationsTable(sourceLocations);
        addNewSymbolsToSymbols();
        syncNewSymbolsFromSymbols();
        syncSymbolsIntoNewLocations();
        deleteAllLocationsFromUpdatedFiles();
        insertNewLocationsInLocations();
        deleteNewSymbolsTable();
        deleteNewLocationsTable();
    }

    void insertOrUpdateProjectPart(Utils::SmallStringView projectPartName,
                                   const Utils::SmallStringVector &commandLineArguments,
                                   const Utils::SmallStringVector &macroNames) override
    {
        m_statementFactory.database.setLastInsertedRowId(-1);

        Utils::SmallString compilerArguementsAsJson = toJson(commandLineArguments);
        Utils::SmallString macroNamesAsJson = toJson(macroNames);

        WriteStatement &insertStatement = m_statementFactory.insertProjectPartStatement;
        insertStatement.write(projectPartName, compilerArguementsAsJson, macroNamesAsJson);

        if (m_statementFactory.database.lastInsertedRowId() == -1) {
            WriteStatement &updateStatement = m_statementFactory.updateProjectPartStatement;
            updateStatement.write(compilerArguementsAsJson, macroNamesAsJson, projectPartName);
        }
    }

    Utils::optional<ProjectPartArtefact> fetchProjectPartArtefact(FilePathId sourceId) const override
    {
        ReadStatement &statement = m_statementFactory.getProjectPartCompilerArgumentsAndMacroNames;

        return statement.template value<ProjectPartArtefact, 3>(sourceId.filePathId);
    }

    void insertOrUpdateUsedMacros(const UsedMacros &usedMacros) override
    {
        WriteStatement &insertStatement = m_statementFactory.insertIntoNewUsedMacrosStatement;
        for (const UsedMacro &usedMacro : usedMacros)
            insertStatement.write(usedMacro.filePathId.filePathId, usedMacro.macroName);

        m_statementFactory.syncNewUsedMacrosStatement.execute();
        m_statementFactory.deleteOutdatedUsedMacrosStatement.execute();
        m_statementFactory.deleteNewUsedMacrosTableStatement.execute();
    }

    void insertOrUpdateSourceDependencies(const SourceDependencies &sourceDependencies) override
    {
        WriteStatement &insertStatement = m_statementFactory.insertIntoNewSourceDependenciesStatement;
        for (SourceDependency sourceDependency : sourceDependencies)
            insertStatement.write(sourceDependency.filePathId.filePathId,
                                  sourceDependency.dependencyFilePathId.filePathId);

        m_statementFactory.syncNewSourceDependenciesStatement.execute();
        m_statementFactory.deleteOutdatedSourceDependenciesStatement.execute();
        m_statementFactory.deleteNewSourceDependenciesStatement.execute();
    }

    void updateProjectPartSources(Utils::SmallStringView projectPartName,
                                  const FilePathIds &sourceFilePathIds) override
    {
        ReadStatement &getProjectPartIdStatement = m_statementFactory.getProjectPartIdStatement;
        int projectPartId = getProjectPartIdStatement.template value<int>(projectPartName).value();

        updateProjectPartSources(projectPartId, sourceFilePathIds);
    }

    void updateProjectPartSources(int projectPartId,
                                  const FilePathIds &sourceFilePathIds) override
    {
        WriteStatement &deleteStatement = m_statementFactory.deleteAllProjectPartsSourcesWithProjectPartIdStatement;
        deleteStatement.write(projectPartId);

        WriteStatement &insertStatement = m_statementFactory.insertProjectPartSourcesStatement;
        for (const FilePathId &sourceFilePathId : sourceFilePathIds)
            insertStatement.write(projectPartId, sourceFilePathId.filePathId);
    }

    void insertFileStatuses(const FileStatuses &fileStatuses)
    {
        WriteStatement &statement = m_statementFactory.insertFileStatuses;

        for (const FileStatus &fileStatus : fileStatuses)
            statement.write(fileStatus.filePathId.filePathId,
                            fileStatus.size,
                            fileStatus.lastModified);
    }

    static Utils::SmallString toJson(const Utils::SmallStringVector &strings)
    {
        QJsonDocument document;
        QJsonArray array;

        std::transform(strings.begin(), strings.end(), std::back_inserter(array), [] (const auto &string) {
            return QJsonValue(string.data());
        });

        document.setArray(array);

        return document.toJson(QJsonDocument::Compact);
    }

    void fillTemporarySymbolsTable(const SymbolEntries &symbolEntries)
    {
        WriteStatement &statement = m_statementFactory.insertSymbolsToNewSymbolsStatement;

        for (const auto &symbolEntry : symbolEntries) {
            statement.write(symbolEntry.first,
                            symbolEntry.second.usr,
                            symbolEntry.second.symbolName);
        }
    }

    void fillTemporaryLocationsTable(const SourceLocationEntries &sourceLocations)
    {
        WriteStatement &statement = m_statementFactory.insertLocationsToNewLocationsStatement;

        for (const auto &locationsEntry : sourceLocations) {
            statement.write(locationsEntry.symbolId,
                            locationsEntry.lineColumn.line,
                            locationsEntry.lineColumn.column,
                            locationsEntry.filePathId.filePathId);
        }
    }

    void addNewSymbolsToSymbols()
    {
        m_statementFactory.addNewSymbolsToSymbolsStatement.execute();
    }

    void syncNewSymbolsFromSymbols()
    {
        m_statementFactory.syncNewSymbolsFromSymbolsStatement.execute();
    }

    void syncSymbolsIntoNewLocations()
    {
        m_statementFactory.syncSymbolsIntoNewLocationsStatement.execute();
    }

    void deleteAllLocationsFromUpdatedFiles()
    {
        m_statementFactory.deleteAllLocationsFromUpdatedFilesStatement.execute();
    }

    void insertNewLocationsInLocations()
    {
        m_statementFactory.insertNewLocationsInLocationsStatement.execute();
    }

    void deleteNewSymbolsTable()
    {
        m_statementFactory.deleteNewSymbolsTableStatement.execute();
    }

    void deleteNewLocationsTable()
    {
        m_statementFactory.deleteNewLocationsTableStatement.execute();
    }

    SourceLocationEntries sourceLocations() const
    {
        return SourceLocationEntries();
    }

private:
    StatementFactory &m_statementFactory;
    FilePathCachingInterface &m_filePathCache;
};

} // namespace ClangBackEnd