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#ifndef COMPLETIONCOMPARER_H
#define COMPLETIONCOMPARER_H
#include "expectedtoken.h"
#include "selectresolver.h"
class CompletionHelper;
class CompletionComparer
{
public:
explicit CompletionComparer(CompletionHelper* helper);
bool operator()(const ExpectedTokenPtr& token1, const ExpectedTokenPtr& token2);
private:
CompletionHelper* helper = nullptr;
/**
* @brief contextDatabases
* Context objects are any names mentioned anywhere in the query at the same level as completion takes place.
* The level means the sub-query level, for example in case of sub selects.
*/
QStringList contextDatabases;
QStringList contextTables;
QStringList contextColumns;
/**
* @brief parentContextDatabases
* Parent context objects are any names mentioned anywhere in the the query at all upper levels.
*/
QStringList parentContextDatabases;
QStringList parentContextTables;
QStringList parentContextColumns;
QList<SelectResolver::Column> resultColumns;
/**
* @brief availableTableNames
* Names of all tables mentioned in FROM clause in the current and all parent select cores.
*/
QStringList availableTableNames;
void init();
bool initSelect();
bool compareColumns(const ExpectedTokenPtr& token1, const ExpectedTokenPtr& token2);
bool compareColumnsForSelectResCol(const ExpectedTokenPtr& token1, const ExpectedTokenPtr& token2, bool* result);
bool compareColumnsForUpdateCol(const ExpectedTokenPtr& token1, const ExpectedTokenPtr& token2, bool* result);
bool compareColumnsForDeleteCol(const ExpectedTokenPtr& token1, const ExpectedTokenPtr& token2, bool* result);
bool compareColumnsForCreateTable(const ExpectedTokenPtr& token1, const ExpectedTokenPtr& token2, bool* result);
bool compareColumnsForReturning(const ExpectedTokenPtr& token1, const ExpectedTokenPtr& token2, bool* result);
bool compareTables(const ExpectedTokenPtr& token1, const ExpectedTokenPtr& token2);
bool compareIndexes(const ExpectedTokenPtr& token1, const ExpectedTokenPtr& token2);
bool compareTriggers(const ExpectedTokenPtr& token1, const ExpectedTokenPtr& token2);
bool compareViews(const ExpectedTokenPtr& token1, const ExpectedTokenPtr& token2);
bool compareDatabases(const ExpectedTokenPtr& token1, const ExpectedTokenPtr& token2);
bool compareValues(const ExpectedTokenPtr& token1, const ExpectedTokenPtr& token2, bool handleSystemNames = false);
bool compareValues(const QString& token1, const QString& token2, bool handleSystemNames = false);
bool compareByContext(const QString &token1, const QString &token2,
const QStringList& contextValues, bool* ok = nullptr);
bool compareByContext(const QString &token1, const QString &token2,
const QList<QStringList>& contextValues, bool* ok = nullptr);
bool compareByContext(const QString &token1, const QString &token2,
const QStringList& contextValues, bool handleSystemNames, bool* ok = nullptr);
bool compareByContext(const QString &token1, const QString &token2,
const QList<QStringList>& contextValues, bool handleSystemNames, bool* ok = nullptr);
bool compareByContextOnly(const QString &token1, const QString &token2,
const QStringList& contextValues, bool handleSystemNames, bool* ok);
bool isTokenOnAvailableColumnList(const ExpectedTokenPtr& token);
bool isTokenOnParentAvailableColumnList(const ExpectedTokenPtr& token);
bool isTokenOnResultColumns(const ExpectedTokenPtr& token);
static bool isTokenOnColumnList(const ExpectedTokenPtr& token, const QList<SelectResolver::Column>& columnList);
};
#endif // COMPLETIONCOMPARER_H
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