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using DataKit.SQL.Postgresql.QueryExpressions;

using DataKit.SQL.Providers;

using DataKit.SQL.QueryExpressions;

namespace DataKit.SQL.Postgresql

{

public class PostgresqlQueryWriter : QueryWriter

{

public void Append(string str)

=> queryText.Append(str);

public override void WriteRandomFunction(RandomFunctionCallQueryExpression randomFunctionCallQueryExpression, QueryExpressionVisitor queryExpressionVisitor)

{

queryText.Append($" FLOOR(RANDOM() * {int.MaxValue})::int ");

}

public override void WriteLastInsertedIdFunction(LastInsertedIdFunctionCallExpression lastInsertedIdFunctionCallExpression, QueryExpressionVisitor queryExpressionVisitor)

{

queryText.Append(" LASTVAL() ");

}

public override void WriteIdentifier(IdentifierQueryExpression identifierQueryExpression, QueryExpressionVisitor queryExpressionVisitor)

{

if (identifierQueryExpression is NestedIdentifierQueryExpression nestedIdentifierQueryExpression &&

nestedIdentifierQueryExpression.ParentIdentifier != null)

{

WriteIdentifier(nestedIdentifierQueryExpression.ParentIdentifier, queryExpressionVisitor);

queryText.Append(".");

}

if (identifierQueryExpression.IdentifierName == "*")

queryText.Append(" * ");

else

queryText.Append($" \"{identifierQueryExpression.IdentifierName}\" ");

}

public override void WriteExtension(QueryExpression queryExpression, QueryExpressionVisitor queryExpressionVisitor)

{

if (queryExpression is IPostgresqlExtension postgresqlExtension)

postgresqlExtension.Write(this, queryExpressionVisitor);

base.WriteExtension(queryExpression, queryExpressionVisitor);

}

}

}