#include "PgAttribute.h"
#include "QStringBuilder"
#include "SqlFormattingUtils.h"
#include "PgClass.h"
#include "PgDatabaseCatalog.h"
#include "PgTypeContainer.h"
#include "PgCollation.h"
#include "PgCollationContainer.h"

QString PgAttribute::columnDefinition(const PgDatabaseCatalog &cat) const
{
	// create: column_name data_type [ COLLATE collation ] [ column_constraint [ ... ]
	// alter:  column_name data_type [ COLLATE collation ] [ column_constraint [ ... ]
	// constraints NULL/NOT NULL, DEFAULT, GENERATED other constraints will be ignored here a
	auto&& type = cat.types()->getByKey(typid);

	QString sql = quoteIdent(name) % " " % type->name;
	if (collation != InvalidOid) {
		auto&& col = cat.collations()->getByKey(collation);
		QString oname = col->objectName();
		if (oname != "default")
			sql += " COLLATE " % quoteIdent(oname);
	}

	if (notnull)
		sql += " NOT NULL";

	if (hasdef)
		sql += " DEFAULT " % defaultValue;

	if (identity != ' ') {
		sql += " GENERATED ";
		if (identity == 'a') sql += "ALWAYS";
		else if (identity == 'd') sql += "BY DEFAULT";
		sql += " AS IDENTITY";
	}
	// TODO sequence options might be missing

	return sql;
}

QString PgAttribute::alterTableAddColumn(const PgDatabaseCatalog &cat, const PgClass &table) const
{
	QString sql = "ALTER TABLE " % table.fullyQualifiedQuotedObjectName()
			% " ADD COLUMN " % columnDefinition(cat) % ";";
	return sql;
}

QString PgAttribute::alterTableDropColumn(const PgDatabaseCatalog &cat, const PgClass &table) const
{
	QString sql = "ALTER TABLE " % table.fullyQualifiedQuotedObjectName()
			% " DROP COLUMN " % quoteIdent(name) % ";";
	return sql;
}