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/*******************************************************************
 * © 2023 SAP SE or an SAP affiliate company. All rights reserved. *
 *******************************************************************/
package com.sap.cds.jdbc.sqlite.functions;

import static com.sap.cds.jdbc.spi.SessionVariableSetter.APPLICATIONUSER;
import static com.sap.cds.jdbc.spi.SessionVariableSetter.LOCALE;
import static com.sap.cds.jdbc.spi.SessionVariableSetter.TENANT;
import static com.sap.cds.jdbc.spi.SessionVariableSetter.VALID_FROM;
import static com.sap.cds.jdbc.spi.SessionVariableSetter.VALID_TO;

import java.sql.SQLException;
import java.util.Map;

import org.sqlite.Function;

/**
 * Emulate session context function on HANA.
 */
public class SessionContextFunction extends Function {

	private Map contextVariables;

	public SessionContextFunction(Map contextVariables) {
		this.contextVariables = contextVariables;
	}

	@Override
	protected void xFunc() throws SQLException {
		String sqliteKey = value_text(0);
		String key = switch (sqliteKey) {
			case "$user.id" -> APPLICATIONUSER;
			case "$user.locale" -> LOCALE;
			case "$tenant" -> TENANT;
			case "$valid.from", "$at.from" -> VALID_FROM;
			case "$valid.to", "$at.to" -> VALID_TO;
			default -> null;
		};
		Object val = contextVariables.get(key);
		if (val != null) {
			result(val.toString());
		} else {
			result();
		}
	}

}