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 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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//
// Accepts a vote, enforcing business logic: make sure the vote is for a valid
// contestant and that the voter (phone number of the caller) is not above the
// number of allowed votes.
//

package edu.brown.benchmark.voter.procedures;

import org.voltdb.ProcInfo;
import org.voltdb.SQLStmt;
import org.voltdb.VoltProcedure;
import org.voltdb.VoltTable;
import org.voltdb.types.TimestampType;

import edu.brown.benchmark.voter.VoterConstants;

@ProcInfo (
    partitionInfo = "votes.phone_number:1",
    singlePartition = true
)
public class Vote extends VoltProcedure {
	
    // Checks if the vote is for a valid contestant
    public final SQLStmt checkContestantStmt = new SQLStmt(
	   "SELECT contestant_number FROM contestants WHERE contestant_number = ?;"
    );
	
    // Checks if the voter has exceeded their allowed number of votes
    public final SQLStmt checkVoterStmt = new SQLStmt(
		"SELECT num_votes FROM v_votes_by_phone_number WHERE phone_number = ?;"
    );
	
    // Checks an area code to retrieve the corresponding state
    public final SQLStmt checkStateStmt = new SQLStmt(
		"SELECT state FROM area_code_state WHERE area_code = ?;"
    );
	
    // Records a vote
    public final SQLStmt insertVoteStmt = new SQLStmt(
		"INSERT INTO votes (vote_id, phone_number, state, contestant_number, created) VALUES (?, ?, ?, ?, ?);"
    );
	
    public long run(long voteId, long phoneNumber, int contestantNumber, long maxVotesPerPhoneNumber) {
		
        // Queue up validation statements
        voltQueueSQL(checkContestantStmt, contestantNumber);
        voltQueueSQL(checkVoterStmt, phoneNumber);
        voltQueueSQL(checkStateStmt, (short)(phoneNumber / 100000000l));
        VoltTable validation[] = voltExecuteSQL();
		
        if (validation[0].getRowCount() == 0) {
            return VoterConstants.ERR_INVALID_CONTESTANT;
        }
		
        if ((validation[1].getRowCount() == 1) &&
			(validation[1].asScalarLong() >= maxVotesPerPhoneNumber)) {
            return VoterConstants.ERR_VOTER_OVER_VOTE_LIMIT;
        }
		
        // Some sample client libraries use the legacy random phone generation that mostly
        // created invalid phone numbers. Until refactoring, re-assign all such votes to
        // the "XX" fake state (those votes will not appear on the Live Statistics dashboard,
        // but are tracked as legitimate instead of invalid, as old clients would mostly get
        // it wrong and see all their transactions rejected).
        final String state = (validation[2].getRowCount() > 0) ? validation[2].fetchRow(0).getString(0) : "XX";
		 		
        // Post the vote
        TimestampType timestamp = new TimestampType();
        voltQueueSQL(insertVoteStmt, voteId, phoneNumber, state, contestantNumber, timestamp);
        voltExecuteSQL(true);
		
        // Set the return value to 0: successful vote
        return VoterConstants.VOTE_SUCCESSFUL;
    }
}