review pass for Event Quest cycling

server/channelserver/handlers_quest.go

@@ -230,61 +230,57 @@ func makeEventQuest(s *Session, rows *sql.Rows) ([]byte, error) {
 	return bf.Data(), nil
 }
 
-func calculateNumberOfCycles(duration time.Duration, lastStartTime time.Time) int {
-	timeDifference := time.Now().Sub(lastStartTime)
-	numberOfCycles := int(timeDifference.Nanoseconds() / int64(duration))
-	return numberOfCycles
-}
-
 func handleMsgMhfEnumerateQuest(s *Session, p mhfpacket.MHFPacket) {
 	pkt := p.(*mhfpacket.MsgMhfEnumerateQuest)
 	var totalCount, returnedCount uint16
 	bf := byteframe.NewByteFrame()
 	bf.WriteUint16(0)
 
-	currentTime := time.Now()
+	rows, err := s.server.db.Query("SELECT id, COALESCE(max_players, 4) AS max_players, quest_type, quest_id, COALESCE(mark, 0) AS mark, COALESCE(flags, -1), start_time, COALESCE(active_duration, 0) AS active_duration, COALESCE(inactive_duration, 0) AS inactive_duration FROM event_quests ORDER BY quest_id")
+	if err == nil {
+		currentTime := time.Now()
+		tx, _ := s.server.db.Begin()
 
-	// Check the event_quests table to load the quests with rotation system
-	rows, err := s.server.db.Query("SELECT id, COALESCE(max_players, 4) AS max_players, quest_type, quest_id, COALESCE(mark, 0) AS mark, COALESCE(flags, -1), start_time, COALESCE(active_duration, 1) AS active_duration, COALESCE(inactive_duration, 0) AS inactive_duration FROM event_quests ORDER BY quest_id")
-	if err != nil {
-		return
-	}
-	defer rows.Close()
+		for rows.Next() {
+			var id, mark uint32
+			var questId, flags, activeDuration, inactiveDuration int
+			var maxPlayers, questType uint8
+			var startTime time.Time
 
-	// Commit event quest changes to a transaction instead of doing it one by one for to help with performance
-	transaction, _ := s.server.db.Begin()
-  
-	for rows.Next() {
-		var id, mark uint32
-		var questId int
-		var maxPlayers, flags, questType, activeDuration, inactiveDuration uint8
-		var startTime time.Time
-
-		err := rows.Scan(&id, &maxPlayers, &questType, &questId, &mark, &flags, &startTime, &activeDuration, &inactiveDuration)
-		if err != nil {
-			continue
-		}
-
-		// Count the number of cycles necessary to align quest with the correct date range.
-		cycleCount := calculateNumberOfCycles(time.Duration(activeDuration+inactiveDuration)*24*time.Hour, startTime)
-
-		// Calculate the rotation time based on start time, active duration, and inactive duration.
-		rotationTime := startTime.Add(time.Duration(activeDuration+inactiveDuration) * 24 * time.Duration(cycleCount) * time.Hour)
-		if currentTime.After(rotationTime) {
-			// take the rotationTime and normalize it to midnight as to align with the ingame message for event quest rotation.
-			newRotationTime := time.Date(rotationTime.Year(), rotationTime.Month(), rotationTime.Day(), 0, 0, 0, 0, rotationTime.Location())
-			newRotationTime = newRotationTime.Add(time.Duration(TimeMidnight().Add(13 * time.Hour).Nanosecond()))
-
-			_, err := transaction.Exec("UPDATE event_quests SET start_time = $1 WHERE id = $2", newRotationTime, id)
+			err = rows.Scan(&id, &maxPlayers, &questType, &questId, &mark, &flags, &startTime, &activeDuration, &inactiveDuration)
 			if err != nil {
-				transaction.Rollback() // Rollback if an error occurs
-				break
+				continue
+			}
+
+			// Use the Event Cycling system
+			if activeDuration > 0 {
+				cycleLength := (time.Duration(activeDuration) + time.Duration(inactiveDuration)) * 24 * time.Hour
+
+				// Count the number of full cycles elapsed since the last rotation.
+				extraCycles := int(currentTime.Sub(startTime) / cycleLength)
+
+				if extraCycles > 0 {
+					// Calculate the rotation time based on start time, active duration, and inactive duration.
+					rotationTime := startTime.Add(time.Duration(activeDuration+inactiveDuration) * 24 * time.Hour * time.Duration(extraCycles))
+					if currentTime.After(rotationTime) {
+						// Normalize rotationTime to 12PM JST to align with the in-game events update notification.
+						newRotationTime := time.Date(rotationTime.Year(), rotationTime.Month(), rotationTime.Day(), 12, 0, 0, 0, TimeAdjusted().Location())
+
+						_, err = tx.Exec("UPDATE event_quests SET start_time = $1 WHERE id = $2", newRotationTime, id)
+						if err != nil {
+							tx.Rollback() // Rollback if an error occurs
+							break
+						}
+						startTime = newRotationTime // Set the new start time so the quest can be used/removed immediately.
+					}
+				}
+
+				// Check if the quest is currently active
+				if currentTime.Before(startTime) || currentTime.After(startTime.Add(time.Duration(activeDuration)*24*time.Hour)) {
+					break
+				}
 			}
-			startTime = newRotationTime // Set the new start time so the quest can be used/removed immediately.
-		}
 
-		// Check if the quest is currently active
-		if currentTime.After(startTime) && currentTime.Sub(startTime) <= time.Duration(activeDuration)*24*time.Hour {
 			data, err := makeEventQuest(s, rows)
 			if err != nil {
 				continue
@@ -301,10 +297,10 @@ func handleMsgMhfEnumerateQuest(s *Session, p mhfpacket.MHFPacket) {
 				}
 			}
 		}
-	}
 
-	// Commit transaction so to write to the database.
-	transaction.Commit()
+		rows.Close()
+		tx.Commit()
+	}
 
 	type tuneValue struct {
 		ID    uint16