You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: gcron_schedule_fix.go
    path of file: ./repos/gf/os/gcron
    
    the code of the file until where you have to start completion: // Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
//
// This Source Code Form is subject to the terms of the MIT L
    
func (s *cronSchedule) getAndUpdateLastCheckTimestamp(ctx context.Context, t time.Time) int64 {
	var (
		currentTimestamp   = t.Unix()
		lastCheckTimestamp = s.lastCheckTimestamp.Val()
	)
	switch {
	// Often happens, timer triggers in the same second.
	// Example:
	// lastCheckTimestamp:    10
	// currentTimestamp: 10
	case
		lastCheckTimestamp == currentTimestamp:
		lastCheckTimestamp += 1

	// Often happens, no latency.
	// Example:
	// lastCheckTimestamp:    9
	// currentTimestamp: 10
	case
		lastCheckTimestamp == currentTimestamp-1:
		lastCheckTimestamp = currentTimestamp

	// Latency in 3 seconds, which can be tolerant.
	// Example:
	// lastCheckTimestamp:    7/8
	// currentTimestamp: 10
	case
		lastCheckTimestamp == currentTimestamp-2,
		lastCheckTimestamp == currentTimestamp-3:
		lastCheckTimestamp += 1

	// Too much latency, it ignores the fix, the cron job might not be triggered.
	default:
		// Too much delay, let's update the last timestamp to current one.
		intlog.Printf(
			ctx,
			`too much latency, last timestamp "%d", current "%d", latency "%d"`,
			lastCheckTimestamp, currentTimestamp, currentTimestamp-lastCheckTimestamp,
		)
		lastCheckTimestamp = currentTimestamp
	}
	s.lastCheckTimestamp.Set(lastCheckTimestamp)
	return lastCheckTimestamp
}