// PutScalingPolicy seems to require all params to be resent, so create and update can share this common function
func getAwsAutoscalingPutScalingPolicyInput(d *schema.ResourceData) autoscaling.PutScalingPolicyInput {
	var params = autoscaling.PutScalingPolicyInput{
		AutoScalingGroupName: aws.String(d.Get("autoscaling_group_name").(string)),
		PolicyName:           aws.String(d.Get("name").(string)),
	}

	if v, ok := d.GetOk("adjustment_type"); ok {
		params.AdjustmentType = aws.String(v.(string))
	}

	if v, ok := d.GetOk("cooldown"); ok {
		params.Cooldown = aws.Int64(int64(v.(int)))
	}

	if v, ok := d.GetOk("scaling_adjustment"); ok {
		params.ScalingAdjustment = aws.Int64(int64(v.(int)))
	}

	if v, ok := d.GetOk("min_adjustment_step"); ok {
		params.MinAdjustmentStep = aws.Int64(int64(v.(int)))
	}

	return params
}
// PutScalingPolicy can safely resend all parameters without destroying the
// resource, so create and update can share this common function. It will error
// if certain mutually exclusive values are set.
func getAwsAutoscalingPutScalingPolicyInput(d *schema.ResourceData) (autoscaling.PutScalingPolicyInput, error) {
	var params = autoscaling.PutScalingPolicyInput{
		AutoScalingGroupName: aws.String(d.Get("autoscaling_group_name").(string)),
		PolicyName:           aws.String(d.Get("name").(string)),
	}

	if v, ok := d.GetOk("adjustment_type"); ok {
		params.AdjustmentType = aws.String(v.(string))
	}

	if v, ok := d.GetOk("cooldown"); ok {
		params.Cooldown = aws.Int64(int64(v.(int)))
	}

	if v, ok := d.GetOk("estimated_instance_warmup"); ok {
		params.EstimatedInstanceWarmup = aws.Int64(int64(v.(int)))
	}

	if v, ok := d.GetOk("metric_aggregation_type"); ok {
		params.MetricAggregationType = aws.String(v.(string))
	}

	if v, ok := d.GetOk("policy_type"); ok {
		params.PolicyType = aws.String(v.(string))
	}

	if v, ok := d.GetOk("scaling_adjustment"); ok {
		params.ScalingAdjustment = aws.Int64(int64(v.(int)))
	}

	if v, ok := d.GetOk("step_adjustment"); ok {
		steps, err := expandStepAdjustments(v.(*schema.Set).List())
		if err != nil {
			return params, fmt.Errorf("metric_interval_lower_bound and metric_interval_upper_bound must be strings!")
		}
		params.StepAdjustments = steps
	}

	if v, ok := d.GetOk("min_adjustment_magnitude"); ok {
		// params.MinAdjustmentMagnitude = aws.Int64(int64(d.Get("min_adjustment_magnitude").(int)))
		params.MinAdjustmentMagnitude = aws.Int64(int64(v.(int)))
	} else if v, ok := d.GetOk("min_adjustment_step"); ok {
		// params.MinAdjustmentStep = aws.Int64(int64(d.Get("min_adjustment_step").(int)))
		params.MinAdjustmentStep = aws.Int64(int64(v.(int)))
	}

	// Validate our final input to confirm it won't error when sent to AWS.
	// First, SimpleScaling policy types...
	if *params.PolicyType == "SimpleScaling" && params.StepAdjustments != nil {
		return params, fmt.Errorf("SimpleScaling policy types cannot use step_adjustments!")
	}
	if *params.PolicyType == "SimpleScaling" && params.MetricAggregationType != nil {
		return params, fmt.Errorf("SimpleScaling policy types cannot use metric_aggregation_type!")
	}
	if *params.PolicyType == "SimpleScaling" && params.EstimatedInstanceWarmup != nil {
		return params, fmt.Errorf("SimpleScaling policy types cannot use estimated_instance_warmup!")
	}

	// Second, StepScaling policy types...
	if *params.PolicyType == "StepScaling" && params.ScalingAdjustment != nil {
		return params, fmt.Errorf("StepScaling policy types cannot use scaling_adjustment!")
	}
	if *params.PolicyType == "StepScaling" && params.Cooldown != nil {
		return params, fmt.Errorf("StepScaling policy types cannot use cooldown!")
	}

	return params, nil
}