package processor

import "time"

type ProcessorInformation struct {
	IdleTimeSinceBoot   uint64
	KernelTimeSinceBoot uint64
	UserTimeSinceBoot   uint64
}

func (procInfo ProcessorInformation) Usage() (
	TotalCPUUsage float64,
	KernelCPUUsage float64,
	UserCPUUsage float64,
	IdleCPUUsage float64,
) {
	first := GetCPUInformation()
	time.Sleep(time.Second)
	second := GetCPUInformation()

	deltaIdleTime := second.IdleTimeSinceBoot - first.IdleTimeSinceBoot
	deltaKernelTime := second.KernelTimeSinceBoot - first.KernelTimeSinceBoot
	deltaUserTime := second.UserTimeSinceBoot - first.UserTimeSinceBoot
	deltaTotalTime := deltaIdleTime + deltaKernelTime + deltaUserTime

	if deltaTotalTime > 0 {
		TotalCPUUsage = ((float64(deltaKernelTime) + float64(deltaUserTime)) / float64(deltaTotalTime)) * 100
		UserCPUUsage = (float64(deltaUserTime) / float64(deltaTotalTime)) * 100
		KernelCPUUsage = (float64(deltaKernelTime) / float64(deltaTotalTime)) * 100
		IdleCPUUsage = (float64(deltaIdleTime) / float64(deltaTotalTime)) * 100
	}

	return TotalCPUUsage, KernelCPUUsage, UserCPUUsage, IdleCPUUsage
}