package gupta

import (
	"fmt"
	"strconv"
	"strings"
)

const version = "0.0.1"

func Hello() string {
	return fmt.Sprintf("Welcome to gupta version %s", version)
}

func Run(load, cpu, memory bool, partition, networkInterface string) (cpuLoad, cpuUsage, memoryUsage float64) {
	cpuLoad = 0.2
	cpuUsage = 0.2
	memoryUsage = 70.0
	return cpuLoad, cpuUsage, memoryUsage
}

type GuptaReport struct {
	cpuLoad     float64
	cpuUsage    float64
	memoryUsage float64
}

func (g *GuptaReport) GetCPULoad() string {
	return fmt.Sprintf("%.2f", g.cpuLoad)
}

// collect all CPU stat from /proc/cpustat
type CPUStat struct {
	user       uint64
	nice       uint64
	system     uint64
	idle       uint64
	iowait     uint64
	irq        uint64
	softirq    uint64
	steal      uint64
	guest      uint64
	guest_nice uint64
}

// parse the first line of /proc/cpustat
func (c *CPUStat) ReadInfo(rawInfo []string) {
	if s, err := strconv.ParseUint(rawInfo[0], 10, 64); err == nil {
		c.user = s
	}
	if s, err := strconv.ParseUint(rawInfo[1], 10, 64); err == nil {
		c.nice = s
	}
	if s, err := strconv.ParseUint(rawInfo[2], 10, 64); err == nil {
		c.system = s
	}
	if s, err := strconv.ParseUint(rawInfo[3], 10, 64); err == nil {
		c.idle = s
	}
	if s, err := strconv.ParseUint(rawInfo[4], 10, 64); err == nil {
		c.iowait = s
	}
	if s, err := strconv.ParseUint(rawInfo[5], 10, 64); err == nil {
		c.irq = s
	}
	if s, err := strconv.ParseUint(rawInfo[6], 10, 64); err == nil {
		c.softirq = s
	}
	if s, err := strconv.ParseUint(rawInfo[7], 10, 64); err == nil {
		c.steal = s
	}
	if s, err := strconv.ParseUint(rawInfo[8], 10, 64); err == nil {
		c.guest = s
	}
	if s, err := strconv.ParseUint(rawInfo[9], 10, 64); err == nil {
		c.guest_nice = s
	}
}

func (c *CPUStat) TotalTime() uint64 {
	return c.user + c.nice + c.system + c.idle + c.iowait + c.irq + c.softirq + c.steal
}

func (c *CPUStat) IdleTime() uint64 {
	return c.idle + c.iowait
}

func NewCPUStat(procstatline string) CPUStat {
	cpustat := CPUStat{}
	statline := strings.Fields(procstatline)
	cpustat.ReadInfo(statline[1:])
	return cpustat
}