package cpu

import (
	"encoding/json"
	"runtime"
	"strconv"
	"strings"
	"sync"

	"github.com/shirou/gopsutil/internal/common"
)

type TimesStat struct {
	CPU       string  `json:"cpu"`
	User      float64 `json:"user"`
	System    float64 `json:"system"`
	Idle      float64 `json:"idle"`
	Nice      float64 `json:"nice"`
	Iowait    float64 `json:"iowait"`
	Irq       float64 `json:"irq"`
	Softirq   float64 `json:"softirq"`
	Steal     float64 `json:"steal"`
	Guest     float64 `json:"guest"`
	GuestNice float64 `json:"guestNice"`
	Stolen    float64 `json:"stolen"`
}

type InfoStat struct {
	CPU        int32    `json:"cpu"`
	VendorID   string   `json:"vendorId"`
	Family     string   `json:"family"`
	Model      string   `json:"model"`
	Stepping   int32    `json:"stepping"`
	PhysicalID string   `json:"physicalId"`
	CoreID     string   `json:"coreId"`
	Cores      int32    `json:"cores"`
	ModelName  string   `json:"modelName"`
	Mhz        float64  `json:"mhz"`
	CacheSize  int32    `json:"cacheSize"`
	Flags      []string `json:"flags"`
}

type lastPercent struct {
	sync.Mutex
	lastCPUTimes    []TimesStat
	lastPerCPUTimes []TimesStat
}

var lastCPUPercent lastPercent
var invoke common.Invoker

func init() {
	invoke = common.Invoke{}
	lastCPUPercent.Lock()
	lastCPUPercent.lastCPUTimes, _ = Times(false)
	lastCPUPercent.lastPerCPUTimes, _ = Times(true)
	lastCPUPercent.Unlock()
}

func Counts(logical bool) (int, error) {
	return runtime.NumCPU(), nil
}

func (c TimesStat) String() string {
	v := []string{
		`"cpu":"` + c.CPU + `"`,
		`"user":` + strconv.FormatFloat(c.User, 'f', 1, 64),
		`"system":` + strconv.FormatFloat(c.System, 'f', 1, 64),
		`"idle":` + strconv.FormatFloat(c.Idle, 'f', 1, 64),
		`"nice":` + strconv.FormatFloat(c.Nice, 'f', 1, 64),
		`"iowait":` + strconv.FormatFloat(c.Iowait, 'f', 1, 64),
		`"irq":` + strconv.FormatFloat(c.Irq, 'f', 1, 64),
		`"softirq":` + strconv.FormatFloat(c.Softirq, 'f', 1, 64),
		`"steal":` + strconv.FormatFloat(c.Steal, 'f', 1, 64),
		`"guest":` + strconv.FormatFloat(c.Guest, 'f', 1, 64),
		`"guestNice":` + strconv.FormatFloat(c.GuestNice, 'f', 1, 64),
		`"stolen":` + strconv.FormatFloat(c.Stolen, 'f', 1, 64),
	}

	return `{` + strings.Join(v, ",") + `}`
}

// Total returns the total number of seconds in a CPUTimesStat
func (c TimesStat) Total() float64 {
	total := c.User + c.System + c.Nice + c.Iowait + c.Irq + c.Softirq + c.Steal +
		c.Guest + c.GuestNice + c.Idle + c.Stolen
	return total
}

func (c InfoStat) String() string {
	s, _ := json.Marshal(c)
	return string(s)
}