package models

import (
	"fmt"
	"net/http"
	"sort"
	"strconv"

	"github.com/shirou/gopsutil/v3/cpu"
	"github.com/shirou/gopsutil/v3/mem"
)

type HtopTable struct {
	Processes    []Process
	CurrentSort  string
	CurrentOrder string
}

func NewTable() (*HtopTable, error) {
	processes, err := GetProcesses()
	if err != nil {
		return &HtopTable{}, err
	}
	return &HtopTable{
		Processes: processes,
	}, nil
}

func (t *HtopTable) UpdateTable() error {
	var err error
	t.Processes, err = GetProcesses()
	if err != nil {
		return err
	}
	return nil
}

func (t *HtopTable) Sort(r *http.Request) {
	sortBy := r.URL.Query().Get("sort")
	order := r.URL.Query().Get("order")

	if order == "desc" {
		t.CurrentOrder = "desc"
	} else {
		t.CurrentOrder = "asc"
	}

	t.CurrentSort = sortBy

	sort.Slice(t.Processes, func(i, j int) bool {
		switch sortBy {
		case "pid":
			pidI, _ := strconv.Atoi(t.Processes[i].PID)
			pidJ, _ := strconv.Atoi(t.Processes[j].PID)
			if t.CurrentOrder == "desc" {
				return pidI > pidJ
			}
			return pidI < pidJ
		case "user":
			if t.CurrentOrder == "desc" {
				return t.Processes[i].User > t.Processes[j].User
			}
			return t.Processes[i].User < t.Processes[j].User
		case "cmd":
			if t.CurrentOrder == "desc" {
				return t.Processes[i].Cmd > t.Processes[j].Cmd
			}
			return t.Processes[i].Cmd < t.Processes[j].Cmd
		case "cpu":
			if t.CurrentOrder == "desc" {
				return t.Processes[i].CPU > t.Processes[j].CPU
			}
			return t.Processes[i].CPU < t.Processes[j].CPU
		case "memory":
			if t.CurrentOrder == "desc" {
				return t.Processes[i].Memory > t.Processes[j].Memory
			}
			return t.Processes[i].Memory < t.Processes[j].Memory
		default:
			return true
		}
	})
}

func GetSystemUsage() (cpuPercent float64, memPercent float64, err error) {
	cpuPercents, err := cpu.Percent(0, false)
	if err != nil {
		return 0, 0, err
	}

	if len(cpuPercents) == 0 {
		return 0, 0, fmt.Errorf("cpu.Percent returned empty slice")
	}

	vmStat, err := mem.VirtualMemory()
	if err != nil {
		return 0, 0, err
	}

	return cpuPercents[0], vmStat.UsedPercent, nil
}