import { Fragment, useEffect, useState } from 'react'

import { Progress } from '@janhq/uikit'
import { useAtom, useAtomValue } from 'jotai'
import { MonitorIcon, XIcon, ChevronDown, ChevronUp } from 'lucide-react'

import { twMerge } from 'tailwind-merge'

import { useClickOutside } from '@/hooks/useClickOutside'
import useGetSystemResources from '@/hooks/useGetSystemResources'

import { toGibibytes } from '@/utils/converter'

import TableActiveModel from './TableActiveModel'

import {
  cpuUsageAtom,
  gpusAtom,
  ramUtilitizedAtom,
  systemMonitorCollapseAtom,
  totalRamAtom,
  usedRamAtom,
} from '@/helpers/atoms/SystemBar.atom'

const SystemMonitor = () => {
  const totalRam = useAtomValue(totalRamAtom)
  const usedRam = useAtomValue(usedRamAtom)
  const cpuUsage = useAtomValue(cpuUsageAtom)
  const gpus = useAtomValue(gpusAtom)
  const [showFullScreen, setShowFullScreen] = useState(false)
  const ramUtilitized = useAtomValue(ramUtilitizedAtom)
  const [systemMonitorCollapse, setSystemMonitorCollapse] = useAtom(
    systemMonitorCollapseAtom
  )
  const [control, setControl] = useState<HTMLDivElement | null>(null)
  const [elementExpand, setElementExpand] = useState<HTMLDivElement | null>(
    null
  )

  const { watch, stopWatching } = useGetSystemResources()
  useClickOutside(
    () => {
      setSystemMonitorCollapse(false)
      setShowFullScreen(false)
    },
    null,
    [control, elementExpand]
  )

  useEffect(() => {
    // Watch for resource update
    watch()

    return () => {
      stopWatching()
    }
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [])

  const calculateUtilization = () => {
    let sum = 0
    const util = gpus.map((x) => {
      return Number(x['utilization'])
    })
    util.forEach((num) => {
      sum += num
    })
    return sum
  }

  return (
    <Fragment>
      <div
        ref={setControl}
        className={twMerge(
          'flex items-center gap-x-2 cursor-pointer p-2 rounded-md hover:bg-secondary',
          systemMonitorCollapse && 'bg-secondary'
        )}
        onClick={() => {
          setSystemMonitorCollapse(!systemMonitorCollapse)
          setShowFullScreen(false)
        }}
      >
        <MonitorIcon size={16} />
        <span className="text-xs font-medium">System Monitor</span>
      </div>
      {systemMonitorCollapse && (
        <div
          ref={setElementExpand}
          className={twMerge(
            'fixed left-16 bottom-12 bg-white w-[calc(100%-64px)] z-50 border-t border-border flex flex-col flex-shrink-0',
            showFullScreen && 'h-[calc(100%-48px)]'
          )}
        >
          <div className="h-12 flex items-center border-b border-border px-4 justify-between flex-shrink-0">
            <h6 className="font-medium">Running Models</h6>
            <div className="flex items-center gap-x-2 unset-drag">
              {showFullScreen ? (
                <ChevronDown
                  size={20}
                  className="text-muted-foreground cursor-pointer"
                  onClick={() => setShowFullScreen(!showFullScreen)}
                />
              ) : (
                <ChevronUp
                  size={20}
                  className="text-muted-foreground cursor-pointer"
                  onClick={() => setShowFullScreen(!showFullScreen)}
                />
              )}
              <XIcon
                size={16}
                className="text-muted-foreground cursor-pointer"
                onClick={() => {
                  setSystemMonitorCollapse(false)
                  setShowFullScreen(false)
                }}
              />
            </div>
          </div>
          <div className="flex gap-4 h-full">
            <TableActiveModel />
            <div className="border-l border-border p-4 w-full">
              <div className="mb-4 pb-4 border-b border-border">
                <h6 className="font-bold">CPU</h6>
                <div className="flex items-center gap-x-4">
                  <Progress value={cpuUsage} className="h-2" />
                  <span className="flex-shrink-0 text-muted-foreground">
                    {cpuUsage}%
                  </span>
                </div>
              </div>
              <div className="mb-4 pb-4 border-b border-border">
                <div className="flex items-center gap-2">
                  <h6 className="font-bold">Memory</h6>
                  <span className="text-xs text-muted-foreground">
                    {toGibibytes(usedRam)} of {toGibibytes(totalRam)} used
                  </span>
                </div>
                <div className="flex items-center gap-x-4">
                  <Progress
                    value={Math.round((usedRam / totalRam) * 100)}
                    className="h-2"
                  />
                  <span className="flex-shrink-0 text-muted-foreground">
                    {ramUtilitized}%
                  </span>
                </div>
              </div>
              {gpus.length > 0 && (
                <div className="mb-4 pb-4 border-b border-border">
                  <h6 className="font-bold">GPU</h6>
                  <div className="flex items-center gap-x-4">
                    <Progress value={calculateUtilization()} className="h-2" />
                    <span className="flex-shrink-0 text-muted-foreground">
                      {calculateUtilization()}%
                    </span>
                  </div>
                  {gpus.map((gpu, index) => (
                    <div
                      key={index}
                      className="flex items-start justify-between mt-4 gap-4"
                    >
                      <span className="text-muted-foreground font-medium line-clamp-1 w-1/2">
                        {gpu.name}
                      </span>
                      <div className="flex gap-x-2">
                        <span className="font-semibold">
                          {gpu.utilization}%
                        </span>
                        <div>
                          <span className="font-semibold">{gpu.vram}</span>
                          <span>MB VRAM</span>
                        </div>
                      </div>
                    </div>
                  ))}
                </div>
              )}
            </div>
          </div>
        </div>
      )}
    </Fragment>
  )
}

export default SystemMonitor