import std/os
import strutils
import std/osproc
import std/math
import i3bar_base

proc getLimit(): int

let limit = getLimit()
let args = getArguments()

proc getLimit(): int =
  let limit = parseInt(strip(readFile("/sys/class/backlight/intel_backlight/max_brightness")))
  return limit

proc getDesign(pcnt: float): string =
  var icon = "🌑"
  case pcnt:
    of 85..100:
      icon = "🌕"
    of 75..85:
      icon = "🌖"
    of 50..75:
      icon = "🌗"
    of 35..50:
      icon = "🌘"
    else:
      icon = "🌑"
  let percent = toInt(round(pcnt,0))
  let text = icon & " " & $percent & "%"
  return text



proc getBrightness() =
  let current = parseInt(strip(readFile("/sys/class/backlight/intel_backlight/actual_brightness")))
  let pcnt = (current/limit)*100
  let text = getDesign(pcnt)
  let data = i3barData(
    full_text: text,
    color: foreground,
    border: yellow
  )
  outputJSON(data)

proc main() =
  if len(args) > 0:
    if args[0] == "4":
      discard execCmd("xbacklight -inc 5")
    elif args[0] == "5":
      discard execCmd("xbacklight -dec 5")
  getBrightness()

main()