#
# Functions which reside in config.fish and tap into fish shell system hooks
# To enable automatic alert, run `set -U _long_command_finished_notification true`
#

function exec_start --on-event fish_preexec -d "Starts the execution clock of a process"
  set -g _exec_start (date +%s)
end

function exec_end --on-event fish_postexec -d "Stop the execution clock of a process and set _exec_delta"
  set -g _exec_delta (math (date +%s) - $_exec_start)
  set -e -g _exec_start
  set -g _formatted_time (decode_time $_exec_delta)
end

function auto_alert --on-event fish_postexec -d "Check the execution delta and send an alert on long running commands"
  if test "$_long_command_finished_notification" != true
    return
  end

  if test $_exec_delta -gt 12
    set -l first_word (string split -m 1 " " "$argv[1]")[1]
    alert -m "$first_word command finished ($_formatted_time)"
  end
end

#
# Fish functions which reside in .config/fish/functions and are used as part of
# the functions triggered by fish events.
#

# ~/.config/fish/functions/alert.fish
function alert -d "Send a request to hammerspoon for a system notification"
  argparse --name alert 'm/message=' 't/timeout=' -- $argv or return
  open -g "hammerspoon://task_completed?message=$_flag_message&timeout=$_flag_timeout"
end

# ~/.config/fish/functions/decode_time.fish
function decode_time -d "Converts a unix timestamp delta into d:hh:mm:ss"
  # ported from / inspired by https://github.com/thcipriani/dotfiles/blob/3c2d75bc31865d97b36723351f9a8e1722a17d1b/bash_prompt#L97
  set -l seconds $argv[1]
  set -l days (math $seconds / 86400)
  set -l hours (math "$seconds / 3600 % 24")
  set -l minutes (math "$seconds / 60 % 60")
  set -l seconds (math "$seconds % 60")

  set -l sent_days 0
  set -l sent_hours 0
  set -l sent_minutes 0
  set -l printable ''


  if test $days -gt 0
    set printable $printable{$days}d
    set sent_days 1
  end

  if test $hours -gt 0 -o $sent_days -gt 0
    test $sent_days -gt 0; and set printable $printable{' '}
    set printable $printable{$hours}h
    set sent_hours 1
  end

  if test $minutes -gt 0 -o $sent_hours -gt 0
    test $sent_hours -gt 0; and set printable $printable{' '}
    set printable $printable{$minutes}m
    set sent_minutes 1
  end

  test $sent_minutes -gt 0; and set printable $printable{' '}
  echo $printable{$seconds}s
end

-- ~/.hammerspoon/init.lua
hs.urlevent.bind("task_completed", function(eventName, params)
  local message = params['message']
  local timeout = tonumber(params['timeout'])

  if not message or message:len() == 0 then
    message = "Long running command completed"
  end

  if not timeout then
    timeout = 11
  end

  local notification = hs.notify.new(function() end,
    {
      autoWithdraw = true,
      title = "Terminal Notification",
      informativeText = message,
      hasActionButton = false
    }
  )
  notification:send()

  if timeout > 0 then
    hs.timer.doAfter(timeout, function()
      notification:withdraw()
    end)
  end
end)