#!/usr/bin/env bash
#-*-coding:utf-8 -*-
#Auto updated?
#   Yes
#File:
#   dropdown_btop
#Author:
#   The-Repo-Club [wayne6324@gmail.com]
#Github:
#   https://github.com/The-Repo-Club/
#
#Created:
#   Thu 27 October 2022, 06:11:40 PM [GMT+1]
#Modified:
#   Fri 28 October 2022, 04:08:33 PM [GMT+1]
#
#Description:
#   <Todo>
#
#Dependencies:
#   alacritty
#
# shellcheck disable=all

# Controls a dropdown btop for use in i3wm

DISPLAY_WIDTH=1920
TERMINAL_WIDTH=1200
TERMINAL_HEIGHT=500

TERMINAL=alacritty # Change this to whatever btop emulator you want

# Temporary file to record the btop state
TERMINAL_STATE=/tmp/dropdown_pavucontrol_state

# Adjust the sleep time and step size as necessary to make the animation smooth
STEP_SIZE=50
SLEEP_TIME=0.02

usage() {
    echo "Open/closes a dropdown btop"
    echo "Usage: dropdown_btop <start|open|close|toggle>"
}

term_launch() {
    $TERMINAL --class=dropdown-terminal -e btop &
    local term_pid=$!
    # Wait for btop to open
    xdotool search --sync --pid $term_pid >/dev/null
    i3-msg -q mark dropdown_btop # Mark the btop so we can identify it
    i3-msg -q [con_mark=dropdown_btop] move scratchpad
    echo "closed" >$TERMINAL_STATE
}

term_open() {
    if [ "$(cat $TERMINAL_STATE)" == "closed" ]; then
        echo "animating" >$TERMINAL_STATE
        i3-msg -q [con_mark=dropdown_btop] scratchpad show
        i3-msg -q resize set $TERMINAL_WIDTH $TERMINAL_HEIGHT
        i3-msg -q move absolute position $(((DISPLAY_WIDTH - TERMINAL_WIDTH) / 2)) 30
        i3-msg -q move up $((TERMINAL_HEIGHT - 1))

        for i in $(seq 1 $STEP_SIZE $TERMINAL_HEIGHT); do
            i3-msg -q [con_mark=dropdown_btop] move down $STEP_SIZE
            sleep $SLEEP_TIME
        done
        echo "open" >$TERMINAL_STATE
    fi
}

term_close() {
    if [ "$(cat $TERMINAL_STATE)" == "open" ]; then
        echo "animating" >$TERMINAL_STATE
        i3-msg -q [con_mark=dropdown_btop] focus
        for i in $(seq 1 $STEP_SIZE $TERMINAL_HEIGHT); do
            i3-msg -q [con_mark=dropdown_btop] move up $STEP_SIZE
            sleep $SLEEP_TIME
        done
        i3-msg -q [con_mark=dropdown_btop] scratchpad show
        echo "closed" >$TERMINAL_STATE
    fi
}

term_toggle() {
    cmdList=$(i3-msg -t get_marks)
    me=$(basename "$0")
    if [[ ${cmdList[*]} =~ $me ]]; then
        case "$(cat $TERMINAL_STATE)" in
            open) term_close ;;
            closed) term_open ;;
            *) ;;
        esac
    else
        $me "start"
        $me "toggle"
    fi
}

case $1 in
    start) term_launch ;;
    open) term_open ;;
    close) term_close ;;
    toggle) term_toggle ;;
    *) usage ;;
esac