#!/bin/bash
# usage
#     bash watch.sh /path/t/dir processname logfile
set -e

if [ -z $1 ]; then
    dir='.'
else
    dir=$1
fi

if [ -z $2 ]; then
    process_name='none'
else
    process_name=$2
fi

if [ ! -f $3 ]; then
    log_name=/dev/null
else
    log_name=$3
fi

# uptime
uptime_dirty=$(uptime | awk '{print $3,$4}')
uptime_cleaned=${uptime_dirty:0:-1}

# date and time (default date command)
# ex. Sat May 17 11:36:04 PM MDT 2025
date_time=$(date)

echo -e "Uptime: $uptime_cleaned\t\tTime: $date_time\n"

# list filenames ordered by size large to small
list_files=$(ls -lAhS $dir | awk '{print $9}')
eval "list_files_names=($list_files)"
# echo -e "\nda names\n${list_files_names[1]}\n\n"

# size (human) ordered by size large to small
list_human=$(ls -lAhS $dir | awk '{print $5}')
eval "list_files_human=($list_human)"
# echo -e "\nda humans\n${list_files_human[1]}\n\n"

# size (bytes) ordered by size large to small
list_bytes=$(du -d 1 $dir/* | awk '{print $1}' | sort -r -n)
eval "list_files_bytes=($list_bytes)"
# echo -e "\nda bytes\n${list_files_bytes[1]}\n\n"

echo -e "Size (h)\tBytes\tName"

count=0
for name in ${list_files_names[@]}; do
	echo -e "${list_files_human[$count]}\t\t${list_files_bytes[$count]} \t$name"
    count=$(($count + 1))
done

# pid
list_processes_pid=$(ps aux | grep $process_name | awk '{print $2}')
eval "list_processes_pid=($list_processes_pid)"
# echo -e "\nda pids\n${list_processes_pid[1]}\n\n"

# %CPU usage
list_processes_cpu=$(ps aux | grep $process_name | awk '{print $3}')
eval "list_processes_cpu=($list_processes_cpu)"
# echo -e "\nda cpu%\n${list_processes_cpu[1]}\n\n"

# %MEMORY usage
list_processes_mem=$(ps aux | grep $process_name | awk '{print $4}')
eval "list_processes_mem=($list_processes_mem)"
# echo -e "\nda mem%\n${list_processes_mem[1]}\n\n"

# process names
list_processes_name=$(ps aux | grep $process_name | awk '{print $12,$13,$14,$15,$16,$17,$18}' | sed 's/\s/_/g')
eval "list_processes_name=($list_processes_name)"
# echo -e "\nda name\n${list_processes_name[1]}\n\n"

echo -e "\nPID\t\t%MEM\t%CPU\tNAME"
count=0
for name in ${list_processes_name[@]}; do
	echo -e "${list_processes_pid[$count]}\t\t${list_processes_mem[$count]}%\t${list_processes_cpu[$count]}%\t$name"
    count=$(($count + 1))
done

echo -e "\n$log_name"
tail -10 $log_name