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#!/bin/bash

LANG=en_US

# A pure bash system information script for laptops, desktops, servers and everything
# else capable of running Linux with bash.

# This function prints X dashes, followed by the provided argument, followed by another
# X dashes.
#
# X is calculated by dividing the number of cols in two (tput cols / 2) and subtracting
# 1 for extra padding between the dashes and the title.
title() {
	titlelength="${#1}"
	((titlelength=titlelength+2))
	maxcols="$(echo "($(tput cols) - ${titlelength}) / 2" | bc)"

	printf "\n"

	# Build the left side dashes
	for i in $(seq 1 ${maxcols}); do
		printf "-"
	done

	printf " %s " "${1}"

	# Build the right side dashes
	for i in $(seq 1 ${maxcols}); do
		printf "-"
	done

	printf "\n\n"
}

# This function is a wrapper around printf with some specific formatting options.
aprintf() {
	# If this is a terminal do a nice coloured/bold output, otherwise don't.
	if [ -t 1 ]; then
		printf "%-54s: %s\n" "${1}" "$(tput bold)${2}$(tput sgr0)"
	else
		printf "%-54s: %s\n" "${1}" "${2}"
	fi
}

# This function is a wrapper around printf() with some specific formatting and length options.
keyvalue() {
	cols="$(echo "($(tput cols) - 2) / 2" | bc)"

	if [ -t 1 ]; then
		printf "%-${cols}s : %s\n" "${1}" "$(tput bold)${2}$(tput sgr0)"
	else
		printf "%-${cols}s : %s\n" "${1}" "${2}"
	fi
}

# This function checks the load average (in /proc/loadavg) and applies colour to
# the output.
format_load_average() {
	db="/proc/loadavg"
	max="$(nproc)"

	f1="$(awk '{print $1}' "${db}")"
	f5="$(awk '{print $2}' "${db}")"
	f15="$(awk '{print $3}' "${db}")"

	_buildlabel() {
		# If this is a terminal do nice colour things, if not just echo the input.
		if [ -t 1 ]; then
			if [ "$(echo "${1} <= ${max}" | bc)" -eq 0 ]; then
				echo "$(tput setaf 1)$(tput bold)${1}$(tput sgr0)"
			else
				echo "$(tput setaf 2)$(tput bold)${1}$(tput sgr0)"
			fi
		else
			echo "${1}"
		fi
	}

	# Generate labels
	label1="$(_buildlabel "${f1}")"
	label5="$(_buildlabel "${f5}")"
	label15="$(_buildlabel "${f15}")"

	printf "%s, %s, %s" "${label1}" "${label5}" "${label15}"
}

# This function checks if ${2} has ${1}
has() {
	if [ $(grep -c "${1}" "${2}") ]; then
		echo "Yes"
	else
		echo "No"
	fi
}

if [[ $(tput cols) -lt 132 ]]; then
	echo " "
	echo "${0} can only run if the number of cols in this shell is 132 or more. Number of cols here is $(tput cols) Exiting."
	echo " "

	exit 1
fi

# This section is basic information and an introduction to this script.
# It prints a mesasge that it will produce more info when called with sudo.
title "Information script"

if (( $(id -u) > 0 )); then
	echo -e "Information:\tthis script shows more information when called with sudo, like so: "
	echo -e "\t\tsudo $(basename ${SHELL}) ${0}"
	echo " "
fi

# The sections this script has get named here.
echo "This script has the following section(s):"
OLDIFS=${IFS}
IFS=$'\n'
for section in $(grep '^title ' ${0} | tail -n +2); do
	printf " - %s\n" "$(echo "${section}" | awk -F\" '{print $2}')"
done
IFS=${OLDIFS}

echo " "

aprintf "Shell used for ${0}" "$(echo ${SHELL})"

# This section is information related to the host OS / computer.
# The following information is printed:
# - Hostname
# - Domainname (if applicable)
# - OS
# - Hardware vendor
# - Hardware model
title "Host information"
aprintf "Hostname" $(hostname -s)

if [[ "$(hostname -d | wc -l)" ]]; then
	aprintf "Domainname" $(hostname -d)
fi

aprintf "OS" $(hostnamectl | grep "Operating System" | cut -d: -f2 | xargs)
aprintf "Hardware vendor" $(hostnamectl | grep "Hardware Vendor" | cut -d: -f2 | xargs)
aprintf "Hardware model" $(hostnamectl | grep "Hardware Model" | cut -d: -f2 | xargs)

# This section shows statistics related to the host:
# - Uptime
# - User(s) logged in
# - Most CPU used by (PID)
# - Most RAM used by (PID)
# - Load average
# - Max load
title "Host statistics"
aprintf "Uptime" "$(uptime -p | cut -d " " -f2-)"
aprintf "User(s) logged in" $(who -u | wc -l)
aprintf "Most CPU used by" "$(ps --no-headers -eo cmd,pid --sort=-%cpu | head -n1 | xargs)"
aprintf "Most RAM used by" "$(ps --no-headers -eo cmd,pid --sort=-%mem | head -n1 | xargs)"
aprintf "Load average" "$(format_load_average)"
aprintf "Max load" "$(nproc)"

# This section shows network information:
# - Number of NICs in the system
# - Information about each NIC
# - - Name
# - - Status
# - - MAC address
# - Default route
title "Network information"
aprintf "Number of NICs" "$(ip -br link | tail -n +2 | wc -l)"

for nic in $(ip -br link | tail -n +2 | awk '{print $1}'); do
	nicname="$(ip -br link show "${nic}" | awk '{print $1}')"
	nicstatus="$(ip -br link show "${nic}" | awk '{print $2}')"
	nicmac="$(ip -br link show "${nic}" | awk '{print $3}')"

	if [ "${nicstatus}" = "UP" ]; then
		ipaddr="$(ip -br addr show "${nic}" | awk '{print $3}' | xargs)"
		if [ -t 1 ]; then
			printf " - %s \t %s \t %s \t %s\n" "${nicname}" "$(tput setaf 2)UP$(tput sgr0)" "${nicmac}" "${ipaddr}"
		else
			printf " - %s \t %s \t %s \t %s\n" "${nicname}" "UP" "${nicmac}" "${ipaddr}"
		fi
	else
		if [ -t 1 ]; then
			printf " - %s \t %s \t %s\n"  "${nicname}" "$(tput setaf 1)DOWN$(tput sgr0)" "${nicmac}"
		else
			printf " - %s \t %s \t %s\n"  "${nicname}" "DOWN" "${nicmac}"
		fi
	fi
done

aprintf "Default route" "$(ip -br route list default | awk '{print $3}')"

# This section shows firewall information, *if* the firewalld service is running
if [[ "$(systemctl --quiet is-active firewalld.service)" -eq 0 ]]; then
	title "Firewall information"
	aprintf "Firewalld zone" "$(firewall-cmd --list-all | head -n1)"

	OLDIFS=${IFS}
	IFS=$'\n'
	for line in $(firewall-cmd --list-all | tail -n +2); do
		key="$(echo ${line} | cut -d: -f1 | xargs)"
		value="$(echo ${line} | cut -d: -f2 | xargs)"
		aprintf "${key}" "${value}"
	done

	IFS=${OLDIFS}
fi

# This section shows memory (RAM/swap) information:
# - Total memory installed
# - Total memory used
# - Memory (RAM) type*
# - Total swap size
# - Total swap used
title "RAM/Swap information"

totalmemory="$(free -g --si | awk '/^Mem/ {print $2}')"
memoryused="$(free -g --si | awk '/^Mem/ {print $3}')"
totalswap="$(free -g --si | awk '/^Swap/ {print $2}')"
swapused="$(free -g --si | awk '/^Swap/ {print $3}')"

aprintf "Total memory installed" "${totalmemory}GB"

if [ -t 1 ]; then
	if (( "${memoryused}" < "${totalmemory}" )); then
		aprintf "Memory used" "$(tput setaf 2)${memoryused}GB$(tput sgr0)"
	else
		aprintf "Memory used" "$(tput setaf 1)${memoryused}GB$(tput sgr0)"
	fi
else
	aprintf "Memory used" "${memoryused}GB"
fi

if (( $(id -u) == 0 )); then
	aprintf "Memory type" "$(dmidecode -t 17 | grep Type: | uniq | cut -d: -f2 | xargs)"
fi

aprintf "Total swap" "${totalswap}GB"

if [ -t 1 ]; then
	if (( "${swapused}" < "${totalswap}" )); then
		aprintf "Swap used" "$(tput setaf 2)${swapused}GB$(tput sgr0)"
	else
		aprintf "Swap used" "$(tput setaf 1)${swapused}GB$(tput sgr0)"
	fi
else
	aprintf "Swap used" "${swapused}GB"
fi

# This section shows CPU information:
# - CPU model name
# - CPU vendor ID
# - CPU bugs*
# - Number of cores
title "CPU information"
aprintf "CPU model name" "$(grep "model name" /proc/cpuinfo | cut -d: -f2 | uniq | cut -d@ -f1 | xargs)"
aprintf "CPU vendor id" "$(grep vendor_id /proc/cpuinfo | cut -d: -f2 | uniq | xargs)"

if (( $(id -u) == 0 )); then
	aprintf "CPU bugs" "$(grep bugs /proc/cpuinfo | cut -d: -f2 | uniq | xargs)"
fi

aprintf "Number of cores" $(nproc)

# This section contains information about the GPU:
# - GPU manufacturer and type
# - Number of GPU(s)
title "GPU information"
aprintf "GPU manufacturer and type" "$(lspci | grep -i vga | awk -F: '{print $3}' | uniq | xargs)"
aprintf "Number of GPUs" "$(lspci | grep -i vga | wc -l)"

# This section contains information about installed system software (packages):
# - Total number of RPM packages installed
# - - List of packages**
# - Total number of repositories installed
# - - List of total repositories installed**
# - Total number of repositories activated
# - - List of total repositories activated**
# - Total number of flatpak upser applications
# - - List of total flatpak user applications**
# - Total number of flatpak user runtimes
# - - List of total flatpak user runtimes**
# - Total number of flatpak system applications
# - - List of total flatpak system applications**
# - Total number of flatpak system runtimes
# - - List of total flatpak system runtimes**
# - Total number of flatpak remotes
# - - List of flatpak remotes**
title "Package information"
aprintf "Total number of packages installed (RPM)" "$(rpm -qa | wc -l)"

if [ "${1}" = "-v" ]; then
	for pkg in $(rpm -qa | sort); do
		printf " - %s\n" "${pkg}"
	done
fi

aprintf "Total number of repositories installed" "$(dnf repolist --all | wc -l)"

if [ "${1}" = "-v" ]; then
	for repo in $(dnf repolist --all | tail -n +2 | awk '{print $1}' | sort); do
		printf " - %s\n" "${repo}"
	done
fi

aprintf "Total number of repositories activated" "$(dnf repolist | wc -l)"

if [ "${1}" = "-v" ]; then
	for repo in $(dnf repolist | tail -n +2 | awk '{print $1}' | sort); do
		printf " - %s\n" "${repo}"
	done
fi

if [[ ! -z "$(rpm -qa flatpak)" ]]; then
	aprintf "Total number of flatpak user applications installed" "$(flatpak list --app --user | wc -l)"

	if [ "${1}" = "-v" ] && [ ! -z "$(flatpak list --app --user)" ]; then
		for flatpakapp in $(flatpak list --app --user | awk '{print $1}' | sort); do
			printf " - %s\n" "${flatpakapp}"
		done
	fi

	aprintf "Total number of flatpak user runtimes installed" "$(flatpak list --runtime --user | wc -l)"

	if [ "${1}" = "-v" ] && [ ! -z "$(flatpak list --runtime --user)" ]; then
		for flatpakruntime in $(flatpak list --runtime --user | awk '{print $1}' | sort); do
			printf " - %s\n" "${flatpakruntime}"
		done
	fi

	aprintf "Total number of flatpak system applications installed" "$(flatpak list --app | wc -l)"

	if [ "${1}" = "-v" ] && [ ! -z "$(flatpak list --app)" ]; then
		for flatpakapp in $(flatpak list --app | awk '{print $1}' | sort); do
			printf " - %s\n" "${flatpakapp}"
		done
	fi

	aprintf "Total number of flatpak system runtimes installed" "$(flatpak list --runtime | wc -l)"

	if [ "${1}" = "-v" ] && [ ! -z "$(flatpak list --runtime)" ]; then
		for flatpakruntime in $(flatpak list --runtime | awk '{print $1}' | sort); do
			printf " - %s\n" "${flatpakruntime}"
		done
	fi

	aprintf "Total number of flatpak remotes installed" "$(flatpak remote-list | tail -n +1 | wc -l)"

	if [ "${1}" = "-v" ] && [ ! -z "$(flatpak remote-list | tail -n +1)" ]; then
		for flatpakremote in $(flatpak remote-list | tail -n +1 | awk '{print $1}' | sort); do
			printf " - %s\n" "${flatpakremote}"
		done
	fi
fi

# This section contains user information:
# - Username
# - User ID
# - Is the user local?
# - Member of group(s)*
# - Home directory
title "User information"
aprintf "Username" "$(whoami)"
aprintf "User ID" "$(id -u)"
aprintf "Local user" "$(has "^$(whoami)" /etc/passwd)"
aprintf "User shell" "$(getent passwd $(whoami) | awk -F: '{print $7}')"

if [ "${1}" = "-v" ]; then
	printf "Member of group(s):\n"

	for groupname in $(groups | tr ' ' '\n' | sort); do
		if [ -t 1 ]; then
			if [ "${groupname}" = "admins" ] || [ "${groupname}" = "sudo" ] || [ "${groupname}" = "wheel" ]; then
				printf " - %s (#%s)\n" "$(tput setaf 1)${groupname}$(tput sgr0)" "$(getent group ${groupname} | cut -d: -f3)"
			elif [ "${groupname}" = "$(whoami)" ]; then
				printf " - %s (#%s)\n" "$(tput setaf 6)${groupname}$(tput sgr0)" "$(getent group ${groupname} | cut -d: -f3)"
			else
				printf " - %s (#%s)\n" "${groupname}" "$(getent group ${groupname} | cut -d: -f3)"
			fi
		else
			printf " - %s (#%s)\n" "${groupname}" "$(getent group ${groupname} | cut -d: -f3)"
		fi
	done
else
	aprintf "Member of group(s)" "$(groups)"
fi

aprintf "Home directory" "${HOME}"

exit 0