#!/bin/bash

installerFileName=$(ls /Applications/ | grep "Install macOS")
cpuNameIntel=$(system_profiler SPHardwareDataType 2>/dev/null | awk -F ": " '/Processor Name/ {print $NF}')
cpuNameApple=$(system_profiler SPHardwareDataType 2>/dev/null | awk -F ": " '/Chip/ {print $NF}')
macOSVersion=$(sw_vers -productVersion)
macOSMajor=$(sw_vers -productVersion | cut -d '.' -f1)
macOSMinor=$(sw_vers -productVersion | cut -d '.' -f2)
macOSName=$(awk '/SOFTWARE LICENSE AGREEMENT FOR macOS/' '/System/Library/CoreServices/Setup Assistant.app/Contents/Resources/en.lproj/OSXSoftwareLicense.rtf' | awk -F 'macOS ' '{print $NF}' | awk '{print substr($0, 0, length($0)-1)}')

password=$1
currentUser=$2

if [ -z $currentUser ]; then 
	currentUser=$(scutil <<< "show State:/Users/ConsoleUser" | awk '/Name :/ && ! /loginwindow/ { print $3 }')
fi

if [ $macOSMajor -eq 10 ] && [ $macOSMinor -lt 15 ]; then
	echo "This script supports only 10.15 or higher"
	exit 0
fi

if [[ $installerFileName == "" ]] ; then

	if [ $macOSMajor -eq 10 ] && [ $macOSMinor -eq 15 ]; then
		softwareupdate --fetch-full-installer --full-installer-version "10.15.7"
	fi
	installerFileName=$(ls /Applications/ | grep "Install macOS")

	if [ "$installerFileName" == "" ] && [ $macOSMajor -eq 10 ] ; then
		echo "Catalina is no longer supported"
	fi

	if [ $macOSMajor -gt 10 ] ; then
		macOSVersion=$(softwareupdate --list-full-installers | grep "$macOSName" |  head -n 1 | awk -F'Version:' '{print $2}' |  awk '{print $1;}' | tr -d ,)
		softwareupdate --fetch-full-installer --full-installer-version $macOSVersion
		installerFileName=$(ls /Applications/ | grep "Install macOS")
	fi

fi

if [ -z "$cpuNameApple" ] && [ $macOSMajor -eq 10 ]; then

	if [ -z "$currentUser" ]; then
		echo "Current user cannot be found. Exiting program."
		exit 1
	fi

"/Applications/$installerFileName/Contents/Resources/startosinstall" --eraseinstall --agreetolicense --nointeraction

elif [ -n "$cpuNameApple" ] || [ $macOSMajor -gt 10 ]; then

	

	if [ -z "$password" ]; then
		echo "This MacOS device has a Apple Processor or is on Big Sur or newer. Please rerun shell script with a admin password appended"
		echo "Usage: sh simpleEraseInstall.sh {admin_password} {admin_user}\n"
		echo "Note: You can omit {admin_user} flag if expected admin is logged in. \n"
		exit 1
	fi

	if [ -z "$currentUser" ]; then
		echo "This MacOS device has a Apple Processor or is on Big Sur or newer. Please rerun shell script with a admin password appended."
		echo "Usage: sh simpleEraseInstall.sh {admin_password} {admin_user}\n"
		echo "Note: You can omit {admin_user} flag if expected admin is logged in. \n"
		exit 1
	fi
		  	/usr/bin/expect <<EOF
set timeout -1
set password ${password}
spawn {/Applications/$installerFileName/Contents/Resources/startosinstall} --eraseinstall --allowremoval --agreetolicense --nointeraction --forcequitapps --passprompt --user {$currentUser}
expect "By using the agreetolicense option, you are agreeing that you have run this tool with the license only option and have read and agreed to the terms.\r\nIf you do not agree, press CTRL-C and cancel this process immediately.\r\nPassword: "
send "$password\r"
expect
EOF

else
  echo "Could not verify if device is a Apple Product"
fi
#set timeout 3600