macOS Applescript for checking changes to Apple Refurbished Store (or any site)

global my_url, my_text, the_filename, the_filepath, the_file, the_new_file, the_old_file, old_fileSize, new_fileSize, my_email_address

on run {}
	check_site()
end run

on idle {}
	tell application "Finder" to update the_filepath
	check_site()
	return 90 --seconds between checking
end idle

on check_site()
	
	--here are the variables you need to change
	set my_url to "http://store.apple.com/ca/browse/home/specialdeals/mac/mac_pro" --this can be any site you want to monitor for changes
	set the_filepath to "Your_HD:Users:your_name:Documents:Website Change:" --path to where your script is located along with the html files
	set my_email_address to "your_name@email.com" --your email address
	
	set my_text to do shell script "curl " & quoted form of my_url
	set the_filename to "current.html" --this file has to already exist at the_filepath
	set the_file to the_filepath & the_filename
	
	try
		set eof file the_file to 0
		write my_text to file the_file
	end try
	tell application "Finder" to update the_filepath
	set the_new_file to alias the_file
	--needed to add this for the updates to work properly on my machine
	repeat
		try
			tell application "Finder" to set new_fileSize to the size of the_new_file
			if new_fileSize is not missing value then exit repeat
		on error
			delay 1
			tell application "Finder" to update the_filepath
			delay 5
		end try
	end repeat
	
	
	set the_filename to "previous.html" --this file needs to exist at the_filepath
	set the_file to the_filepath & the_filename
	set the_old_file to alias the_file
	
	repeat
		try
			tell application "Finder" to set old_fileSize to the size of the_old_file
			if old_fileSize is not missing value then exit repeat
		on error
			delay 1
			tell application "Finder" to update the_filepath
			delay 5
		end try
	end repeat
	
	
	set size_change to new_fileSize - old_fileSize as integer
	if size_change = 0 then
		--display dialog "No change"
		delay 0.1
	else
		if size_change > 150 or size_change < -150 then
			
			tell application "Finder"
				if process "Mail" exists then
					delay 0.5
				else
					tell application "Mail" to launch
					tell application "Finder"
						repeat until process "Mail" exists
							delay 0.5
						end repeat
						delay 0.5
					end tell
				end if
			end tell
			delay 1
			tell application "Finder" to set the visible of process "Mail" to false
			
			tell application "Mail"
				set theMessage to make new outgoing message with properties {visible:false, subject:"Change to Refurbished Mac Store", content:"Change of " & size_change & " bytes" & return & my_url}
				tell theMessage
					make new to recipient at end of to recipients with properties {address:my_email_address}
					make new attachment with properties {file name:the_new_file} at after the last word of the last paragraph
					make new attachment with properties {file name:the_old_file} at after the last word of the last paragraph
				end tell
				delay 5
				send theMessage
				try
					set eof file the_file to 0
					write my_text to file the_file
				end try
			end tell
		end if
	end if
end check_site