#!/bin/bash

#spin up a simple webserver so users can connect and download files.
#this relies on python3 being installed.
#17DEC2022 KM4ACK

#Directory for server to display. Typically this is the files directory but
#it is also possible to limit visitors to a specefic sub directory.
#ie $HOME/pi-display/files/sub-directory

DIR=$HOME/pi-display/files
ADDR=$(hostname -I)
IP1=$(echo $ADDR | awk '{print $1}')
IP2=$(echo $ADDR | awk '{print $2}')
TMP=/run/user/$UID/server.tmp
HTML=$HOME/pi-display/files/server-instructions.html
clear;echo;echo
echo "IP address of server is"
echo "${IP1}:7000"
if [ -n "$IP2" ]; then
	echo "or"
	echo "${IP2}:7000"
fi
echo
echo "starting web server"
cd $DIR
/usr/bin/screen -S web-server -d -m python3 -m http.server 7000
echo "Server started with screen. To stop the server, run"
echo "screen -r web-server"
echo "followed with ctrl+c"
echo
read -p "Would you like to add instructions to the display? y/n " ans

if [ "$ans" = 'y' ] || [ "$ans" = 'Y' ]; then
	read -p "What is the WiFi SSID? " SSID
	read -p "What is the WiFi password? " PWD
	echo "Generating html file for display"
	cat > $TMP <<EOF
<center>
<br/>
<span style="color:red;font-weight:700;font-size:100px"> Web Server Instructions</span>
<br/>
<span style="color:black;font-weight:700;font-size:60px"> Use WiFi on your device and connect to</span>
<br/>
<span style="color:black;font-weight:700;font-size:60px"> SSID = $SSID</span>
<br/>
<span style="color:black;font-weight:700;font-size:60px"> Password = $PWD</span>
<br/>
<span style="color:black;font-weight:700;font-size:60px"> Then open the browser and navigate to</span>
<br/>
<span style="color:black;font-weight:700;font-size:60px"> ${IP1}:7000 </span>
EOF

if [ -n ${IP2} ]; then
	echo"<br/>" >> $TMP
	echo "<span style=\"color:black;font-weight:700;font-size:60px\"> or ${IP2}:7000 </span>" >> $TMP
	echo "</center>" >> $TMP
else
	echo "</center>" >> $TMP
fi

	cat $TMP | pandoc -s -o $HTML >/dev/null 2>&1
	read -p "How many seconds should the page be displayed? " sec
	#remove file from links if exist
	if grep server-instructions $HOME/pi-display/links; then
			sed -i "/server-instructions/d" $HOME/pi-display/links
	fi
	echo "server-instructions.html,${sec}" >> $HOME/pi-display/links
	echo "The page will now display for $sec seconds"
	echo "This can be changed in $HOME/pi-display/links"

else
	exit 0
fi