#!/bin/bash

if [ "$scriptsdev" != "" -a "$scriptsdev" != "dev" ]; then 
    echo ERROR:
    echo The \$scriptsdev variable is set to an invalid value.
    echo \(The variable should not be set.\)
    echo Please contact scripts@mit.edu.
fi

sshrun() {
    athrun scripts sshmic "$lname@scripts.mit.edu" "/mit/scripts/$@" 2>/dev/null
}

checksqlpass() {
    errors=`sshrun "sql/bin$scriptsdev/test-password"`
    if [ "$errors" != "" ]; then
        if [ "$1" -eq 1 ]; then
          rm -f "$lroot/.sql/my.cnf"
        fi
        echo
        echo ERROR:
        printf "$2"
        printf "$3"
        exit 1
    fi
}
attach scripts sql 2>/dev/null

echo Welcome to the scripts.mit.edu uninstaller. This program will
echo help you cleanly remove software that you have auto-installed.
echo
echo Are you removing an installation from:
echo 1. Your personal Athena account
echo 2. A locker that you control \(a club, a course, etc.\)
echo If you do not understand this question, you should answer 1.
printf "Please enter either 1 or 2: "
read whofor
if [ "$whofor" -eq 1 ]; then
    lname=$USER
    lroot=$HOME
elif [ "$whofor" -eq 2 ]; then
    echo
    echo Please enter the name of the selected locker below.
    echo "(For the locker /mit/sipb, you would enter sipb.)"
    read lname
    lroot="/mit/$lname"
else
    echo
    echo ERROR:
    echo You must select either 1 or 2.
    exit 1
fi
attach "$lname" 2>/dev/null

echo 
echo When you installed the software, you chose a URL
echo that starts with http://scripts.mit.edu/~"$lname"/.
echo Please enter the full URL where this software was
echo installed. \(This should correspond to a directory
echo in /mit/"$lname"/web_scripts/.\)
printf "URL: http://scripts.mit.edu/~$lname/"
read addrend

addrend=`echo "$addrend" | sed -n 's/^\([a-z0-9A-Z\/-]*[a-z0-9A-Z-]\)\/\?$/\1/ p'`
if [ "$addrend" = "" ]; then
    echo
    echo ERROR:
    echo You must enter one or more characters after "~$lname/"
    echo The completed address must only contain a-z, 0-9, and /.
    exit 1
fi

if [ ! -d "$lroot/web_scripts/$addrend" ]; then
    echo
    echo ERROR:
    echo The directory "$lroot/web_scripts/$addrend"
    echo does not exist. Please make sure that this is the
    echo correct installation directory, and try again, or
    echo contact scripts@mit.edu for assistance.
    exit 1
fi

echo

sqlinfo=`sshrun "sql/bin$scriptsdev/get-password"`
if [ "$sqlinfo" = "" ]; then
    echo 
    echo You have a MySQL account but you do not have a .my.cnf file.
    echo If you do not remember your MySQL account password, you can change it
    echo at http://sql.mit.edu using MIT certificates. 
    printf "Please type your MySQL password and press [enter]: "
    stty -echo
    read sqlpass
    stty echo
    echo
    sqlhost="sql.mit.edu"
    sqluser=$lname
    . "/mit/scripts/sql/bin$scriptsdev/save-password"
    checksqlpass 1 'The MySQL password that you typed appears to be incorrect.\n' ''
    echo
    echo OK.  Continuing with the uninstaller...
else
    checksqlpass 0 'The MySQL login information in your .my.cnf file\n' 'appears to be incorrect.\n'
fi

sqldb=`sshrun "sql/bin$scriptsdev/get-next-database" "$addrend"`
if [ "$sqldb" != "${addrend}1" -a "$sqldb" != "$addrend" ]; then
    echo
    echo ERROR:
    echo The auto-uninstaller was unable to find the appropriate
    echo database to drop. Please examine the installation to
    echo find the database it uses, drop the database from
    echo http://sql.mit.edu/, and manually remove the "$addrend"
    echo directory \(or re-run the auto-installer\). Contact
    echo scripts@mit.edu if you need assistance.
    exit 1
fi

echo Removing files. Please wait...
echo \(This may take several seconds for large software.\)
if rm -rf "$lroot/web_scripts/$addrend"; then
    echo The directory "$lroot/web_scripts/$addrend"
    echo was successfully removed.
    if [ -d "$lroot/OldFiles/web_scripts/$addrend" ]; then
        echo A one-day-old backup of the installation is
        echo available from "$lroot/OldFiles/web_scripts/$addrend".
    fi
else
    echo ERROR:
    echo The directory "$lroot/web_scripts/$addrend"
    echo could not be removed. Please ensure that you have
    echo access to this directory and try again, or
    echo contact scripts@mit.edu for assistance.
    exit 1
fi

echo 
if [ "$sqldb" = "${addrend}1" ]; then
    sqldb="$lname+$addrend"
    dropped=`sshrun sql/bin$scriptsdev/drop-database "$sqldb"`
    if [ "$dropped" ]; then
        echo The database "$sqldb"
        echo was successfully removed.
        attach sql 2>/dev/null
	if [ -f "/mit/sql/backup/$lname/$sqldb.sql.gz" ]; then
            echo A one-day-old backup of your SQL database is
            echo available in /mit/sql/backup/"$lname".
        fi
        exit
    else
        echo ERROR:
        echo The database "$lname+$addrend"
        echo could not be automatically removed. You can
        echo try removing it from http://sql.mit.edu/,
        echo or you can contact sql@mit.edu for assistance.
        exit 1
    fi
fi
echo
echo The installation in "scripts.mit.edu/~$lname/$addrend"
echo has been successfully uninstalled.