#!/bin/sh

refresh_token_file()
{
        echo ./D_oauth2_refresh_token_"$1".txt
}

access_token_file()
{
        echo ./D_oauth2_access_token_"$1".txt
}

oauthdirect_file()
{
        echo ./D_oauth2_oauthdirect_"$1".txt
}



#echo 
#echo "get_refresh_token youremail@gmail.com # First time, then once in a while when the refresh_token is no longer working"
get_refresh_token()
{
        refresh_token_file="`refresh_token_file $1`"
        access_token_file="`access_token_file $1`"
        # 1 Get an access_token and a refresh_token
        
        ${my_dirname}/oauth2_google.py --user="$1" \
                --client_id="108687549524-86sjq07f3ch8otl9fnr56mjnniltdrvn.apps.googleusercontent.com" \
                --client_secret=zAJO4PLxzeJ4yOaiJRk6f69k \
                --generate_oauth2_token --quiet
                
        cat typescript | grep -i 'Refresh Token:' | tail -1 | sed -e 's/Refresh Token: *//' | tr -d '\r' | tee "$refresh_token_file"
        cat typescript | grep -i 'Access Token:'  | tail -1 | sed -e 's/Access Token: *//'  | tr -d '\r' | tee "$access_token_file"
        echo refresh_token saved in "$refresh_token_file"
        echo access_token  saved in "$access_token_file"
}

#echo 
#echo "regenerate_access_token youremail@gmail.com # 2 Regenerate an access_token if time passes too long (3600s)"
regenerate_access_token()
{
        refresh_token_file="`refresh_token_file $1`"
        access_token_file="`access_token_file $1`"
        # 2 Regenerate an access_token if time passes too long (3600s)
        refresh_token="`cat $refresh_token_file|tr -d '\r'`"
        echo ${my_dirname}/oauth2_google.py  --quiet --user="$1" \
                --client_id="108687549524-86sjq07f3ch8otl9fnr56mjnniltdrvn.apps.googleusercontent.com" \
                --client_secret=zAJO4PLxzeJ4yOaiJRk6f69k \
                --refresh_token="$refresh_token"
            
        ${my_dirname}/oauth2_google.py  --quiet --user="$1" \
                --client_id="108687549524-86sjq07f3ch8otl9fnr56mjnniltdrvn.apps.googleusercontent.com" \
                --client_secret=zAJO4PLxzeJ4yOaiJRk6f69k \
                --refresh_token="$refresh_token" | tee "$access_token_file"
                
        echo access_token saved in "$access_token_file"
}



refresh_token_is_here()
{
        echo In refresh_token_is_here "$@"
        # force mode
        if test -n "$2"; then
                return $2
        fi
        
        refresh_token_file="`refresh_token_file $1`"
        if test -f "$refresh_token_file" && test -s "$refresh_token_file" ; then
                echo $refresh_token_file is here
                return 0
        else
                echo $refresh_token_file is not here or empty
                return 1
        fi
}


#echo
#echo 'generate_oauthdirect youremail@gmail.com'
generate_oauthdirect()
{
        access_token_file="`access_token_file $1`"
        access_token="`cat $access_token_file`"
        oauthdirect_file="`oauthdirect_file $1`"
        # 3 Generate oauth2_string for imap authentication
        ${my_dirname}/oauth2_google.py --generate_oauth2_string --user="$1" \
                --access_token="$access_token" | tail -1 | tee "$oauthdirect_file"
        echo oauth2_string saved in "$oauthdirect_file"
        echo Give this to imapsync --oauthdirect1 or --oauthdirect2
}


#echo 
#echo authenticate_imap youremail@gmail.com
authenticate_imap() 
{
        # 4
        access_token_file="`access_token_file $1`"
        access_token="`cat $access_token_file`"
        echo $access_token
        ${my_dirname}/oauth2_imap_from_token "$1" "$access_token"
}


#echo 'authenticate_imap_google_from_access_token youremail@gmail.com'
authenticate_imap_google_from_access_token()
{
        # 5
        access_token_file="`access_token_file $1`"
        access_token="`cat $access_token_file`"
        echo "$access_token"
        ${my_dirname}/oauth2_google.py --user="$1" \
                --access_token="$access_token" --test_imap_authentication
}

#echo generate_for_imapsync_tests
generate_for_imapsync_tests()
{
	regenerate_access_token imapsync.gl0@gmail.com \
        && generate_oauthdirect imapsync.gl0@gmail.com \
        && authenticate_imap_google_from_access_token imapsync.gl0@gmail.com \
        && authenticate_imap imapsync.gl0@gmail.com
}

verify_email()
{
        test X"" != X"$1"
}

usage()
{
        verify_email "$1" || { 
                echo "Please, give an email address as parameter"
                return 1
        }
}


get_refresh_token_by_script_fork()
{
        if test -f $0.lock; then
                echo I am a child in script $$ 
                get_refresh_token "$1" 
        else
                echo I am the parent
                touch $0.lock
                echo will do: script -q -f -c "$0 $1 $2" 
                script -q -f -c "$0 $1 $2" 
                rm $0.lock
                regenerate_access_token "$1"
                generate_oauthdirect "$1"
        fi
}

I_am_interractive_or_exit()
{
        if test -t 0; then
                echo Interractive 
                return 0
        else
                echo Not interractive 
                exit 1
        fi
}

#echo "generate_token    youremail@gmail.com"
generate_token()
{
        echo I am PID $$ $0 "$@"
        #
        usage "$1" || return 1
        
        if refresh_token_is_here "$1" "$2" ; then
                regenerate_access_token "$1"
                generate_oauthdirect "$1"
                authenticate_imap_google_from_access_token "$1"
                authenticate_imap "$1"
        else
                I_am_interractive_or_exit
                get_refresh_token_by_script_fork "$@"
        fi
        
}

my_dirname=`dirname $0`
generate_token "$@"