configure

#!/bin/bash

#### Loading / Writing configuration

function load_prev_config() {

    # load the defaults from the file if it exists
    if [ -f ".config/save" ]; then
        source ".config/save";
    
    # else load some defaults
    else
        echo "No saved settings found, loading defaults for local development setup. "
        SET_MATHHUB_PORT="80"
        SET_MATHHUB_PROFILE="latest"
        SET_MATHHUB_UUID="local"
        SET_MATHHUB_SECRET_KEY="not-production-ready"
        SET_MATHHUB_AUTOUPDATE="none"
        SET_MATHHUB_RIBBON=""
    fi;
}

function save_current_config() {
    {
        echo "echo \"Loaded previous settings from $(date)\"";
        echo_save_line "SET_MATHHUB_PROFILE" "$MATHHUB_PROFILE"
        echo_save_line "SET_MATHHUB_PORT" "$MATHHUB_PORT"
        echo_save_line "SET_MATHHUB_UUID" "$MATHHUB_UUID"
        echo_save_line "SET_MATHHUB_SECRET_KEY" "$MATHHUB_SECRET_KEY"
        echo_save_line "SET_MATHHUB_AUTOUPDATE" "$MATHHUB_AUTOUPDATE"
        echo_save_line "SET_MATHHUB_RIBBON" "$MATHHUB_RIBBON"
    } > .config/save

    echo "Wrote .config/save"
}

function echo_save_line() {
    echo "$1='$2'"
}

#### Reading configuration settings

function read_mathhub_profile() {
    cat << EOF
MathHub can run in different so-called profiles. These determine which
branches of the React Frontend and MMT Backend will be used. Please pick
either "devel" or "latest" now use leave this question blank to use
"$SET_MATHHUB_PROFILE". 

EOF

    printf "MATHHUB_PROFILE="
    read MATHHUB_PROFILE
    if [ -z "$MATHHUB_PROFILE" ]
    then
        MATHHUB_PROFILE="$SET_MATHHUB_PROFILE"
    fi;
    echo "export MATHHUB_PROFILE=$MATHHUB_PROFILE"
}

function read_mathhub_uuid() {
    cat << EOF
MathHub requires a per-host-unique UUID to scope particular docker
services appropriatly. Please enter one now or leave this question
blank to use "$SET_MATHHUB_UUID".
EOF

    printf "MATHHUB_UUID="
    read MATHHUB_UUID
    if [ -z "$MATHHUB_UUID" ]
    then
        MATHHUB_UUID="$SET_MATHHUB_UUID"
    fi;
    echo "export MATHHUB_UUID=$MATHHUB_UUID"
}

function read_mathhub_port() {
    cat << EOF
MathHub requires a public port to listen on. Please enter one now or
leave this question blank to use "$SET_MATHHUB_PORT".
EOF

    printf "MATHHUB_PORT="
    read MATHHUB_PORT
    if [ -z "$MATHHUB_PORT" ]
    then
        MATHHUB_PORT="$SET_MATHHUB_PORT"
    fi;
    echo "export MATHHUB_PORT=$MATHHUB_PORT"
}


function read_mathhub_autoupdate() {
    cat << EOF
MathHub can automatically update all components when new versions become 
available. Please pick one of 'none' (disable auto-update), 'news' 
(update the News Container only), or 'all' (auto-update everything).
Defaults to "$SET_MATHHUB_AUTOUPDATE".

EOF

    printf "MATHHUB_AUTOUPDATE="
    read MATHHUB_AUTOUPDATE
    if [ -z "$MATHHUB_AUTOUPDATE" ]
    then
        MATHHUB_AUTOUPDATE="$SET_MATHHUB_AUTOUPDATE"
    fi;
    echo "export MATHHUB_AUTOUPDATE=$MATHHUB_AUTOUPDATE"
}

function read_mathhub_secret_key() {
    cat << EOF
MathHub uses a secret key to safely encrypt session information. The
production key should be kept strictly secret. Please either enter a
secret key now, or leave it blank to use the saved value of
"$SET_MATHHUB_SECRET_KEY".

This key should not contain single or double quotes, otherwise any
character is allowed. 
EOF

    printf "MATHHUB_SECRET_KEY="
    read MATHHUB_SECRET_KEY
    if [ -z "$MATHHUB_SECRET_KEY" ]
    then
        MATHHUB_SECRET_KEY="$SET_MATHHUB_SECRET_KEY"
    fi;
    echo "export MATHHUB_SECRET_KEY=$MATHHUB_SECRET_KEY"
}

function read_mathhub_ribbon() {
    cat << EOF
MathHub can show a certain sets of ribbon to indicate to the user
which version is being used. This should be one of: 'beta', ''.

The default is "$SET_MATHHUB_RIBBON". 
EOF

    printf "MATHHUB_RIBBON="
    read MATHHUB_RIBBON
    if [ -z "$MATHHUB_RIBBON" ]
    then
        MATHHUB_RIBBON="$SET_MATHHUB_RIBBON"
    fi;
    echo "export MATHHUB_RIBBON=$MATHHUB_RIBBON"
}

### Writing configuration

function write_mathhub_profile() {
    cp "profiles/$MATHHUB_PROFILE" .env
    echo "" >> .env
    echo cp "profiles/$MATHHUB_PROFILE" .env
}

function write_env() {
    echo "" >> .env
    echo "# Instance UUID" >> .env
    echo "MATHHUB_UUID=$MATHHUB_UUID" >> .env
    echo "# MathHub Port" >> .env
    echo "MATHHUB_PORT=$MATHHUB_PORT" >> .env
    echo "" >> .env
    echo "Wrote .env"
}

function write_autoupdate_config() {
    cat "updates/$MATHHUB_AUTOUPDATE.update" >> .env
    echo cat "updates/$MATHHUB_AUTOUPDATE.update" '>> .env'
}

function write_admin_config() {
    echo "DJANGO_SECRET_KEY=$MATHHUB_SECRET_KEY" > .config/admin
    
    echo "Wrote .config/admin"
}

function write_mmt_config() {
    touch .config/mmt

    echo "Wrote .config/mmt"
}

function write_config_config() {
    echo "SHOW_RIBBON=$MATHHUB_RIBBON" > .config/letitgo
    
    echo "Wrote .config/letitgo"
}

function main() {
    echo "MATHHUB DOCKER CONFIGURATION"

    load_prev_config

    echo ""
    read_mathhub_uuid

    echo ""
    read_mathhub_profile

    echo ""
    read_mathhub_port

    echo ""
    read_mathhub_secret_key

    echo ""
    read_mathhub_ribbon

    echo ""
    read_mathhub_autoupdate

    echo ""
    echo "WRITING CONFIGURATION"
    
    mkdir -p .config

    save_current_config
    write_mathhub_profile
    write_autoupdate_config
    write_env
    write_admin_config
    write_mmt_config
    write_config_config
    echo "Done. "
}

main