{ mariadb-client
, python3
, nodejs
, writeShellApplication
, frappe-app
, erpnext-app
, frappe-erpnext-assets
, erpnext-nginx-conf
}:
let
  penv = python3.buildEnv.override {
    extraLibs = [
      python3.pkgs.frappe
      python3.pkgs.erpnext
      python3.pkgs.bench
    ];
  };
in writeShellApplication {
  name = "run-erpnext";
  runtimeInputs = [mariadb-client nodejs penv];
  text = ''
    export PYTHON_PATH=${penv}/${python3.sitePackages}

    tmp=/tmp/erpnext

    mkdir -p $tmp/apps $tmp/sites $tmp/config/pids $tmp/logs/nginx $tmp/env/bin

    ln -s ${frappe-app}/share/apps/frappe $tmp/apps/frappe
    ln -s ${erpnext-app}/share/apps/erpnext $tmp/apps/erpnext
    ln -s ${frappe-erpnext-assets}/share/sites/assets $tmp/sites/assets
    ln -s ${penv} $tmp/env
    ln -s ${erpnext-nginx-conf} $tmp/nginx-erpnext.conf

    cat > $tmp/sites/apps.txt <<EOF
    frappe
    erpnext
    EOF

    cat >$tmp/sites/common_site_config.json <<EOF
    {
      "db_host": "localhost",
      "db_port": 3306,
      "db_name": "erpnext" ,
      "db_password": "erpnext" ,
      "redis_cache": "redis://localhost:6379?db=0",
      "redis_queue": "redis://localhost:6379?db=1",
      "redis_socketio": "redis://localhost:6379?db=2",
      "socketio_port": 3000
    }
    EOF

    # Upstream initializes the DB with this command
    # TODO: Make this idempotent
    cd $tmp
    bench new-site localhost --mariadb-root-password password --admin-password admin
    bench --site localhost install-app erpnext

    echo "Workdir: $tmp"
    # TODO: Run these as systemd units
    node $tmp/apps/frappe/socketio.js &
    gunicorn --chdir="$tmp/sites" --bind=0.0.0.0:9090 --threads=4 --workers=2 --worker-class=gthread --worker-tmp-dir=/dev/shm --timeout=120 --preload frappe.app:application
  '';
}