#!/bin/bash
# Run this in a terminal in the troggle directory: 'bash venv-trog.sh'
echo 'Run this in a terminal in the troggle directory: "bash venv-trog.sh"'

# Expects an Ubuntu 20.04 relatively clean install.
# Running using SQLite 3.31.1 2020-01-27 19:55:54
# Many permissions conflicts under WSL2 mean more sudo needed

# If you have not already installed these on your clean Ubuntu install DO THIS FIRST
# /usr/bin/python --version : ensure python is an alias for python3 not python2.7
# sudo apt install sqlite3
# sudo apt install python3-pip  # this installs a shed-load of other stuff: binutils etc.
# sudo apt install python3.9
# sudo apt install python3.9-venv
# sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.9 1

# on WSL there is an oddity that creating a venv trips over a PowerShell permissions issue

# and of course:
# sudo apt update
# sudo apt dist-upgrade

# On a clean debian 11 (bullseye) installation with Xfce & ssh, 
# as debian does not install everything that ubuntu does, you need:
# sudo usermod -a -G sudo expo # to put expo in sudoers group, re-login required
# sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.9 1
# sudo apt install python3-pip
# sudo apt install python3-venv

# copy this file and requirements.txt into the directory above where you want to install the VENV
VENAME=dj32 # python3.9 and django 3.2

if [ -d requirements.txt ]; then
  echo "No requirements.txt found. Copy it from your most recent installation."
  exit 1
fi

python --version

# LOOK HERE: we go up a level so that /$VENAME is parallel to /troggle
cd ..
if [ ! -d $VENAME ]; then
  echo "### Creating venv $VENAME"
  sudo python -m venv $VENAME
else 
  echo "/$VENAME/ already exists ! Delete it first."
  exit 1
fi

  # Activate the virtual env and see what the default packages are
echo "### Activating $VENAME"
cd $VENAME
source bin/activate
echo "### Activated."
  # update local version of pip, more recent than OS version
  # debian bullseye installs pip 20.3.4 which barfs, we want >22.0.3
echo "### installing later version of pip inside $VENAME"
python -m pip install --upgrade pip

PIP=pip

$PIP list > original-pip.list
$PIP freeze >original.txt

ln -s ../expoweb expoweb
ln -s ../troggle troggle
ln -s ../loser loser
ln -s ../drawings drawings
ln -s ../expofiles expofiles

    # Package       Version
    # ------------- ----------
echo '### links to expoweb, troggle etc. complete'
echo '###'
echo '### now installing requirements.txt'
echo '###'

$PIP install -r troggle/requirements.txt

echo '### install from requirements.txt completed.'
echo '### '

$PIP freeze > requirements.txt  
# so that we can track requirements more easily with git

# because we do not install these with pip, but they are listed by the freeze command

# Now find out what we actually installed by subtracting the stuff virtualenv installed anyway
sort original.txt > 1
sort requirements.txt >2
comm -3 1 2 --check-order | awk '{ print $1}'>fresh-requirements.txt
rm 1
rm 2

cp requirements.txt requirements-$VENAME.txt 
cp requirements-$VENAME.txt troggle/requirements-$VENAME.txt

$PIP list > installed-pip.list
$PIP list -o > installed-pip-o.list

REQ=installation-record
mkdir $REQ 
mv requirements-$VENAME.txt $REQ
mv original.txt $REQ
#mv requirements.txt $REQ
mv original-pip.list $REQ
mv installed-pip.list $REQ
mv installed-pip-o.list $REQ
cp fresh-requirements.txt ../requirements.txt
mv fresh-requirements.txt $REQ
cp troggle/`basename "$0"` $REQ

python --version
echo "Django version:"
django-admin --version
echo "### Now do 
  'cd ../$VENAME'
  'source bin/activate'
  'cd troggle'
  'python manage.py test -v 3' "