#!/usr/bin/env bash
set -e
# set -x # Uncomment to Debug

cd "$(dirname "$0")"
# verify packages installed
ERROR=0
if ! command -v python3 &> /dev/null ; then
    echo "python3 could not be found"
    echo "Run 'sudo apt install python3' to fix."
    ERROR=1
fi
if ! python3 -m venv --help &> /dev/null ; then
    echo "venv could not be found"
    echo "Run 'sudo apt install python3-venv' to fix."
    ERROR=1
fi
if [ $ERROR = 1 ] ; then
    echo
    echo "Fix errors and re-run ./start.sh"
    exit 1
fi

# Test for two known broken venv states
if test -e venv; then
    GOOD_VENV=true
    ! test -e venv/bin/activate && GOOD_VENV=false
    pip3 list 1> /dev/null
    test $? -eq 1 && GOOD_VENV=false
    if ! "$GOOD_VENV"; then
        echo "Deleting bad python venv"
        sudo rm -rf venv
    fi
fi

# Create the venv if it doesn't exist
if ! test -e venv; then
    echo "Creating python venv for RaSCSI proxy"
    python3 -m venv venv
    echo "Activating venv"
    source venv/bin/activate
    echo "Installing requirements.txt"
    pip3 install wheel
    pip3 install -r requirements.txt
    git rev-parse HEAD > current
fi

source venv/bin/activate

# Detect if someone updates the git repo - we need to re-run pip3 install.
set +e
git rev-parse --is-inside-work-tree &> /dev/null
if [[ $? -eq 0 ]]; then
    set -e
    if ! test -e current; then
        git rev-parse > current
    elif [ "$(cat current)" != "$(git rev-parse HEAD)" ]; then
        echo "New version detected, updating libraries from requirements.txt"
        pip3 install -r requirements.txt
        git rev-parse HEAD > current
    fi
else
    echo "Warning: Not running from a valid git repository. Will not be able to update the code."
fi
set -e

# parse arguments
while [ "$1" != "" ]; do
    PARAM=$(echo "$1" | awk -F= '{print $1}')
    VALUE=$(echo "$1" | awk -F= '{print $2}')
    case $PARAM in
	-p | --port)
	    PORT="--port $VALUE"
	    ;;
        *)
            echo "ERROR: unknown parameter \"$PARAM\""
            exit 1
            ;;
    esac
    shift
done

echo "Starting RaSCSI proxy..."
python3 rascsi_proxy.py ${PORT}