#!/bin/bash 

SCRIPT_NAME="$0"
VERSION="__VERSION__"
VENV_PATH="$HOME/.local/src/msspec_venv_$VERSION"

# Check venv path
if ! [ -d "$VENV_PATH" ]; then
   echo "ERROR: Unable to find version $VERSION of msspec!!"
   exit 1
fi

launch_script() {
   . "$VENV_PATH/bin/activate" && python $@
}

show_help () {
   echo "Usage: 1) $SCRIPT_NAME -p [PYTHON OPTIONS] SCRIPT [ARGUMENTS...]"
   echo "       2) $SCRIPT_NAME [-l FILE | -i | -h]"
   echo "       3) eval \$($SCRIPT_NAME -e)"
   echo ""
   echo "Form (1) is used to launch a script"
   echo "Form (2) is used to load a hdf5 data file"
   echo "Form (3) is used to activate the msspec virtual environment"
   echo ""
   echo "List of possible options:"
   echo "    -p   Pass every arguments after this option to the msspec"
   echo "         virtual environment Python interpreter."
   echo "    -i   Run the interactive Python interpreter within msspec"
   echo "         virtual environment."
   echo "    -l   Load and display a *.hdf5 data file in a graphical"
   echo "         window."
   echo "    -h   Show this help message."
}

launch_interpreter() {
     source $VENV_PATH/bin/activate
     echo "Python interpreter of the MsSpec virtual environment."
     echo ""
     echo "This environment includes the following packages:"
     pip list
     echo ""
     echo "Type in <CTRL>+D to exit."
     echo ""
     ipython --profile=msspec
}

load_data() {
   . "$VENV_PATH/bin/activate" && python -m msspec.iodata $1
}

read_yes_no () {
    PROMPT="$1"
    DEFAULT="$2"
    BYPASS="$3"

    ANSWER=""
    RESPONSE=""

    VALID=1
    while test $VALID -ne 0; do
        test "$BYPASS" = "y" || read -p "${PROMPT} (y/n) [${DEFAULT}]? " "RESPONSE"
        ANSWER="${RESPONSE:-${DEFAULT}}"
        case "${ANSWER}" in
            y|n) VALID=0 ;;
            *) echo "Invalid choice, please answer \"y\" or \"n\"."; VALID=1 ;;
        esac
    done
}

uninstall() {
   read_yes_no "This will completely remove msspec from your computer. Are you sure" "n" "$BYPASS"
   case "${ANSWER}" in
      y) rm -rv "$VENV_PATH" && rm "$SCRIPT_NAME" && echo "MsSpec successfully uninstalled." ;;
      n) echo "Uninstallation aborted." ;;
   esac
}



while getopts "hil:p:eu" option; do
   case $option in
      p) shift; launch_script "$@"
         ;;
      i) launch_interpreter
         ;;
      l) load_data "$OPTARG"; shift
         ;;
      e) echo ". $VENV_PATH/bin/activate"
         ;;
      u) uninstall
         ;;
      *|h) show_help
         ;;
   esac
done

if [ $OPTIND -eq 1 ]; then 
   show_help
fi