#!/bin/bash

SEQGITURL="https://winklerfamilie.eu/git/efelon/shell_sequencer.git"
DEFAULT_DIR="/opt/sequencer"
DEFAULT_USER_SEQS="/opt/seqs"
SEQUENCER_DIR=

# Get script working directory
WDIR="$(cd "$(dirname -- "${BASH_SOURCE[0]}")" >>/dev/null 2>&1 && pwd)"

SEQUENCER_DIR="$1"

# Installation directory was not set by argument -d
if [ -z "$SEQUENCER_DIR" ]; then
  [ -w "$(dirname "$DEFAULT_DIR")" ] && SEQUENCER_DIR="$DEFAULT_DIR"
  # Fallback to working directory
  [ -z "$SEQUENCER_DIR" ] && $SEQUENCER_DIR="${WDIR}/sequencer"
fi

# Check if already installed
if [ -d "$SEQUENCER_DIR" ]; then
  echo " [E] Sequencer seems to be already installed at:"
  echo "     $SEQUENCER_DIR"
  exit 1
fi
if [ ! -w "$(dirname $SEQUENCER_DIR)" ]; then
  echo " [E] Your user has no permission to write to $(dirname $SEQUENCER_DIR)"
  exit 2
fi

# Install git if neccessary
which git >>/dev/null 2>&1
if [ $? != 0 ]; then
  echo " [W] Git not found and will be installed"
  apt update 
  if [ $? != 0 ]; then
    echo " [W] Cannot update apt repositories"
  fi
  apt install git -y
  if [ $? != 0 ]; then
    echo " [E] Cannot install git via apt"
    exit 3
  fi
fi

# Clone sequncer to target directory
git clone $SEQGITURL "$SEQUENCER_DIR"
if [ $? -ne 0 ]; then
  echo " [E] Error cloning git repository:"
  echo "     $SEQGITURL"
  exit 4
fi

# If available use configuration
. ${SEQUENCER_DIR}/sequencer.cfg >/dev/null 2>&1

# Set to default if not configured
[ -z "$SEQUENCER_USER_SEQS" ] && SEQUENCER_USER_SEQS="$DEFAULT_USER_SEQS"

# Install sequncer script
ln -s "${SEQUENCER_DIR}/sequencer/sequencer.sh" "/usr/local/bin"
if [ "$SEQUENCER_USER_SEQS" != "$SEQUENCER_DIR/seqs" ]; then
  ln -sT "${SEQUENCER_DIR}/seqs" "${SEQUENCER_USER_SEQS}"
fi

echo " [I] Successfully installed shell sequencer"
echo "     to: $SEQUENCER_DIR"