#!/bin/bash
# shellcheck disable=SC1090 # dynamically sourced file

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

# Clone sequncer to target directory
if ! git clone $SEQGITURL "$SEQUENCER_DIR"; 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"