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

readonly sequencerGitUrl="https://winklerfamilie.eu/git/efelon/shell_sequencer.git"
defaultBranch="master"
readonly defaultDir="/opt/sequencer"
readonly defaultUserSeqs="/opt/seqs"
readonly sequencerBin="/usr/local/bin/sequencer.sh"
sequencerDir=

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

for _ in "$@"; do
  case "${1:-}" in
    --)
      shift && break ;;
    -b|--branch) # Clone a different branch than master
      shift
      defaultBranch="${1:-}"
      shift ;;
  esac
done

sequencerDir="${1:-}"

# Installation directory was not set by argument $1 
if [ -z "${sequencerDir}" ]; then
  [ -w "$(dirname -- "${defaultDir}")" ] && sequencerDir="${defaultDir}"
  # Fallback to working directory
  [ -z "${sequencerDir}" ] && sequencerDir="${workDir}/sequencer"
fi

# Check if already installed
if [ -d "${sequencerDir}" ]; then
  if [[ $(readlink -- "${sequencerBin}") != ${sequencerDir}/sequencer.sh ]] && [[ -e "${sequencerDir}/sequencer.sh" ]] ; then
    echo " [i] Repairing legacy symlink"
    ln -fsT "${sequencerDir}/sequencer.sh" "${sequencerBin}"
  fi 
  echo " [e] Sequencer seems to be already installed at:"
  echo "     ${sequencerDir}"
  exit 1
fi
if [ ! -w "$(dirname -- "${sequencerDir}")" ]; then
  echo " [e] Your user has no permission to write to $(dirname -- "${sequencerDir}")"
  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 --branch "${defaultBranch}" "${sequencerGitUrl}" "$sequencerDir"; then
  echo " [e] Error cloning git repository:"
  echo "     ${sequencerGitUrl}"
  exit 4
fi

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

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

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

echo " [i] Successfully installed shell sequencer"
echo "     to: ${sequencerDir}"