#!/bin/bash

toolName=element-web
latestUrl="https://api.github.com/repos/vector-im/element-web/releases/latest"

# Get script working directory
# (when called from a different directory)
WDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >>/dev/null 2>&1 && pwd )"
CONFIG=0
CONFIG_FILE_NAME="${toolName}.cfg"
CONFIG_FILE_TEMPLATE="$WDIR/${CONFIG_FILE_NAME}.example"

seq_config() {
  initSeqConfig "$CONFIG_FILE_NAME" "$CONFIG_FILE_TEMPLATE"
  if [ $? -eq 0 ] ; then
    echo "     ${toolName} path:   ${ELEMENT_WEB_LOC}"
    echo "     ${toolName} backup: ${ELEMENT_WEB_BACKUP}"
    CONFIG=1
  fi
}

step_18_info() { echo "Check for updates"; }
step_18_alias() { echo "updatecheck"; }
step_18() {
  shift
  local latestVersion=
  if [ ! -z "${1:-}" ] ; then
    latestVersion="$1"
  else
    latestVersion=$(curl --silent "$latestUrl" | grep -Po '"tag_name": "v\K.*?(?=")')
  fi

  local isInstalled=$(grep -E "${latestVersion}" "${ELEMENT_WEB_LOC}/version" >>/dev/null && echo "1" || echo "0")
  if [ $isInstalled -eq 1 ] ; then
    echo " [I] Version $latestVersion is already installed"
    return 1
  else
    echo " [I] Update to $latestVersion available"
  fi
  return 0
}


step_20_info() { 
  echo -n "Create a backup [ELEMENT WEB ROOT]"
  if [ $CONFIG -ne 0 ] ; then
    echo " at $ELEMENT_WEB_BACKUP"
  else
    echo
  fi
}
step_20_alias() { echo "backup"; }
step_20() {
  shift
  local tempRoot=
  if [ $CONFIG -eq 0 ] ; then
    error -e "No configuration file found"
    return 1
  fi
  if [ ! -z $ELEMENT_WEB_BACKUP ] ; then
    exe mkdir -p "$ELEMENT_WEB_BACKUP"
  fi
  if [ ! -z $1 ] ; then
    tempRoot="$1"
  else
    tempRoot="$ELEMENT_WEB_LOC"
  fi

  local wwwBackup="$ELEMENT_WEB_BACKUP/${toolName}_www_`date +%Y%m%d-%H%M%S`.tar.gz"
  echo " [I] Backing up webserver directory to $wwwBackup"
  exe cd "$tempRoot/.."
  exe tar czf "$wwwBackup" $(basename "$tempRoot")
}

step_22_info() {
  shift
  if [ -z "${1:-}" ] ; then
    echo -n "Get latest version from github"
    if ! contextHelp ; then
      echo ": $(curl --silent "$latestUrl" | grep -Po '"tag_name": "\K.*?(?=")')"
    else
      echo " [CUSTOM VERSION]"
    fi
  else
    echo "Get version $1 from github"
  fi
}
step_22_alias() { echo "upgrade"; }
step_22() {
  shift # don't need step number
  local latestVersion=
  if [ ! -z "${1:-}" ] ; then
    latestVersion="$1"
  else
    latestVersion=$(curl --silent "$latestUrl" | grep -Po '"tag_name": "v\K.*?(?=")')
  fi

  if [ -z $latestVersion ] ; then
    error -e "Cannot determine latest version from github repository"
    return 1
  elif interactive ; then
    echo
    exe read -p "Install $latestVersion to $ELEMENT_WEB_LOC [n]o/(y)es? " answer
    case $answer in
      [yY])
        ;;
      *)
        info -e "Upgrade aborted"
        return 1
        ;;
    esac
  fi

  local isInstalled=$(grep -E "${latestVersion}" "${ELEMENT_WEB_LOC}/version" >>/dev/null && echo "1" || echo "0")
  if [ $isInstalled -eq 1 ] ; then
    echo " [I] Version $latestVersion is already installed"
    return 0
  fi

  # Download
  local downUrl="https://github.com/vector-im/element-web/releases/download/v${latestVersion}/element-v${latestVersion}.tar.gz"
  local tempExtract="$tempDown/element-v$latestVersion"

  if [ ! -e "$tempExtract" ] ; then
    exe mkdir -p "$tempDown"
    exe wget -O "$tempLoc" $downUrl
    endReturn -o $? "Download failed: $downUrl"
    exe cd "$tempDown"
    exe tar -xf "$tempLoc"
    endReturn -o $? "Extract failed: $tempLoc"
  else
    echo " [I] Found existing download: $tempExtract"
  fi

  # Installation
  local tempBu="${ELEMENT_WEB_LOC}_bu_`date +%Y%m%d-%H%M%S`"

  exe mv "$ELEMENT_WEB_LOC" "$tempBu"
  step backup "$tempBu"
  endReturn -o $? "Backup failed; $ELEMENT_WEB_LOC renamed!"
  echo " [I] Installing version $latestVersion to $ELEMENT_WEB_LOC"
  exe mv "$tempExtract" "$ELEMENT_WEB_LOC"
  exe chown -R www-data: "$ELEMENT_WEB_LOC"

  # Configuration
  echo " [I] Copying configuration"
  exe cp -ar "$tempBu/config.json" "$ELEMENT_WEB_LOC/"
  echo " [I] Copying login background"
  exe cp -ar "$tempBu/$tempBackImg/"* "$ELEMENT_WEB_LOC/$tempBackImg/"

  exe rm -rf "$tempBu"
}
tempBackImg="themes/element/img/backgrounds"
tempDown="/tmp/${toolName}"
tempLoc="$tempDown/${toolName}.tar.gz"

step_24_info() { echo "Clean temporary files: $tempDown"; }
step_24_alias() { echo "clean"; }
step_24() {
  exe rm -rf "$tempDown"
}

readonly sqr_minVersion=16
. /usr/local/bin/sequencer.sh