#!/bin/bash

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

sq_config=0

seq_config() {
  if initSeqConfig "${seq_configName:?}" "${seq_configTemplate:?}" ; then
    echo "     ${toolName} path:   ${ELEMENT_WEB_LOC}"
    echo "     ${toolName} backup: ${ELEMENT_WEB_BACKUP}"
    sq_config=1
  fi
}

step_1_info() { echo "Check for updates"; }
step_1_alias() { echo "updatecheck"; }
step_1() {
  shift
  local latestVersion=
  if [ -n "${1:-}" ] ; then
    latestVersion="$1"
  else
    latestVersion=$(curl --silent "$latestUrl" | grep -Po '"tag_name": "v\K.*?(?=")')
  fi

  if grep -E "${latestVersion}" "${ELEMENT_WEB_LOC:-}/version" >>/dev/null 2>&1 ; then
    info "Version $latestVersion is already installed"
    return 1
  else
    info "Update to $latestVersion available"
  fi
  return 0
}

step_20_info() { 
  echo -n "Create a backup"
  if (( sq_config )) ; then
    echo " at $ELEMENT_WEB_BACKUP"
  else
    echo
  fi
}
step_20_options() { echo "[ELEMENT WEB ROOT]"; }
step_20_alias() { echo "backup"; }
step_20() {
  shift
  local tempRoot=
  if (( ! sq_config )) ; then
    error -e "No configuration file found"
    return 1
  fi
  if [ -n "$ELEMENT_WEB_BACKUP" ] ; then
    exe mkdir -p "$ELEMENT_WEB_BACKUP"
  fi
  if [ -n "${1:-}" ] ; then
    tempRoot="$1"
  else
    tempRoot="$ELEMENT_WEB_LOC"
  fi

  # Clear old backups
  rmold -r 10 "${ELEMENT_WEB_BACKUP}" || true

  local wwwBackup
  wwwBackup="$ELEMENT_WEB_BACKUP/${toolName}_www_$(date +%Y%m%d-%H%M%S).tar.gz"
  info "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": "v\K.*?(?=")')"
    else
      echo
    fi
  else
    echo "Get version $1 from github"
  fi
}
step_22_options() { echo "[CUSTOM VERSION]"; }
step_22_alias() { echo "upgrade"; }
step_22() {
  shift # don't need step number
  local latestVersion=
  if [ -n "${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
    if ! confirm "Install $latestVersion to $ELEMENT_WEB_LOC" ; then
        info -e "Upgrade aborted"
        return 1
    fi
  fi

  if grep -E "${latestVersion}" "${ELEMENT_WEB_LOC}/version" >>/dev/null 2>&1 ; then
    info "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
    info "Found existing download: $tempExtract"
  fi

  # Installation
  local tempBu
  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!"
  info "Installing version $latestVersion to $ELEMENT_WEB_LOC"
  exe mv "$tempExtract" "$ELEMENT_WEB_LOC"
  exe chown -R www-data: "$ELEMENT_WEB_LOC"

  # Configuration
  info "Copying configuration"
  addConf -c -f "$tempBu/config.json" "$ELEMENT_WEB_LOC/config.json"
  info "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"
}

# shellcheck disable=SC2034 # Appears unused
readonly sqr_minVersion=16
# shellcheck disable=SC1091 # Don't follow this source
. /usr/local/bin/sequencer.sh