#!/bin/bash
[[ ! $GITEA_DIR ]] && export GITEA_DIR=$(dirname $(cd $(dirname $(readlink -f $BASH_SOURCE));pwd -P))
export GITEA_GITHUB_REPO=go-gitea/gitea

# finds current installed version
function version () {
  # https://askubuntu.com/a/952479/478337
  [[ $1 ]] && export GITEA_BIN=$1
  [[ ! $GITEA_BIN ]] && return 3 && echo no bin file path passed
  [[ ! -f $GITEA_BIN ]] && echo "" && return 2
  CUR_VER=$($GITEA_BIN -version | sed -nr 's:.*version ([^ ]+).*:\1:p')
   [ ! $CUR_VER ] && return 1
   echo $CUR_VER
}

# sets system operating system that is supported
function get_OS () {
  case "$OSTYPE" in
    # uncomment valid OS
    darwin*)  OS=darwin ;;
    linux*)   OS=linux ;;
    # msys*)    OS=windows ;;
    *) ;;
  esac
  [ ! $OS ] && return 1
  echo $OS
}

# gets system architecture supported
function get_arch () {
declare -A ARCHES
#ARCHES=( ["arm64"]="arm64" ["aarch64"]="arm64"  ["x86_64"]="amd64" ["armv61"]="armv6"  ["armv71"]="armv7"  ["arm32"]="armv7"  ["armhf"]="armv7" )
# set valid architectures
ARCHES=( ["arm64"]="arm64" ["aarch64"]="arm64"  ["x86_64"]="amd64" )
ARCH=${ARCHES[$(uname -m)]}
[ ! $ARCH ] && return 1
echo $ARCH
}

# get list of installed gitea themes in /frontend/$1/public/css
function get_theme_list () {
  local themes=""
  for theme in $1/theme*.css; do
     themes+=$(basename $theme .css | cut -c 7-),
   done
   themes+=gitea,arc_green
   echo $themes
}

# sets the environment variables for gitea managment based on instance name
function set_env () {

unset GITEA_INSTANCE
unset GITEA_BIN
unset GITEA_DATA_DIR

local Env_file
local Dir
declare OPTARG
declare OPTION
declare OPTIND=0

[[ ! $GITEA_DIR ]] && export GITEA_DIR=$(dirname $(cd $(dirname $(readlink -f $BASH_SOURCE));pwd -P))
[[ ! $GITEA_DIR ]] && echo main directory not set, aborting && return 2

while getopts 'tiud:' OPTION; do
    case "$OPTION" in
      d) Dir=$OPTARG ;;
      *) ;;
      esac
  done
shift $(( $OPTIND - 1 ))

[[ $1 ]] && export GITEA_INSTANCE=$1
[[ ! $GITEA_INSTANCE ]] && echo warning no gitea instance set using \'default\' && export GITEA_INSTANCE=default
Env_file=$GITEA_DIR/env/$GITEA_INSTANCE.env
[[ -f $Env_file ]] && source $Env_file || echo info: no environment found $Env_file

# env | grep GITEA
# echo ---

[[ ! $GITEA_BIN ]] && GITEA_BIN="$GITEA_DIR/gitea.bin"
[[ $GITEA_BIN == */ ]] && GITEA_BIN="${GITEA_BIN}gitea.bin"
[[ ! $GITEA_BIN == /* ]] && GITEA_BIN="$GITEA_DIR/$GITEA_BIN"
export GITEA_BIN

# option overrides environment file
GITEA_DATA_DIR=${Dir:-$GITEA_DATA_DIR}
GITEA_DATA_DIR=${GITEA_DATA_DIR:-$GITEA_DIR/data}
[[ ! $GITEA_DATA_DIR == /* ]] && GITEA_DATA_DIR="$GITEA_DIR/$GITEA_DATA_DIR"
export GITEA_DATA_DIR

}

# generates .ini from corresponding .tmpl file
function ini_gen () {

[[ ! $GITEA_DIR ]] && export GITEA_DIR=$(dirname $(cd $(dirname $(readlink -f $BASH_SOURCE));pwd -P))

  local Ini
  local Lock=true
  declare OPTARG
  declare OPTION
  declare OPTIND=0

  while getopts 'itud:' OPTION; do
      case "$OPTION" in
        i) Lock=false ;;
        *) ;;
        esac
  done
 shift $(( $OPTIND - 1 ))

  GITEA_INSTANCE=$1

  [[ ! $GITEA_INSTANCE ]] && set_env "$@"

  echo $Lock
  echo ini_gen
  env | grep GITEA

  Ini=$GITEA_DIR/config/$GITEA_INSTANCE

  if [[ -f "$Ini.tmpl" ]]; then

  _Header=";################################################################
  ;# THIS FILE IS GENERATED. Do not edit directly                 #
  ;# It was created from $Ini.tmpl                                #
  ;# Edit this file and run with -t or run ini-gen to regenerate  #
  ;################################################################"
  # https://stackoverflow.com/a/22819516/4695378
  # search and replace data entries in template file
  echo -e "$_Header" > $Ini.ini
  cat $Ini.tmpl | \
  sed 's:@@_server_dir:'$GITEA_DATA_DIR':'g | \
  sed 's:\(INSTALL_LOCK *= \)\(.*\):\1'${Lock}':' | \
  sed 's:\(THEMES *= \)\(.*\):\1'"$(get_theme_list $GITEA_DIR/frontend/current/public/css)"':' \
  >> $Ini.ini
   echo info: $Ini.ini file was generated from $Ini.tmpl
 else
   echo warning: no file "$Ini.tmpl", no ini file was generated
  fi
}

# downloads gitea binary based on OS and Architecture and whether it needs updating
# if you have run into github api anonymous access limits which happens during debugging/dev
# then run with user and token environment variables or source separate file
function download_bin () {

  # dependencies, jq
  [[ $(command -v jq &> /dev/null) ]] && echo jq is required, install via \'sudo apt install jq\' && exit
  # echo passed stuff: $@
  [[ ! $GITEA_DIR ]] && export GITEA_DIR=$(dirname $(cd $(dirname $(readlink -f $BASH_SOURCE));pwd -P))
  [[ ! $GITEA_BIN ]] && set_env "$@"
  [[ ! $GITEA_BIN ]] && echo a Gitea binary path not set, aborting && exit 1

  local TokenFile
  declare OPTARG
  declare OPTION
  declare OPTIND=0

  while getopts 'fg:itud:' OPTION; do
    case "$OPTION" in
      g) TokenFile=$OPTARG ;;
      f) Force=true ;;
      *) ;;
      esac
    done

  shift $(( $OPTIND - 1 ))

  echo "#### Gitea Binary Upgrade or Install ###"

  [[ -f $GITEA_BIN ]] && echo Checking for upgrade of $GITEA_BIN || echo no current gitea binary at $GITEA_BIN
  OS=$(get_OS)
  ARCH=$(get_arch)
  [[ ! $OS ]] && echo non supported OS $OS && exit
  [[ ! $ARCH ]] && echo non supported architecture $ARCH && exit
  echo Gitea Binary for: Operating System $OS, Architecture $ARCH
  RECORD=$(curl -u $GITHUB_USER:$GITHUB_TOKEN -s https://api.github.com/repos/$GITEA_GITHUB_REPO/releases/latest)
  NEW_VER=$(echo $RECORD | jq -r '.tag_name')
  [ "$NEW_VER" ] && echo $NEW_VER is latest version available from  https://github.com/$GITEA_GITHUB_REPO/releases
  # echo Checking current installed Gitea binary version
  VER=$(version)
  if [[ "$NEW_VER" == "v$VER" ]]; then
      echo "Gitea binary is up to date"
      if [[ $Force ]]; then
        echo Forcing option set. Downloading/Overwriting existing binary with same version
      else
        echo "Nothing to upgrade, exiting"
        return 0
      fi
    else
        [[ $VER ]] && echo updating v$VER to $NEW_VER || echo no current installed gitea binary, installing $NEW_VER
    fi

  URL=$(echo $RECORD | \
    jq -r \
    --arg os $OS \
    --arg arch $ARCH \
    --arg archnot "$ARCH." \
    '.assets[] | select(  .name | contains($os)) |
      select (.name | contains($arch)) |
      select (.name | contains($archnot) | not )
      .browser_download_url' \
    )

  [[ -f ${TokenFile:-$HOME/.github} ]] && source ${TokenFile:-$HOME/.github}

  if [[ $GITHUB_TOKEN ]]; then
  echo "using access github token with script >>> $GITHUB_USER:$GITHUB_TOKEN"
  fi
# URL=""
  if [ $URL ]; then
  echo "Downloading Gitea Binary at $URL"
  # wget --user=-u $GITHUB_USER --password=$GITHUB_TOKEN -q --show-progress -O $GITEA_BIN $URL
  if ( [[ $? -eq 0 ]] &&   [[ "$NEW_VER" == *"$(version)"* ]] ); then
    chmod +x $GITEA_BIN
    echo upgrade succeeded, $GITEA_BIN version is $(version)
  else
    echo upgrade from $URL failed
    return 1
  fi
  else
   echo unabled to determine download url
   return 2
  fi

}