#!/bin/bash

#
## Installation of self hosted git service Gitea

readonly toolName="gitea"
readonly giteaLatestUrl="https://api.github.com/repos/go-gitea/gitea/releases/latest"
readonly giteaVersion=$(curl --silent "$giteaLatestUrl" | grep -Po '"tag_name": "v\K.*?(?=")')
readonly giteaDir="/usr/local/bin"
readonly giteaServiceLoc="/etc/systemd/system/gitea.service"
readonly giteaLogDir="/var/log/gitea"
readonly giteaDownFile="/tmp/giteaDown"
readonly giteaUser="git"

giteaArch=
giteaDownloadEval='https://dl.gitea.io/gitea/${giteaVersion}/gitea-${giteaVersion}-linux-${giteaArch}'
giteaDownload=$(eval echo $giteaDownloadEval)
giteaIniLoc=
versionNow=

seq_config() {
  if ! initSeqConfig "${seq_configName:?}" "${seq_configTemplate:?}" ; then
    # End if no configuration file exists
    dry || return 1
  fi

  if [ -z $giteaVersion ] ; then
    error -e "Couldn't determine latest version of $toolName"
  fi
  [ ! -z "$(command -v gitea)" ] && versionNow=$(gitea --version | sed 's/.*version \([0-9.]\+\).*/\1/')

  checkArchitecture
  giteaIniLoc="${SEQ_GITEA_CONF_DIR}/app.ini"

  info    "Gitea work:    $SEQ_GITEA_WORK_DIR"
  info -a "Gitea config:  $SEQ_GITEA_CONF_DIR"
  info -a "Git user home: $SEQ_GITEA_HOME_DIR"
  info
  color yellow
  warning "Don't forget to adapt $SEQ_GITEA_CONF_DIR/app.ini"
  color

  ## Return of non zero value will abort the sequence
  return 0
}

checkArchitecture() {
  [ -n "$giteaArch" ] && return 0
  [ ! -z "$(command -v dpkg)" ] && giteaArch=$(dpkg --print-architecture)
  case $giteaArch in
    armhf)
      giteaArch="arm-6";;
  esac
  giteaDownload="$(eval echo $giteaDownloadEval)"
}

step_1_info() { echo "Updating apt"; }
step_1_alias() { echo "install"; }
step_1() {
  exe apt update
}

step_2_info() {
  checkArchitecture
  echo "Downloading $toolName to user home from:"
  echoinfo "$giteaDownload"
}
step_2() {
  exe wget -O "$giteaDownFile" $giteaDownload
}

step_3_info() { echo "Adding user for $toolName ($giteaUser)"; }
step_3() {
  exe adduser \
    --system \
    --shell /bin/bash \
    --gecos 'Git Version Control' \
    --group \
    --disabled-password \
    --home "$SEQ_GITEA_HOME_DIR" \
    "$SEQ_GITEA_USER"
}

step_4_info() { echo "Create required directory structure"; }
step_4() {
  exe install -o $SEQ_GITEA_USER -g $SEQ_GITEA_USER -m 750 \
    -d "$SEQ_GITEA_BACKUP_DIR" "$SEQ_GITEA_CONF_DIR" \
    "$SEQ_GITEA_HOME_DIR" "$SEQ_GITEA_WORK_DIR"/{custom,data,log}
  exe chown root:$SEQ_GITEA_USER "$SEQ_GITEA_CONF_DIR"
  exe chmod 770 $SEQ_GITEA_CONF_DIR
  info "Creating $giteaLogDir"
  exe install -g $SEQ_GITEA_USER -m 770 -d "$giteaLogDir"
  info -n "Copying gitea to global location and making it executable..."
  exe install -b -m 755 -T "$giteaDownFile" "$SEQ_GITEA_BIN_LOC" && info -d "ok"
  endReturn "Failed to install $SEQ_GITEA_BIN_LOC"
}

step_5_info() { echo "Creating systemd service"; }
step_5() {
  addConf -c "$SEQ_GITEA_SERVICE" "$giteaServiceLoc"
}

step_6_info() { echo "Starting $toolName service"; }
step_6() {
  exe systemctl enable gitea --now
  info "Before proceeding to installation you may need to create a database first with step 10"
  info
  info "Goto http://[yourip]:3000/install and complete installation"
  info
  info "Afterwards please execute step 20 to secure configuration"
}

step_7_info() { echo "Show configuration notes"; }
step_7_alias() { echo "notes"; }
step_7() {
  color green
  cat <<NOTES_END
Final configuration notes for $giteaIniLoc:

[repository]
DEFAULT_CLOSE_ISSUES_VIA_COMMITS_IN_ANY_BRANCH = true

[server]
# Don't show home page
LANDING_PAGE = explore

[mailer]
# Allow local MTA without valid certificate
SKIP_VERIFY = true

[service]
# Use correct user identity when changing files in the web frontend
NO_REPLY_ADDRESS = yourdomain.com

[attachment]
# Allow more archives to be uploaded
ALLOWED_TYPES=application/zip|application/gzip|application/x-zip|application/x-gzip|application/x-shellscript|text/markdown
NOTES_END
}

step_10_info() { echo "Create mysql database for $toolName"; }
step_10() {
  exe "${seq_origin}/mysql.sh" -qq createdb --charset utf8mb4
}

step_12_info() {
  if [ ! -z "$versionNow" ] ; then
    if [ "$giteaVersion" == "$versionNow" ] ; then
      echo "No upgrade available. Already on latest: $versionNow"
    else
      echo "Download new version $giteaVersion to /usr/local/bin"
      echoinfo " - installed version: $versionNow -"
    fi
  else
    echo "Upgrade existing $toolName installation"
  fi
}
step_12_alias() { echo "upgrade"; }
step_12() {
  endIfEmpty versionNow "Please install $toolName first"
  exe wget -O "$giteaDownFile" $giteaDownload
  endReturn "Download failed"

  if [ -f "$SEQ_GITEA_BIN_LOC" ] ; then
    local toolBackup="${SEQ_GITEA_BACKUP_DIR}/gitea_${versionNow}"
    exe service gitea stop
    saveReturn $?
    endReturn
    sqr::echo -n "Backing up existing executable to ${toolBackup}..."
    exe cp -ar "$SEQ_GITEA_BIN_LOC" "$toolBackup" && sqr::echo "ok" || sqr::echo "nok"
  fi
  exe install --backup=none -m 755 -T "$giteaDownFile" "$SEQ_GITEA_BIN_LOC"
  endReturn "Upgrade failed"
  exe service gitea start
}

step_20_info() { echo "Secure settings after installation"; }
step_20() {
  exe chmod 750 "$SEQ_GITEA_CONF_DIR"
  exe chmod 644 "$giteaIniLoc"
}

step_22_info() { echo "Open $toolName config file"; }
step_22_alias() { echo "config"; }
step_22() {
  exe vi "$giteaIniLoc"
}

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