#!/bin/bash

set -e
set -u

# something or other about android and tmux using PREFIX
#: "${PREFIX:=''}"
MY_ROOT=""
if [ -z "${PREFIX-}" ]; then
  MY_ROOT=""
else
  MY_ROOT="$PREFIX"
fi
# Not every platform has or needs sudo, gotta save them O(1)s...
sudo_cmd=""
((EUID)) && [[ -z "${ANDROID_ROOT-}" ]] && sudo_cmd="sudo"

###############################
#                             #
#         http_get            #
# boilerplate for curl / wget #
#                             #
###############################

# See https://git.daplie.com/Daplie/daplie-snippets/blob/master/bash/http-get.sh

http_curl_opts="-fsSL"
http_wget_opts="--quiet"

http_bin=""
http_opts=""
http_out=""

detect_http_bin()
{
  if type -p curl >/dev/null 2>&1; then
    http_bin="curl"
    http_opts="$http_curl_opts"
    http_out="-o"
    #curl -fsSL "$url" -o "$PREFIX/tmp/$pkg"
  elif type -p wget >/dev/null 2>&1; then
    http_bin="wget"
    http_opts="$http_wget_opts"
    http_out="-O"
    #wget --quiet "$url" -O "$PREFIX/tmp/$pkg"
  else
    echo "Aborted, could not find curl or wget"
    return 7
  fi
}

http_get()
{
  if [ -e "$1" ]; then
    rsync -a "$1" "$2"
  elif type -p curl >/dev/null 2>&1; then
    $http_bin $http_curl_opts $http_out "$2" "$1"
  elif type -p wget >/dev/null 2>&1; then
    $http_bin $http_wget_opts $http_out "$2" "$1"
  else
    echo "Aborted, could not find curl or wget"
    return 7
  fi
}

dap_dl()
{
  http_get "$1" "$2"
}

dap_dl_bash()
{
  dap_url=$1
  #dap_args=$2
  rm -rf /tmp/dap-tmp-runner.sh
  $http_bin $http_opts $http_out /tmp/dap-tmp-runner.sh "$dap_url"; bash /tmp/dap-tmp-runner.sh; rm /tmp/dap-tmp-runner.sh
}

detect_http_bin

## END HTTP_GET ##


mvdir_backward_compat()
{
  old_dir=$1
  new_dir=$2
  # The symlink has already been set up, so no need to do anything.
  if [ -L $old_dir ] && [ $(readlink $old_dir) == "$new_dir" ]; then
    return 0
  fi

  if [ -d $old_dir ]; then
    if [ $(ls $old_dir | wc -l) -gt 0 ]; then
      mv ${old_dir}/* ${new_dir}/
    fi
    rm -r ${old_dir}
    #rmdir ${old_dir}
  fi

  ln -snf $new_dir $old_dir
}

###################
#                 #
# Install service #
#                 #
###################

install_for_systemd()
{
  echo ""
  echo "Installing as systemd service"
  echo ""
  mkdir -p $(dirname "$my_app_dir/$my_app_systemd_service")
  dap_dl "$installer_base/$my_app_systemd_service" "$my_app_dir/$my_app_systemd_service"
  $sudo_cmd mv "$my_app_dir/$my_app_systemd_service" "$MY_ROOT/$my_app_systemd_service"
  $sudo_cmd chown -R root:root "$MY_ROOT/$my_app_systemd_service"
  $sudo_cmd chmod 644 "$MY_ROOT/$my_app_systemd_service"

  mkdir -p $(dirname "$my_app_dir/$my_app_systemd_tmpfiles")
  dap_dl "$installer_base/$my_app_systemd_tmpfiles" "$my_app_dir/$my_app_systemd_tmpfiles"
  $sudo_cmd mv "$my_app_dir/$my_app_systemd_tmpfiles" "$MY_ROOT/$my_app_systemd_tmpfiles"
  $sudo_cmd chown -R root:root "$MY_ROOT/$my_app_systemd_tmpfiles"
  $sudo_cmd chmod 644 "$MY_ROOT/$my_app_systemd_tmpfiles"

  $sudo_cmd systemctl stop "${my_app_name}.service" >/dev/null 2>/dev/null
  $sudo_cmd systemctl daemon-reload
  $sudo_cmd systemctl start "${my_app_name}.service"
  $sudo_cmd systemctl enable "${my_app_name}.service"

  echo "$my_app_name started with systemctl, check its status like so"
  echo "  $sudo_cmd systemctl status $my_app_name"
  echo "  $sudo_cmd journalctl -xe -u $my_app_name"
}

install_for_launchd()
{
  echo ""
  echo "Installing as launchd service"
  echo ""
  # See http://www.launchd.info/
  mkdir -p $(dirname "$my_app_dir/$my_app_launchd_service")
  dap_dl "$installer_base/$my_app_launchd_service" "$my_app_dir/$my_app_launchd_service"
  $sudo_cmd mv "$my_app_dir/$my_app_launchd_service" "$MY_ROOT/$my_app_launchd_service"
  $sudo_cmd chown root:wheel "$MY_ROOT/$my_app_launchd_service"
  $sudo_cmd chmod 0644 "$MY_ROOT/$my_app_launchd_service"
  $sudo_cmd launchctl unload -w "$MY_ROOT/$my_app_launchd_service" >/dev/null 2>/dev/null
  $sudo_cmd launchctl load -w "$MY_ROOT/$my_app_launchd_service"

  echo "$my_app_name started with launchd"
}

install_etc_config()
{
  #echo "install etc config $MY_ROOT / $my_app_etc_config"
  if [ ! -e "$MY_ROOT/$my_app_etc_config" ]; then
    $sudo_cmd mkdir -p $(dirname "$MY_ROOT/$my_app_etc_config")
    mkdir -p $(dirname "$my_app_dir/$my_app_etc_config")
    dap_dl "$installer_base/$my_app_etc_config" "$my_app_dir/$my_app_etc_config"
    $sudo_cmd mv "$my_app_dir/$my_app_etc_config" "$MY_ROOT/$my_app_etc_config"
  fi

  $sudo_cmd chown -R www-data:www-data $(dirname "$MY_ROOT/$my_app_etc_config") || true
  $sudo_cmd chown -R _www:_www $(dirname "$MY_ROOT/$my_app_etc_config") || true
  $sudo_cmd chmod 775 $(dirname "$MY_ROOT/$my_app_etc_config")
  $sudo_cmd chmod 664 "$MY_ROOT/$my_app_etc_config"
}

install_service()
{
  install_etc_config
  #echo "install service"

  installable=""
  if [ -d "$MY_ROOT/etc/systemd/system" ]; then
    install_for_systemd
    installable="true"
  fi
  if [ -d "/Library/LaunchDaemons" ]; then
    install_for_launchd
    installable="true"
  fi
  if [ -z "$installable" ]; then
    echo ""
    echo "Unknown system service init type. You must install as a system service manually."
    echo '(please file a bug with the output of "uname -a")'
    echo ""
  fi
  echo ""
}

## END SERVICE_INSTALL ##

# Create dirs, set perms
create_skeleton()
{
  $sudo_cmd mkdir -p /srv/www
  $sudo_cmd mkdir -p /var/log/$my_app_name
  $sudo_cmd mkdir -p /etc/$my_app_name
  $sudo_cmd mkdir -p /var/$my_app_name
  $sudo_cmd mkdir -p /srv/$my_app_name
  $sudo_cmd mkdir -p /opt/$my_app_name
}

# Unistall
install_uninstaller()
{
  #echo "install uninstaller"
  dap_dl "https://git.daplie.com/Daplie/walnut.js/raw/master/uninstall.sh" "./walnut-uninstall"
  $sudo_cmd chmod 755 "./walnut-uninstall"
  $sudo_cmd chown root:root "./walnut-uninstall"
  $sudo_cmd mv "./walnut-uninstall" "/usr/local/bin/uninstall-walnut"
}


# Dependencies
export NODE_PATH=/opt/walnut/lib/node_modules
export NPM_CONFIG_PREFIX=/opt/walnut
$sudo_cmd mkdir -p $NODE_PATH
$sudo_cmd chown -R $(whoami) /opt/walnut
dap_dl_bash "https://git.daplie.com/coolaj86/node-install-script/raw/master/setup-min.sh"

# Install
# npm install -g 'git+https://git@git.daplie.com/Daplie/walnut.js.git#v1'

my_app_name=walnut
my_app_pkg_name=com.daplie.walnut.web
my_app_dir=$(mktemp -d)
#installer_base="https://git.daplie.com/Daplie/walnut.js/raw/master/dist"
#installer_base="$( dirname "${BASH_SOURCE[0]}" )/dist"
installer_base="/srv/walnut/core/dist"

my_app_etc_config="etc/${my_app_name}/${my_app_name}.yml"
my_app_systemd_service="etc/systemd/system/${my_app_name}.service"
my_app_systemd_tmpfiles="etc/tmpfiles.d/${my_app_name}.conf"
my_app_launchd_service="Library/LaunchDaemons/${my_app_pkg_name}.plist"

# Install
install_my_app()
{
  # This function shouldn't need to use $sudo_cmd because it is called immediately after
  # /srv/walnut is chown-ed and we only mess with things in that directory.

  #git clone git@git.daplie.com:Daplie/walnut.js.git
  #git clone https://git.daplie.com/Daplie/walnut.js.git /srv/walnut/core
  mkdir -p /srv/walnut/{core,lib,var,etc,node_modules}
  rm -rf /srv/walnut/core/node_modules
  ln -sf ../node_modules /srv/walnut/core/node_modules
  mkdir -p /srv/walnut/var/sites
  mkdir -p /srv/walnut/etc/org.oauth3.consumer
  mkdir -p /srv/walnut/etc/org.oauth3.provider
  mkdir -p /srv/walnut/etc/client-api-grants
  mkdir -p /srv/walnut/packages/{rest,api,pages,services}

  # backwards compat
  mvdir_backward_compat /srv/walnut/packages/client-api-grants /srv/walnut/etc/client-api-grants
  mvdir_backward_compat /srv/walnut/packages/sites /srv/walnut/var/sites

  pushd /srv/walnut/core
    /opt/walnut/bin/npm install
  popd
}

$sudo_cmd mkdir -p /srv/walnut
$sudo_cmd chown -R $(whoami) /srv/walnut

install_my_app
create_skeleton
install_uninstaller
install_service

$sudo_cmd chown -R www-data:www-data /opt/walnut || true
$sudo_cmd chown -R _www:_www /opt/walnut || true
$sudo_cmd chown -R www-data:www-data /srv/walnut || true
$sudo_cmd chown -R _www:_www /srv/walnut || true
$sudo_cmd chmod -R ug+rwX /srv/walnut
$sudo_cmd chmod -R ug+rwX /opt/walnut
# +s sets the setuid/setgid bit, which when set on directories makes it so anything
# created inside the directory maintains the same user/group (depending on the bits
# set). Any directory created within a directory with those bits set will also have
# those bits set. When setuid or setgid bits are set on a file however it means that
# if the file is executed it will run with the permissions of the user/group no matter
# who actually runs it (see the ping executable for example).
# I'm not sure that all systems actually support the use of these bits.
find /srv/walnut -type d -exec $sudo_cmd chmod ug+s {} \; || true
find /opt/walnut -type d -exec $sudo_cmd chmod ug+s {} \; || true