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#!/bin/bash

set -eo pipefail

[ `whoami` != root ] && (
  echo "Please run this script as ROOT (sudo)."
  exit 1
)

SELF=`which "$0"`
TEMPLATE_BASE=/usr/share/$(basename $SELF)/templates
WWW_DIR=$HOME/www
SRC_DIR=`pwd`
NG_ETC_DIR=/etc/nginx
HOSTS=/etc/hosts

[ -d $TEMPLATE_BASE ] || mkdir -p $TEMPLATE_BASE

usage() {
  echo "USAGE: $0 [new|help] (app_name [-t template_name])"
}

new_app() {
  APP="$1"
  TEMPLATE="php"
  [[ -z "$APP" ]] && (
    echo "Missing app name."
    usage
    exit 1
  )
  if [[ "$2" == "-t" ]]; then
    [[ -z "$3" ]] && (
      echo "Missing template name."
      usage
      exit 1
    )
    TEMPLATE="$3"
  fi

  echo "Setting up ${APP} using ${TEMPLATE} template."

  TEMPLATE="${TEMPLATE_BASE}/${TEMPLATE}.conf"
  [[ -f "$TEMPLATE"  ]] || (
    echo "ERROR: $TEMPLATE does not exist!"
    exit 1
  )

  echo "----> Linking source to $WWW_DIR..."
  [ -L "$WWW_DIR/$APP" ] || (
    pushd $WWW_DIR > /dev/null
    ln -s $SRC_DIR $APP
    chown -h $SUDO_USER:$SUDO_USER $APP
    popd > /dev/null
  )

  echo "----> Generating config from template..."
  OUTPUT=`hostname="${APP}.dev" app_root="${WWW_DIR}/${APP}" ruby -e "require 'erb'; puts ERB.new(File.read('${TEMPLATE}')).result"`

  SITE="$NG_ETC_DIR/sites-available/${APP}.dev"
  echo "----> Writing config to $SITE..."

  echo -e "$OUTPUT" > $SITE

  echo "----> Enabling site..."
  if [ ! -L "$NG_ETC_DIR/sites-enabled/${APP}.dev" ]; then
    pushd "$NG_ETC_DIR/sites-enabled" > /dev/null
    ln -s ../sites-available/${APP}.dev ${APP}.dev
    popd > /dev/null
  fi

  echo "----> Adding host entry..."
  [[ `grep ${APP}.dev ${HOSTS}` ]] || (echo "127.0.0.1 ${APP}.dev" >> $HOSTS)

  echo "----> Reloading NGINX..."
  service nginx reload || (
    echo "        Configuration error in NGINX!"
    cat "$NG_ETC_DIR/sites-available/${APP}.dev"
    exit 1
  )

  echo "Done! Visit http://${APP}.dev/"
}

remove_app() {
  APP=$1
  echo "Removing app ${APP}..."

  echo "----> Removing host entry..."
  sed -i "/${APP}.dev/d" $HOSTS

  echo "----> Disabling site..."
  rm ${NG_ETC_DIR}/sites-enabled/${APP}.dev || true
  echo "----> Removing site config..."
  rm ${NG_ETC_DIR}/sites-available/${APP}.dev || true

  echo "----> Removing www link..."
  rm "$WWW_DIR/${APP}" || true

  echo "----> Reloading NGINX..."
  service nginx reload || (
    echo "        Configuration error in NGINX!"
    exit 1
  )

  echo "Done! ${APP} removed."
}

[ $# -lt 1 ] && usage && exit 1

case "$1" in
  new)
    shift
    new_app $@
    ;;

  remove)
    shift
    echo "Warning: You are about to remove the NGINX config for $1."

    remove_app $@
    ;;

  --help | help)
    usage
    exit 0
    ;;

    *)
      echo "Unknown command: '$1'"
      usage
      exit 1
      ;;
esac

server {
  server_name     <%= ENV['hostname'] %>;
  access_log      /var/log/nginx/nginx.access.log;
  error_log       /var/log/nginx/nginx.error.log;
  default_type  application/x-php;

  root    <%= ENV['app_root'] %>;
  index   index.html index.htm index.php;

  try_files $uri $uri/ /index.php?it=$uri&$args;

  location ~ \.php$ {
    root            <%= ENV['app_root'] %>;
    fastcgi_index   index.php;
    fastcgi_split_path_info		  ^(.+\.php)(.*)$;
    fastcgi_param  SCRIPT_FILENAME   $document_root$fastcgi_script_name;
    fastcgi_param  PATH_INFO		 $fastcgi_path_info;
    fastcgi_param  HTTP_MOD_REWRITE  On;
    include         fastcgi_params;
    fastcgi_pass    php;
  }
}