#!/bin/bash

## Download Drupal, CiviCRM, dependencies, and useful development tools.
## Setup basic symlinks.
##
## Maybe, when drush or composer is more mature, we can eliminate this.

## Determine the absolute path of the directory with the file
## absdirname <file-path>
function absdirname() {
  pushd $(dirname $0) >> /dev/null
    pwd
  popd >> /dev/null
}

BINDIR=$(absdirname "$0")
PRJDIR=$(dirname "$BINDIR")
TMPDIR="$PRJDIR/app/tmp"
LOCKFILE="$TMPDIR/civi-download-tools.lock"
LOCKTIMEOUT=90
CIVIXVER=15.04.1
CIVIXURL="http://downloads.sourceforge.net/project/civix/civix-${CIVIXVER}.tar.bz2?r=http%3A%2F%2Fsourceforge.net%2Fprojects%2Fcivix%2Ffiles%2F&use_mirror=master"
CVURL="https://download.civicrm.org/cv/cv.phar-83e03d3"
HUBTAG="v1.12.4"
HUBURL="https://github.com/github/hub"
DRUSH8URL=http://files.drush.org/drush.phar
IS_QUIET=
IS_FORCE=
IS_FULL=

##################################################
## Parse arguments
while [ -n "$1" ] ; do
  OPTION="$1"
  shift

  case "$OPTION" in
    -q|--quiet)
      ## Don't display advisory comments
      ## Only display messages if we're actually making changes
      IS_QUIET=1
      ;;

    -f|--force)
      ## (Re)-download everything
      IS_FORCE=1
      ;;

    --full)
      ## Heuristically identify/download system packages.
      IS_FULL=1
      ;;

    --dir)
      set -e
        [ ! -d "$1" ] && mkdir "$1"
        pushd "$1" >> /dev/null
          PRJDIR=$(pwd)
        popd >> /dev/null
        BINDIR="$PRJDIR/bin"
        TMPDIR="$PRJDIR/app/tmp"
        LOCKFILE="$TMPDIR/civi-download-tools.lock"
      set +e
      shift
      ;;

    *)
      echo "Unrecognized option: $OPTION"
      echo "Usage: $0 [-q|--quiet] [-f|--force] [--full] [--dir <path>]"
      ;;
  esac
done

###############################################################################
## usage: download_url <url> <out-file>
function download_url() {
  #php -r "echo file_get_contents('$1');" > $2
  if which wget >> /dev/null ; then
    wget -O "$2" "$1"
  elif which curl >> /dev/null ; then
    curl -L -o "$2" "$1"
  else
    echo "error: failed to locate curl or wget"
  fi
}

###############################################################################
## usage: echo_comment <message>
function echo_comment() {
  if [ -z "$IS_QUIET" ]; then
    echo "$@"
  fi
}

###############################################################################
## Ensure that a command is on the PATH. If missing, then give
## advice on possible resolutions and exit.
## usage: check_command <command-name> <required|recommended> [<msg>]
function check_command() {
  local cmd="$1"
  local requirement="$2"
  local msg="$3"
  [ -z "$msg" ] && msg="Failed to locate command \"$cmd\". Please install it (and set the PATH appropriately)."

  cmdpath=$(which $cmd)
  if [ -z "$cmdpath" ]; then
    echo "$msg"
    show_command "$cmd" "It is possible that you have already installed \"$cmd\" in a non-standard location. If so, please update the PATH appropriately. Possible matches were found in:"
    if [ "$requirement" = "required" ]; then
      exit 3
    fi
  fi
}

###############################################################################
## Show a list of possible locations where the command can be found
## usage: show_command <command-name> [<msg>]
function show_command() {
    local cmd="$1"
    local msg="$2"
    local is_first=1
    for altdir in \
      /Applications/MAMP/Library/bin \
      /Applications/MAMP/bin/php/php*/bin \
      /{usr,opt}{,/local}/bin \
      /{usr,opt}{,/local}/*/bin \
      /{usr,opt}{,/local}/lib/*/bin
    do
      if [ -f "$altdir/$cmd" ]; then
        if [ -n "$is_first" ]; then
          echo $msg
          is_first=
        fi
        echo " * $altdir"
      fi
    done
}

###############################################################################
## Debian.org's NodeJS package uses a non-standard name for the node binary.
## If necessary, setup an alias for the standard name.
function nodejs_debian_workaround() {
  if which nodejs >> /dev/null ; then
    if ! which node >> /dev/null ; then
      echo "[[NodeJS binary appears to be misnamed. Creating 'node' alias.]]"
      ln -s "$(which nodejs)" "$BINDIR/node"
    fi
  fi
}

###############################################################################
## Check if a PHP extension is enabled
## usage: check_php_ext <command-name> <required|recommended> [<msg>]
##
## Note: There's not much harm in calling check_php_ext for more requirements,
## but bear in mind that this only handles requirements for buildkit CLI.
## For civicrm-core runtime, the app should have its own checks.
function check_php_ext() {
  local ext="$1"
  local requirement="$2"
  local msg="$3"

  if [ -z "$msg" -a "$requirement" = "required" ]; then
    msg="ERROR: Failed to find required PHP extension \"$ext\"."
  elif [ -z "$msg" -a "$requirement" = "recommended" ]; then
    msg="WARNING: Failed to find recommended PHP extension \"$ext\"."
  fi

  if php -r 'exit((int)in_array("'$ext'", get_loaded_extensions()));' ; then
    echo "$msg"

    if [ "$requirement" = "required" ]; then
      echo ""
      if [ `uname` = "Darwin" ]; then
        echo "TIP: In OS X, it is common to install an alternative PHP bundle, such as MAMP or XAMPP, which provides more extensions by default."
        show_command php "TIP: You may wish to configure a PATH to choose a different version of PHP. The following versions were found automatically:"
      fi
      if [ `uname` = "Linux" ]; then
        echo "TIP: In some systems, the PHP version used in CLI and web are different. Extensions should be active in both."
      fi
      exit 4
    fi
  fi
}

###############################################################################
## Prompt user for confirmation
## (In automated scripts or blank response, use default)
##
## usage: cvutil_confirm <message> <interactive-default> <script-default>
## example: cvutil_confirm "Are you sure? [Y/n] " y y
function cvutil_confirm() {
  local msg="$1"
  local i_default="$2"
  local s_default="$3"
  if tty -s ; then
    echo -n "$msg"
    read _cvutil_confirm
    if [ "x$_cvutil_confirm" == "x" ]; then
      _cvutil_confirm="$i_default"
    fi
  else
    echo "${msg}${s_default}"
    _cvutil_confirm="$s_default"
  fi
  case "$_cvutil_confirm" in
    y|Y|1)
      return 0
      ;;
    *)
      return 1
      ;;
  esac
}

###############################################################################
## Determine the function to handle system package installation
function get_system_installer() {
  if [ -n "$DISTRIB_CODENAME" ]; then
    true
  elif which lsb_release >/dev/null; then
    # Debian doesn't ship with /etc/lsb-release. See
    # https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=444678
    DISTRIB_CODENAME=$(lsb_release -cs)
  elif [ -f "/etc/lsb-release" ]; then
    source /etc/lsb-release
  fi
  case "$DISTRIB_CODENAME" in
    precise|trusty|jessie)
      echo "do_system_$DISTRIB_CODENAME"
      ;;
    *)
      echo do_system_unknown
      ;;
  esac
}

###############################################################################
function do_system_precise() {
  set -e
    PACKAGES="acl git wget unzip mysql-server mysql-client php5-cli php5-imap php5-ldap php5-curl php5-mysql php5-intl php5-gd php5-mcrypt php-apc apache2 libapache2-mod-php5 nodejs ruby rake"
    echo "Detected \"Ubuntu Precise 12.04\"."
    echo ""
    echo "Recommended packages: $PACKAGES"
    echo ""
    if cvutil_confirm "Run automated installation? [Y/n] " y y; then
      curl -sL https://deb.nodesource.com/setup_0.12 | sudo -E bash -
      sudo apt-get -y install $PACKAGES
      sudo a2enmod rewrite
      sudo apache2ctl restart
    else
      echo "Aborted" 1>&2
      exit 1
    fi
  set +e
}

###############################################################################
function do_system_trusty() {
  set -e
    PACKAGES="acl git wget unzip mysql-server mysql-client php5-cli php5-imap php5-ldap php5-curl php5-mysql php5-intl php5-gd php5-mcrypt php-apc apache2 libapache2-mod-php5 nodejs-legacy npm ruby rake"
    echo "Detected \"Ubuntu Trusty 14.04\"."
    echo ""
    echo "Recommended packages: $PACKAGES"
    echo ""
    if cvutil_confirm "Run automated installation? [Y/n] " y y; then
      sudo apt-get update
      sudo apt-get -y install $PACKAGES
      sudo php5enmod mcrypt
      sudo php5enmod imap
      sudo a2enmod rewrite
      sudo apache2ctl restart
    else
      echo "Aborted" 1>&2
      exit 1
    fi
  set +e
}

###############################################################################
function do_system_jessie() {
  set -e
    PACKAGES="acl git wget unzip mysql-server mysql-client php5-cli php5-imap php5-ldap php5-curl php5-mysql php5-intl php5-gd php5-mcrypt php-apc apache2 libapache2-mod-php5 nodejs-legacy npm ruby rake"
    echo "Detected \"Debian Jessie\"."
    echo ""
    echo "Recommended packages: $PACKAGES"
    echo ""
    if cvutil_confirm "Run automated installation? [Y/n] " y y; then
      sudo apt-get update
      sudo apt-get -y install $PACKAGES
      sudo php5enmod mcrypt
      sudo php5enmod imap
      sudo a2enmod rewrite
      sudo apache2ctl restart
    else
      echo "Aborted" 1>&2
      exit 1
    fi
  set +e
}

###############################################################################
function do_system_unknown() {
  echo "ERROR: Could not identify the required system packages."
  echo ""
  echo "If you want to add support for a new system, update 'get_system_installer()'"
  echo "and add a new 'do_system_*()' function."
  echo ""
  echo "If you are running Debian, install lsb-release package."
  exit 1
}

##################################################
## Perform system installation (if requested)
if [ -n "$IS_FULL" ]; then
  SYSTEM_FUNC=$(get_system_installer)
  if [[ $SYSTEM_FUNC =~ ^[a-zA-Z0-9_]+$ ]]; then
    $SYSTEM_FUNC
  else
    echo "ERROR: Malformed system function: $SYSTEM_FUNC"
    exit 2
  fi

  if [ ! -f "$PRJDIR/composer.json" ]; then
    set -e
      echo "[[ Clone civicrm-buildkit to $PRJDIR ]]"
      git clone "https://github.com/civicrm/civicrm-buildkit.git" "$PRJDIR"
    set +e
  fi
fi

##################################################
## Validation
check_command php required
check_command mysql required
check_command mysqldump required
check_command git required
check_command tar required
check_command bzip2 required
check_command gzip required

check_php_ext Phar required
check_php_ext SimpleXML required
check_php_ext SPL required
check_php_ext curl required
check_php_ext date required
check_php_ext json required
check_php_ext libxml required
check_php_ext mcrypt required
check_php_ext pcre required
check_php_ext pdo_mysql required
check_php_ext xml required

nodejs_debian_workaround

if [ ! -d "$TMPDIR" ]; then
  mkdir -p "$TMPDIR"
fi

##################################################
## Only allow one concurrent process
if php $BINDIR/pidlockfile.php "$LOCKFILE" $$ 5 ; then
  ## we acquired lock quickly; no need to bug user with output
  true
else
  OLDPID=$(cat "$LOCKFILE")
  echo "[[civi-download-tools: Already locked by PID $OLDPID; waiting up $LOCKTIMEOUT seconds]]"
  if php $BINDIR/pidlockfile.php "$LOCKFILE" $$ $LOCKTIMEOUT ; then
    echo "[[civi-download-tools: Lock acquired]]"
  else
    exit 1
  fi
fi

##################################################
## Begin execution
set -e
pushd $PRJDIR >> /dev/null
  ## Download "composer"
  if [ -z "$IS_FORCE" -a -f "$PRJDIR/bin/composer" ]; then
    echo_comment "[[Composer binary ($PRJDIR/bin/composer) already exists. Skipping.]]"
  else
    echo "[[Download composer]]"
    download_url "https://getcomposer.org/installer" "$TMPDIR/composer-installer"
    php "$TMPDIR/composer-installer" -- --install-dir="$PRJDIR/bin"
    mv "$PRJDIR/bin/composer.phar" "$PRJDIR/bin/composer"
  fi

  ## Download dependencies (via composer)
  COMPOSER_MD5=$(cat composer.json composer.lock | php -r 'echo md5(file_get_contents("php://stdin"));')
  touch "$TMPDIR/composer-data.md5"
  if [ -z "$IS_FORCE" -a "$(cat $TMPDIR/composer-data.md5)" == "$COMPOSER_MD5" ]; then
    echo_comment "[[composer dependencies already installed. Skipping.]]"
  else
    "$PRJDIR/bin/composer" install
    cat composer.json composer.lock | php -r 'echo md5(file_get_contents("php://stdin"));' > "$TMPDIR/composer-data.md5"
  fi

  ## Download dependencies (via npm)
  if which npm > /dev/null ; then
    PACKAGE_MD5=$(cat package.json | php -r 'echo md5(file_get_contents("php://stdin"));')
    touch "$TMPDIR/package-data.md5"
    if [ -z "$IS_FORCE" -a "$(cat $TMPDIR/package-data.md5)" == "$PACKAGE_MD5" -a -d "$PRJDIR/node_modules" ]; then
      echo_comment "[[npm dependencies already installed. Skipping.]]"
    else
      npm install
      cat package.json | php -r 'echo md5(file_get_contents("php://stdin"));' > "$TMPDIR/package-data.md5"
    fi
    for f in node_modules/bower/bin/bower node_modules/karma/bin/karma node_modules/jshint/bin/jshint node_modules/karma-phantomjs-launcher/node_modules/phantomjs/bin/phantomjs ; do
      pushd "$PRJDIR/bin" >> /dev/null
        toolname=$(basename $f)
        if [ ! -e "$toolname" ]; then
          ln -s ../$f $toolname
        fi
      popd >> /dev/null
    done
  fi

  [ ! -d "$PRJDIR/extern" ] && mkdir "$PRJDIR/extern"

  ## Download "civix"
  ## FIXME: Update civix so that it can be installed via composer as a dependency
  mkdir -p "$PRJDIR/extern" && touch "$PRJDIR/extern/civix.txt"
  if [ -z "$IS_FORCE" -a -e "$PRJDIR/bin/civix" -a -d "extern/civix" -a "$(cat $PRJDIR/extern/civix.txt)" == "$CIVIXURL" ]; then
    echo_comment "[[civix binary ($PRJDIR/bin/civix) already exists. Skipping.]]"
  else
    echo "[[Install civix]]"

    ## Cleanup
    [ -e app/tmp/civix ] && rm -rf app/tmp/civix
    [ -e extern/civix ] && rm -rf extern/civix
    [ -e "$TMPDIR/civix.tar.bz2" ] && rm -rf "$TMPDIR/civix.tar.bz2"
    mkdir -p extern/civix

    ## Download
    download_url "$CIVIXURL" "$TMPDIR/civix.tar.bz2"
    tar xj  --strip-components 1 -C extern/civix -f "$TMPDIR/civix.tar.bz2"

    ## Setup a relative symlink
    pushd bin >> /dev/null
      [ -e civix ] && rm -f civix
      ln -s ../extern/civix/civix civix
    popd >> /dev/null

    ## Mark as downloaded
    echo "$CIVIXURL" > "$PRJDIR/extern/civix.txt"
  fi

  ## Download "drush8"
  mkdir -p "$PRJDIR/extern" && touch "$PRJDIR/extern/drush8.txt"
  if [ -z "$IS_FORCE" -a -e "$PRJDIR/bin/drush8" -a "$(cat $PRJDIR/extern/drush8.txt)" == "$DRUSH8URL" ]; then
    echo_comment "[[drush8 binary ($PRJDIR/bin/drush8) already exists. Skipping.]]"
  else
    echo "[[Install drush8]]"
    download_url "$DRUSH8URL" "bin/drush8"
    chmod +x bin/drush8
    echo "$DRUSH8URL" > "$PRJDIR/extern/drush8.txt"
  fi

  ## Download "cv"
  mkdir -p "$PRJDIR/extern" && touch "$PRJDIR/extern/cv.txt"
  if [ -z "$IS_FORCE" -a -e "$PRJDIR/bin/cv" -a "$(cat $PRJDIR/extern/cv.txt)" == "$CVURL" ]; then
    echo_comment "[[cv binary ($PRJDIR/bin/cv) already exists. Skipping.]]"
  else
    echo "[[Install cv]]"
    download_url "$CVURL" "bin/cv"
    chmod +x bin/cv
    echo "$CVURL" > "$PRJDIR/extern/cv.txt"
  fi

  ## Download "hub"
  touch "$PRJDIR/extern/hub.txt"
  if [ -z "$IS_FORCE" -a -e "$PRJDIR/extern/hub/bin/hub" -a -e "$PRJDIR/bin/hub" -a "$(cat $PRJDIR/extern/hub.txt)" == "$HUBURL $HUBTAG" ]; then
    echo_comment "[[hub ($PRJDIR/extern/hub) already exists. Skipping.]]"
  elif [ -z "`which ruby`" -o -z "`which rake`" ]; then
    echo_comment "[[hub requires Ruby and Rake (which are unavailable). Skipping.]]"
  else
    echo "[[Install hub]]"

    ## Cleanup
    [ -e app/tmp/hub ] && rm -rf app/tmp/hub
    [ -e extern/hub ] && rm -rf extern/hub
    mkdir -p app/tmp extern/hub

    ## Download
    git clone "$HUBURL" app/tmp/hub
    pushd app/tmp/hub
      git checkout $HUBTAG
    popd

    ## Build
    pushd app/tmp/hub >> /dev/null
      PREFIX="$PRJDIR/extern/hub" rake install
    popd >> /dev/null

    ## Setup a relative symlink
    pushd bin >> /dev/null
      [ -f hub ] && rm -f hub
      ln -s ../extern/hub/bin/hub hub
    popd >> /dev/null

    ## Mark as downloaded
    echo "$HUBURL $HUBTAG" > "$PRJDIR/extern/hub.txt"
  fi

popd >> /dev/null
set +e

##################################################
## Recommendations
##
## Note: Non-fatal recommendations come at the end so that they appear as
## the last output (which is most likely to be read).

check_php_ext bcmath recommended
check_php_ext gd recommended
check_php_ext gettext recommended
check_php_ext hash recommended
check_php_ext imap recommended
check_php_ext intl recommended
check_php_ext mbstring recommended
check_php_ext mysql recommended
check_php_ext openssl recommended
check_php_ext session recommended
check_php_ext zip recommended

check_command node recommended "WARNING: Failed to locate command \"node\". NodeJS (http://nodejs.org/) is required for development of CiviCRM v4.6+."
check_command npm recommended "WARNING: Failed to locate command \"npm\". NodeJS (http://nodejs.org/) is required for development of CiviCRM v4.6+."

##################################################
## Cleanup
rm -f "$LOCKFILE"