#!/bin/bash

## Take an existing, tar-based CiviCRM directory and convert it to a git working directory

#### Helpers ####

## usage: do_gitify <repo-url> <existing-dir> [git-checkout-options]
function do_gitify() {
  REPO="$1"
  TGT="$2"
  TMP="${TGT}.tmp"
  shift 2

  if [ -d "$TGT/.git" ]; then
    echo "[[Already checked out git repo ($TGT) -- skip $REPO]]"
    return
  fi
  [ -d $TGT ] || mkdir -p "$TGT"
  [ -d $TMP ] && rm -rf "$TMP"
  echo "[[Checkout $REPO ($TMP)]]"
  echo "[git clone "$@" "$REPO" "$TMP"]"
  git clone "$@" "$REPO" "$TMP"

  echo "[[Swap metadata]]"
  mv "$TMP/.git" "$TGT/.git"

  echo "[[Remove local modifications]]"
  pushd "$TGT" > /dev/null
  git checkout -- .
  popd > /dev/null

  rm -rf "$TMP"
}

## usage: do_svnify <repo-url> <existing-dir>
function do_svnify() {
  REPO="$1"
  TGT="$2"
  shift 2

  if [ -d "$TGT/.svn" ]; then
    echo "[[Already checked out SVN repo ($TGT) -- skip $REPO]]"
    return
  fi
  [ -d $TGT ] || mkdir -p "$TGT"
  [ -d $TMP ] && rm -rf "$TMP"
  echo "[[Checkout $REPO ($TMP)]]"

  echo "[svn co \"$REPO\" \"$TGT\"]"
  svn co "$REPO" "$TGT"
}

function check_dep() {
  if [ -z `which git` ]; then
    echo "command not found: git"
    exit
  fi
}

#### Main ####

set -e

CIVICRM_CMS="$1"
GIT_BASE_URL="$2"
CIVICRM_ROOT="$3"
CIVICRM_L10N="$4"
CIVICRM_BRANCH="master"
if [ -z "$CIVICRM_ROOT" -o ! -d "$CIVICRM_ROOT" -o -z "$GIT_BASE_URL" -o -z "$CIVICRM_CMS" ]; then
  echo "Convert a directory into a set of CiviCRM git clones"
  echo "usage: $0 <Drupal|Drupal6|Joomla|WordPress|all> <git-base-url> <existing-civicrm-root> [--l10n]"
  echo "  <cms-name>: one of: Drupal|Drupal6|Joomla|WordPress|all"
  echo "  <git-base-url>: a base URL shared by the desiried git repos (e.g. git://github.com/civicrm)"
  echo "  <existing-civicrm-root>: the main directory containing CiviCRM"
  echo "  [l10n]: optionally fetch localization data; currently requires svn"
  echo ""
  echo "Note: If pointing to a pre-existing directory, your local changes may be replaced by"
  echo "the pristine code from git/svn. If you've made changes, then make sure there's a backup!"
  echo ""
  echo "example: $0 Drupal git://github.com/civicrm /var/www/drupal7/sites/all/modules/civicrm"
  echo "  (checkout core code plus Drupal 7.x integration code using Git's read-only protocol)"
  echo ""
  echo "example: $0 Drupal6 https://github.com/civicrm /var/www/drupal6/sites/all/modules/civicrm"
  echo "  (checkout core code plus Drupal 6.x integration code using read-only HTTP protocol)"
  echo ""
  echo "example: $0 all git@github.com:civicrm ~/src/civicrm l10n"
  echo "  (checkout core code plus Drupal 7.x, Joomla, and WordPress integration code and l10n using SSH)"
  exit 1
fi

check_dep
do_gitify "${GIT_BASE_URL}/civicrm-core.git" "$CIVICRM_ROOT" -b "${CIVICRM_BRANCH}"
do_gitify "${GIT_BASE_URL}/civicrm-packages.git" "$CIVICRM_ROOT/packages" -b "${CIVICRM_BRANCH}"
case "$CIVICRM_CMS" in
  Drupal)
    do_gitify "${GIT_BASE_URL}/civicrm-drupal.git" "$CIVICRM_ROOT/drupal" -b "7.x-${CIVICRM_BRANCH}"
    ;;
  Drupal6)
    do_gitify "${GIT_BASE_URL}/civicrm-drupal.git" "$CIVICRM_ROOT/drupal" -b "6.x-${CIVICRM_BRANCH}"
    ;;
  Joomla)
    do_gitify "${GIT_BASE_URL}/civicrm-joomla.git" "$CIVICRM_ROOT/joomla" -b "${CIVICRM_BRANCH}"
    ;;
  WordPress)
    do_gitify "${GIT_BASE_URL}/civicrm-wordpress.git" "$CIVICRM_ROOT/WordPress" -b "${CIVICRM_BRANCH}"
    ;;
  all)
    do_gitify "${GIT_BASE_URL}/civicrm-drupal.git" "$CIVICRM_ROOT/drupal" -b "7.x-${CIVICRM_BRANCH}"
    do_gitify "${GIT_BASE_URL}/civicrm-joomla.git" "$CIVICRM_ROOT/joomla" -b "${CIVICRM_BRANCH}"
    do_gitify "${GIT_BASE_URL}/civicrm-wordpress.git" "$CIVICRM_ROOT/WordPress" -b "${CIVICRM_BRANCH}"
    ;;
  *)
    echo "Unrecognized CMS: $CIVICRM_CMS"
esac

if [ "$CIVICRM_L10N" == "--l10n" ]; then
  do_svnify "http://svn.civicrm.org/l10n/trunk" "$CIVICRM_ROOT/l10n"
fi