#!/bin/bash

if [[ -f repos.conf ]]; then
  source repos.conf
fi

# Check out the repository of the specified package from Gerrit or a local repository.
#
# Parameters:
#   name of package used in repository names (e.g., ndn-cxx or NFD)
#   name of package used in variable names (e.g., NDNCXX or NFD)
#
# This function changes the working directory to the directory containing the package source.
prepare_repo() {
  local PACKAGE_NAME=$1
  local PACKAGE_VAR=PACKAGE_$2
  local PACKAGE_SOURCE=${!PACKAGE_VAR}
  if [[ -z $PACKAGE_SOURCE ]]; then
    PACKAGE_SOURCE=branch:master
  fi

  local SOURCE=${PACKAGE_SOURCE%%:*}
  local LOCATION=${PACKAGE_SOURCE#*:}
  if [[ $SOURCE == branch || $SOURCE == gerrit ]]; then
    if [[ $SOURCE == branch ]]; then
      local GERRIT_BRANCH=$LOCATION
    else
      local GERRIT_CHANGE=${LOCATION%%,*}
      local GERRIT_PATCHSET=${LOCATION#*,}
      local GERRIT_BRANCH="refs/changes/$(printf '%02d' $(($GERRIT_CHANGE % 100)))/$GERRIT_CHANGE/$GERRIT_PATCHSET"
    fi

    echo "Checking out from Gerrit: $GERRIT_BRANCH"
    cd prepare
    git init $PACKAGE_NAME
    cd $PACKAGE_NAME
    git pull --depth 1 https://gerrit.named-data.net/$PACKAGE_NAME $GERRIT_BRANCH
  elif [[ $SOURCE == local ]]; then
    echo "Using local copy of $PACKAGE_NAME"
    if [[ ! -d packages/$PACKAGE_NAME ]]; then
      echo "ERROR: No local copy of package $PACKAGE_NAME could be found in prepare"
      exit 1
    fi
    cp -r packages/$PACKAGE_NAME prepare
    cd prepare/$PACKAGE_NAME
  else
    echo "SYNTAX ERROR: Package $PACKAGE_NAME has incorrectly formatted source: $PACKAGE_SOURCE"
    exit 2
  fi
}