#!/bin/bash
set -e

stateDir="$1"
moveArg="$2"

scriptPath="$(cd $(dirname $0) && pwd)"
supportRoot="$(cd $scriptPath/../../.. && pwd)"
checkoutRoot="$(cd $supportRoot/../.. && pwd)"

function usage() {
  echo "usage: $0 <statePath>"
  echo "Restores build state from <statePath> into the places where the build will look for it"
  exit 1
}

if [ "$stateDir" == "" ]; then
  usage
fi

move=false
if [ "$moveArg" == "--move" ]; then
  move=true
fi

if [ "$stateDir" != "/dev/null" ]; then
  stateDir="$(cd $stateDir && pwd)"
fi
if [ "$OUT_DIR" == "" ]; then
  OUT_DIR="$checkoutRoot/out"
else
  GRADLE_USER_HOME="$OUT_DIR/.gradle"
fi
if [ "$DIST_DIR" == "" ]; then
  DIST_DIR="$OUT_DIR/dist"
fi
if [ "$GRADLE_USER_HOME" == "" ]; then
  GRADLE_USER_HOME="$(cd ~ && pwd)/.gradle"
fi

# makes the contents of $2 match the contents of $1
function copy() {
  from="$1"
  to="$2"
  rm "$to" -rf
  if [ -e "$from" ]; then
    mkdir -p "$(dirname $to)"
    if [ "$move" == "true" ]; then
      mv "$from" "$to"
    else
      cp --preserve=all -rT "$from" "$to"
    fi
  else
    rm "$to" -rf
  fi
}

function restoreState() {
  backupDir="$1"
  echo "Restoring state from $backupDir"
  copy "$backupDir/out"              "$OUT_DIR"
  copy "$backupDir/dist"             "$DIST_DIR"         # might be inside OUT_DIR
  copy "$backupDir/gradleUserHome"   "$GRADLE_USER_HOME" # might be inside OUT_DIR
  copy "$backupDir/support/.gradle"  "$supportRoot/.gradle"
  copy "$backupDir/buildSrc/.gradle" "$supportRoot/buildSrc/.gradle"
  copy "$backupDir/local.properties" "$supportRoot/local.properties"
}

restoreState $stateDir