#! /bin/bash

# params
DIFF_FILTER=DR

# functions
build-diff()
{
  DIFF_TAG_FROM=$1
  DIFF_TAG_TO=${2//v/}
  DIFF_PATH_TO=$3 # todo use $2 by default

  if [ ! -f upgrade/upgrade-sample.php ]; then
    echo "Sample file not found"
    exit 1
  fi

  if [ "$DIFF_PATH_TO" == "" ]; then
    CURRENT_DIFF=$(git diff --name-status --diff-filter=$DIFF_FILTER "$DIFF_TAG_FROM" | grep "\tretailcrm/" | grep --invert-match "\tretailcrm/config.*.xml" |  awk '{print $2}')
  else
    CURRENT_DIFF=$(git diff --name-status --diff-filter=$DIFF_FILTER "$DIFF_TAG_FROM" "$DIFF_PATH_TO" | grep "\tretailcrm/" | grep --invert-match "\tretailcrm/config.*.xml" |  awk '{print $2}')
  fi

  if [ "$CURRENT_DIFF" != "" ]; then
    echo "$CURRENT_DIFF" >> upgrade/tmp-diff
#    echo "$CURRENT_DIFF" > "upgrade/tmp-diff ($DIFF_TAG_FROM to $DIFF_TAG_TO)"

    FILES_TO_DELETE=$(echo "$CURRENT_DIFF" | awk 'BEGIN {FS=" "; printf "[\\n"} {printf "\t\t'\''%s'\',\\\\n' ", $1} END {print "\t]" }' )
    DIFF_TAG_TO_UND=$(echo "$DIFF_TAG_TO" | sed 's/\./_/g' )
    DIFF_TAG_TO_ESC=$(echo "$DIFF_TAG_TO" | sed 's/\./\\\./g' )

    UPGRADE_SCRIPT=$(cat upgrade/upgrade-sample.php)
    UPGRADE_SCRIPT=$(echo "$UPGRADE_SCRIPT" | sed "s=\['sample'\]=$FILES_TO_DELETE=")
    UPGRADE_SCRIPT=$(echo "$UPGRADE_SCRIPT" | sed "s/upgrade_module_sample/upgrade_module_$DIFF_TAG_TO_UND/")
    UPGRADE_SCRIPT=$(echo "$UPGRADE_SCRIPT" | sed "s/to version sample/to version $DIFF_TAG_TO_ESC/")

    echo "$UPGRADE_SCRIPT" > upgrade/upgrade-"$DIFF_TAG_TO".php

    # if [ ! -f retailcrm/upgrade/upgrade-"$DIFF_TAG_TO".php ]; then
    #   echo "$UPGRADE_SCRIPT" > retailcrm/upgrade/upgrade-"$DIFF_TAG_TO".php
    # fi
  fi
}

# get count of found files and remove temp files
build-diff-count()
{
    if test -f upgrade/tmp-diff; then
      sort upgrade/tmp-diff | uniq > upgrade/diff
      echo "Found $(wc -l < upgrade/diff) files"

      rm upgrade/tmp-diff
      rm upgrade/diff
    fi
}

# compare current index with latest tag
build-diff-latest-tag()
{
  CURRENT_TAG=$(git tag | tail -n 1)
  NEW_TAG=$(cat VERSION)

  if [ "$CURRENT_TAG" == "v$NEW_TAG" ] && [ "$1" != "force" ]; then
        echo "You should update module version at 'VERSION' first"
        echo "Or use 'force' argument"
        exit 0
  fi

  echo "Diff from $CURRENT_TAG to $NEW_TAG"
  build-diff "$CURRENT_TAG" "$NEW_TAG"
}

# get all tags
build-diff-all-tags()
{
  OLDEST_TAG=$(git tag | head -n 1)
  NEWEST_TAG=$(git tag | tail -n 1)
  ALL_TAGS=$(git tag | cat)
  PREVIOUS_TAG=$OLDEST_TAG

  echo "Diff from $OLDEST_TAG to $NEWEST_TAG"

  for CURRENT_TAG in $ALL_TAGS ; do
    if [ "$CURRENT_TAG" == "$PREVIOUS_TAG" ]; then
      continue;
    fi

    build-diff "$PREVIOUS_TAG" "$CURRENT_TAG" "$CURRENT_TAG"

    if [ "$CURRENT_TAG" == "$NEWEST_TAG" ]; then
      break;
    fi

    PREVIOUS_TAG=$CURRENT_TAG
  done
}


# go to root
SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
cd "$SCRIPT_DIR/../" || exit

# todo fetch tags

if [ "$1" == "all" ]; then
  build-diff-all-tags
else
  build-diff-latest-tag "$1"
fi

build-diff-count

echo 'Done'