#!/usr/bin/env bash

# This script iterates through interface translation files,
# moves comments to the front, puts translated strings next,
# and finally looks for untranslated/missing strings by matching
# against "default" which it then adds to the translation, each
# line prepended by "!".
#
# Developers should run it from the project root after receiving
# a translation file from a translator:
# cp /tmp/new_japanese_translation rtdata/languages/Japanese
# ./tools/generateTranslationDiffs "Japanese"
#
# Running the script without an argument iterates through all files.
#
# Locale files are generated automatically:
# - English (UK)
# - Polish (Latin Characters)

tmp=temp_file
if [[ -w $tmp ]]; then
  rm -v "$tmp"
fi

abort () {
  printf "%s\n" "" "Aborting"
  rm -v "$tmp"
  exit 1
}

trap 'abort' HUP INT QUIT ABRT TERM


cd "rtdata/languages" || { printf "%s\n" "You must run this script from the root of the project."; exit 1; }
# Build array of all interface translation files, or use user-specified ones only
unset langFiles
if [[ $# = 0 ]]; then
  while read -r -d $'\0'; do
    langFiles+=("$REPLY")
  done < <(find . -not -iname "default" -not -iname "LICENSE" -not -iname "README" -not -iname "*.sh"  -not -iname ".*" -not -iname "$tmp" -not -iname "English (UK)" -not -iname "Polish (Latin Characters)" -print0)
else
  langFiles=("$@")
  for langFile in "${langFiles[@]}"; do
    if [[ ! -w $langFile ]]; then
      printf "%s\n" "File \"$langFile\" not found or not writable." ""
      exit 1
    fi
  done
fi

getComments () {
  grep -E "^#.+" "$1" | sort -Vu
}

getChanged () {
  grep -Ev '^(!|#|$)' "$1" | sort -Vu
}

getUnchanged () {
  grep -E "^\!.+" "$1" | sort -Vu
}

# First thing, fix default, so move comments to front, then strip the rest of any "!" and duplicates.
dos2unix default 2>/dev/null
getComments default > "$tmp"
getChanged default >> "$tmp"
mv "$tmp" "default"

for file in "${langFiles[@]}"; do
  t1="$(date +%s)"
  printf "%s" "Processing $file"
  dos2unix "$file" 2>/dev/null
  # printf "%s\n" "Searching $file for changed strings"
  unset trLines newLines
  # Fill trLines with translated text
  trLines+=("$(getChanged "$file")")

  # KEY;String
  # Match "default" keys with those in current translation file. If no match, add !KEY;String
  while read -r 'defLine'; do
    if [[ ! "${trLines[@]}" =~ "${defLine%%;*}" ]]; then
      newLines+=("!${defLine}")
    fi
  done < <(getChanged default)

  # Form final translation file
  if [[ -n "$(getComments "$file")" ]]; then
    printf "%s\n" "$(getComments "$file")" "" >> "$tmp"
  fi
  if [[ -n "${trLines[@]}" ]]; then
    printf "%s\n" "${trLines[@]}" "" >> "$tmp"
  fi
  if [[ -n "${newLines[@]}" ]]; then
    printf "%s\n" "!!!!!!!!!!!!!!!!!!!!!!!!!" "! Untranslated keys follow; remove the ! prefix after an entry is translated." "!!!!!!!!!!!!!!!!!!!!!!!!!" "" "${newLines[@]}" >> "$tmp"
  fi
  mv "$tmp" "$file"
  t2="$(date +%s)"
  tt=$((t2-t1))
  printf "%s\n" " - took $tt seconds"
done

case "${langFiles[@]}" in
  *"./English (US)"*) printf "%s\n" "Creating English (UK) file"
                      getComments "English (US)" > "English (UK)"
                      grep -Ei ".+;.*(color|behavior|center).*" default | \
                      sed -e '/^#/d' -e 'h;s/^[^;]*;//; s/olor/olour/g; x;s/;.*//;G;s/\n/;/' \
                        -e 'h;s/^[^;]*;//; s/ehavior/ehaviour/g; x;s/;.*//;G;s/\n/;/' \
                        -e 'h;s/^[^;]*;//; s/center/centre/g; x;s/;.*//;G;s/\n/;/' \
                        -e 'h;s/^[^;]*;//; s/Center/Centre/g; x;s/;.*//;G;s/\n/;/' >> English\ \(UK\)
                      grep -Evi ".+;.*(color|behavior|center).*" "English (US)" | grep -Ev "^#" >> "English (UK)"
                      ;;&
  *"./Polish"*)       printf "%s\n" "Creating Polish (Latin Characters) file"
                      sed 'y/ĄĆĘŁŃÓŚŹŻąćęłńóśźż/ACELNOSZZacelnoszz/' < Polish > "Polish (Latin Characters)"
                      ;;&
esac
