#!/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.

tmp=temp_file

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 "$tmp" -print0)
else
  langFiles=("$@")
  for langFile in "${langFiles[@]}"; do
    if [[ ! -w $langFile ]]; then
      printf "%s\n" "File \"$langFile\" not found or not writable." ""
      exit 1
    fi
  done
fi

# First thing, we want to strip default of any "!" and duplicates.
grep -v '^!' default | sort -Vu > "$tmp"
mv "$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+=("$(grep -Ev '^($|#|\!)' "$file" | sort -Vu)")

  # 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 < <(grep "^[[:alnum:]].*" default)

  # Form final translation file
  printf "%s\n" "$(grep '^#' "$file" | sort -Vu)" "" "${trLines[@]}" "" "!!!!!!!!!!!!!!!!!!!!!!!!!" "! Untranslated keys follow; remove the ! prefix after an entry is translated." "!!!!!!!!!!!!!!!!!!!!!!!!!" "" "${newLines[@]}" > "$file"
  t2="$(date +%s)"
  tt=$((t2-t1))
  printf "%s\n" " - took $tt seconds"
done