#!/usr/bin/env nix-shell
#!nix-shell -i bash -p coreutils curl gitMinimal gzip gnugrep gnused xmlformat

set -euo pipefail
set -x

URL='https://www.edrdg.org/kanjidic/kanjidic2.xml.gz'
TMP="$(mktemp -d)"

PROJECT_ROOT="$(git rev-parse --show-toplevel)"
DATA_DIR="$PROJECT_ROOT/kanjidic2"

function cleanup {
  rm -rf "$TMP"
}
trap cleanup EXIT

curl -L -o "$TMP/kanjidic2.xml.gz" "$URL"
gzip -dkc "$TMP/kanjidic2.xml.gz" > "$TMP/kanjidic2.xml"
xmlformat "$TMP/kanjidic2.xml" > "$TMP/kanjidic2_formatted.xml"
mv "$TMP/kanjidic2_formatted.xml" "$DATA_DIR/kanjidic2.xml"

FILE_VERSION="$(\
  head -n 1000 "$DATA_DIR/kanjidic2.xml" \
  | grep -Eo '<file_version>[0-9]+</file_version>' \
  | sed 's|</\?file_version>||g' \
)"

DB_VERSION="$(\
  head -n 1000 "$DATA_DIR/kanjidic2.xml" \
  | grep -Eo '<database_version>[0-9-]+</database_version>' \
  | sed 's|</\?database_version>||g' \
)"

CREATION_DATE="$(\
  head -n 1000 "$DATA_DIR/kanjidic2.xml" \
  | grep -Eo '<date_of_creation>[0-9-]+</date_of_creation>' \
  | sed 's|</\?date_of_creation>||g' \
)"

echo "$CREATION_DATE.$DB_VERSION.$FILE_VERSION" > "$DATA_DIR/version.txt"

cleanup