#!/usr/bin/env bash
#

set -euo pipefail

SCRIPT_DIR="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
ETC_DIR="${SCRIPT_DIR}/etc"
ENV_FILE="${SCRIPT_DIR}/.env"

[ -e "${ENV_FILE}" ] && . "${ENV_FILE}"

# This is a manual mapping of versions of codes_and_flags.yaml from:
# * https://github.com/UniversalDependencies/docs-automation/commits/master/codes_and_flags.yaml
# (identified by commit hash) matched to the closest date of UD versions from:
# * https://github.com/UniversalDependencies/docs
declare -A VER_MAPPING
VER_MAPPING["2.7"]="a5124b817c04ee6c8b01b80b2adad518b06aa9b4"
VER_MAPPING["2.8"]="26d595cd549e904a4d49b62fccb33602c9d18eb8"
VER_MAPPING["2.9"]="6167b04d6dc5d953f4007dcd75b5fbbf8c7645d6"
VER_MAPPING["2.10"]="953b1c6e70836b7a64b764e24f578ca787cfd89c"
VER_MAPPING["2.11"]="25ee28cd173c2fee5e3a7ad493a4c6e137e13f6b"
VER_MAPPING["2.12"]="32a51d28787795eea1c2e11b3572087a3dc228ac"
VER_MAPPING["2.13"]="6712e116f6fda486223e183f56ffb8921695d4a6"
VER_MAPPING["2.14"]="dabe6c89701b6127b867e27c0256eb4f9dfa9d46"
VER_MAPPING["2.15"]="b3b3d95333d603db6aede3601a3cf9929b3470ae"
VER_MAPPING["2.16"]="bc0cc9b94112253e3ea1e00b2dbe3a46c5f53fe3"
VER_MAPPING["2.17"]="e3847a587baa2a5a7345049b8b2c109ad2162c21"
VER_MAPPING["2.18"]="e095c8dc229690bcb7fa73622b06ed62500e9115"
VER_MAPPING["latest"]="e095c8dc229690bcb7fa73622b06ed62500e9115"

###################
#############
#
# USAGE
#
usage() { OUTPUT=${1:-"verbose"}
echo "Usage: $0 [-o] [--ud-ver VER] [-a]" >&2
[ "${OUTPUT}" = "short" ] && exit 0
>&2 cat << EOF

Download versions of
* codes_and_flags.yaml
a yaml file mapping UD (long) language names to metadata.

For example:
German:
  flag: DE
  lcode: de
  iso3: deu
  family: IE
  genus: Germanic

Options:
    -h              Print this help message
    -o|--online     Enable online mode: (re-fetch files from GitHub)
    --ud-ver VER    Download one version (default: UD_VER from .env)
    -a|--all        Download all mapped versions
EOF
}
#
######
############
##################

ONLINE_MODE=false
ALL_MODE=false
TARGET_VER="${UD_VER:-2.17}"

VALID_ARGS=$(getopt -o hoau:r: --long help,online,all,ud-ver:,rev: -- "$@")
if [[ $? -ne 0 ]]; then
  usage "short"
  exit 1
fi
eval set -- "$VALID_ARGS"
while [ : ]
do
  case "$1" in
    -o | --online) ONLINE_MODE=true; shift   ;;
    -a | --all)    ALL_MODE=true;    shift   ;;
    -u | --ud-ver | -r | --rev) TARGET_VER="$2";  shift 2 ;;
    -h | --help)   usage;            shift   ; exit 0;;
    --)                              shift   ; break ;;
    *) >&2 echo Unsupported option: $1; usage; exit 1;;
  esac
done

download_codes_and_flags() {
    local ver="$1"
    local git_hash="$2"
    local codes_and_flags_fn="${ETC_DIR}/codes_and_flags-${ver}.yaml"
    local codes_and_flags_raw_url="https://raw.githubusercontent.com/UniversalDependencies/docs-automation/${git_hash}/codes_and_flags.yaml"

    if [[ "${ONLINE_MODE}" != true ]] && [[ -e "${codes_and_flags_fn}" ]]; then
        return 0
    fi

    if command -v curl >/dev/null 2>&1; then
        curl -fL --retry 3 --retry-delay 1 "${codes_and_flags_raw_url}" -o "${codes_and_flags_fn}"
    elif command -v wget >/dev/null 2>&1; then
        wget "${codes_and_flags_raw_url}" -O "${codes_and_flags_fn}"
    else
        python3 - "${codes_and_flags_raw_url}" "${codes_and_flags_fn}" <<'PY'
import sys
from urllib.request import urlretrieve

urlretrieve(sys.argv[1], sys.argv[2])
PY
    fi
}

mkdir -p "${ETC_DIR}"

declare -a TARGET_VERSIONS=()
if [[ "${ALL_MODE}" == true ]]; then
    mapfile -t TARGET_VERSIONS < <(printf '%s\n' "${!VER_MAPPING[@]}" | awk '/^[0-9]+\.[0-9]+$/' | sort -V)
    if [[ -n "${VER_MAPPING[latest]:-}" ]]; then
        TARGET_VERSIONS+=("latest")
    fi
else
    if [[ -z "${VER_MAPPING[${TARGET_VER}]:-}" ]]; then
        >&2 echo "Unsupported version: ${TARGET_VER}"
        >&2 echo "Available versions: $(printf '%s ' "${!VER_MAPPING[@]}" | sed 's/ $//')"
        exit 1
    fi
    TARGET_VERSIONS+=("${TARGET_VER}")
    # Keep codes_and_flags-latest.yaml in sync when downloading a single version.
    if [[ "${TARGET_VER}" != "latest" ]] && [[ -n "${VER_MAPPING[latest]:-}" ]]; then
        TARGET_VERSIONS+=("latest")
    fi
fi

for ver in "${TARGET_VERSIONS[@]}"; do
    download_codes_and_flags "${ver}" "${VER_MAPPING[${ver}]}"
done