#!/usr/bin/env bash
#
# This script is based on:
# https://github.com/UniversalDependencies/docs-automation
#
# ./fetch_ud_repos.sh -h
#

# Set default vars and names directories and output files
[ -e .env ] && . .env
ONLINE_MODE=false
UD_VER=${UD_VER:-"2.15"}
UD_REV="r${UD_VER}"
UDS_SUBDIR="UD_repos"; mkdir -p ${UDS_SUBDIR}
GIT_API_OUTPUT=".UniversalDependencies.repos"
GIT_SUBMODULES_ADD=".UD_submodules_add.commands"

# Additional arguments for the `git submodule add` command(s)

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

Identify all relevant UD repositories from GitHub:
* https://github.com/UniversalDependencies/
and generate a list of submodules to add to a (newly created) repository in the
subdirectory ${UDS_SUBDIR}/.

    "${GIT_API_OUTPUT}" contains the (saved) list of GitHub repositories; the
        file can be updated by running this script with the '-o|--online' option.
    "${GIT_SUBMODULES_ADD}" contains the list of submodules to add to the main
        repository.

Options:
    -h              Print this help message
    -o|--online     Enable online mode: (re-fetch UD repos from GitHub instead
                    of using ${GIT_API_OUTPUT})
    -r|--rev VER    The UD GitHub tagged version to checkout (default: ${UD_VER})
EOF
}
#
######
############
##################

VALID_ARGS=$(getopt -o hor: --long help,online,rev: -- "$@")
if [[ $? -ne 0 ]]; then
  usage "short"
  exit 1;
fi

eval set -- "$VALID_ARGS"
while [ : ]
do
  case "$1" in
    -o | --online) ONLINE_MODE=true; shift   ;;
    -r | --rev)    UD_VER="$2";      shift 2 ;;
    -h | --help)   usage;            shift   ; exit 0;;
    --)                              shift   ; break ;;
    *) >&2 echo Unsupported option: $1; usage; exit 1;;
  esac
done

set -uo pipefail

# Function to get github API content
get_github_api_content() {

    # We are interested in these keys:
    #
    #    "git_url": "git://github.com/UniversalDependencies/docs.git",
    #    "ssh_url": "git@github.com:UniversalDependencies/docs.git",
    #    "clone_url": "https://github.com/UniversalDependencies/docs.git",
    #    "svn_url": "https://github.com/UniversalDependencies/docs",
    #    "homepage": "http://universaldependencies.org/",
    #
    # -> "clone_url"

    #This will last us to 500 repositories (UD has 460+ as of 2026)
    (for pg in 1 2 3 4 5; do wget "https://api.github.com/orgs/UniversalDependencies/repos?page=$pg&per_page=100" -O - ; done ) \
            | grep clone_url \
            | grep -Po 'https://.*?(?=")' \
        > ${UDS_SUBDIR}/${GIT_API_OUTPUT}
}

# Check if the online argument is present
if [[ $ONLINE_MODE == true ]] || [[ ! -e ${UDS_SUBDIR}/${GIT_API_OUTPUT} ]]; then
  # Download github API content
  get_github_api_content
fi


MSG=""
echo "" > ${UDS_SUBDIR}/${GIT_SUBMODULES_ADD}
for r in $(cat ${UDS_SUBDIR}/${GIT_API_OUTPUT} | sort)
do
    l=$(echo $r | perl -pe 's/.*\///' | cut -f 1 -d.)

    # Process all potential UD_ repos
    if [[ $l == UD_* ]] && [[ $l != UD_v2 ]]
    then
        # Create a file for the full set
        echo "git submodule add --depth 1 -- $r $l" \
            >> ${UDS_SUBDIR}/${GIT_SUBMODULES_ADD}

        # Missing subdir
        if [[ ! -e ${UDS_SUBDIR}/$l ]]
        then
            # git submodule add
            # [-b <branch>] [-f|--force] [--name <name>] [--reference <repository>]
            # [--ref-format <format>] [--depth <depth>] [--] <repository> [<path>]

            MSG="$MSG\n${UDS_SUBDIR}/$l"
        fi
    fi
done

# git show-ref refs/tags/${UD_REV}
# echo "git submodule --quiet foreach 'export name; bash -c \"(git fetch --depth 1 origin refs/tags/${UD_REV}:refs/tags/${UD_REV} ) || (echo \$name; pushd ../..; git submodule deinit -f \$name; popd)\" '" >> ${GIT_SUBMODULES_ADD}
echo "git submodule --quiet foreach 'export name; bash -c \"( REF=\$(git ls-remote --exit-code origin refs/tags/${UD_REV} | cut -f1) && [ ! -z \\\$REF ] && git fetch --depth=1 origin \\\$REF && git checkout \\\$REF && echo \\\$REF > .tag-${UD_REV}) || ( echo No rev:${UD_REV} \\\$name )\" ' " >> ${UDS_SUBDIR}/${GIT_SUBMODULES_ADD}
echo "git submodule --quiet foreach git status -s | grep -v .tag-" >> ${UDS_SUBDIR}/${GIT_SUBMODULES_ADD}


echo "Missing repos:"
echo -e "$MSG"

if [[ ! -e ${UDS_SUBDIR}/.git ]]
then
    echo "${UDS_SUBDIR}: "'missing .git: run `git init` in subdirectory!'
fi