#!/usr/bin/env bash
# kenku --- crawl and reproduce github actions
# Copyright © 2026 bdunahu <bdunahu@operationnull.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.
#
#
# Takes a file with a repository identifier per line, like this:
#
# actions/deploy-pages v4
# actions/upload-pages-artifact v4
# astral-sh/setup-uv v7
# actions/setup-python v2
# actions/checkout v2
#
# And writes an equivalent file with what it's using. 'using' in this case can
# be one of the standard action types in the github actions lingo: 'node',
# 'docker', or 'composite'.
# The `actions.yaml` or `actions.yml` file does a pretty good job explaining
# what is used or not.

function curl_action {
    curl -s \
         -H "Accept: application/vnd.github+json" \
         -H "Authorization: Bearer ${TOKEN}" \
         "https://api.github.com/repos/$1?ref=$2"
}

function find_action {
    owner=$(echo "$1" | awk -F'/' '{print $(1)}')
    repo=$(echo "$1" | awk -F'/' '{print $(2)}')
    fname=$(echo "$1" | cut -d'/' -f3-)
    sha="$2"

    path="$owner/$repo/contents/$fname"

    if [[ "$path" =~ \.(yml|yaml)$ ]]; then
        action=$(curl_action "$path" "$sha")
        exists=true
    else
        for c in action.yml action.yaml; do
            p="$path/$c"

            action=$(curl_action "$p" "$sha")

            # endpoint doesn't exist
            exists=$(echo "$action" | jq -e 'has("message") | not')
            [[ "$exists" == true ]] && break
        done
    fi

    using=$("$exists" && {
                echo "$action" \
                    | jq -r '.content' \
                    | base64 -d \
                    | grep -E '^\s*"?using"?:' \
                    | sed -E 's/.*"?using"?:[[:space:]]*//'
            } || echo "NO_FILE"
         )
    [[ -z "$using" ]] && using="NO_USING"
    echo "$1 $sha $using"
}

while read -r action sha; do
    find_action "$action" "$sha"
done