#!/usr/bin/env sh
set -eu

if [ "$#" -gt 1 ]; then
    echo "usage: $0 [WIKI_REPOSITORY_URL]" >&2
    exit 2
fi

script_directory=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)
repository_root=$(CDPATH= cd -- "$script_directory/../.." && pwd)
wiki_repository_url=${1:-}
temporary_directory=$(mktemp -d "${TMPDIR:-/tmp}/openuf-wiki.XXXXXX")

if [ -z "$wiki_repository_url" ]; then
    origin_url=$(git -C "$repository_root" config --get remote.origin.url || true)
    if [ -z "$origin_url" ]; then
        echo "no origin remote found; pass the Gitea Wiki repository URL" >&2
        exit 2
    fi
    source_repository_url=${origin_url%.git}
    repository_parent=${source_repository_url%/*}
    repository_name=${source_repository_url##*/}
    wiki_repository_name=$(
        printf '%s' "$repository_name" | tr '[:upper:]' '[:lower:]'
    )
    wiki_repository_url="$repository_parent/$wiki_repository_name.wiki.git"
fi

cleanup() {
    rm -rf -- "$temporary_directory"
}
trap cleanup EXIT HUP INT TERM

git clone -- "$wiki_repository_url" "$temporary_directory/wiki"

"$script_directory/generate-wiki.py" --output "$temporary_directory/wiki"
"$script_directory/generate-wiki.py" --check \
    --output "$temporary_directory/wiki"

cd "$temporary_directory/wiki"
git add -- Home.md Developer-Guide.md Call-Graph.md Runtime-Flow.md _Sidebar.md

if git diff --cached --quiet; then
    echo "Gitea Wiki is already current"
    exit 0
fi

git -c user.name="openUF documentation bot" \
    -c user.email="actions@openuf.invalid" \
    commit -m "docs: update generated developer wiki"
git push origin HEAD