#!/bin/bash
# SPDX-License-Identifier: MIT

set -e

PS4='${BASH_SOURCE[0]}:$LINENO: ${FUNCNAME[0]}:  '
SELF_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
source $SELF_DIR/forgejo-lib.sh

: ${FORGEJO_RUNNER_CONFIG:=$SELF_DIR/runner-config.yaml}
: ${DIR:=$(pwd)}

function dependencies() {
    if ! which make curl daemon > /dev/null ; then
	apt-get install -y -qq make curl daemon
    fi
}

function download() {
    local runner_repository="$1"
    local version="$2"

    if ! which forgejo-runner > /dev/null; then
	if ! curl -L --fail -sS $runner_repository/releases/download/$version/forgejo-runner-${version#v}-linux-amd64 > /usr/local/bin/forgejo-runner ; then
	    # backward compatibility for for the naming scheme prior to 3.0.0
	    curl -L --fail -sS $runner_repository/releases/download/$version/forgejo-runner-linux-amd64 > /usr/local/bin/forgejo-runner
	fi
	chmod 755 /usr/local/bin/forgejo-runner
    fi
}

function register() {
    local forgejo="$1"
    mktemp -d > $DIR/forgejo-runner-home
    $DIR/forgejocli actions generate-runner-token | tee $DIR/forgejo-runner-token
    (
	cd $DIR
	timeout --signal=KILL 30 forgejo-runner register --no-interactive --instance "$forgejo" --name runner --token $(cat $DIR/forgejo-runner-token) --labels docker:docker://code.forgejo.org/oci/node:20-bookworm,ubuntu-latest:docker://code.forgejo.org/oci/node:20-bookworm,self-hosted:lxc://debian:bookworm
    )
}

function run() {
    rm -f $DIR/forgejo-runner.log
    daemon --chdir=$DIR --unsafe \
	   --env="TERM=$TERM" --env="HOME=$(cat $DIR/forgejo-runner-home)" --env="PATH=$PATH" --env="USER=$USER" --env="TERM=dumb" --env="USERNAME=$USERNAME" --env="LANG=$LANG" \
	   --pidfile=$DIR/forgejo-runner-pid --errlog=$DIR/forgejo-runner.log --output=$DIR/forgejo-runner.log -- \
	   forgejo-runner --config $FORGEJO_RUNNER_CONFIG daemon
    sleep 1
    cat $DIR/forgejo-runner.log
}    

function reload() {
    teardown
    run
}

function setup() {
    local default_runner_repository="$(cat $SELF_DIR/RUNNER_REPOSITORY)"
    local runner_repository="${1:-${default_runner_repository}}"
    local default_version="$(cat $SELF_DIR/RUNNER_VERSION)"
    local version="${2:-${default_version}}"
    local forgejo="${3:-$(cat $DIR/forgejo-url)}"

    dependencies
    if [[ "$version" =~ ^@ ]] ; then
	local branch=${version##@}
	build_runner $runner_repository $branch
    else
	download $runner_repository $version
    fi
    register $forgejo
    run
}

function teardown() {
    stop_daemon forgejo-runner $DIR
    rm -fr $(cat $DIR/forgejo-runner-home)
}

"$@"