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

set -ex

: ${LOOPS:=40}
: ${LOOP_DELAY:=10}
DIR=$(mktemp -d)

trap "rm -fr $DIR" EXIT

function dependency_go() {
    if ! which go > /dev/null ; then
	apt-get update
        apt-get install -y -qq wget tar
        wget --quiet https://go.dev/dl/go1.20.4.linux-amd64.tar.gz
        tar zxf go1.20.4.linux-amd64.tar.gz
        export PATH=$PATH:$(pwd)/go/bin
    fi
}

function checkout() {
    local git="$1"
    rm -fr forgejo-runner
    git clone $git forgejo-runner
}

function build_runner() {
    local git="$1"
    local version="${2:-main}"

    (
	checkout "$git"
	dependency_go
	cd forgejo-runner
	git checkout "$version"
	make build
    )
    export PATH=$PATH:$(pwd)/forgejo-runner
    forgejo-runner --version
}

function api() {
    method=$1
    shift
    url=$1
    shift
    path=$1
    shift
    token=$1

    curl --fail -X $method -sS -H "Content-Type: application/json" -H "Authorization: token $token" "$@" $url/api/v1/$path
}

function check_status() {
    local url="$1"
    local repo="$2"
    local sha="$3"

    local state=$(api GET $url repos/$repo/commits/$sha/status | jq --raw-output .state)
    echo $state
    test "$state" != "" -a "$state" != "pending" -a "$state" != "running" -a "$state" != "null"
}

function wait_success() {
    local url="$1"
    local repo="$2"
    local sha="$3"

    for i in $(seq $LOOPS); do
	if check_status "$url" "$repo" "$sha"; then
	    break
	fi
	test "$FORGEJO_RUNNER_LOGS" && tail $FORGEJO_RUNNER_LOGS
	sleep $LOOP_DELAY
    done
    if ! test "$(check_status "$url" "$repo" "$sha")" = "success" ; then
	test "$FORGEJO_RUNNER_LOGS" && cat $FORGEJO_RUNNER_LOGS
	return 1
    fi
}

function push() {
    local directory="$1"
    local url="$2"
    local owner="$3"
    local project="$4"
    local self_action="$5"
    local token="$6"

    local dir="$DIR/$project"
    rsync -a --exclude .git $directory/ $dir/

    local workflows=$dir/.forgejo/workflows/*.yml
    if test "$(echo $workflows)" != "$workflows"; then
	sed -i \
            -e "s|SELF|$url/$owner/$self_action|g" \
	    -e "s|FORGEJO_TOKEN|$token|g" \
	    $dir/.forgejo/workflows/*.yml
    fi
    (
	cd $dir
	git init
	git checkout -b main
	git config user.email root@example.com
	git config user.name username
	git add .
	git commit -m 'initial commit'
	git remote add origin $url/$owner/$project
	git push --force -u origin main
	sha=$(git rev-parse HEAD)
	echo $sha > SHA
	echo sha=$sha
    )
}

function run_workflow() {
    local directory="$1"
    local url="$2"
    local owner="$3"
    local project="$4"
    local self_action="$5"
    local token="$6"

    if test -z "$token"; then
	echo missing token argument
	return 1
    fi

    push "$directory" "$url" "$owner" "$project" "$self_action" "$token"
    wait_success "$url" "$owner/$project" $(cat $DIR/$project/SHA)
}

function push_self_action() {
    local url="$1"
    local owner="$2"
    local self_action="$3"
    local tag="$4"

    local dir="$DIR/self"
    git clone . $dir
    (
	cd $dir
	rm -fr .forgejo .git
	git init
	git checkout -b main
	git remote add origin "$url/$owner/$self_action"
	git config user.email root@example.com
	git config user.name username
	git add .
	git commit -m 'initial commit'
	git push --force origin main
	git tag --force $tag HEAD
	git push --force origin $tag
    )
}

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

dependencies

"$@"