#!/bin/bash

ALLOWED_ACTIONS='help create start stop delete'
CONFIGURATION_FILE='./configuration/script.properties'

action=''
runner_name=''

gitea_instance_url=''
gitea_runner_registration_token=''

function error() {
    local error_message=$1
    local should_exit=$2
    echo "$error_message" >&2
    echo >&2

    if [[ $should_exit -eq 1 ]]
    then
        exit 1
    fi
}

function print_help() {
    cat << EOF
Usage: bash $0 ACTION [PARAMETERS]...
Handle gitea actions runners.

This helper aims to make easier to create, start, stop and delete gitea actions runners which run in docker containers.

Here are the possible actions:
    - create    Creates a new runner.
    - start     Starts an existing runner.
    - stop      Stops an existing runner.
    - delete    Deletes an existing runner.

Some actions need parameters.
Parameters of action "create":
    - \$1       The name of the runner to create.

Parameters of action "start":
    - \$1       The name of the runner to start.

Parameters of action "stop":
    - \$1       The name of the runner to stop.

Parameters of action "delete":
    - \$1       The name of the runner to delete.

EOF
}

function is_action_allowed() {
    local arg_action=$1
    local action_is_allowed=1

    echo "$ALLOWED_ACTIONS" | grep "$arg_action"
}

function handle_args() {
    local arg_action=$1
    local arg_parameter_1=$2

    if [[ $# -ne 2 ]]
    then
        error 'Bad arguments...' 1
        print_help
    fi

    local action_is_allowed=$(is_action_allowed "$arg_action")
    echo "actions_is_allowed='$action_is_allowed'"
    if [[ -z $action_is_allowed ]]
    then
        error "Unknown action '$arg_action'..."
        print_help

        exit 1
    fi

    action=$arg_action
    runner_name=$arg_parameter_1
}

function get_property() {
    local key=$1
    local value

    value=$(grep "^${key}=" "$CONFIGURATION_FILE" | cut -d '=' -f 2-)

    echo $value
}

function check_configuration() {
    if [[ ! -f $CONFIGURATION_FILE ]]; then
        error 'Configuration file not found!' 1
    fi

    gitea_instance_url=$(get_property 'gitea_instance_url')
    if [[ -z "$gitea_instance_url" ]]
    then
        error 'Gitea instance url should be set into properties file' 1
    fi

    gitea_runner_registration_token=$(get_property 'gitea_runner_registration_token')
    if [[ -z "$gitea_runner_registration_token" ]]
    then
        error 'Gitea runner registration token should be set into properties file' 1
    fi
}

function create_new_runner() {
    echo "Creation of a new runner named '$runner_name'..."

    docker run \
        -v /var/run/docker.sock:/var/run/docker.sock \
        -e GITEA_INSTANCE_URL=$gitea_instance_url \
        -e GITEA_RUNNER_REGISTRATION_TOKEN=$gitea_runner_registration_token \
        -e GITEA_RUNNER_NAME=$runner_name \
        --name $runner_name \
        -d docker.io/gitea/act_runner:latest    
}

function start_runner() {
    echo "Start runner '$runner_name'..."
    docker start $runner_name
}

function main() {
    handle_args "$@"

    check_configuration

    case $action in
        'create')
            create_new_runner
            ;;

        'start')
            start_runner
            ;;

        'stop')
            stop_runner
            ;;

        'delete')
            delete_runner
            ;;
    esac
}

main "$@"