# Routines for interacting with docker


# Check if docker is installed
_check_docker_installed() {
    if ! command -v docker &> /dev/null; then
        echo "Docker is not installed"
        return 1
    fi

    # check if docker daemon is running
    if ! docker info &> /dev/null; then
        echo "Docker daemon is not running"
        return 1
    fi

    # check if user has permission to run docker
    if ! docker run --rm hello-world &> /dev/null; then
        echo "User does not have permission to run docker"
        return 1
    fi

    return 0
}

# Check if a container exists
_is_container_exists() {
    if ! docker ps -a --format "{{.Names}}" | grep -q "^$1$"; then
        return 1
    fi
    return 0
}

# Check if a container is running
_is_container_running() {
    if ! docker ps --format "{{.Names}}" | grep -q "^$1$"; then
        return 1
    fi
    return 0
}

# get contianer ID
_get_container_id() {
    docker ps --format "{{.ID}}" --filter "name=$1"
}

# get container status
_get_container_status() {
    docker ps --format "{{.Status}}" --filter "name=$1"
}

# start container that exists
_start_container() {
    _is_container_exists $1 || return 1
    _is_container_running $1 && return 0
    docker start $1
}

# stop container that exists
_stop_container() {
    _is_container_running $1 || return 0;
    docker stop $1
}   

# remove container that exists
_remove_container() {
    _stop_container $1
    _is_container_exists $1 || return 0;
    docker rm $1
}

# get container logs
_get_container_logs() {
    if ! _is_container_exists $1; then
        echo "Container $1 does not exist"
        return 1
    fi

    docker logs $1
}