from fabric.api import env, task

from fabric.operations import run

from fabric.contrib.files import upload_template

from utils import loggify, generate_template_files_path, booleanize
from utils import generate_template_build_path, print_console


@task
def docker_ip():
    configuration = env.config

    if configuration.docker.database.host == 'local':
        docker_cmd = 'docker-machine ip default'
        return run(docker_cmd)
    else:
        return configuration.docker.database.host


def docker_run(cmd):
    from fabric.context_managers import prefix

    docker_eval = "eval $(docker-machine env default)"
    with prefix(docker_eval):
        run(cmd)


@task
def generate():
    """
    generates and uploads the docker.yml configuration file based on the
    settings in the yml file for the current branch.

    e.g. if we are using development.yml then it will check for the docker
    settings in there to find out what conf values we want to use when creating
    whatever docker containers we are usign for this branch

    currently, only the development branch is using docker, but I might change
    that in the future.
    """

    configuration = env.config

    if env.debug:
        logger = loggify('docker', 'generate')

    build_path = generate_template_build_path('docker', 'database')
    files_path = generate_template_files_path('docker')

    context = dict()

    context['docker_service_name'] = \
        configuration.docker.database.service_name

    context['docker_container_name'] = \
        configuration.docker.database.container_name

    context['docker_database_env_user'] = \
        configuration.docker.database.env.user

    context['docker_database_env_pass'] = \
        configuration.docker.database.env.password

    context['docker_database_env_db'] = \
        configuration.docker.database.env.dbname

    context['docker_database_image'] = configuration.docker.database.image

    context['docker_database_port_external'] = \
        configuration.server.database.port

    context['docker_database_port_internal'] = \
        configuration.docker.database.port

    context['database_user'] = configuration.server.database.admin.user
    context['database_pass'] = configuration.server.database.admin.password
    context['database_name'] = configuration.server.database.name

    if env.debug:
        for key in context.keys():
            logger.debug("context[{key}] : {value}".format(
                key=key,
                value=context[key]))

        upload_msg = "upload_template(" \
            "\n\tfilename={filename}," \
            "\n\tdestination={destination}," \
            "\n\tcontext={context}," \
            "\n\tuse_jinja=True," \
            "\n\tuse_sudo=False," \
            "\n\tbackup=False," \
            "\n\ttemplate_dir={template_dir})".format(
                filename=configuration.templates.docker.database.src,
                destination=build_path,
                context=context,
                template_dir=files_path)

        logger.debug("upload_msg    : %s" % upload_msg)

        import pprint
        pp = pprint.PrettyPrinter(indent=4)
        print("context:\n")
        pp.pprint(context)

    else:

        config_src = configuration.templates.docker.database.src
        upload_template(
            filename=config_src,
            destination=build_path,
            context=context,
            use_jinja=True,
            use_sudo=False,
            backup=False,
            template_dir=files_path)


@task
def create(container='database'):
    """
    helper function to create a docker-based database container

    container - specifies the type of container being built

    NOTE:
        "container" must have a corresponding value in configuration file
    """
    # configuration = env.config

    if env.debug:
        logger = loggify("docker", 'create')

    build_path = generate_template_build_path('docker', container)

    info_msg = """
Generating container template for {container}, note that
the container paramter of "{container}" must have a
corresponding value in the {branch} configuration file
under "docker"
    """.format(container=container, branch="dev")

    print_console(info_msg, numsep=60)

    dockercompose_cmd = \
        "docker-compose -f {build_path} up -d".format(build_path=build_path)

    if env.debug:
        logger.debug("build_path            : %s" % build_path)
        logger.debug("dockercompose_cmd     : %s" % dockercompose_cmd)
    else:
        docker_run(dockercompose_cmd)


@task
def status():
    docker_run("docker ps -a")


@task
def start(create=False):
    """
    this will start the docker container referenced by container_type

    NOTE: you should have created it with the docker.create method above
    first!

    container_type - the type of container to start
    create - craete if container has not yet been created
    """
    configuration = env.config
    create = booleanize(create)

    docker_start = 'docker start %s' % \
        configuration.docker.database.container_name

    if env.debug:
        print("docker_run(%s)" % docker_start)
    else:
        docker_run(docker_start)


@task
def stop(remove=False):
    """
    remove=False
    this will start the docker container referenced by container_type

    NOTE: you should have created it with the docker.create method above
    first!

    container_type - the type of container to start
    create - craete if container has not yet been created
    """
    configuration = env.config
    remove = booleanize(remove)

    docker_stop = 'docker stop %s' % \
        configuration.docker.database.container_name

    docker_rm = 'docker rm %s' % configuration.docker.database.container_name

    if env.debug:
        print("docker_run(%s)" % docker_stop)
        print("docker_run(%s)" % docker_rm)

    else:
        docker_run(docker_stop)

        if remove:
            docker_run(docker_rm)