import logging
import os

from ..core import KIWI_CONF_NAME, Parser
from ..config import DefaultConfig, LoadedConfig

from ._utils import SubCommand


def user_input(config, key, prompt):
    # prompt user as per argument
    result = input("{} [{}] ".format(prompt, config[key])).strip()

    # store result if present
    if result:
        config[key] = result


def find_exe(program_name):
    for path in os.environ["PATH"].split(os.pathsep):
        exe_file = os.path.join(path, program_name)
        if os.path.isfile(exe_file) and os.access(exe_file, os.X_OK):
            return exe_file

    return None


def user_input_exe(config, program_name):
    exe_file = find_exe(program_name)
    key = 'executables:' + program_name

    if exe_file is not None:
        config[key] = exe_file
    else:
        user_input(config, key, "Enter path to '{}' executable".format(program_name))


class InitCommand(SubCommand):
    command = 'init'

    @classmethod
    def setup(cls):
        parser = Parser.get_subparsers().add_parser(
            cls.command,
            description="Create a new kiwi-config instance"
        )

        parser.add_argument(
            '-f', '--force',
            action='store_true',
            help="Use default values even if {} is present".format(KIWI_CONF_NAME)
        )

    @classmethod
    def run(cls):
        logging.info("Initializing kiwi-config instance in '%s'", os.getcwd())

        if Parser.get_args().force and os.path.isfile(KIWI_CONF_NAME):
            logging.warning("Overwriting existing '%s'!", KIWI_CONF_NAME)
            config = DefaultConfig.get()
        else:
            config = LoadedConfig.get()

        user_input(config, 'version', "Enter kiwi-config version for this instance")

        user_input(config, 'runtime:storage', "Enter local directory for service data")

        user_input(config, 'markers:project', "Enter marker string for project directories")
        user_input(config, 'markers:down', "Enter marker string for disabled projects")

        user_input(config, 'network:name', "Enter name for local docker network")
        user_input(config, 'network:cidr', "Enter CIDR block for local docker network")

        user_input_exe(config, 'docker')
        user_input_exe(config, 'docker-compose')
        user_input_exe(config, 'sudo')

        config.save()