"""Contains UI methods for LE user operations."""
import logging
from textwrap import indent

from certbot import errors
from certbot import util
from certbot._internal.display import util as internal_display_util
from certbot.compat import os
from certbot.display import util as display_util

logger = logging.getLogger(__name__)


def get_email(invalid=False, optional=True):
    """Prompt for valid email address.

    :param bool invalid: True if an invalid address was provided by the user
    :param bool optional: True if the user can use
        --register-unsafely-without-email to avoid providing an e-mail

    :returns: e-mail address
    :rtype: str

    :raises errors.Error: if the user cancels

    """
    invalid_prefix = "There seem to be problems with that address. "
    msg = "Enter email address (used for urgent renewal and security notices)\n"
    unsafe_suggestion = ("\n\nIf you really want to skip this, you can run "
                         "the client with --register-unsafely-without-email "
                         "but you will then be unable to receive notice about "
                         "impending expiration or revocation of your "
                         "certificates or problems with your Certbot "
                         "installation that will lead to failure to renew.\n\n")
    if optional:
        if invalid:
            msg += unsafe_suggestion
            suggest_unsafe = False
        else:
            suggest_unsafe = True
    else:
        suggest_unsafe = False

    while True:
        try:
            code, email = display_util.input_text(invalid_prefix + msg if invalid else msg,
                                                  force_interactive=True)
        except errors.MissingCommandlineFlag:
            msg = ("You should register before running non-interactively, "
                   "or provide --agree-tos and --email <email_address> flags.")
            raise errors.MissingCommandlineFlag(msg)

        if code != display_util.OK:
            if optional:
                raise errors.Error(
                    "An e-mail address or "
                    "--register-unsafely-without-email must be provided.")
            raise errors.Error("An e-mail address must be provided.")
        if util.safe_email(email):
            return email
        if suggest_unsafe:
            msg = unsafe_suggestion + msg
            suggest_unsafe = False  # add this message at most once

        invalid = bool(email)


def choose_account(accounts):
    """Choose an account.

    :param list accounts: Containing at least one
        :class:`~certbot._internal.account.Account`

    """
    # Note this will get more complicated once we start recording authorizations
    labels = [acc.slug for acc in accounts]

    code, index = display_util.menu("Please choose an account", labels, force_interactive=True)
    if code == display_util.OK:
        return accounts[index]
    return None


def choose_values(values, question=None):
    """Display screen to let user pick one or multiple values from the provided
    list.

    :param list values: Values to select from

    :returns: List of selected values
    :rtype: list
    """
    code, items = display_util.checklist(question, tags=values, force_interactive=True)
    if code == display_util.OK and items:
        return items
    return []


def choose_names(installer, question=None):
    """Display screen to select domains to validate.

    :param installer: An installer object
    :type installer: :class:`certbot.interfaces.Installer`

    :param `str` question: Overriding default question to ask the user if asked
        to choose from domain names.

    :returns: List of selected names
    :rtype: `list` of `str`

    """
    if installer is None:
        logger.debug("No installer, picking names manually")
        return _choose_names_manually()

    domains = list(installer.get_all_names())
    names = get_valid_domains(domains)

    if not names:
        return _choose_names_manually()

    code, names = _filter_names(names, question)
    if code == display_util.OK and names:
        return names
    return []


def get_valid_domains(domains):
    """Helper method for choose_names that implements basic checks
     on domain names

    :param list domains: Domain names to validate
    :return: List of valid domains
    :rtype: list
    """
    valid_domains = []
    for domain in domains:
        try:
            valid_domains.append(util.enforce_domain_sanity(domain))
        except errors.ConfigurationError:
            continue
    return valid_domains


def _sort_names(FQDNs):
    """Sort FQDNs by SLD (and if many, by their subdomains)

    :param list FQDNs: list of domain names

    :returns: Sorted list of domain names
    :rtype: list
    """
    return sorted(FQDNs, key=lambda fqdn: fqdn.split('.')[::-1][1:])


def _filter_names(names, override_question=None):
    """Determine which names the user would like to select from a list.

    :param list names: domain names

    :returns: tuple of the form (`code`, `names`) where
        `code` - str display exit code
        `names` - list of names selected
    :rtype: tuple

    """
    # Sort by domain first, and then by subdomain
    sorted_names = _sort_names(names)
    if override_question:
        question = override_question
    else:
        question = "Which names would you like to activate HTTPS for?"
    code, names = display_util.checklist(
        question, tags=sorted_names, cli_flag="--domains", force_interactive=True)
    return code, [str(s) for s in names]


def _choose_names_manually(prompt_prefix=""):
    """Manually input names for those without an installer.

    :param str prompt_prefix: string to prepend to prompt for domains

    :returns: list of provided names
    :rtype: `list` of `str`

    """
    code, input_ = display_util.input_text(
        prompt_prefix +
        "Please enter the domain name(s) you would like on your certificate "
        "(comma and/or space separated)",
        cli_flag="--domains", force_interactive=True)

    if code == display_util.OK:
        invalid_domains = {}
        retry_message = ""
        try:
            domain_list = internal_display_util.separate_list_input(input_)
        except UnicodeEncodeError:
            domain_list = []
            retry_message = (
                "Internationalized domain names are not presently "
                "supported.{0}{0}Would you like to re-enter the "
                "names?{0}").format(os.linesep)

        for i, domain in enumerate(domain_list):
            try:
                domain_list[i] = util.enforce_domain_sanity(domain)
            except errors.ConfigurationError as e:
                invalid_domains[domain] = str(e)

        if invalid_domains:
            retry_message = (
                "One or more of the entered domain names was not valid:"
                "{0}{0}").format(os.linesep)
            for invalid_domain, err in invalid_domains.items():
                retry_message = retry_message + "{1}: {2}{0}".format(
                    os.linesep, invalid_domain, err)
            retry_message = retry_message + (
                "{0}Would you like to re-enter the names?{0}").format(
                    os.linesep)

        if retry_message:
            # We had error in input
            retry = display_util.yesno(retry_message, force_interactive=True)
            if retry:
                return _choose_names_manually()
        else:
            return domain_list
    return []


def success_installation(domains):
    """Display a box confirming the installation of HTTPS.

    :param list domains: domain names which were enabled

    """
    display_util.notify(
        "Congratulations! You have successfully enabled HTTPS on {0}"
        .format(_gen_https_names(domains))
    )


def success_renewal(unused_domains):
    """Display a box confirming the renewal of an existing certificate.

    :param list domains: domain names which were renewed

    """
    display_util.notify(
        "Your existing certificate has been successfully renewed, and the "
        "new certificate has been installed."
    )


def success_revocation(cert_path):
    """Display a message confirming a certificate has been revoked.

    :param list cert_path: path to certificate which was revoked.

    """
    display_util.notify(
        "Congratulations! You have successfully revoked the certificate "
        "that was located at {0}.".format(cert_path)
    )


def report_executed_command(command_name: str, returncode: int, stdout: str, stderr: str) -> None:
    """Display a message describing the success or failure of an executed process (e.g. hook).

    :param str command_name: Human-readable description of the executed command
    :param int returncode: The exit code of the executed command
    :param str stdout: The stdout output of the executed command
    :param str stderr: The stderr output of the executed command

    """
    out_s, err_s = stdout.strip(), stderr.strip()
    if returncode != 0:
        logger.warning("%s reported error code %d", command_name, returncode)
    if out_s:
        display_util.notify(f"{command_name} ran with output:\n{indent(out_s, ' ')}")
    if err_s:
        logger.warning("%s ran with error output:\n%s", command_name, indent(err_s, ' '))


def _gen_https_names(domains):
    """Returns a string of the https domains.

    Domains are formatted nicely with ``https://`` prepended to each.

    :param list domains: Each domain is a 'str'

    """
    if len(domains) == 1:
        return "https://{0}".format(domains[0])
    elif len(domains) == 2:
        return "https://{dom[0]} and https://{dom[1]}".format(dom=domains)
    elif len(domains) > 2:
        return "{0}{1}{2}".format(
            ", ".join("https://%s" % dom for dom in domains[:-1]),
            ", and https://",
            domains[-1])

    return ""


def _get_validated(method, validator, message, default=None, **kwargs):
    if default is not None:
        try:
            validator(default)
        except errors.Error as error:
            logger.debug('Encountered invalid default value "%s" when prompting for "%s"',
                         default,
                         message,
                         exc_info=True)
            raise AssertionError('Invalid default "{0}"'.format(default))

    while True:
        code, raw = method(message, default=default, **kwargs)
        if code == display_util.OK:
            try:
                validator(raw)
                return code, raw
            except errors.Error as error:
                logger.debug('Validator rejected "%s" when prompting for "%s"',
                             raw,
                             message,
                             exc_info=True)
                display_util.notification(str(error), pause=False)
        else:
            return code, raw


def validated_input(validator, *args, **kwargs):
    """Like `~certbot.display.util.input_text`, but with validation.

    :param callable validator: A method which will be called on the
        supplied input. If the method raises an `errors.Error`, its
        text will be displayed and the user will be re-prompted.
    :param list `*args`: Arguments to be passed to `~certbot.display.util.input_text`.
    :param dict `**kwargs`: Arguments to be passed to `~certbot.display.util.input_text`.
    :return: as `~certbot.display.util.input_text`
    :rtype: tuple
    """
    return _get_validated(display_util.input_text, validator, *args, **kwargs)


def validated_directory(validator, *args, **kwargs):
    """Like `~certbot.display.util.directory_select`, but with validation.

    :param callable validator: A method which will be called on the
        supplied input. If the method raises an `errors.Error`, its
        text will be displayed and the user will be re-prompted.
    :param list `*args`: Arguments to be passed to `~certbot.display.util.directory_select`.
    :param dict `**kwargs`: Arguments to be passed to
        `~certbot.display.util.directory_select`.
    :return: as `~certbot.display.util.directory_select`
    :rtype: tuple
    """
    return _get_validated(display_util.directory_select, validator, *args, **kwargs)
