import asyncio
import random
import re
import string

from django.conf import settings

from udm_rest_client.exceptions import NoObject, UdmError
from udm_rest_client.udm import UDM

from membershipworks.models import Flag, Member

USER_BASE = "cn=users,dc=sawtooth,dc=claremontmakerspace,dc=org"
GROUP_BASE = "cn=groups,dc=sawtooth,dc=claremontmakerspace,dc=org"
RAND_PW_LEN = 20

GROUPS_REGEX = "|".join(
    ["Certified: .*", "Access .*\\?", "CMS .*", "Volunteer: .*", "Database .*"]
)


# From an API error message:
#   A group name must start and end with a letter, number or underscore.
#   In between additionally spaces, dashes and dots are allowed.
def sanitize_group_name(name):
    sanitized_body = re.sub(r"[^0-9A-Za-z_ -.]+", ".", name)
    sanitized_start_end = re.sub("^[^0-9A-Za-z_]|[^0-9A-Za-z_]$", "_", sanitized_body)

    return "MW_" + sanitized_start_end


# From an API error message: "Username must only contain numbers, letters and dots!"
def sanitize_user_name(name):
    return re.sub(r"[^0-9a-z.]+", ".", name.lower()).strip(".")


async def make_groups(udm):
    group_mod = udm.get("groups/group")
    existing_groups = {g.props.name async for g in group_mod.search()}

    flag_groups = {
        sanitize_group_name(flag.name)
        async for flag in Flag.objects.filter(
            type__in=["label", "folder"], name__regex=GROUPS_REGEX
        )
    }

    missing_groups = flag_groups - existing_groups
    print(f"Creating missing groups: {missing_groups}")
    for group_name in missing_groups:
        group = await group_mod.new()
        group.props.name = group_name
        await group.save()


async def sync_member(user_mod, member: Member):
    username = sanitize_user_name(member.account_name)

    try:  # try to get an existing user to update
        user = await user_mod.get(f"uid={username},{USER_BASE}")
    except NoObject:  # create a new user
        print("Creating new user {username}")
        # TODO: search by employeeNumber and rename users when needed
        user = await user_mod.new()

        # set a random password and ensure it is changed at next login
        user.props.password = "".join(
            random.choice(string.ascii_letters + string.digits)
            for x in range(0, RAND_PW_LEN)
        )
        user.props.pwdChangeNextLogin = True

    user.props.update(
        {
            "title": "",  # Title
            "firstname": member.first_name,
            "lastname": member.last_name,  # (c)
            "username": username,  # (cmr)
            "description": "",  # Description
            # "password": "", # (c) Password
            # "mailPrimaryAddress": member["Email"], # Primary e-mail address
            # "displayName": "", # Display name
            # "birthday": "", # Birthdate
            # "jpegPhoto": "", # Picture of the user (JPEG format)
            "employeeNumber": member.uid,
            # "employeeType": "", # Employee type
            "homedrive": "H:",  # Windows home drive
            "sambahome": f"\\\\ucs\\{username}",  # Windows home path
            "profilepath": "%LOGONSERVER%\\%USERNAME%\\windows-profiles\\default",  # Windows profile directory
            "disabled": not member.is_active,
            # "userexpiry": member["Renewal Date"],
            # "pwdChangeNextLogin": "1", # User has to change password on next login
            # "sambaLogonHours": "", # Permitted times for Windows logins
            "phone": [member.phone],  # Telephone number
            # "PasswordRecoveryMobile": member["Phone"], # Mobile phone number
        }
    )

    if member.email:
        user.props["e-mail"] = [member.email]  # ([]) E-mail address
        user.props["PasswordRecoveryEmail"] = member.email

    new_groups = [
        f"cn={sanitize_group_name(flag.name)},{GROUP_BASE}"
        async for flag in member.flags.filter(
            type__in=["label", "folder"], name__regex=GROUPS_REGEX
        )
    ]
    # groups not from this script
    other_old_groups = [g for g in user.props.groups if not g[3:].startswith("MW_")]
    user.props.groups = other_old_groups + new_groups

    try:
        await user.save()
    except UdmError:
        print("Failed to save user", username)
        print(user.props)
        raise


async def async_accounts():
    async with UDM(**settings.UCS) as udm:
        print("Syncing groups")
        await make_groups(udm)

        print("Syncing members")
        user_mod = udm.get("users/user")
        async for member in Member.objects.with_is_active().filter(
            Member.objects.has_flag("folder", "Members")
            | Member.objects.has_flag("folder", "CMS Staff")
        ):
            await sync_member(user_mod, member)


def sync_accounts():
    asyncio.run(async_accounts())