import os
from contextlib import suppress
from urllib.parse import urlencode

import orjson
from django.conf import settings
from django.http import HttpRequest, HttpResponse
from django.shortcuts import redirect, render
from django.views.decorators.http import require_safe

from confirmation.models import Confirmation, confirmation_url
from zerver.actions.realm_settings import do_send_realm_reactivation_email
from zerver.actions.user_settings import do_change_user_delivery_email
from zerver.actions.users import change_user_is_active
from zerver.lib.email_notifications import enqueue_welcome_emails, send_account_registered_email
from zerver.lib.response import json_success
from zerver.lib.typed_endpoint import typed_endpoint
from zerver.models import Realm
from zerver.models.realms import get_realm
from zerver.models.streams import get_realm_stream
from zerver.models.users import get_user_by_delivery_email
from zerver.views.invite import INVITATION_LINK_VALIDITY_MINUTES
from zproject.email_backends import get_forward_address, set_forward_address

ZULIP_PATH = os.path.join(os.path.dirname(os.path.abspath(__file__)), "../../")


@typed_endpoint
def email_page(request: HttpRequest, *, forward_address: str | None = None) -> HttpResponse:
    if request.method == "POST":
        assert forward_address is not None
        set_forward_address(forward_address)
        return json_success(request)
    try:
        with open(settings.EMAIL_CONTENT_LOG_PATH, "r+") as f:
            content = f.read()
    except FileNotFoundError:
        content = ""
    return render(
        request,
        "zerver/development/email_log.html",
        {"log": content, "forward_address": get_forward_address()},
    )


def clear_emails(request: HttpRequest) -> HttpResponse:
    with suppress(FileNotFoundError):
        os.remove(settings.EMAIL_CONTENT_LOG_PATH)
    return redirect(email_page)


@require_safe
def generate_all_emails(request: HttpRequest) -> HttpResponse:
    # We import the Django test client inside the view function,
    # because it isn't needed in production elsewhere, and not
    # importing it saves ~50ms of unnecessary manage.py startup time.

    from django.test import Client

    client = Client()

    # write fake data for all variables
    registered_email = "hamlet@zulip.com"
    unregistered_email_1 = "new-person@zulip.com"
    unregistered_email_2 = "new-person-2@zulip.com"
    invite_expires_in_minutes = INVITATION_LINK_VALIDITY_MINUTES
    realm = get_realm("zulip")
    other_realm = Realm.objects.exclude(string_id="zulip").first()
    user = get_user_by_delivery_email(registered_email, realm)

    # Password reset emails
    # active account in realm
    result = client.post(
        "/accounts/password/reset/", {"email": registered_email}, HTTP_HOST=realm.host
    )
    assert result.status_code == 302
    # deactivated user
    change_user_is_active(user, False)
    result = client.post(
        "/accounts/password/reset/", {"email": registered_email}, HTTP_HOST=realm.host
    )
    assert result.status_code == 302
    change_user_is_active(user, True)
    # account on different realm
    assert other_realm is not None
    result = client.post(
        "/accounts/password/reset/", {"email": registered_email}, HTTP_HOST=other_realm.host
    )
    assert result.status_code == 302
    # no account anywhere
    result = client.post(
        "/accounts/password/reset/", {"email": unregistered_email_1}, HTTP_HOST=realm.host
    )
    assert result.status_code == 302

    # Confirm account email
    result = client.post("/accounts/home/", {"email": unregistered_email_1}, HTTP_HOST=realm.host)
    assert result.status_code == 302

    # Find account email
    result = client.post("/accounts/find/", {"emails": registered_email}, HTTP_HOST=realm.host)
    assert result.status_code == 200

    # New login email
    logged_in = client.login(dev_auth_username=registered_email, realm=realm)
    assert logged_in

    # New user invite and reminder emails
    stream = get_realm_stream("Denmark", user.realm.id)
    result = client.post(
        "/json/invites",
        {
            "invitee_emails": unregistered_email_2,
            "invite_expires_in_minutes": invite_expires_in_minutes,
            "stream_ids": orjson.dumps([stream.id]).decode(),
        },
        HTTP_HOST=realm.host,
    )
    assert result.status_code == 200

    # Verification for new email
    result = client.patch(
        "/json/settings",
        urlencode({"email": "hamlets-new@zulip.com"}),
        content_type="application/x-www-form-urlencoded",
        HTTP_HOST=realm.host,
    )
    assert result.status_code == 200

    # Email change successful
    key = Confirmation.objects.filter(type=Confirmation.EMAIL_CHANGE).latest("id").confirmation_key
    url = confirmation_url(key, realm, Confirmation.EMAIL_CHANGE)
    user_profile = get_user_by_delivery_email(registered_email, realm)
    result = client.get(url)
    assert result.status_code == 200

    # Reset the email value so we can run this again
    do_change_user_delivery_email(user_profile, registered_email, acting_user=None)

    # Initial email with new account information for normal user
    send_account_registered_email(user_profile)

    # Onboarding emails for normal user
    enqueue_welcome_emails(user_profile)

    # Initial email with new account information for admin user
    send_account_registered_email(get_user_by_delivery_email("iago@zulip.com", realm))

    # Onboarding emails for admin user
    enqueue_welcome_emails(get_user_by_delivery_email("iago@zulip.com", realm), realm_creation=True)

    # Realm reactivation email
    do_send_realm_reactivation_email(realm, acting_user=None)

    return redirect(email_page)