"""An undelivered email leaves a trace in the admins' inbox.

Sending is deliberately fail-soft — a missing SMTP setting or a rejecting relay logs and returns
False so nothing user-facing breaks. The cost of that used to be total silence: an instance whose
SMTP was never filled in swallowed verification links, password resets and access-request notices,
and the operator's first clue was somebody saying nothing arrived.
"""

import smtplib

import pytest
from sqlalchemy import select

from app import email as email_mod
from app.models import Notification


@pytest.fixture(autouse=True)
def _no_smtp_config(monkeypatch):
    """Every test here drives the real `_send`, so make sure it never reaches a socket."""
    monkeypatch.setattr(
        email_mod,
        "_smtp",
        lambda: {"host": "", "port": 587, "user": "", "password": "", "from": ""},
    )


def _notifications(db, user_id: int) -> list[Notification]:
    return list(
        db.execute(
            select(Notification)
            .where(Notification.user_id == user_id, Notification.type == "email_undelivered")
            .order_by(Notification.id)
        )
        .scalars()
        .all()
    )


def test_a_skipped_email_notifies_every_admin(db, make_user):
    admin_a = make_user(email="admin-a@example.com", role="admin")
    admin_b = make_user(email="admin-b@example.com", role="admin")
    plain = make_user(email="plain@example.com")

    assert email_mod.send_test("someone@example.com", "en") is False  # fail-soft, as before

    db.expire_all()
    for admin in (admin_a, admin_b):
        (n,) = _notifications(db, admin.id)
        assert n.data["reason"] == "not_configured"
        assert n.data["subject"] == "Siftlode SMTP test"
        assert n.data["recipients"] == ["someone@example.com"]
    assert _notifications(db, plain.id) == []  # not an operator's problem to see


def test_the_notice_is_throttled_so_a_dead_relay_cannot_flood_the_inbox(db, make_user):
    admin = make_user(email="admin@example.com", role="admin")

    for _ in range(5):
        email_mod.send_test("someone@example.com", "en")

    db.expire_all()
    assert len(_notifications(db, admin.id)) == 1


def test_a_send_failure_is_reported_separately_from_a_missing_config(db, make_user, monkeypatch):
    # A configured-but-rejecting relay is a different operator problem from an empty config, and the
    # inbox copy differs — so the reason has to survive to the notification.
    admin = make_user(email="admin@example.com", role="admin")
    monkeypatch.setattr(
        email_mod,
        "_smtp",
        lambda: {
            "host": "smtp.example.com",
            "port": 587,
            "user": "u",
            "password": "p",
            "from": "Siftlode <u@example.com>",
        },
    )

    def _boom(*a, **kw):
        raise smtplib.SMTPException("nope")

    monkeypatch.setattr(email_mod.smtplib, "SMTP", _boom)

    assert email_mod.send_test("someone@example.com", "en") is False

    db.expire_all()
    (n,) = _notifications(db, admin.id)
    assert n.data["reason"] == "send_failed"


def test_no_admins_means_no_notification_and_no_error(db, make_user):
    # A fresh instance can have no admin yet (the wizard has not run). The alert must stay silent
    # rather than blowing up inside the fail-soft path it is supposed to make visible.
    plain = make_user(email="plain@example.com")

    assert email_mod.send_test("someone@example.com", "en") is False

    db.expire_all()
    assert _notifications(db, plain.id) == []


def test_a_drop_with_nobody_to_tell_does_not_burn_the_hour(db, make_user):
    # The throttle window must only be spent on a notice that was actually written. Otherwise a drop
    # during setup — before any admin exists — silences the next hour for the admin created a minute
    # later, which is exactly the blind spot this alert exists to remove.
    email_mod.send_test("someone@example.com", "en")  # no admins yet
    admin = make_user(email="admin@example.com", role="admin")

    assert email_mod.send_test("someone@example.com", "en") is False

    db.expire_all()
    assert len(_notifications(db, admin.id)) == 1


def test_a_failed_alert_does_not_burn_the_hour_either(db, make_user, monkeypatch):
    admin = make_user(email="admin@example.com", role="admin")
    boom = {"on": True}

    def _maybe_boom(*a, **kw):
        if boom["on"]:
            raise RuntimeError("notification store is down")
        from app.notifications import create_notification as real

        return real(*a, **kw)

    monkeypatch.setattr(email_mod, "create_notification", _maybe_boom)
    email_mod.send_test("someone@example.com", "en")  # the write blows up; nothing recorded
    boom["on"] = False

    assert email_mod.send_test("someone@example.com", "en") is False

    db.expire_all()
    assert len(_notifications(db, admin.id)) == 1


def test_a_broken_alert_never_breaks_the_send(db, make_user, monkeypatch):
    # The alert is the fallback path; if IT fails, the caller must still get the ordinary fail-soft
    # False rather than an exception surfacing from a background task.
    make_user(email="admin@example.com", role="admin")

    def _boom(*a, **kw):
        raise RuntimeError("notification store is down")

    monkeypatch.setattr(email_mod, "create_notification", _boom)

    assert email_mod.send_test("someone@example.com", "en") is False