"""Integration-style tests for Human Handoff → Customer RFC threading."""

from bson import ObjectId

from app.services.external_reply_service import (
    build_external_reply_plan,
    internet_message_id_of,
)
from app.services.mail_sender import build_message, sign_message
from types import SimpleNamespace


def test_handoff_bridge_first_reply_threads_against_customer_a():
    customer_a_id = "<CAHabc123@mail.gmail.com>"
    customer_a = {
        "_id": ObjectId(),
        "internet_message_id": customer_a_id,
        "message_id": customer_a_id,
        "message_scope": "EXTERNAL",
        "direction": "inbound",
        "references": [],
        "subject": "fresh test",
    }
    plan = build_external_reply_plan(
        parent_external_message=customer_a,
        body_text="human said B",
        recipients=["091rabbytes@gmail.com"],
    )
    assert plan.threading.in_reply_to == customer_a_id
    assert plan.threading.references == [customer_a_id]
    assert plan.threading.in_reply_to != "<H2@gmail.com>"
    assert "<H1@gentic.email>" not in plan.threading.references


def test_lowercased_stored_id_recovered_via_raw_headers():
    customer_a_id = "<CAHabc123@mail.gmail.com>"
    parent = {
        "_id": ObjectId(),
        "internet_message_id": "<cahabc123@mail.gmail.com>",
        "message_id": "<cahabc123@mail.gmail.com>",
        "raw_headers": {"message_id": customer_a_id},
        "references": [],
        "subject": "fresh test",
    }
    plan = build_external_reply_plan(
        parent_external_message=parent,
        body_text="human said B",
        recipients=["customer@gmail.com"],
        parent_internet_id_override=internet_message_id_of(parent),
    )
    assert plan.threading.in_reply_to == customer_a_id
    assert plan.threading.references == [customer_a_id]


def test_signed_mime_preserves_threading_headers():
    customer_a_id = "<CAHabc123@mail.gmail.com>"
    message = build_message(
        sender="suyash@gentic.email",
        recipients=["091rabbytes@gmail.com"],
        cc=[],
        subject="Re: fresh test",
        body_text="human said B",
        body_html=None,
        in_reply_to=customer_a_id,
        references=[customer_a_id],
        message_id="<B@gentic.email>",
    )
    domain = SimpleNamespace(
        domain_name="gentic.email",
        dkim_selector="agmail",
        dkim_private_key="private-key",
    )
    from unittest.mock import patch

    with patch(
        "app.services.mail_sender.dkim.sign",
        return_value=b"DKIM-Signature: test\r\n",
    ):
        signed = sign_message(message, domain)

    assert f"In-Reply-To: {customer_a_id}".encode() in signed
    assert f"References: {customer_a_id}".encode() in signed