"""Tests for the WhatsApp message scraper (M3).

Drives the real backward-cursor pagination + normalization logic through
``respx`` by wiring a real ``YunkeClient`` (primed with a fake session so the
login flow is skipped) against a mocked transport. Two pages are served:

* page 1 -> ``messages=[m1, m_datebar(-2), m2]``, ``end=E1``, ``hasLast=true``
* page 2 -> ``messages=[m3]``, ``end=E2``, ``hasLast=false``

The scraper must yield exactly ``[m1, m2, m3]`` (the ``-2`` divider dropped),
map fields per the live-capture names, set ``channel="whatsapp"``, send a
**JSON** body (``uid``/``friendUid``/``start``/``end``), AND the 2nd request
body's ``end`` must equal ``E1 - 1`` (proving the backward cursor advances by
one ms).
"""

from __future__ import annotations

import json as _json
from typing import Any

import httpx
import respx

from app.scraper.whatsapp import scrape_whatsapp_messages
from app.session.yunke_client import YunkeClient
from tests.cassettes.wa_messages_fixture import (
    E1,
    E2,
    WA_MESSAGE_RECORDS_PAGE1,
    WA_MESSAGE_RECORDS_PAGE2,
    make_wa_messages_response,
)

BASE = "https://crm2.yunkecn.com"
WA_MESSAGES_URL = f"{BASE}/qqweb/WhatsAppUser/chatRecords"

USERID = "a" * 32
COMPANY = "8m0atd"

UID = "8613800000001@s.whatsapp.net"
FRIEND_UID = "8613800000111@s.whatsapp.net"
START = 1
END = 1784518000000  # the initial upper-bound cursor


def _primed_client() -> YunkeClient:
    """A YunkeClient already in a logged-in state (login flow skipped)."""
    return YunkeClient(base_url=BASE, userid=USERID, company=COMPANY)


def _json_body(sent: httpx.Request) -> dict[str, Any]:
    """Parse the JSON body of an outgoing request into a dict."""
    return _json.loads(sent.content.decode())


# ---------------------------------------------------------------------------
# Test A: end-to-end backward-cursor pagination + divider drop + field mapping
# ---------------------------------------------------------------------------


@respx.mock
async def test_scrape_whatsapp_messages_drops_divider_and_paginates_backward():
    page1 = make_wa_messages_response(
        WA_MESSAGE_RECORDS_PAGE1, end=E1, has_last=True, trace_id="trace-wa-1"
    )
    page2 = make_wa_messages_response(
        WA_MESSAGE_RECORDS_PAGE2, end=E2, has_last=False, trace_id="trace-wa-2"
    )

    route = respx.post(WA_MESSAGES_URL).mock(
        side_effect=[
            httpx.Response(200, json=page1),
            httpx.Response(200, json=page2),
        ]
    )

    client = _primed_client()
    try:
        results = [
            r
            async for r in scrape_whatsapp_messages(
                client, UID, FRIEND_UID, START, END
            )
        ]
    finally:
        await client.aclose()

    # --- Exactly 2 calls: hasLast=false on page 2 means no 3rd fetch. ---
    assert route.call_count == 2

    # --- Exactly [m1, m2, m3] yielded (the -2 divider dropped). ---
    assert [r["msg_id"] for r in results] == ["wa_1000001", "wa_1000002", "wa_999999"]
    assert len(results) == 3

    r1, r2, r3 = results

    # m1 — text / incoming.
    assert r1["msg_id"] == "wa_1000001"
    assert r1["channel"] == "whatsapp"
    assert r1["owner_account_id"] == UID
    assert r1["talker_id"] == FRIEND_UID
    assert r1["is_send"] == 0
    assert r1["type"] == "text"            # code 0 -> text (phase0 §3)
    assert r1["type_raw"] == 0             # original raw code preserved
    assert r1["text"] == "hello from whatsapp"
    assert r1["timestamp"] == E1 + 600000
    assert r1["sender_name"] == "Customer One"
    assert r1["raw_json"] == WA_MESSAGE_RECORDS_PAGE1[0]

    # m2 — image / outgoing / media filename (deferred download, not a URL).
    assert r2["msg_id"] == "wa_1000002"
    assert r2["is_send"] == 1
    assert r2["type"] == "image"           # code 1 -> image/media (phase0 §3)
    assert r2["type_raw"] == 1
    assert r2["text"] == "[image]"
    assert r2["file_url"] == "8613800000001@s.whatsapp.net_wa_1000002.jpg"
    assert r2["raw_json"] == WA_MESSAGE_RECORDS_PAGE1[2]

    # m3 — text / incoming / quoted reply.
    assert r3["msg_id"] == "wa_999999"
    assert r3["type"] == "text"
    assert r3["type_raw"] == 0
    assert r3["text"] == "replying to an earlier message"
    assert r3["refer_msg"] == {
        "quotedId": "wa_888888",
        "quotedMessage": "the earlier message text",
    }
    assert r3["raw_json"] == WA_MESSAGE_RECORDS_PAGE2[0]

    # --- Backward cursor advance: 2nd request body's end == E1 - 1. ---
    first_req = route.calls[0].request
    second_req = route.calls[1].request

    body1 = _json_body(first_req)
    body2 = _json_body(second_req)

    assert body1["end"] == END
    assert body2["end"] == E1 - 1

    # --- JSON body is actually sent (NOT form-encoded). ---
    assert first_req.headers["content-type"] == "application/json"
    assert body1["uid"] == UID
    assert body1["friendUid"] == FRIEND_UID
    assert body1["start"] == START
    assert body1["end"] == END
    # ``start`` is constant across pages (only ``end`` walks backward).
    assert body2["start"] == START
    assert body2["uid"] == UID
    assert body2["friendUid"] == FRIEND_UID


# ---------------------------------------------------------------------------
# Test B: hasLast=false on first page -> stop after one call
# ---------------------------------------------------------------------------


@respx.mock
async def test_scrape_whatsapp_messages_stops_when_has_last_false_on_first_page():
    """A single page with hasLast=false: scraper yields the records and stops."""
    page = make_wa_messages_response(
        [WA_MESSAGE_RECORDS_PAGE2[0]], end=E2, has_last=False
    )
    route = respx.post(WA_MESSAGES_URL).mock(
        return_value=httpx.Response(200, json=page)
    )

    client = _primed_client()
    try:
        results = [
            r
            async for r in scrape_whatsapp_messages(
                client, UID, FRIEND_UID, START, END
            )
        ]
    finally:
        await client.aclose()

    assert [r["msg_id"] for r in results] == ["wa_999999"]
    assert route.call_count == 1


# ---------------------------------------------------------------------------
# Test C: empty messages array on the first page -> stop without a 3rd fetch
# ---------------------------------------------------------------------------


@respx.mock
async def test_scrape_whatsapp_messages_empty_first_page_yields_nothing():
    """An empty messages array is a defensive stop signal — no rows, one call."""
    page = make_wa_messages_response([], end=E1, has_last=True)
    route = respx.post(WA_MESSAGES_URL).mock(
        return_value=httpx.Response(200, json=page)
    )

    client = _primed_client()
    try:
        results = [
            r
            async for r in scrape_whatsapp_messages(
                client, UID, FRIEND_UID, START, END
            )
        ]
    finally:
        await client.aclose()

    assert results == []
    assert route.call_count == 1