"""Tests for the WeChat talker (conversation) list scraper (M2).

Drives the real page-number 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.

The fixture ships 3 conversations across 2 pages of size 2, plus a
terminating empty page (the page-number paginator's primary stop signal):

* page 1 -> 2 records, ``hasMore=true``
* page 2 -> 1 record, ``hasMore=false``
* page 3 -> empty ``page`` array (no more rows)

The scraper must yield exactly the 3 talkers (normalized), send the owning
``wechatId`` in every request body, advance ``pageNum``, and stop after the
empty page. Both the direct-message (``memberCount == 0``) and group-chat
(``memberCount > 0``) paths are exercised by the fixture.
"""

from __future__ import annotations

import json as _json

import httpx
import respx

from app.scraper.wechat import scrape_wechat_talkers
from app.session.yunke_client import YunkeClient
from tests.cassettes.talkerList_fixture import (
    DEFAULT_PAGE_SIZE,
    OWNER_WECHAT_ID,
    TALKER_RECORDS,
    make_talker_list_response,
)

BASE = "https://crm2.yunkecn.com"
TALKER_LIST_URL = f"{BASE}/wechatweb/wxFriends/talkerList"

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


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


# ---------------------------------------------------------------------------
# End-to-end: pagination + field mapping + wechatId in request body
# ---------------------------------------------------------------------------


@respx.mock
async def test_scrape_wechat_talkers_yields_records_and_paginates():
    """Two full pages + a terminating empty page -> 3 talkers, 3 calls."""
    page1 = make_talker_list_response(
        TALKER_RECORDS[:2], page_num=1, page_size=DEFAULT_PAGE_SIZE, has_more=True
    )
    page2 = make_talker_list_response(
        TALKER_RECORDS[2:], page_num=2, page_size=DEFAULT_PAGE_SIZE, has_more=False
    )
    page3 = make_talker_list_response([], page_num=3, page_size=DEFAULT_PAGE_SIZE)

    route = respx.post(TALKER_LIST_URL).mock(
        side_effect=[
            httpx.Response(200, json=page1),
            httpx.Response(200, json=page2),
            httpx.Response(200, json=page3),
        ]
    )

    client = _primed_client()
    try:
        results = [
            r
            async for r in scrape_wechat_talkers(
                client, OWNER_WECHAT_ID, page_size=DEFAULT_PAGE_SIZE
            )
        ]
    finally:
        await client.aclose()

    # Pagination: exactly 3 calls (page1, page2, empty-page stop).
    assert route.call_count == 3

    # Exactly the 3 fixture talkers (not duplicated, not dropped).
    assert len(results) == 3
    assert {r["friend_wechat_id"] for r in results} == {
        rec["friendWechatId"] for rec in TALKER_RECORDS
    }

    # Field mapping for each record (compare against the source record).
    for result, record in zip(results, TALKER_RECORDS, strict=True):
        assert result["friend_wechat_id"] == record["friendWechatId"]
        assert result["nick_name"] == record["nickName"]
        assert result["remark_name"] == record["remarkName"]
        assert result["message_count"] == record["messageCount"]
        assert result["last_chat_time"] == record["lastChatTime"]
        assert result["member_count"] == record["memberCount"]
        assert result["head_url"] == record["headUrl"]
        # The owning staff account is carried on every record.
        assert result["owner_account_id"] == OWNER_WECHAT_ID
        # raw_json preserves the original upstream record.
        assert result["raw_json"] == record


@respx.mock
async def test_scrape_wechat_talkers_sends_wechat_id_and_pagination_body():
    """Every request carries the staff wechatId + advancing pageNum/pageSize."""
    page1 = make_talker_list_response(
        TALKER_RECORDS[:1], page_num=1, page_size=1, has_more=True
    )
    page2 = make_talker_list_response(
        [], page_num=2, page_size=1, has_more=False
    )
    route = respx.post(TALKER_LIST_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_wechat_talkers(client, OWNER_WECHAT_ID, page_size=1)
        ]
    finally:
        await client.aclose()

    # One record on page 1, empty page 2 stops the loop.
    assert len(results) == 1
    assert route.call_count == 2

    # Both requests must carry the owning wechatId + page slice.
    body1 = _json.loads(route.calls[0].request.content.decode())
    assert body1["wechatId"] == OWNER_WECHAT_ID
    assert body1["pageNum"] == 1
    assert body1["pageSize"] == 1

    body2 = _json.loads(route.calls[1].request.content.decode())
    assert body2["wechatId"] == OWNER_WECHAT_ID
    assert body2["pageNum"] == 2
    assert body2["pageSize"] == 1


# ---------------------------------------------------------------------------
# Empty first page -> no yields, single call
# ---------------------------------------------------------------------------


@respx.mock
async def test_scrape_wechat_talkers_stops_on_empty_first_page():
    """If the very first page is empty, scraper stops without over-fetching."""
    empty = make_talker_list_response([], page_num=1)
    route = respx.post(TALKER_LIST_URL).mock(
        return_value=httpx.Response(200, json=empty)
    )

    client = _primed_client()
    try:
        results = [r async for r in scrape_wechat_talkers(client, OWNER_WECHAT_ID)]
    finally:
        await client.aclose()

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