"""채팅(chat) 도메인 e2e 테스트 — init / messages(오프닝 seed) / send(협상 진행~종료).

실제 agent(9500) 대신, 결정론적 테스트 더블(_FakeAgentClient)을 FastAPI 의존성 오버라이드로 주입한다.
(프로덕션 코드에는 mock 이 없다 — 테스트 전용 double 이다.) 더블은 backend 가 매 턴 보내는
client_step(직전 봇 step)과 user_input 으로 단계를 진행한다.
dev negosium_db 를 그대로 쓰므로 전용 테스트 행만 시드/정리한다.
"""

import uuid

import bcrypt
import pytest
import pytest_asyncio
from sqlalchemy import text

from services.agent_client import AgentTurn, IAgentClient, get_agent_client
from services.chat_service import ChatService

TEST_LOGIN_ID = "pytest_chat_user"
TEST_PW = "pytest1234"
TEST_SUPPLIER_NAME = "파이테스트채팅공급사"
MARK = "PYTESTCHAT-"


def _parse_price(text_):
    if not text_:
        return None
    digits = "".join(ch for ch in text_ if ch.isdigit())
    return int(digits) if digits else None


class _FakeAgentClient(IAgentClient):
    """결정론적 테스트 더블. ctx.client_step(직전 봇 step)+user_input 으로 단계를 진행한다.

    플로우: (오프닝)서비스안내 → 협상품목안내 → 가격협상 → 가격제시 시 목표가 이하면 성공 종료.
    '포기'/'거부' 입력은 언제든 실패 종료.
    """

    async def chat(self, session_id, user_input, ctx) -> AgentTurn:
        sid = session_id or "fake-session"
        if user_input and ("포기" in user_input or "거부" in user_input):
            return AgentTurn(
                session_id=sid, step="협상종료", client_step="협상종료",
                script="협상이 종료되었습니다.", chat_end=True, outcome="failure",
            )
        if user_input is None:  # 오프닝(턴0) — 양쪽 공통
            return AgentTurn(session_id=sid, step="서비스안내", client_step="서비스안내",
                             script="협상에 참여해 주셔서 감사합니다. 시작하시겠어요?",
                             input_mode="confirm", input_options=["네, 시작할게요"])
        if ctx.rq_type == "재견적":
            return self._requote(sid, user_input, ctx)
        return self._renego(sid, user_input, ctx)

    def _renego(self, sid, user_input, ctx) -> AgentTurn:
        if ctx.client_step == "서비스안내":
            return AgentTurn(session_id=sid, step="협상품목안내", client_step="협상품목안내",
                             script="협상 품목을 확인해 주세요. 가격 협상을 진행할까요?",
                             input_mode="confirm", input_options=["가격 협상 진행"])
        if ctx.client_step == "협상품목안내":
            return AgentTurn(session_id=sid, step="가격협상", client_step="가격협상",
                             script="희망 공급가를 입력해 주세요.", input_mode="price")
        # 가격협상 단계: 목표가 이하면 합의 종료, 아니면 한 번 더 요청
        price = _parse_price(user_input)
        if price is not None and ctx.target_price and price <= ctx.target_price:
            return AgentTurn(session_id=sid, step="협상종료", client_step="협상종료",
                             script=f"제안하신 {price:,}원으로 합의되었습니다. 감사합니다.",
                             chat_end=True, outcome="success", indicator_value=99.0)
        return AgentTurn(session_id=sid, step="가격협상", client_step="가격협상",
                         script="조금 더 조정된 가격을 제안해 주시겠어요?", input_mode="price",
                         indicator_value=50.0)

    def _requote(self, sid, user_input, ctx) -> AgentTurn:
        # 서비스안내 → 가격제안 → 배송형태선택 → 가격협상_입력 → 결과안내(summaryCM)
        if ctx.client_step == "서비스안내":
            return AgentTurn(session_id=sid, step="가격제안", client_step="가격제안",
                             script="제시 목표가로 진행하시겠어요?", input_mode="yes_no",
                             input_options=["예", "아니오"])
        if ctx.client_step == "가격제안":
            return AgentTurn(session_id=sid, step="배송형태선택", client_step="배송형태선택",
                             script="배송형태를 선택해 주세요.", input_mode="delivery_type",
                             input_options=["협력사배송", "지정택배배송", "픽업배송"])
        if ctx.client_step == "배송형태선택":
            return AgentTurn(session_id=sid, step="가격협상_입력", client_step="가격협상_입력",
                             script="희망 공급가를 입력해 주세요.", input_mode="price")
        if ctx.client_step == "가격협상_입력":
            return AgentTurn(session_id=sid, step="결과안내", client_step="결과안내",
                             script="투찰 결과를 확인해 주세요.", input_mode="yes_no",
                             input_options=["투찰확정", "정보수정"])
        # 결과안내 "투찰확정" → 결과제출 → 협상종료
        return AgentTurn(session_id=sid, step="협상종료", client_step="협상종료",
                         script="투찰이 확정되었습니다. 감사합니다.",
                         chat_end=True, outcome="success")


@pytest.fixture(autouse=True)
def _fake_agent():
    """모든 chat 테스트에서 실제 agent 대신 결정론적 더블을 주입(의존성 오버라이드)."""
    from router.router import app

    app.dependency_overrides[get_agent_client] = lambda: _FakeAgentClient()
    yield
    app.dependency_overrides.pop(get_agent_client, None)


@pytest_asyncio.fixture
async def chat_seed(db_engine):
    """공급사 + 유저 + 세션 2건(본인: 협상중 P / 협상생성 C) + 1건(타 공급사 X) 시드."""
    supplier_id = uuid.uuid4()
    other_supplier_id = uuid.uuid4()
    pw_hash = bcrypt.hashpw(TEST_PW.encode("utf-8"), bcrypt.gensalt()).decode("utf-8")

    # (code, session.status, qt_type, 마감까지 h, quotation.status, 소속 공급사)
    specs = [
        ("P", 2, 1, 2, 2, supplier_id),        # 협상중   / 재협상 / +2h / 견적진행중
        ("C", 1, 1, 2, 1, supplier_id),        # 협상생성 / 재협상 / +2h / 견적생성
        ("X", 2, 1, 2, 2, other_supplier_id),  # 타 공급사 → 차단
        ("Q", 2, 2, 2, 2, supplier_id),        # 협상중   / 재견적 / +2h / 견적진행중
    ]
    sids, qids = {}, {}

    async def _cleanup(conn):
        await conn.execute(text(f"DELETE FROM negotiation.chats WHERE session_id IN (SELECT session_id FROM negotiation.sessions WHERE qt_number LIKE '{MARK}%')"))
        await conn.execute(text(f"DELETE FROM negotiation.sessions WHERE qt_number LIKE '{MARK}%'"))
        await conn.execute(text(f"DELETE FROM quotation.quotations WHERE number LIKE '{MARK}%'"))
        await conn.execute(text(f"DELETE FROM partner.items WHERE code LIKE '{MARK}%'"))
        await conn.execute(text("DELETE FROM supplier.supplier_users WHERE id = :id"), {"id": TEST_LOGIN_ID})
        await conn.execute(text("DELETE FROM partner.suppliers WHERE name = :n"), {"n": TEST_SUPPLIER_NAME})

    async with db_engine.begin() as conn:
        await _cleanup(conn)
        await conn.execute(
            text("INSERT INTO partner.suppliers (supplier_id, company_id, user_id, name) VALUES (:sid, gen_random_uuid(), gen_random_uuid(), :name)"),
            {"sid": supplier_id, "name": TEST_SUPPLIER_NAME},
        )
        await conn.execute(
            text(
                "INSERT INTO supplier.supplier_users (supplier_id, id, password, name, last_accessed_at, status, role) "
                "VALUES (:sid, :id, :pw, '채팅담당자', now(), 1, 1)"
            ),
            {"sid": supplier_id, "id": TEST_LOGIN_ID, "pw": pw_hash},
        )
        for code, sess_st, qt_type, hrs, quote_st, sup in specs:
            item_id, qt_id, session_id = uuid.uuid4(), uuid.uuid4(), uuid.uuid4()
            sids[code], qids[code] = session_id, qt_id
            await conn.execute(
                text(
                    "INSERT INTO partner.items (item_id, company_id, user_id, name, code, price, model_name, manufacturer, moq, spec) "
                    "VALUES (:iid, gen_random_uuid(), gen_random_uuid(), :name, :code, 100000, :model, '테스트제조사', '10', '규격A')"
                ),
                {"iid": item_id, "name": f"상품 {code}", "code": f"{MARK}{code}", "model": f"MODEL-{code}"},
            )
            await conn.execute(
                text(
                    "INSERT INTO quotation.quotations (qt_id, user_id, qt_setting_id, version_id, name, number, type, status, start_time, end_time, memo) "
                    "VALUES (:qid, gen_random_uuid(), gen_random_uuid(), gen_random_uuid(), :name, :num, :tp, :st, now(), now() + make_interval(hours => :hrs), '메모')"
                ),
                {"qid": qt_id, "name": f"견적 {code}", "num": f"{MARK}{code}", "tp": qt_type, "st": quote_st, "hrs": hrs},
            )
            await conn.execute(
                text(
                    "INSERT INTO negotiation.sessions "
                    "(session_id, quotation_id, item_id, supplier_id, qt_number, qt_round, qt_type, target_price, status, end_time) "
                    "VALUES (:sesid, :qid, :iid, :sup, :qtn, 1, :qtt, 100000, :st, now() + make_interval(hours => 2))"
                ),
                {"sesid": session_id, "qid": qt_id, "iid": item_id, "sup": sup, "qtn": f"{MARK}{code}", "qtt": qt_type, "st": sess_st},
            )

    yield {"supplier_id": supplier_id, "sids": sids, "qids": qids}

    async with db_engine.begin() as conn:
        await _cleanup(conn)


async def _login_token(client):
    r = await client.post("/v1/auth/login", json={"id": TEST_LOGIN_ID, "pw": TEST_PW})
    return r.json()["access_token"]


def _h(token):
    return {"Authorization": f"Bearer {token}"}


async def _init(client, token, sid):
    return await client.get(f"/v1/negotiation/sessions/{sid}/chat/init", headers=_h(token))


async def _messages(client, token, sid):
    return await client.get(f"/v1/negotiation/sessions/{sid}/chat/messages", headers=_h(token))


async def _send(client, token, sid, user_input, user_input_type=None):
    body = {"user_input": user_input, "user_input_type": user_input_type}
    return await client.post(f"/v1/negotiation/sessions/{sid}/chat/send", headers=_h(token), json=body)


async def _session_status(db_engine, session_id):
    async with db_engine.begin() as conn:
        return (await conn.execute(text("SELECT status FROM negotiation.sessions WHERE session_id = :sid"), {"sid": session_id})).scalar()


async def _session_bid(db_engine, session_id):
    async with db_engine.begin() as conn:
        return (await conn.execute(text("SELECT bid_price FROM negotiation.sessions WHERE session_id = :sid"), {"sid": session_id})).scalar()


async def _session_reject(db_engine, session_id):
    async with db_engine.begin() as conn:
        r = (await conn.execute(text("SELECT status, reject_reason FROM negotiation.sessions WHERE session_id = :sid"), {"sid": session_id})).first()
        return r[0], r[1]


# ---- init -------------------------------------------------------------------
async def test_chat_init_returns_meta(client, chat_seed):
    token = await _login_token(client)
    body = (await _init(client, token, chat_seed["sids"]["P"])).json()
    assert body["result"]["success"] is True
    assert body["session_status"] == 2
    assert body["item_name"] == "상품 P" and body["item_price"] == 100000
    assert body["item_maker_name"] == "테스트제조사"
    assert body["quotation_end_time"]  # 타이머용 마감 시각


async def test_chat_init_returns_reject_detail(client, chat_seed, db_engine):
    """검증: 협상 거부로 끝난 세션에 재진입('결과 보기')했을 때의 init 응답.
    기대결과: 대화에 남지 않는 제출 내역(reject_reason·reject_price)이 실려 열람 카드를 그릴 수 있다."""
    token = await _login_token(client)
    sid = chat_seed["sids"]["P"]
    await client.post(
        f"/v1/negotiation/sessions/{sid}/reject",
        headers={"Authorization": f"Bearer {token}"},
        json={"reject_reason": "단종", "reject_price": 91000, "opinion": "후속 모델로 제안 가능합니다"},
    )
    body = (await _init(client, token, sid)).json()
    assert body["session_status"] == 5
    assert body["reject_reason"] == "단종"
    assert body["reject_price"] == 91000
    assert body["custom"]["opinion"] == "후속 모델로 제안 가능합니다"


async def test_chat_init_forbidden_other_supplier(client, chat_seed):
    token = await _login_token(client)
    body = (await _init(client, token, chat_seed["sids"]["X"])).json()
    assert body["result"]["code"] == 1300  # NEGO_FORBIDDEN


async def test_chat_init_vat_mode_unified_shows_excluded(client, chat_seed, db_engine):
    """검증: 부가세 전체 통일 회사(features.vat_mode=unified_excluded)의 세션 채팅 init.
    기대결과: 상품에 vat_yn=true 잔존값이 있어도 item_vat_yn=False — 프론트가 'VAT별도'로 고정 표기."""
    import json

    company_id = uuid.uuid4()
    async with db_engine.begin() as conn:
        await conn.execute(
            text("INSERT INTO company.companies (company_id, name, status, settings) VALUES (:c, :n, 1, CAST(:s AS JSONB))"),
            {"c": company_id, "n": f"{MARK}VAT통일사", "s": json.dumps({"features": {"vat_mode": "unified_excluded"}})},
        )
        await conn.execute(
            text("UPDATE partner.suppliers SET company_id = :c WHERE supplier_id = :sid"),
            {"c": company_id, "sid": chat_seed["supplier_id"]},
        )
        await conn.execute(
            text("UPDATE partner.items SET vat_yn = true WHERE item_id = (SELECT item_id FROM negotiation.sessions WHERE session_id = :s)"),
            {"s": chat_seed["sids"]["P"]},
        )
    try:
        token = await _login_token(client)
        body = (await _init(client, token, chat_seed["sids"]["P"])).json()
        assert body["result"]["success"] is True
        assert body["item_vat_yn"] is False
    finally:
        async with db_engine.begin() as conn:
            await conn.execute(text("DELETE FROM company.companies WHERE company_id = :c"), {"c": company_id})


# ---- messages (오프닝 seed) -------------------------------------------------
async def test_messages_seeds_opening(client, chat_seed):
    token = await _login_token(client)
    body = (await _messages(client, token, chat_seed["sids"]["P"])).json()
    assert body["result"]["success"] is True
    assert len(body["items"]) == 1
    msg = body["items"][0]
    assert msg["sender"] == 1                      # ChatSender.BOT (봇)
    assert msg["next_input_mode"] == "confirm"
    assert msg["script"]


# ---- send (협상 진행 → 종료) ------------------------------------------------
async def test_send_flow_to_completion(client, chat_seed, db_engine):
    token = await _login_token(client)
    sid = chat_seed["sids"]["P"]

    await _messages(client, token, sid)  # 오프닝(턴0) seed

    r1 = (await _send(client, token, sid, "네, 시작할게요")).json()
    assert r1["result"]["success"] is True
    assert r1["message"]["next_input_mode"] == "confirm"   # 품목안내
    assert r1["session_status"] == 2

    r2 = (await _send(client, token, sid, "가격 협상 진행")).json()
    assert r2["message"]["next_input_mode"] == "price"      # 가격입력 요청

    r3 = (await _send(client, token, sid, "90000", user_input_type="price")).json()
    assert r3["result"]["success"] is True
    assert r3["message"]["chat_end"] is True
    assert r3["session_status"] == 3                        # 협상완료(DONE)
    assert await _session_status(db_engine, sid) == 3
    assert await _session_bid(db_engine, sid) == 90000      # 입찰가 확정


async def test_requote_summary_captures_delivery_type(client, chat_seed):
    """재견적: 배송형태선택에서 고른 값이 summaryCM 요약(delivery_type)에 담긴다."""
    token = await _login_token(client)
    sid = chat_seed["sids"]["Q"]
    await _messages(client, token, sid)              # 오프닝(서비스안내)
    await _send(client, token, sid, "네, 시작할게요")  # → 가격제안
    await _send(client, token, sid, "예")             # → 배송형태선택
    await _send(client, token, sid, "협력사배송")       # → 가격협상_입력
    r = (await _send(client, token, sid, "90000", user_input_type="price")).json()  # → 결과안내(summaryCM)
    assert r["result"]["success"] is True
    msg = r["message"]
    assert msg["bot_chat_type"] == "summaryCM"
    assert msg["summary"]["delivery_type"] == "협력사배송"


async def test_agent_provided_bot_chat_type_and_indicator_passthrough(client, chat_seed):
    """agent 가 bot_chat_type/indicator_value 를 직접 주면 backend 는 step 추측 없이 그대로 전달한다."""
    from router.router import app

    class _T(IAgentClient):
        async def chat(self, session_id, user_input, ctx):
            if user_input is None:
                return AgentTurn(session_id=session_id, step="서비스안내", client_step="서비스안내",
                                 script="안녕하세요", input_mode="confirm", input_options=["확인"])
            return AgentTurn(session_id=session_id, step="가격협상", client_step="가격협상",
                             script="지표를 확인하세요", input_mode="price",
                             indicator_value=55.0, bot_chat_type="indicator")

    app.dependency_overrides[get_agent_client] = lambda: _T()
    token = await _login_token(client)
    sid = chat_seed["sids"]["P"]
    await _messages(client, token, sid)                      # 오프닝
    r = (await _send(client, token, sid, "확인")).json()      # → 가격협상(indicator)
    assert r["result"]["success"] is True
    msg = r["message"]
    assert msg["bot_chat_type"] == "indicator"               # agent 값 그대로
    assert msg["indicator_value"] == 55.0                     # 지표 전달


async def test_send_price_out_of_range(client, chat_seed):
    token = await _login_token(client)
    sid = chat_seed["sids"]["P"]
    await _messages(client, token, sid)
    # 목표가 100000 → 허용 [30000, 170000]. 10 은 하한 미만.
    body = (await _send(client, token, sid, "10", user_input_type="price")).json()
    assert body["result"]["code"] == 1401  # CHAT_PRICE_OUT_OF_RANGE


async def test_send_not_in_progress(client, chat_seed):
    token = await _login_token(client)
    sid = chat_seed["sids"]["C"]  # 협상생성(미참여 전 단계)
    body = (await _send(client, token, sid, "네")).json()
    assert body["result"]["code"] == 1400  # CHAT_NOT_IN_PROGRESS


async def test_send_requires_auth(client, chat_seed):
    sid = chat_seed["sids"]["P"]
    r = await client.post(f"/v1/negotiation/sessions/{sid}/chat/send", json={"user_input": "네"})
    assert r.status_code in (401, 403)


# ---- 보완: 거부 저장 / 동시전송 가드 / init 만료 정리 ------------------------
async def test_send_rejection_persists_reason(client, chat_seed, db_engine):
    token = await _login_token(client)
    sid = chat_seed["sids"]["P"]
    await _messages(client, token, sid)  # 오프닝
    body = (await _send(client, token, sid, "협상 포기합니다")).json()
    assert body["result"]["success"] is True
    assert body["message"]["chat_end"] is True
    assert body["session_status"] == 5  # 협상거부(REJECTED)
    status, reason = await _session_reject(db_engine, sid)
    assert status == 5 and reason == "협상 포기합니다"  # 거부 사유 저장


async def test_send_blocked_when_prev_turn_pending(client, chat_seed, db_engine):
    """직전 메시지가 USER(이전 턴 처리 중)면 중복 전송을 거절한다 → CHAT_IN_PROGRESS."""
    token = await _login_token(client)
    sid = chat_seed["sids"]["P"]
    await _messages(client, token, sid)  # 오프닝(seq=1, BOT)
    # 봇 응답이 아직 안 온 상태를 모사: USER 메시지를 마지막(seq=2)으로 직접 삽입
    async with db_engine.begin() as conn:
        await conn.execute(
            text("INSERT INTO negotiation.chats (session_id, seq, sender, target_price) VALUES (:sid, 2, 2, 0)"),
            {"sid": sid},
        )
    body = (await _send(client, token, sid, "네")).json()
    assert body["result"]["code"] == 1403  # CHAT_IN_PROGRESS


async def test_init_marks_expired_created_as_not_participated(client, chat_seed, db_engine):
    """검증: 마감시간이 지난 협상생성 세션으로 채팅 진입.
    기대결과: DB 상태가 미참여(4)로 정리되고, init 자체는 열람용으로 성공한다."""
    token = await _login_token(client)
    sid, qid = chat_seed["sids"]["C"], chat_seed["qids"]["C"]  # 협상생성(1)
    async with db_engine.begin() as conn:
        await conn.execute(text("UPDATE quotation.quotations SET end_time = now() - make_interval(hours => 1) WHERE qt_id = :qid"), {"qid": qid})
    body = (await _init(client, token, sid)).json()
    assert body["result"]["success"] is True
    assert body["session_status"] == 4
    assert await _session_status(db_engine, sid) == 4  # DB 도 미참여로 전이


async def test_init_allows_viewing_rejected_session(client, chat_seed, db_engine):
    """검증: 협상거부(5)로 끝난 세션에 '결과 보기'로 재진입.
    기대결과: init 성공(열람 허용) — 대화 재개는 send 가 협상중만 허용해 막는다."""
    token = await _login_token(client)
    sid = chat_seed["sids"]["P"]
    async with db_engine.begin() as conn:
        await conn.execute(text("UPDATE negotiation.sessions SET status = 5 WHERE session_id = :sid"), {"sid": sid})  # 협상거부
    body = (await _init(client, token, sid)).json()
    assert body["result"]["success"] is True and body["session_status"] == 5
    assert (await _send(client, token, sid, "네")).json()["result"]["code"] == 1400  # CHAT_NOT_IN_PROGRESS


# ---- 순수 헬퍼 단위 테스트 (DB 불필요, ChatService @staticmethod) ----------
def test_parse_price():
    assert ChatService._parse_price("530,000원") == 530000  # 콤마/통화기호 제거
    assert ChatService._parse_price("abc") is None
    assert ChatService._parse_price("") is None
    assert ChatService._parse_price(None) is None


def test_in_price_range():
    assert ChatService._in_price_range(100000, 100000) is True
    assert ChatService._in_price_range(29000, 100000) is False   # floor(0.3) 미만
    assert ChatService._in_price_range(180000, 100000) is False  # ceil(1.7) 초과
    assert ChatService._in_price_range(50000, None) is True      # 목표가 없으면 양수면 통과
    assert ChatService._in_price_range(0, None) is False


def test_input_matches_mode():
    f = ChatService._input_matches_mode
    assert f(None, "x", "text") is True                          # 직전 메타 없음 → 제약 없음
    assert f({}, "x", "price") is True                           # input_mode 없음
    assert f({"input_mode": "price"}, "100", "price") is True
    assert f({"input_mode": "price"}, "예", "text") is False     # price 단계에 텍스트
    assert f({"input_mode": "percent"}, "5", "percent") is True
    assert f({"input_mode": "yes_no"}, "예", "text") is True
    assert f({"input_mode": "yes_no"}, "100", "price") is False  # 버튼 단계에 가격 숫자
    assert f({"input_mode": "delivery_type"}, "픽업", "text") is True


def test_resolve_bot_chat_type():
    f = ChatService._resolve_bot_chat_type
    assert f(1, "협상완료") == "summaryRSP"   # 재협상
    assert f(2, "협상완료") == "summaryCM"    # 재견적
    assert f(1, "협상실패") == "rejectRSP"
    assert f(2, "협상실패") == "rejectCM"
    assert f(2, "결과제출") == "summaryCM"
    assert f(1, "가격협상") is None           # 일반 step
    assert f(1, None) is None