"""报告域端到端（T-P3-07/09）：触发→配额→流水线→失败退款→重生成。

Fake 阶段定义在本文件里，通过 ``REPORT_PIPELINE_STAGES_JSON`` 让
assemble_stages 按 dotted path 动态装配——与 T16/T17 的真实阶段走完全相同
的装配路径。不启真 celery：worker 内芯函数直调；API 投递钩子替换为 no-op，
避免测试消息进真 Redis 队列被开发环境的 worker 消费掉。
"""

from __future__ import annotations

import json
import os
import uuid
from collections.abc import AsyncIterator, Iterator
from contextlib import contextmanager
from typing import Any

import pytest


def _infra_available() -> bool:
    return bool(os.getenv("MEIDA_RUN_INTEGRATION"))


pytestmark = [
    pytest.mark.integration,
    pytest.mark.skipif(
        not _infra_available(),
        reason="set MEIDA_RUN_INTEGRATION=1 with PostgreSQL and Redis running",
    ),
]

# Fake 阶段走 importlib 动态装配，dotted path 必须可导入（本文件自身）。
_MODULE = "tests.integration.test_report_flow"
_SUCCESS_STAGES = json.dumps([f"{_MODULE}:FakeVisionStage", f"{_MODULE}:FakeDiagnosisStage"])
_FAILING_STAGES = json.dumps([f"{_MODULE}:FakeVisionStage", f"{_MODULE}:FakeBoomStage"])


class FakeVisionStage:
    """视觉阶段替身：计算次数写进 derived_features，用例据此断言「已存在即跳过」。"""

    name = "vision"

    async def run(self, ctx: Any) -> None:
        features = ctx.report_input.derived_features
        if not features:
            # 与 T16 真实视觉阶段同一契约（T-P3-09）：中间态非空则不重算。
            features["vision_runs"] = 1
        ctx.report.result["vision"] = {"features": sorted(features)}


class FakeDiagnosisStage:
    name = "diagnosis"

    async def run(self, ctx: Any) -> None:
        # 顺序契约：诊断能读到视觉阶段的产物。
        assert "vision" in ctx.report.result
        ctx.report.result["diagnosis"] = {"summary": "肩宽腰细", "source": "vision"}


class FakeBoomStage:
    name = "boom"

    async def run(self, ctx: Any) -> None:
        raise RuntimeError("爆了：模拟阶段失败")


# --- fixtures ---------------------------------------------------------------


@pytest.fixture
def no_enqueue(monkeypatch: pytest.MonkeyPatch) -> None:
    """不向真 Redis 投递：worker 由用例直调（celery 注册/消费不在本用例范围）。"""
    monkeypatch.setattr("apps.api.routers.reports._enqueue_report", lambda task_id: None)


@contextmanager
def _stage_config(monkeypatch: pytest.MonkeyPatch, payload: str) -> Iterator[None]:
    """把阶段配置换成 Fake 阶段（setenv + cache_clear，结束时恢复）。

    API 进程与 worker 内芯读的是同一个 get_settings 单例，cache_clear 之后
    两边都会按 env 重建。
    """
    from packages.shared.config import get_settings

    monkeypatch.setenv("REPORT_PIPELINE_STAGES_JSON", payload)
    get_settings.cache_clear()
    try:
        yield
    finally:
        monkeypatch.undo()
        get_settings.cache_clear()


@pytest.fixture
def fake_stages(monkeypatch: pytest.MonkeyPatch) -> Iterator[None]:
    with _stage_config(monkeypatch, _SUCCESS_STAGES):
        yield


@pytest.fixture
def failing_stages(monkeypatch: pytest.MonkeyPatch) -> Iterator[None]:
    with _stage_config(monkeypatch, _FAILING_STAGES):
        yield


@pytest.fixture
async def client(no_enqueue: None) -> AsyncIterator[Any]:
    import httpx

    from apps.api.main import create_app
    from packages.shared.config import get_settings

    app = create_app(get_settings())
    transport = httpx.ASGITransport(app=app)
    async with (
        httpx.AsyncClient(transport=transport, base_url="http://test") as http,
        app.router.lifespan_context(app),
    ):
        yield http


# --- helpers ----------------------------------------------------------------


async def _login(client: Any) -> tuple[dict[str, str], int]:
    """dev-token：每个用例独立 device_key，拿到的就是全新用户。"""
    resp = await client.post(
        "/api/v1/auth/dev-token", json={"device_key": f"report-it-{uuid.uuid4().hex[:8]}"}
    )
    assert resp.json()["code"] == 0
    data = resp.json()["data"]
    return {"Authorization": f"Bearer {data['access_token']}"}, int(data["user_id"])


async def _create_report(
    client: Any, headers: dict[str, str], *, request_key: str | None = None
) -> dict[str, Any]:
    resp = await client.post(
        "/api/v1/reports",
        headers=headers,
        json={
            "questionnaire": {"style": "通勤", "height_cm": 168},
            "photo_object_key": "report_photo/u1.jpg",
            "request_key": request_key or f"rk-{uuid.uuid4().hex}",
        },
    )
    assert resp.status_code == 200
    body = resp.json()["data"]
    assert body["status"] == "pending"
    return body


async def _fetch_one(statement: Any) -> Any:
    from packages.shared.db import session_scope

    async with session_scope() as session:
        result = await session.execute(statement)
        return result.scalar_one_or_none()


async def _fetch_report(report_id: int) -> Any:
    from sqlalchemy import select

    from packages.shared.models import RpReport

    return await _fetch_one(select(RpReport).where(RpReport.report_id == report_id))


async def _fetch_input(report_id: int) -> Any:
    from sqlalchemy import select

    from packages.shared.models import RpInput

    return await _fetch_one(select(RpInput).where(RpInput.report_id == report_id))


async def _fetch_task(task_id: int) -> Any:
    from packages.shared.db import session_scope
    from packages.task import repo as task_repo

    async with session_scope() as session:
        task = await task_repo.get(session, task_id)
        assert task is not None
        # 脱离会话前把要断言的 JSONB 读出来（expire_on_commit=False，够用）。
        return task


async def _ledger_rows(user_id: int, quota_key: str) -> list[Any]:
    from sqlalchemy import select

    from packages.shared.db import session_scope
    from packages.shared.models import Ledger

    async with session_scope() as session:
        result = await session.execute(
            select(Ledger)
            .where(Ledger.user_id == user_id, Ledger.quota_key == quota_key)
            .order_by(Ledger.created_at.asc(), Ledger.tx_id.asc())
        )
        return list(result.scalars().all())


# --- 场景 1：触发与预扣 -------------------------------------------------------


async def test_create_reserves_lifetime_quota_and_creates_pending_task(
    fake_stages: None, client: Any
) -> None:
    headers, user_id = await _login(client)

    data = await _create_report(client, headers)
    task_id, report_id = int(data["task_id"]), int(data["report_id"])
    assert data["version"] == 1

    task = await _fetch_task(task_id)
    assert task.status == "pending"
    assert task.task_type == "report"
    assert task.payload["report_id"] == str(report_id)
    assert task.quota_reserved == 1
    assert task.reserve_tx_id is not None

    report = await _fetch_report(report_id)
    assert report.status == "pending"
    rp_input = await _fetch_input(report_id)
    assert rp_input.photo_meta == {"object_key": "report_photo/u1.jpg"}
    assert rp_input.derived_features == {}

    rows = await _ledger_rows(user_id, "report_basic")
    assert len(rows) == 1
    assert rows[0].tx_type == "consume"
    assert rows[0].status == "reserved"
    assert rows[0].period_key == "life"  # report_basic 是终身配额（迁移 0003）


# --- 场景 2：worker 成功 ------------------------------------------------------


async def test_worker_success_commits_quota_and_writes_stage_keys(
    fake_stages: None, client: Any
) -> None:
    from apps.worker.report_tasks import _generate_report

    headers, user_id = await _login(client)
    data = await _create_report(client, headers)
    task_id, report_id = int(data["task_id"]), int(data["report_id"])

    result = await _generate_report(task_id)
    assert result["status"] == "succeeded"

    report = await _fetch_report(report_id)
    assert report.status == "succeeded"
    assert report.completed_at is not None
    assert set(report.result) == {"vision", "diagnosis"}
    assert report.result["vision"] == {"features": ["vision_runs"]}
    assert "stages" in report.model_info

    task = await _fetch_task(task_id)
    assert task.status == "succeeded"
    assert task.progress == 100

    rows = await _ledger_rows(user_id, "report_basic")
    assert [row.status for row in rows] == ["committed"]

    # 列表与详情视图透出同样的产物。
    listing = (await client.get("/api/v1/reports", headers=headers)).json()["data"]
    assert [item["report_id"] for item in listing] == [str(report_id)]
    assert listing[0]["result"]["diagnosis"]["summary"] == "肩宽腰细"


# --- 场景 3：幂等重提交 -------------------------------------------------------


async def test_duplicate_request_key_returns_same_task_without_second_reserve(
    fake_stages: None, client: Any
) -> None:
    from apps.worker.report_tasks import _generate_report

    headers, user_id = await _login(client)
    request_key = f"rk-{uuid.uuid4().hex}"
    first = await _create_report(client, headers, request_key=request_key)
    await _generate_report(int(first["task_id"]))  # 先让首单成功

    again = await client.post(
        "/api/v1/reports",
        headers=headers,
        json={
            "questionnaire": {"style": "通勤"},
            "photo_object_key": "report_photo/u1.jpg",
            "request_key": request_key,
        },
    )
    assert again.status_code == 200
    replay = again.json()["data"]
    assert replay["task_id"] == first["task_id"]
    assert replay["report_id"] == first["report_id"]
    assert replay["status"] == "succeeded"

    # tk_task 幂等键 + reserve 幂等键双保险：只有一笔 reserve。
    rows = await _ledger_rows(user_id, "report_basic")
    assert len(rows) == 1
    assert rows[0].status == "committed"
    assert await _count_user_reports(user_id) == 1  # 重放不建新报告行


async def _count_user_reports(user_id: int) -> int:
    from sqlalchemy import func, select

    from packages.shared.db import session_scope
    from packages.shared.models import RpReport

    async with session_scope() as session:
        result = await session.execute(
            select(func.count()).select_from(RpReport).where(RpReport.user_id == user_id)
        )
        return int(result.scalar_one())


# --- 场景 4：首次资格 40920 ---------------------------------------------------


async def test_second_first_report_is_rejected_with_40920(fake_stages: None, client: Any) -> None:
    from apps.worker.report_tasks import _generate_report

    headers, _ = await _login(client)
    data = await _create_report(client, headers)
    await _generate_report(int(data["task_id"]))  # 首单成功，终身资格已用掉

    resp = await client.post(
        "/api/v1/reports",
        headers=headers,
        json={
            "questionnaire": {},
            "photo_object_key": "report_photo/u2.jpg",
            "request_key": f"rk-{uuid.uuid4().hex}",  # 新键：不是幂等重放
        },
    )
    assert resp.status_code == 409
    body = resp.json()
    assert body["code"] == 40920
    assert "30" in (body.get("hint") or "")


# --- 场景 5：失败退款 + derived_features 保留 ----------------------------------


async def test_stage_failure_refunds_and_preserves_derived_features(
    failing_stages: None, client: Any
) -> None:
    from apps.worker.report_tasks import _generate_report
    from packages.report.pipeline import StageFailureError

    headers, user_id = await _login(client)
    data = await _create_report(client, headers)
    task_id, report_id = int(data["task_id"]), int(data["report_id"])

    with pytest.raises(StageFailureError):
        await _generate_report(task_id)

    report = await _fetch_report(report_id)
    assert report.status == "failed"
    # 已完成阶段的产物仍在 + 错误摘要写进 result。
    assert report.result["vision"] == {"features": ["vision_runs"]}
    assert report.result["error"]["stage"] == "boom"

    # T-P3-09 核心：视觉中间态保留——重试/重生成不需要重新上传照片。
    rp_input = await _fetch_input(report_id)
    assert rp_input.derived_features == {"vision_runs": 1}

    task = await _fetch_task(task_id)
    assert task.status == "failed"

    # 退款：consume 流水转 refunded，反向 refund 流水 committed。
    rows = await _ledger_rows(user_id, "report_basic")
    assert [(row.tx_type, row.status) for row in rows] == [
        ("consume", "refunded"),
        ("refund", "committed"),
    ]

    # failed 报告的详情只透错误摘要，不透半成品。
    detail = (await client.get(f"/api/v1/reports/{report_id}", headers=headers)).json()["data"]
    assert set(detail["result"]) == {"error"}
    assert detail["result"]["error"]["stage"] == "boom"


# --- 场景 6：regenerate 走月配额并复用视觉中间态 -------------------------------


async def test_regenerate_uses_month_quota_and_reuses_derived_features(
    fake_stages: None, client: Any
) -> None:
    from apps.worker.report_tasks import _generate_report

    headers, user_id = await _login(client)
    first = await _create_report(client, headers)
    await _generate_report(int(first["task_id"]))

    regen = await client.post(
        f"/api/v1/reports/{first['report_id']}/regenerate",
        headers=headers,
        json={"request_key": f"rk-regen-{uuid.uuid4().hex}"},
    )
    assert regen.status_code == 200
    data = regen.json()["data"]
    assert data["version"] == 2
    new_report_id = int(data["report_id"])
    assert new_report_id != int(first["report_id"])

    # 重新生成走 report_regen 月配额（m:YYYY-MM），不复用终身额度。
    rows = await _ledger_rows(user_id, "report_regen")
    assert len(rows) == 1
    assert rows[0].status == "reserved"
    assert rows[0].period_key.startswith("m:")

    # 新输入行直接带着上一版的视觉中间态（无需重新上传照片）。
    new_input = await _fetch_input(new_report_id)
    assert new_input.derived_features == {"vision_runs": 1}

    await _generate_report(int(data["task_id"]))
    report_v2 = await _fetch_report(new_report_id)
    assert report_v2.status == "succeeded"
    assert report_v2.version == 2
    # 成功后视觉仍未重算：vision_runs 计数保持 1（Fake 阶段非空即跳过）。
    input_after = await _fetch_input(new_report_id)
    assert input_after.derived_features == {"vision_runs": 1}