from __future__ import annotations

import subprocess
import sys
from datetime import date
from pathlib import Path
from types import ModuleType

import check_nine_day_decline as decline
import pytest
import run_alerts_with_retry as retry

PAIR = ("tm", "测试款")


def _segment(sales: int, *, days: int = 3) -> dict:
    return {
        "sales": sales,
        "present_days": days,
        "erp_style_codes": ["STYLE-1"],
    }


def _event() -> dict:
    return {
        "style_name": "测试款",
        "platform": "tm",
        "erp_style_codes": ["STYLE-1"],
        "window_start": "2026-07-24",
        "window_end": "2026-08-01",
        "seg1_sales": 300,
        "seg2_sales": 210,
        "seg3_sales": 90,
        "drop_pct_1to2": 30.0,
        "drop_pct_2to3": 57.1,
        "drop_pct_1to3": 70.0,
    }


def _prepare_main(monkeypatch: pytest.MonkeyPatch, tmp_path: Path) -> None:
    monkeypatch.setattr(
        sys,
        "argv",
        [
            "check_nine_day_decline.py",
            "--end-date",
            "2026-08-01",
            "--openid",
            "ou_owner",
            "--data-root",
            str(tmp_path),
        ],
    )
    monkeypatch.setattr(decline, "managed_data_path", lambda value: Path(value))
    monkeypatch.setattr(decline, "append_log", lambda line: None)
    monkeypatch.setattr(
        decline,
        "_persist_detected_events",
        lambda events, *_args: len(events),
    )
    monkeypatch.delenv("GYXX_WORKFLOW_ACCEPTANCE", raising=False)


def test_detect_decline_uses_three_inclusive_postgres_sum_windows(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    observed: list[list[tuple[date, date]]] = []

    def fake_load(windows):
        observed.append(windows)
        return [
            {PAIR: _segment(300)},
            {PAIR: _segment(210)},
            {PAIR: _segment(90)},
        ]

    monkeypatch.setattr(decline, "_load_segment_snapshots", fake_load)

    events = decline.detect_decline("2026-08-01", 9)

    assert observed == [
        [
            (date(2026, 7, 24), date(2026, 7, 26)),
            (date(2026, 7, 27), date(2026, 7, 29)),
            (date(2026, 7, 30), date(2026, 8, 1)),
        ]
    ]
    assert len(events) == 1
    assert events[0]["window_start"] == "2026-07-24"
    assert events[0]["window_end"] == "2026-08-01"
    assert [events[0][f"seg{index}_sales"] for index in range(1, 4)] == [
        300,
        210,
        90,
    ]
    assert events[0]["segment_windows"] == [
        {"start": "2026-07-24", "end": "2026-07-26", "days": 3},
        {"start": "2026-07-27", "end": "2026-07-29", "days": 3},
        {"start": "2026-07-30", "end": "2026-08-01", "days": 3},
    ]


def test_detect_decline_rejects_incomplete_three_day_segment(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    monkeypatch.setattr(
        decline,
        "_load_segment_snapshots",
        lambda windows: [
            {PAIR: _segment(300)},
            {PAIR: _segment(210, days=2)},
            {PAIR: _segment(90)},
        ],
    )

    assert decline.detect_decline("2026-08-01", 9) == []


def test_segment_loader_uses_postgres_range_sum_on_one_connection(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    fake_db = ModuleType("db")
    connection = object()
    observed: list[tuple[object, str, str]] = []

    class ConnectionContext:
        def __enter__(self):
            return connection

        def __exit__(self, *args):
            return False

    def fake_fetch(conn, start, end):
        observed.append((conn, start, end))
        return {}

    fake_db.get_conn = ConnectionContext  # type: ignore[attr-defined]
    fake_db.fetch_daily_for_range = fake_fetch  # type: ignore[attr-defined]
    monkeypatch.setitem(sys.modules, "db", fake_db)
    windows = decline._segment_windows("2026-08-01", 9)

    assert decline._load_segment_snapshots(windows) == [{}, {}, {}]
    assert observed == [
        (connection, "2026-07-24", "2026-07-26"),
        (connection, "2026-07-27", "2026-07-29"),
        (connection, "2026-07-30", "2026-08-01"),
    ]


def test_build_decline_notification_message_is_deterministic() -> None:
    message = decline.build_decline_notification_message(
        [_event()],
        end_date="2026-08-01",
        window_days=9,
    )

    assert "销量连续下滑告警（截至 2026-08-01，3 段 × 3 天）" in message
    assert "[tm] 测试款" in message
    assert "300 → 210 → 90" in message
    assert "累计 -70.0%" in message
    assert "ERP" in message


def test_alert_delivery_uuid_is_stable_and_recipient_scoped() -> None:
    first = decline._notification_delivery_uuid(
        [_event()],
        end_date="2026-08-01",
        window_days=9,
        openid="ou_first",
    )
    same = decline._notification_delivery_uuid(
        [_event()],
        end_date="2026-08-01",
        window_days=9,
        openid="ou_first",
    )
    second = decline._notification_delivery_uuid(
        [_event()],
        end_date="2026-08-01",
        window_days=9,
        openid="ou_second",
    )

    assert first == same
    assert first != second


def test_decline_notification_uses_shared_lark_user_sender(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    captured: dict[str, object] = {}
    monkeypatch.delenv("GYXX_WORKFLOW_ACCEPTANCE", raising=False)

    def fake_send(**kwargs):
        captured.update(kwargs)
        return {"message_id": "om_real123"}

    monkeypatch.setattr(decline, "send_lark_bot_message", fake_send)

    response = decline.send_decline_notification(
        [_event()],
        "2026-08-01",
        9,
        openid="ou_owner",
    )

    assert response["message_id"] == "om_real123"
    assert captured["user_id"] == "ou_owner"
    assert captured["profile"] == "hermes-analyzer"
    assert captured["idempotency_key"] == decline._notification_delivery_uuid(
        [_event()],
        end_date="2026-08-01",
        window_days=9,
        openid="ou_owner",
    )
    assert "测试款" in str(captured["text"])


def test_main_fails_when_postgres_detection_read_fails(
    monkeypatch: pytest.MonkeyPatch,
    tmp_path: Path,
) -> None:
    _prepare_main(monkeypatch, tmp_path)
    monkeypatch.setattr(
        decline,
        "detect_decline",
        lambda *args: (_ for _ in ()).throw(RuntimeError("postgres unavailable")),
    )

    assert decline.main() == 1


def test_main_zero_events_has_explicit_postcondition(
    monkeypatch: pytest.MonkeyPatch,
    tmp_path: Path,
    capsys: pytest.CaptureFixture[str],
) -> None:
    _prepare_main(monkeypatch, tmp_path)
    monkeypatch.setattr(decline, "detect_decline", lambda *args: [])

    assert decline.main() == 0
    output = capsys.readouterr().out
    assert "detection_source=postgresql events=0" in output
    assert "notification=not_required persistence=not_required" in output


def test_main_dedup_query_failure_is_fail_closed(
    monkeypatch: pytest.MonkeyPatch,
    tmp_path: Path,
) -> None:
    _prepare_main(monkeypatch, tmp_path)
    monkeypatch.setattr(decline, "detect_decline", lambda *args: [_event()])
    monkeypatch.setattr(
        decline,
        "_already_notified",
        lambda *args: (_ for _ in ()).throw(RuntimeError("db timeout")),
    )
    notify = pytest.fail
    monkeypatch.setattr(decline, "send_decline_notification", notify)

    assert decline.main() == 5


def test_main_does_not_accept_lark_response_without_real_message_id(
    monkeypatch: pytest.MonkeyPatch,
    tmp_path: Path,
) -> None:
    _prepare_main(monkeypatch, tmp_path)
    monkeypatch.setattr(decline, "detect_decline", lambda *args: [_event()])
    monkeypatch.setattr(decline, "_already_notified", lambda *args: False)
    monkeypatch.setattr(
        decline,
        "send_decline_notification",
        lambda *args, **kwargs: {"ok": True},
    )
    persist = pytest.fail
    monkeypatch.setattr(decline, "_persist_events", persist)

    assert decline.main() == 6


def test_main_returns_nonzero_when_receipt_persistence_fails(
    monkeypatch: pytest.MonkeyPatch,
    tmp_path: Path,
) -> None:
    _prepare_main(monkeypatch, tmp_path)
    monkeypatch.setattr(decline, "detect_decline", lambda *args: [_event()])
    monkeypatch.setattr(decline, "_already_notified", lambda *args: False)
    monkeypatch.setattr(
        decline,
        "send_decline_notification",
        lambda *args, **kwargs: {"message_id": "om_real123"},
    )
    monkeypatch.setattr(
        decline,
        "_persist_events",
        lambda *args, **kwargs: (_ for _ in ()).throw(RuntimeError("write failed")),
    )

    assert decline.main() == 4


def test_main_success_requires_and_persists_feishu_receipt(
    monkeypatch: pytest.MonkeyPatch,
    tmp_path: Path,
    capsys: pytest.CaptureFixture[str],
) -> None:
    _prepare_main(monkeypatch, tmp_path)
    observed: dict[str, object] = {}
    monkeypatch.setattr(decline, "detect_decline", lambda *args: [_event()])
    monkeypatch.setattr(decline, "_already_notified", lambda *args: False)
    monkeypatch.setattr(
        decline,
        "send_decline_notification",
        lambda *args, **kwargs: {"message_id": "om_real123"},
    )

    def fake_persist(*args, **kwargs):
        observed.update(kwargs)
        return 1

    monkeypatch.setattr(decline, "_persist_events", fake_persist)

    assert decline.main() == 0
    assert observed["message_id"] == "om_real123"
    assert observed["openid"] == "ou_owner"
    output = capsys.readouterr().out
    assert "notification=sent feishu_message_id=om_real123" in output
    assert "persistence=committed history_rows=1" in output


def test_main_no_notify_still_detects_hits_and_succeeds(
    monkeypatch: pytest.MonkeyPatch,
    tmp_path: Path,
    capsys: pytest.CaptureFixture[str],
) -> None:
    _prepare_main(monkeypatch, tmp_path)
    monkeypatch.setattr(
        sys,
        "argv",
        [
            "check_nine_day_decline.py",
            "--end-date",
            "2026-08-01",
            "--no-notify",
            "--data-root",
            str(tmp_path),
        ],
    )
    monkeypatch.setattr(decline, "detect_decline", lambda *args: [_event()])
    persisted: list[tuple[list[dict], str, int]] = []
    monkeypatch.setattr(
        decline,
        "_persist_detected_events",
        lambda events, end_date, window_days: (
            persisted.append((events, end_date, window_days)) or len(events)
        ),
    )
    monkeypatch.setattr(
        decline,
        "_already_notified",
        lambda *args: pytest.fail("disabled notification must not query receipts"),
    )
    monkeypatch.setattr(
        decline,
        "send_decline_notification",
        lambda *args, **kwargs: pytest.fail("disabled notification must not send"),
    )

    assert decline.main() == 0
    assert persisted == [([_event()], "2026-08-01", 9)]
    output = capsys.readouterr().out
    assert "events=1 notification=disabled persistence=committed" in output
    assert "detection_rows=1" in output


def test_main_blocks_notification_when_detection_output_cannot_be_persisted(
    monkeypatch: pytest.MonkeyPatch,
    tmp_path: Path,
) -> None:
    _prepare_main(monkeypatch, tmp_path)
    monkeypatch.setattr(decline, "detect_decline", lambda *args: [_event()])
    monkeypatch.setattr(
        decline,
        "_persist_detected_events",
        lambda *_args: (_ for _ in ()).throw(RuntimeError("write failed")),
    )
    monkeypatch.setattr(
        decline,
        "send_decline_notification",
        lambda *args, **kwargs: pytest.fail("must not send without durable output"),
    )

    assert decline.main() == 5


def test_main_sends_and_persists_each_recipient_independently(
    monkeypatch: pytest.MonkeyPatch,
    tmp_path: Path,
) -> None:
    _prepare_main(monkeypatch, tmp_path)
    monkeypatch.setattr(
        sys,
        "argv",
        [
            "check_nine_day_decline.py",
            "--end-date",
            "2026-08-01",
            "--openid",
            "ou_first",
            "--openid",
            "ou_second",
            "--data-root",
            str(tmp_path),
        ],
    )
    monkeypatch.setattr(decline, "detect_decline", lambda *args: [_event()])
    dedup_queries: list[str] = []
    persisted: list[tuple[str, str]] = []

    def fake_already_notified(_style, _date, recipient):
        dedup_queries.append(recipient)
        return False

    def fake_notify(*_args, openid, **_kwargs):
        return {"message_id": f"om_{openid.removeprefix('ou_')}"}

    def fake_persist(*_args, openid, message_id, **_kwargs):
        persisted.append((openid, message_id))
        return 1

    monkeypatch.setattr(decline, "_already_notified", fake_already_notified)
    monkeypatch.setattr(decline, "send_decline_notification", fake_notify)
    monkeypatch.setattr(decline, "_persist_events", fake_persist)

    assert decline.main() == 0
    assert dedup_queries == ["ou_first", "ou_second"]
    assert persisted == [
        ("ou_first", "om_first"),
        ("ou_second", "om_second"),
    ]


def test_alert_schema_and_upsert_are_recipient_scoped() -> None:
    repository_root = Path(__file__).resolve().parents[3]
    schema = (
        repository_root
        / "src"
        / "gyxx_flow"
        / "modules"
        / "product_commerce"
        / "db"
        / "schema.sql"
    ).read_text(encoding="utf-8")
    db_module = (
        repository_root
        / "src"
        / "gyxx_flow"
        / "modules"
        / "product_commerce"
        / "db"
        / "__init__.py"
    ).read_text(encoding="utf-8")

    assert "UNIQUE (style_name, trigger_date, recipient)" in schema
    assert "DROP CONSTRAINT IF EXISTS fact_alert_history_style_name_trigger_date_key" in schema
    assert "ON CONFLICT (style_name, trigger_date, recipient)" in db_module
    assert "def ensure_alert_history_recipient_scope" in db_module
    assert "fact_alert_history_style_name_trigger_date_key" in db_module


def test_detected_output_migrates_recipient_scope_before_upsert(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    fake_db = ModuleType("db")
    connection = object()
    calls: list[tuple[str, object]] = []

    class ConnectionContext:
        def __enter__(self):
            return connection

        def __exit__(self, *args):
            return False

    fake_db.get_conn = ConnectionContext  # type: ignore[attr-defined]
    fake_db.ensure_alert_history_recipient_scope = (  # type: ignore[attr-defined]
        lambda conn: calls.append(("migrate", conn))
    )
    fake_db.upsert_decline_event = (  # type: ignore[attr-defined]
        lambda conn, event: calls.append(("upsert", (conn, event)))
    )
    monkeypatch.setitem(sys.modules, "db", fake_db)

    assert decline._persist_detected_events([_event()], "2026-08-01", 9) == 1
    assert calls[0] == ("migrate", connection)
    assert calls[1][0] == "upsert"


class _FailedCollector:
    def __init__(self, *args):
        self.pages: list[tuple] = []

    def add_page(self, *args, **kwargs):
        self.pages.append((args, kwargs))

    def write(self):
        return None

    def summary_line(self):
        return "failure"


def test_retry_wrapper_does_not_repeat_after_possible_success(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    calls: list[list[str]] = []
    monkeypatch.setattr(
        sys,
        "argv",
        [
            "run_alerts_with_retry.py",
            "--end-date",
            "2026-08-01",
            "--openid",
            "ou_owner",
        ],
    )
    monkeypatch.setattr(retry, "FailedCollector", _FailedCollector)
    monkeypatch.setattr(retry, "consolidate_failed_logs", lambda value: None)
    monkeypatch.setattr(retry, "build_child_environment", lambda *args: {})
    monkeypatch.setattr(
        retry.time,
        "sleep",
        lambda seconds: pytest.fail("non-retryable result must not sleep"),
    )

    def fake_run(command, **kwargs):
        calls.append(command)
        return subprocess.CompletedProcess(command, 4)

    monkeypatch.setattr(retry.subprocess, "run", fake_run)

    assert retry.main() == 4
    assert len(calls) == 1


def test_retry_wrapper_can_retry_fail_closed_dedup_read(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    return_codes = iter((5, 0))
    sleeps: list[int] = []
    monkeypatch.setattr(
        sys,
        "argv",
        [
            "run_alerts_with_retry.py",
            "--end-date",
            "2026-08-01",
            "--openid",
            "ou_owner",
        ],
    )
    monkeypatch.setattr(retry, "FailedCollector", _FailedCollector)
    monkeypatch.setattr(retry, "consolidate_failed_logs", lambda value: None)
    monkeypatch.setattr(retry, "build_child_environment", lambda *args: {})
    monkeypatch.setattr(retry.time, "sleep", sleeps.append)
    monkeypatch.setattr(
        retry.subprocess,
        "run",
        lambda command, **kwargs: subprocess.CompletedProcess(
            command,
            next(return_codes),
        ),
    )

    assert retry.main() == 0
    assert sleeps == [retry.RUN_SLEEP_SECONDS]