"""T-4 `convert_repository`（agent 侧 risk_convert_detail）单测（开发计划 §5.2 DoD）。

sqlite 内存库（conftest.sqlite_engine 含 agent 库表 + risk_convert_detail）；
数据由本文件经仓储自建，不依赖真 MySQL。

覆盖：
1. 占位 → completed（阶段二回写详情，含 Decimal 折算字段）
2. 占位 → failed
3. 超时 → expired（list_expired_candidates + mark_expired，S2 标记不硬删）
4. client_request_id 为 None 不受 uk_idem 约束（多次占位互不冲突）
5. get_by_client_request_id 幂等命中 / None 直接返回 None
6. 不与 risk_repository 混职责（convert 写操作不动 risk_alert）
"""

from __future__ import annotations

from datetime import date, datetime, timedelta
from decimal import Decimal

import pytest
from sqlalchemy import text

from app.repository.convert_repository import ConvertRepository
from app.repository.risk_repository import RiskRepository


def _backdate_created_at(engine, group_id: str, hours_ago: int) -> None:
    """把占位行的 created_at 回拨，模拟超时（测试不依赖真实时间漂移）。"""
    old = datetime.now() - timedelta(hours=hours_ago)
    with engine.begin() as conn:
        conn.execute(
            text("UPDATE risk_convert_detail SET created_at = :ts WHERE convert_group_id = :gid"),
            {"ts": old, "gid": group_id},
        )


# ── 1. 占位 → completed ────────────────────────────────────────────────

def test_placeholder_then_complete(sqlite_engine):
    repo = ConvertRepository(engine=sqlite_engine)
    repo.insert_placeholder("G-1", "REQ-1")

    pending = repo.get_by_group_id("G-1")
    assert pending is not None
    assert pending["status"] == "pending"
    assert pending["estimated"] == 0  # 真实请求，非预估单

    repo.complete_convert(
        "G-1",
        out_trade_id="TRD-OUT-1",
        in_trade_id="TRD-IN-1",
        related_trade_id="TRD-REL-1",
        nav=Decimal("1.0234"),
        nav_date=date(2026, 9, 4),
        fee_amount=Decimal("252.40"),
        hold_days_min=3,
        hold_days_max=180,
        nav_stale=True,
    )

    done = repo.get_by_group_id("G-1")
    assert done["status"] == "completed"
    assert done["out_trade_id"] == "TRD-OUT-1"
    assert done["in_trade_id"] == "TRD-IN-1"
    assert done["related_trade_id"] == "TRD-REL-1"
    assert done["nav"] == pytest.approx(1.0234)          # Decimal→float 绑定，读回一致
    assert done["fee_amount"] == pytest.approx(252.40)
    assert date.fromisoformat(str(done["nav_date"])) == date(2026, 9, 4)
    assert done["hold_days_min"] == 3
    assert done["hold_days_max"] == 180
    assert done["nav_stale"] == 1


# ── 2. 占位 → failed ───────────────────────────────────────────────────

def test_placeholder_then_failed(sqlite_engine):
    repo = ConvertRepository(engine=sqlite_engine)
    repo.insert_placeholder("G-2", "REQ-2")
    repo.mark_failed("G-2")

    assert repo.get_by_group_id("G-2")["status"] == "failed"


# ── 3. 超时 → expired（S2 标记不硬删） ───────────────────────────────────

def test_expired_lifecycle(sqlite_engine):
    repo = ConvertRepository(engine=sqlite_engine)
    repo.insert_placeholder("G-3", "REQ-3")
    _backdate_created_at(sqlite_engine, "G-3", hours_ago=48)

    # 超 24h 的 pending 应被捞出
    candidates = repo.list_expired_candidates(24)
    assert any(c["convert_group_id"] == "G-3" for c in candidates)

    repo.mark_expired("G-3")
    row = repo.get_by_group_id("G-3")
    assert row["status"] == "expired"          # 标记，不硬删
    # 标记后不再出现在 pending 候选
    assert not any(c["convert_group_id"] == "G-3" for c in repo.list_expired_candidates(24))


# ── 4. client_request_id 为 None 不受 uk_idem 约束 ───────────────────────

def test_client_request_id_none_not_unique(sqlite_engine):
    repo = ConvertRepository(engine=sqlite_engine)
    # 两次无幂等键占位都应成功（UNIQUE 允许多个 NULL）
    repo.insert_placeholder("G-4", None)
    repo.insert_placeholder("G-5", None)

    assert repo.get_by_group_id("G-4")["status"] == "pending"
    assert repo.get_by_group_id("G-5")["status"] == "pending"
    # None 作为查询键永不命中
    assert repo.get_by_client_request_id(None) is None


# ── 5. 幂等命中查询 ─────────────────────────────────────────────────────

def test_get_by_client_request_id_hit(sqlite_engine):
    repo = ConvertRepository(engine=sqlite_engine)
    repo.insert_placeholder("G-6", "REQ-6")

    row = repo.get_by_client_request_id("REQ-6")
    assert row is not None
    assert row["convert_group_id"] == "G-6"

    assert repo.get_by_client_request_id("REQ-NOPE") is None


# ── 6. 不与 risk_repository 混职责 ──────────────────────────────────────

def test_no_cross_write_to_risk_tables(sqlite_engine):
    """convert 占位只写 risk_convert_detail，绝不污染 risk_alert（职责隔离）。"""
    repo = ConvertRepository(engine=sqlite_engine)
    repo.insert_placeholder("G-7", "REQ-7")

    with sqlite_engine.connect() as conn:
        alert_count = conn.execute(text("SELECT COUNT(*) FROM risk_alert")).scalar_one()
    assert alert_count == 0
    # 类型隔离：两个仓储是不同类，各自只碰自己的表
    assert isinstance(repo, ConvertRepository)
    assert not isinstance(repo, RiskRepository)