"""HTTP contract tests for the Home market-data overview."""

from datetime import UTC, date, datetime
from decimal import Decimal

from fastapi.testclient import TestClient

from zhixing_server.bootstrap.app import create_app
from zhixing_server.modules.market_data.application.overview import (
    MarketDataOverviewReader,
)
from zhixing_server.modules.market_data.domain.overview import (
    MarketDataOverview,
    MarketDataUpdate,
    OverviewBatchError,
    OverviewFailure,
)
from zhixing_server.modules.market_data.presentation.home import (
    get_market_data_overview_reader,
)

TARGET_DATE = date(2026, 8, 6)


class FakeOverviewReader:
    """Small in-memory read adapter used at the HTTP dependency seam."""

    def __init__(self, overview: MarketDataOverview) -> None:
        self.overview = overview

    def read_overview(self) -> MarketDataOverview:
        return self.overview


def get_client(overview: MarketDataOverview) -> TestClient:
    """Build the real application with only its read adapter overridden."""

    application = create_app()
    reader = FakeOverviewReader(overview)

    def override_reader() -> MarketDataOverviewReader:
        return reader

    application.dependency_overrides[get_market_data_overview_reader] = override_reader
    return TestClient(application)


def test_home_overview_returns_complete_success_contract() -> None:
    """A complete batch exposes active-pool counts and Shanghai completion time."""

    response = get_client(
        MarketDataOverview(
            status="success",
            stock_pool_count=2,
            latest_update=MarketDataUpdate(
                trade_date=TARGET_DATE,
                completed_at=datetime(2026, 8, 7, 8, 30, tzinfo=UTC),
                status="success",
                target_count=2,
                successful_count=2,
                failed_count=0,
                valid_count=2,
                coverage_rate=Decimal("1"),
                failures=(),
                batch_errors=(),
            ),
        )
    ).get("/api/v1/home/overview")

    assert response.status_code == 200
    assert response.json() == {
        "status": "success",
        "stock_pool_count": 2,
        "latest_update": {
            "trade_date": "2026-08-06",
            "completed_at": "2026-08-07T16:30:00+08:00",
            "status": "success",
            "target_count": 2,
            "successful_count": 2,
            "failed_count": 0,
            "valid_count": 2,
            "coverage_rate": 1.0,
            "failures": [],
            "batch_errors": [],
        },
    }


def test_home_overview_keeps_stock_and_batch_failures_separate() -> None:
    """Partial results preserve failure categories and batch-level errors."""

    response = get_client(
        MarketDataOverview(
            status="partial_success",
            stock_pool_count=3,
            latest_update=MarketDataUpdate(
                trade_date=TARGET_DATE,
                completed_at=datetime(2026, 8, 6, 16, 30),
                status="partial_success",
                target_count=3,
                successful_count=1,
                failed_count=2,
                valid_count=1,
                coverage_rate=Decimal("0.3333333333"),
                failures=(
                    OverviewFailure(
                        ts_code="000001.SZ",
                        name="平安银行",
                        failure_type="missing_daily_bar",
                        reason="目标交易日缺少日线行情",
                        trade_date=TARGET_DATE,
                    ),
                    OverviewFailure(
                        ts_code="600000.SH",
                        name="浦发银行",
                        failure_type="recorded_stock_failure",
                        reason="供应商请求失败",
                        trade_date=TARGET_DATE,
                    ),
                ),
                batch_errors=(
                    OverviewBatchError(
                        item_key="retention",
                        error_type="database_error",
                        reason="保留策略执行失败",
                    ),
                ),
            ),
        )
    ).get("/api/v1/home/overview")

    assert response.status_code == 200
    payload = response.json()
    assert payload["latest_update"]["failed_count"] == 2
    assert payload["latest_update"]["coverage_rate"] == 0.3333333333
    assert payload["latest_update"]["failures"][0]["failure_type"] == "missing_daily_bar"
    assert payload["latest_update"]["batch_errors"] == [
        {
            "item_key": "retention",
            "error_type": "database_error",
            "reason": "保留策略执行失败",
        }
    ]


def test_home_overview_returns_updating_without_completion_time() -> None:
    """A running batch remains distinguishable from an absent batch."""

    response = get_client(
        MarketDataOverview(
            status="updating",
            stock_pool_count=1,
            latest_update=MarketDataUpdate(
                trade_date=TARGET_DATE,
                completed_at=None,
                status="updating",
                target_count=1,
                successful_count=0,
                failed_count=1,
                valid_count=0,
                coverage_rate=Decimal("0"),
                failures=(),
                batch_errors=(),
            ),
        )
    ).get("/api/v1/home/overview")

    assert response.status_code == 200
    assert response.json()["status"] == "updating"
    assert response.json()["latest_update"]["completed_at"] is None


def test_home_overview_returns_failed_batch_without_fabricating_stock_errors() -> None:
    """A failed batch keeps infrastructure errors separate from stock details."""

    response = get_client(
        MarketDataOverview(
            status="failed",
            stock_pool_count=2,
            latest_update=MarketDataUpdate(
                trade_date=TARGET_DATE,
                completed_at=datetime(2026, 8, 6, 16, 30),
                status="failed",
                target_count=2,
                successful_count=0,
                failed_count=2,
                valid_count=0,
                coverage_rate=Decimal("0"),
                failures=(),
                batch_errors=(
                    OverviewBatchError(
                        item_key="retention",
                        error_type="database_error",
                        reason="保留策略执行失败",
                    ),
                ),
            ),
        )
    ).get("/api/v1/home/overview")

    assert response.status_code == 200
    assert response.json()["status"] == "failed"
    assert response.json()["latest_update"]["failures"] == []
    assert response.json()["latest_update"]["batch_errors"][0]["item_key"] == "retention"


def test_home_overview_returns_no_data_without_fake_update() -> None:
    """No synchronization batch is represented by a null latest update."""

    response = get_client(
        MarketDataOverview(status="no_data", stock_pool_count=7, latest_update=None)
    ).get("/api/v1/home/overview")

    assert response.status_code == 200
    assert response.json() == {
        "status": "no_data",
        "stock_pool_count": 7,
        "latest_update": None,
    }