"""Tests for period validation, period -> column mapping, and snapshot_dt rules."""

from __future__ import annotations

from datetime import date, timedelta

import pytest

from app.schemas import FunnelQueryRequest, Period
from app.services.funnel import (
    ROLLING_SUFFIX,
    SnapshotDateError,
    daily_columns,
    rolling_columns,
    validate_snapshot_dt,
)


def test_period_accepts_three_valid_values() -> None:
    for value in ("day", "last_7d", "last_30d"):
        req = FunnelQueryRequest(period=value)
        assert req.period.value == value


def test_period_rejects_bad_value() -> None:
    with pytest.raises(ValueError):
        FunnelQueryRequest(period="yesterday")  # old v2 value, now invalid


def test_request_snapshot_dt_optional() -> None:
    req = FunnelQueryRequest(period="day")
    assert req.snapshot_dt is None

    req2 = FunnelQueryRequest(period="day", snapshot_dt="2026-06-20")
    assert req2.snapshot_dt == date(2026, 6, 20)


def test_rolling_suffix_mapping() -> None:
    assert ROLLING_SUFFIX[Period.last_7d] == "7d"
    assert ROLLING_SUFFIX[Period.last_30d] == "30d"


def test_daily_columns() -> None:
    assert daily_columns() == [
        "uv_start",
        "uv_show",
        "uv_detail",
        "uv_order",
        "uv_paid",
    ]


def test_rolling_columns_last_7d() -> None:
    assert rolling_columns(Period.last_7d) == [
        "uv_start_7d",
        "uv_show_7d",
        "uv_detail_7d",
        "uv_order_7d",
        "uv_paid_7d",
    ]


def test_rolling_columns_last_30d() -> None:
    assert rolling_columns(Period.last_30d) == [
        "uv_start_30d",
        "uv_show_30d",
        "uv_detail_30d",
        "uv_order_30d",
        "uv_paid_30d",
    ]


def test_validate_snapshot_dt_accepts_yesterday() -> None:
    yesterday = date.today() - timedelta(days=1)
    validate_snapshot_dt(yesterday)  # no raise


def test_validate_snapshot_dt_accepts_old_date() -> None:
    validate_snapshot_dt(date.today() - timedelta(days=30))  # no raise


def test_validate_snapshot_dt_rejects_today() -> None:
    with pytest.raises(SnapshotDateError):
        validate_snapshot_dt(date.today())


def test_validate_snapshot_dt_rejects_future() -> None:
    with pytest.raises(SnapshotDateError):
        validate_snapshot_dt(date.today() + timedelta(days=1))