"""Tests for the forward-only asking-price history store (price_history.py)."""

from price_history import normalize_reason, update_history


def test_first_sight_new_listing_records_listed_at_first_visible_date() -> None:
    history: dict = {}
    update_history(
        history,
        [{"id": "A", "price": 500000, "first_visible_date": "2026-07-01T09:00:00Z"}],
        "2026-07-12",
    )
    assert history["A"] == [{"date": "2026-07-01", "price": 500000, "reason": "listed"}]


def test_first_sight_already_reduced_uses_event_date_and_reason() -> None:
    history: dict = {}
    update_history(
        history,
        [
            {
                "id": "B",
                "price": 425000,
                "first_visible_date": "2026-06-01T09:00:00Z",
                "listing_update_reason": "price_reduced",
                "listing_update_date": "2026-07-10T14:00:00Z",
            }
        ],
        "2026-07-12",
    )
    assert history["B"] == [{"date": "2026-07-10", "price": 425000, "reason": "reduced"}]


def test_later_run_appends_only_on_price_change_with_direction() -> None:
    history: dict = {}
    listing = {"id": "A", "price": 500000, "first_visible_date": "2026-07-01T09:00:00Z"}
    update_history(history, [listing], "2026-07-12")
    # Unchanged price -> no new point.
    update_history(history, [{"id": "A", "price": 500000}], "2026-07-19")
    assert len(history["A"]) == 1
    # Reduced -> appended, dated to the run.
    update_history(history, [{"id": "A", "price": 480000}], "2026-07-26")
    # Increased -> appended.
    update_history(history, [{"id": "A", "price": 490000}], "2026-08-02")
    assert history["A"] == [
        {"date": "2026-07-01", "price": 500000, "reason": "listed"},
        {"date": "2026-07-26", "price": 480000, "reason": "reduced"},
        {"date": "2026-08-02", "price": 490000, "reason": "increased"},
    ]


def test_zero_or_missing_price_and_id_are_skipped() -> None:
    history: dict = {}
    update_history(
        history,
        [
            {"id": "POA", "price": 0},
            {"id": "", "price": 100000},
            {"price": 100000},  # no id
        ],
        "2026-07-12",
    )
    assert history == {}


def test_run_date_fallback_when_dates_absent() -> None:
    history: dict = {}
    update_history(history, [{"id": "A", "price": 300000}], "2026-07-12")
    assert history["A"] == [{"date": "2026-07-12", "price": 300000, "reason": "listed"}]


def test_normalize_reason_maps_only_price_moves() -> None:
    assert normalize_reason("price_reduced") == "reduced"
    assert normalize_reason("price_increased") == "increased"
    assert normalize_reason("new") is None
    assert normalize_reason("under_offer") is None
    assert normalize_reason(None) is None