"""Pure-function tests for app.services.market."""
from __future__ import annotations

import pytest

pytest.importorskip("httpx")
pytest.importorskip("pydantic_settings")

from datetime import datetime, timezone

from app.services.market import _pct, _parse_date, _yahoo_range_covering, parse_symbol


def test_pct_basic():
    assert _pct(100, 110) == 10.0
    assert _pct(100, 90) == -10.0


def test_pct_handles_none_and_zero():
    assert _pct(None, 10) is None
    assert _pct(10, None) is None
    assert _pct(0, 5) is None


def test_parse_date():
    assert _parse_date("2026-03-04") == datetime(2026, 3, 4)


def test_yahoo_range_covering_picks_smallest():
    today = datetime.now(timezone.utc).date()
    # anchor 100 days ago → 1y range is enough
    short = (today.replace(year=today.year)).isoformat()
    assert _yahoo_range_covering(None) == "1y"
    assert _yahoo_range_covering("2026-01-01") == "1y"


def test_parse_symbol_routes_by_prefix():
    fn, ident = parse_symbol("FRED:DFF")
    assert ident == "DFF"
    assert fn.__name__ == "fetch_fred"
    fn2, ident2 = parse_symbol("AAPL")
    assert ident2 == "AAPL"
    assert fn2.__name__ == "fetch_yahoo"
    # Unknown prefix falls through to yahoo.
    fn3, ident3 = parse_symbol("UNKNOWN:XYZ")
    assert ident3 == "UNKNOWN:XYZ"
    assert fn3.__name__ == "fetch_yahoo"