"""KRX 호가단위(tick) 유틸 단위 테스트 (REQ-083, dcy-030)."""
import pytest

from trex_core.domain.pricing import ceil_to_tick, floor_to_tick, krx_stock_tick


class TestKrxStockTick:
    @pytest.mark.parametrize("price,tick", [
        (1_500, 1),
        (3_000, 5),
        (12_000, 10),
        (35_000, 50),
        (147_700, 100),
        (300_000, 500),
        (800_000, 1_000),
    ])
    def test_representative_prices(self, price, tick):
        assert krx_stock_tick(price) == tick

    @pytest.mark.parametrize("boundary,tick", [
        (2_000, 5),       # [2000, 5000) -> 5 (lower bound inclusive)
        (5_000, 10),
        (20_000, 50),
        (50_000, 100),
        (200_000, 500),
        (500_000, 1_000),
    ])
    def test_boundaries_are_lower_inclusive(self, boundary, tick):
        assert krx_stock_tick(boundary) == tick

    def test_just_below_boundary_uses_lower_band(self):
        assert krx_stock_tick(1_999) == 1
        assert krx_stock_tick(49_999) == 50
        assert krx_stock_tick(199_999) == 100


class TestFloorCeilToTick:
    def test_issue28_floor_cases(self):
        assert floor_to_tick(148_439) == 148_400
        assert floor_to_tick(54_773) == 54_700

    def test_ceil_case(self):
        assert ceil_to_tick(54_773) == 54_800

    def test_already_on_tick_is_unchanged(self):
        assert floor_to_tick(147_700) == 147_700
        assert ceil_to_tick(147_700) == 147_700

    @pytest.mark.parametrize("price", [
        1_500, 2_777, 4_999, 12_345, 33_333, 148_439, 234_567, 777_777,
    ])
    def test_invariants_floor_le_price_le_ceil_and_valid_multiples(self, price):
        tick = krx_stock_tick(price)
        f = floor_to_tick(price)
        c = ceil_to_tick(price)
        assert f <= price <= c
        assert f % krx_stock_tick(f) == 0
        assert c % krx_stock_tick(c) == 0
        assert c - f <= tick