import pytest
from datetime import date
from types import SimpleNamespace

from room_cal.discount import DiscountData, DiscountType
from room_cal.pricing import CalPrice
from room_cal.pricing.price_calendar import PriceData
from room_cal.rules.discount.min_price import RULE_NAME, run


def _stub_prices(monkeypatch, bases: dict[date, int]):
  async def _get(self, start_date, end_date):
    return {str(d): PriceData(base=base, net=base) for d, base in bases.items()}
  monkeypatch.setattr(CalPrice, 'get', _get)


def _stub_config(monkeypatch, min_net: int):
  cfg = SimpleNamespace(rules=SimpleNamespace(min_price=SimpleNamespace(min_net=min_net)))
  monkeypatch.setattr('room_cal.rules.discount.min_price.get_config', lambda: cfg)


def test_rule_registered():
  assert RULE_NAME == 'min_price'


@pytest.mark.asyncio
async def test_empty_input_returns_empty():
  assert await run(date(2026, 1, 1), date(2026, 1, 1), {}) == {}


@pytest.mark.asyncio
async def test_percent_discount_clamped_to_floor(monkeypatch):
  d = date(2026, 1, 10)
  _stub_prices(monkeypatch, {d: 100})
  _stub_config(monkeypatch, 52)
  data = {d: DiscountData(type=DiscountType.PERCENT, value=60)}
  result = await run(d, d, data)
  # headroom = 100 - 52 = 48 -> max_pct = 48%
  assert result[d].value == 48


@pytest.mark.asyncio
async def test_flat_discount_clamped_to_floor(monkeypatch):
  d = date(2026, 1, 10)
  _stub_prices(monkeypatch, {d: 100})
  _stub_config(monkeypatch, 52)
  data = {d: DiscountData(type=DiscountType.FLAT, value=60)}
  result = await run(d, d, data)
  assert result[d].value == 48


@pytest.mark.asyncio
async def test_discount_under_floor_passes_through(monkeypatch):
  d = date(2026, 1, 10)
  _stub_prices(monkeypatch, {d: 100})
  _stub_config(monkeypatch, 52)
  data = {d: DiscountData(type=DiscountType.PERCENT, value=30)}
  result = await run(d, d, data)
  assert result[d].value == 30


@pytest.mark.asyncio
async def test_base_at_or_below_floor_drops_discount(monkeypatch):
  d = date(2026, 1, 10)
  _stub_prices(monkeypatch, {d: 50})
  _stub_config(monkeypatch, 52)
  data = {d: DiscountData(type=DiscountType.PERCENT, value=10)}
  result = await run(d, d, data)
  assert d not in result