from src.portfolio.runner import rebalance_allocations
from src.portfolio.ledger import PortfolioLedger


class FakeWorker:
    def __init__(self, cap, in_position=False):
        self.capital = cap
        self.in_position = in_position


def test_rebalance_resizes_flat_workers(tmp_path):
    L = PortfolioLedger("PX", total_capital=1000.0, data_dir=tmp_path)
    workers = {"a": FakeWorker(700.0), "b": FakeWorker(500.0)}   # equity 1200, both flat
    rebalance_allocations(L, workers, {"a": 0.5, "b": 0.5})
    assert L.total_capital == 1200.0
    assert workers["a"].capital == 600.0 and workers["b"].capital == 600.0


def test_rebalance_skips_in_position_worker(tmp_path):
    L = PortfolioLedger("PX", total_capital=1000.0, data_dir=tmp_path)
    workers = {"a": FakeWorker(700.0, in_position=True), "b": FakeWorker(500.0)}
    rebalance_allocations(L, workers, {"a": 0.5, "b": 0.5})
    assert L.total_capital == 1200.0
    assert workers["a"].capital == 700.0       # invariato: posizione aperta
    assert workers["b"].capital == 600.0       # flat: riallineato
