"""Warm-pool gate — the reorder/floor decision that keeps the shelf stocked without over-fetching."""
from app.engine.search import pool_decision

FLOOR, REORDER = 90, 100   # the configured thresholds (POOL_SAFETY_FLOOR / POOL_REORDER_AT)


def test_pool_healthy_serves_no_fetch():
    assert pool_decision(150, False, FLOOR, REORDER) == "pool"
    assert pool_decision(100, False, FLOOR, REORDER) == "pool"    # exactly at reorder → still no fetch


def test_pool_dipping_serves_plus_background_refill():
    assert pool_decision(99, False, FLOOR, REORDER) == "pool+refill"   # below reorder → top up in bg
    assert pool_decision(90, False, FLOOR, REORDER) == "pool+refill"   # at the floor → still serve, refill


def test_pool_below_floor_blocks_and_fetches():
    assert pool_decision(89, False, FLOOR, REORDER) == "sweep"    # under the hard floor → blocking fetch
    assert pool_decision(0, False, FLOOR, REORDER) == "sweep"     # empty pool (first search) → fetch


def test_forced_fresh_always_fetches():
    assert pool_decision(999, True, FLOOR, REORDER) == "sweep"    # dev _fresh toggle bypasses the pool
    assert pool_decision(5, True, FLOOR, REORDER, exhausted=True) == "sweep"  # force overrides exhaustion


def test_exhausted_query_serves_instead_of_block_fetching():
    # tapped-out niche query below the floor: serve what's pooled, DON'T re-buy duplicates
    assert pool_decision(30, False, FLOOR, REORDER, exhausted=True) == "pool"   # below floor but exhausted
    assert pool_decision(1, False, FLOOR, REORDER, exhausted=True) == "pool"    # even 1 job → serve it
    # but an EMPTY exhausted pool must still try a fetch (nothing to serve)
    assert pool_decision(0, False, FLOOR, REORDER, exhausted=True) == "sweep"
    # exhaustion does NOT suppress the healthy/refill paths
    assert pool_decision(200, False, FLOOR, REORDER, exhausted=True) == "pool"


def test_floor_never_above_reorder_invariant():
    # the gate only makes sense when floor ≤ reorder (reorder early, floor as the hard backstop)
    from app.config import get_settings
    s = get_settings()
    assert s.POOL_SAFETY_FLOOR <= s.POOL_REORDER_AT