import pathlib
import sys

# Q98 / 2026-10-27: resolve lfu_cache from THIS file's directory and nowhere
# else. This line used to read
#     sys.path.insert(0, "/root/.hermes/wizard-outputs/beam")
# which put a HOST directory first on sys.path for the whole process: all eight
# cells below graded /root/.hermes/wizard-outputs/beam/lfu_cache.py, so a
# poisoned copy of the committed module still read `8 passed`, and the lane's
# own `bash wizard-work/beam/CHECK` read rc 1 with
#   ImportError: 'test_lru_cache' module incorrectly imported from
#   '/root/.hermes/wizard-outputs/beam'
# The assertion below is the part that makes the binding a fact rather than an
# intention: it is the rule test_toposort.py (Q61) already states.
sys.path.insert(0, str(pathlib.Path(__file__).resolve().parent))

import lfu_cache as lfu_cache_module
from lfu_cache import LFUCache

assert pathlib.Path(lfu_cache_module.__file__).resolve() == \
    pathlib.Path(__file__).resolve().parent / "lfu_cache.py", \
    lfu_cache_module.__file__


def test_basic_get_put():
    c = LFUCache(2)
    c.put(1, 10)
    c.put(2, 20)
    assert c.get(1) == 10
    assert c.get(2) == 20
    assert c.get(3) == -1


def test_evict_least_freq():
    c = LFUCache(2)
    c.put(1, 10)
    c.put(2, 20)
    c.get(1)  # freq 1->2
    c.put(3, 30)  # evict 2 (freq1)
    assert c.get(2) == -1
    assert c.get(1) == 10
    assert c.get(3) == 30


def test_lru_within_same_freq():
    c = LFUCache(2)
    c.put(1, 10)
    c.put(2, 20)
    # both freq1; touch nothing extra; insert 3 evicts LRU among freq1 -> key1
    c.put(3, 30)
    assert c.get(1) == -1
    assert c.get(2) == 20
    assert c.get(3) == 30


def test_update_existing():
    c = LFUCache(2)
    c.put(1, 10)
    c.put(1, 11)
    assert c.get(1) == 11
    # updating counts as access; freq now 2


def test_capacity_zero():
    c = LFUCache(0)
    c.put(1, 10)
    assert c.get(1) == -1


def test_evict_after_freq_tiebreak():
    c = LFUCache(3)
    c.put(1, 1)
    c.put(2, 2)
    c.put(3, 3)
    c.get(1)
    c.get(2)
    # freq: 1->2, 2->2, 3->1 ; min freq bucket {3}
    c.put(4, 4)  # evict 3
    assert c.get(3) == -1
    assert c.get(1) == 1 and c.get(2) == 2 and c.get(4) == 4


def test_negative_capacity_raises():
    try:
        LFUCache(-1)
        assert False
    except ValueError:
        pass


def test_many_ops_stress():
    # brute-force compare against a naive dict-based LFU
    import random
    random.seed(42)
    cap = 5
    c = LFUCache(cap)
    # naive
    store = {}
    freq = {}
    order = {}  # key -> insertion/access counter for LRU tiebreak
    counter = [0]

    def naive_get(k):
        if k not in store:
            return -1
        freq[k] += 1
        counter[0] += 1
        order[k] = counter[0]
        return store[k]

    def naive_put(k, v):
        nonlocal store
        if cap == 0:
            return
        if k in store:
            store[k] = v
            freq[k] += 1
            counter[0] += 1
            order[k] = counter[0]
            return
        if len(store) >= cap:
            # evict min freq, then min order
            minf = min(freq[x] for x in store)
            candidates = [x for x in store if freq[x] == minf]
            victim = min(candidates, key=lambda x: order[x])
            del store[victim]; del freq[victim]; del order[victim]
        store[k] = v
        freq[k] = 1
        counter[0] += 1
        order[k] = counter[0]

    ops = 2000
    keys = list(range(1, 12))
    for _ in range(ops):
        k = random.choice(keys)
        if random.random() < 0.5:
            a = c.get(k)
            b = naive_get(k)
            assert a == b, (a, b, k)
        else:
            v = random.randint(0, 99)
            c.put(k, v)
            naive_put(k, v)
    # final consistency: all keys
    for k in keys:
        assert c.get(k) == naive_get(k), k


if __name__ == "__main__":
    for name in [n for n in globals() if n.startswith("test_")]:
        globals()[name]()
    print("ALL TESTS PASSED")