"""Unit tests for MemoryQueueAdapter."""

from __future__ import annotations

from datetime import UTC, datetime, timedelta
import threading

import pytest

from python_repositories.adapters.memory_queue_adapter import (
    MemoryQueueAdapter,
    _parse_age,
)
from python_repositories.interfaces.queue_repository_interface import (
    QueueRepositoryInterface,
)


def test_implements_interface() -> None:
    assert issubclass(MemoryQueueAdapter, QueueRepositoryInterface)


def test_fifo_without_dedup() -> None:
    queue = MemoryQueueAdapter()
    queue.enqueue([{"id": 1}, {"id": 2}, {"id": 3}])
    assert queue.size() == 3
    assert queue.dequeue_batch(max_items=2) == [{"id": 1}, {"id": 2}]
    assert queue.dequeue_batch(max_items=10) == [{"id": 3}]
    assert queue.dequeue_batch() == []
    assert queue.size() == 0


def test_empty_enqueue_is_noop() -> None:
    queue = MemoryQueueAdapter()
    queue.enqueue([])
    assert queue.size() == 0
    assert queue.enqueue_and_return_added([]) == []


def test_dedup_keeps_first() -> None:
    queue = MemoryQueueAdapter(dedup_keys=("id",))
    queue.enqueue([{"id": 1, "v": "a"}, {"id": 1, "v": "b"}, {"id": 2, "v": "c"}])
    assert queue.size() == 2
    assert queue.dequeue_batch(max_items=10) == [
        {"id": 1, "v": "a"},
        {"id": 2, "v": "c"},
    ]


def test_missing_dedup_key_raises() -> None:
    queue = MemoryQueueAdapter(dedup_keys=("id",))
    with pytest.raises(ValueError, match="missing dedup key"):
        queue.enqueue([{"name": "x"}])


def test_missing_age_key_raises() -> None:
    queue = MemoryQueueAdapter(age_key="created_at")
    with pytest.raises(ValueError, match="missing age key"):
        queue.enqueue([{"id": 1}])


def test_evict_older_than() -> None:
    queue = MemoryQueueAdapter(age_key="created_at", dedup_keys=("id",))
    now = datetime.now(UTC)
    queue.enqueue(
        [
            {"id": 1, "created_at": now - timedelta(hours=2)},
            {"id": 2, "created_at": now - timedelta(minutes=30)},
            {"id": 3, "created_at": (now - timedelta(hours=3)).isoformat()},
        ]
    )
    removed = queue.evict_older_than(now - timedelta(hours=1))
    assert removed == 2
    assert queue.size() == 1
    remaining = queue.dequeue_batch(max_items=10)
    assert remaining[0]["id"] == 2


def test_evict_without_age_key_is_noop() -> None:
    queue = MemoryQueueAdapter()
    queue.enqueue([{"id": 1}])
    assert queue.evict_older_than(datetime.now(UTC)) == 0
    assert queue.size() == 1


def test_parse_age_rejects_unsupported_type() -> None:
    with pytest.raises(ValueError, match="age value must be"):
        _parse_age(123)


def test_parse_age_aware_datetime() -> None:
    from datetime import timezone

    eastern = timezone(timedelta(hours=-5))
    aware = datetime(2024, 1, 1, 12, 0, 0, tzinfo=eastern)
    assert _parse_age(aware) == datetime(2024, 1, 1, 17, 0, 0, tzinfo=UTC)


def test_parse_age_naive_datetime() -> None:
    naive = datetime(2024, 1, 1, 12, 0, 0)
    assert _parse_age(naive) == datetime(2024, 1, 1, 12, 0, 0, tzinfo=UTC)


def test_parse_age_zulu_string() -> None:
    assert _parse_age("2024-01-01T00:00:00Z") == datetime(2024, 1, 1, 0, 0, 0, tzinfo=UTC)


def test_parse_age_naive_string() -> None:
    assert _parse_age("2024-01-01T00:00:00") == datetime(2024, 1, 1, 0, 0, 0, tzinfo=UTC)


def test_dequeue_rejects_negative_max_items() -> None:
    queue = MemoryQueueAdapter()
    with pytest.raises(ValueError, match="max_items"):
        queue.dequeue_batch(max_items=-1)


def test_clear_and_snapshot() -> None:
    queue = MemoryQueueAdapter()
    queue.enqueue([{"id": 1}, {"id": 2}])
    assert queue.snapshot() == [{"id": 1}, {"id": 2}]
    queue.clear()
    assert queue.size() == 0
    assert queue.snapshot() == []


def test_thread_safety_smoke() -> None:
    queue = MemoryQueueAdapter(dedup_keys=("id",))
    errors: list[BaseException] = []

    def worker(start: int) -> None:
        try:
            for i in range(start, start + 50):
                queue.enqueue([{"id": i}])
        except BaseException as exc:  # noqa: BLE001
            errors.append(exc)

    threads = [threading.Thread(target=worker, args=(i * 50,)) for i in range(4)]
    for thread in threads:
        thread.start()
    for thread in threads:
        thread.join()
    assert errors == []
    assert queue.size() == 200