"""缓存模块测试"""

from __future__ import annotations

import time

import pytest

from minenasai.core.cache import (
    MemoryCache,
    RateLimiter,
    get_rate_limiter,
    get_response_cache,
    make_cache_key,
)


class TestMemoryCache:
    """MemoryCache 测试"""

    def test_set_and_get(self):
        """测试设置和获取"""
        cache: MemoryCache[str] = MemoryCache()

        cache.set("key1", "value1")
        assert cache.get("key1") == "value1"

    def test_get_nonexistent(self):
        """测试获取不存在的 key"""
        cache: MemoryCache[str] = MemoryCache()

        assert cache.get("nonexistent") is None

    def test_ttl_expiration(self):
        """测试 TTL 过期"""
        cache: MemoryCache[str] = MemoryCache(default_ttl=0.1)

        cache.set("key1", "value1")
        assert cache.get("key1") == "value1"

        time.sleep(0.15)
        assert cache.get("key1") is None

    def test_custom_ttl(self):
        """测试自定义 TTL"""
        cache: MemoryCache[str] = MemoryCache(default_ttl=10.0)

        cache.set("key1", "value1", ttl=0.1)

        time.sleep(0.15)
        assert cache.get("key1") is None

    def test_delete(self):
        """测试删除"""
        cache: MemoryCache[str] = MemoryCache()

        cache.set("key1", "value1")
        assert cache.delete("key1") is True
        assert cache.get("key1") is None
        assert cache.delete("key1") is False

    def test_clear(self):
        """测试清空"""
        cache: MemoryCache[str] = MemoryCache()

        cache.set("key1", "value1")
        cache.set("key2", "value2")

        count = cache.clear()
        assert count == 2
        assert cache.get("key1") is None
        assert cache.get("key2") is None

    def test_exists(self):
        """测试存在检查"""
        cache: MemoryCache[str] = MemoryCache()

        cache.set("key1", "value1")
        assert cache.exists("key1") is True
        assert cache.exists("key2") is False

    def test_max_size_eviction(self):
        """测试最大容量淘汰"""
        cache: MemoryCache[int] = MemoryCache(max_size=5)

        for i in range(10):
            cache.set(f"key{i}", i)

        # 应该只保留部分
        assert len(cache._cache) <= 5

    def test_hit_tracking(self):
        """测试命中跟踪"""
        cache: MemoryCache[str] = MemoryCache()

        cache.set("key1", "value1")

        cache.get("key1")
        cache.get("key1")
        cache.get("nonexistent")

        stats = cache.get_stats()
        assert stats["hits"] == 2
        assert stats["misses"] == 1

    def test_get_stats(self):
        """测试获取统计"""
        cache: MemoryCache[str] = MemoryCache(max_size=100, default_ttl=60.0)

        cache.set("key1", "value1")
        cache.get("key1")

        stats = cache.get_stats()

        assert stats["size"] == 1
        assert stats["max_size"] == 100
        assert stats["default_ttl"] == 60.0
        assert "hit_rate" in stats


class TestRateLimiter:
    """RateLimiter 测试"""

    def test_acquire_within_limit(self):
        """测试在限制内获取"""
        limiter = RateLimiter(rate=10.0, burst=5)

        # 可以获取 burst 数量的令牌
        for _ in range(5):
            assert limiter.acquire() is True

    def test_acquire_exceeds_limit(self):
        """测试超出限制"""
        limiter = RateLimiter(rate=10.0, burst=2)

        assert limiter.acquire() is True
        assert limiter.acquire() is True
        assert limiter.acquire() is False

    def test_token_refill(self):
        """测试令牌补充"""
        limiter = RateLimiter(rate=100.0, burst=2)

        # 消耗所有令牌
        limiter.acquire()
        limiter.acquire()
        assert limiter.acquire() is False

        # 等待补充
        time.sleep(0.05)
        assert limiter.acquire() is True

    def test_available_tokens(self):
        """测试可用令牌数"""
        limiter = RateLimiter(rate=10.0, burst=5)

        assert limiter.available_tokens == pytest.approx(5.0, abs=0.1)

        limiter.acquire(2)
        assert limiter.available_tokens == pytest.approx(3.0, abs=0.1)

    @pytest.mark.asyncio
    async def test_wait(self):
        """测试等待获取"""
        limiter = RateLimiter(rate=100.0, burst=1)

        limiter.acquire()

        start = time.time()
        await limiter.wait()
        elapsed = time.time() - start

        # 应该等待了一小段时间
        assert elapsed > 0


class TestCacheKey:
    """make_cache_key 测试"""

    def test_same_args_same_key(self):
        """测试相同参数生成相同 key"""
        key1 = make_cache_key("a", "b", c=1)
        key2 = make_cache_key("a", "b", c=1)

        assert key1 == key2

    def test_different_args_different_key(self):
        """测试不同参数生成不同 key"""
        key1 = make_cache_key("a", "b")
        key2 = make_cache_key("a", "c")

        assert key1 != key2

    def test_kwargs_order_independent(self):
        """测试 kwargs 顺序无关"""
        key1 = make_cache_key(a=1, b=2)
        key2 = make_cache_key(b=2, a=1)

        assert key1 == key2


class TestGlobalInstances:
    """全局实例测试"""

    def test_get_response_cache(self):
        """测试获取响应缓存"""
        cache = get_response_cache()
        assert isinstance(cache, MemoryCache)

    def test_get_rate_limiter(self):
        """测试获取速率限制器"""
        limiter = get_rate_limiter("test", rate=10.0, burst=20)
        assert isinstance(limiter, RateLimiter)

    def test_get_rate_limiter_reuse(self):
        """测试速率限制器复用"""
        limiter1 = get_rate_limiter("shared")
        limiter2 = get_rate_limiter("shared")

        assert limiter1 is limiter2