"""GraphRAG 缓存的单元测试。"""

from __future__ import annotations

import time

from app.module.kg_graphrag.cache import CacheStats, GraphRAGCache, make_cache_key


# ---------------------------------------------------------------------------
# CacheStats
# ---------------------------------------------------------------------------


class TestCacheStats:
    """CacheStats 统计逻辑测试。"""

    def test_hit_rate_no_access(self):
        stats = CacheStats()
        assert stats.hit_rate == 0.0

    def test_hit_rate_all_hits(self):
        stats = CacheStats(hits=10, misses=0)
        assert stats.hit_rate == 1.0

    def test_hit_rate_mixed(self):
        stats = CacheStats(hits=3, misses=7)
        assert abs(stats.hit_rate - 0.3) < 1e-9

    def test_to_dict_contains_all_fields(self):
        stats = CacheStats(hits=5, misses=3, evictions=1)
        d = stats.to_dict()
        assert d["hits"] == 5
        assert d["misses"] == 3
        assert d["evictions"] == 1
        assert "hit_rate" in d


# ---------------------------------------------------------------------------
# GraphRAGCache — KG 缓存
# ---------------------------------------------------------------------------


class TestKGCache:
    """KG 缓存（全文搜索 + 子图导出）测试。"""

    def test_get_miss_returns_none(self):
        cache = GraphRAGCache(kg_maxsize=10, kg_ttl=60)
        assert cache.get_kg("nonexistent") is None

    def test_set_then_get_hit(self):
        cache = GraphRAGCache(kg_maxsize=10, kg_ttl=60)
        cache.set_kg("key1", {"entities": [1, 2, 3]})
        result = cache.get_kg("key1")
        assert result == {"entities": [1, 2, 3]}

    def test_stats_count_hits_and_misses(self):
        cache = GraphRAGCache(kg_maxsize=10, kg_ttl=60)
        cache.set_kg("a", "value-a")

        cache.get_kg("a")  # hit
        cache.get_kg("a")  # hit
        cache.get_kg("b")  # miss

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

    def test_maxsize_evicts_oldest(self):
        cache = GraphRAGCache(kg_maxsize=2, kg_ttl=60)
        cache.set_kg("a", 1)
        cache.set_kg("b", 2)
        cache.set_kg("c", 3)  # should evict "a"

        assert cache.get_kg("a") is None
        assert cache.get_kg("c") == 3

    def test_ttl_expiry(self):
        cache = GraphRAGCache(kg_maxsize=10, kg_ttl=1)
        cache.set_kg("ephemeral", "data")
        assert cache.get_kg("ephemeral") == "data"

        time.sleep(1.1)
        assert cache.get_kg("ephemeral") is None

    def test_clear_removes_all(self):
        cache = GraphRAGCache(kg_maxsize=10, kg_ttl=60)
        cache.set_kg("x", 1)
        cache.set_kg("y", 2)
        cache.clear()

        assert cache.get_kg("x") is None
        assert cache.get_kg("y") is None


# ---------------------------------------------------------------------------
# GraphRAGCache — Embedding 缓存
# ---------------------------------------------------------------------------


class TestEmbeddingCache:
    """Embedding 向量缓存测试。"""

    def test_get_miss_returns_none(self):
        cache = GraphRAGCache(embedding_maxsize=10, embedding_ttl=60)
        assert cache.get_embedding("query-1") is None

    def test_set_then_get_hit(self):
        cache = GraphRAGCache(embedding_maxsize=10, embedding_ttl=60)
        vec = [0.1, 0.2, 0.3, 0.4]
        cache.set_embedding("query-1", vec)
        assert cache.get_embedding("query-1") == vec

    def test_stats_count_hits_and_misses(self):
        cache = GraphRAGCache(embedding_maxsize=10, embedding_ttl=60)
        cache.set_embedding("q1", [1.0])
        cache.get_embedding("q1")  # hit
        cache.get_embedding("q2")  # miss

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


# ---------------------------------------------------------------------------
# GraphRAGCache — 整体统计
# ---------------------------------------------------------------------------


class TestCacheOverallStats:
    """缓存整体统计测试。"""

    def test_stats_structure(self):
        cache = GraphRAGCache(kg_maxsize=5, kg_ttl=60, embedding_maxsize=10, embedding_ttl=60)
        stats = cache.stats()

        assert "kg" in stats
        assert "embedding" in stats
        assert "size" in stats["kg"]
        assert "maxsize" in stats["kg"]
        assert "hits" in stats["kg"]
        assert "misses" in stats["kg"]

    def test_zero_maxsize_disables_caching(self):
        """maxsize=0 时，所有 set 都是 no-op。"""
        cache = GraphRAGCache(kg_maxsize=0, kg_ttl=1, embedding_maxsize=0, embedding_ttl=1)
        cache.set_kg("key", "value")
        assert cache.get_kg("key") is None

        cache.set_embedding("key", [1.0])
        assert cache.get_embedding("key") is None


# ---------------------------------------------------------------------------
# make_cache_key
# ---------------------------------------------------------------------------


class TestMakeCacheKey:
    """缓存 key 生成测试。"""

    def test_deterministic(self):
        key1 = make_cache_key("fulltext", "graph-1", "hello", 10)
        key2 = make_cache_key("fulltext", "graph-1", "hello", 10)
        assert key1 == key2

    def test_different_args_different_keys(self):
        key1 = make_cache_key("fulltext", "graph-1", "hello", 10)
        key2 = make_cache_key("fulltext", "graph-1", "world", 10)
        assert key1 != key2

    def test_order_matters(self):
        key1 = make_cache_key("a", "b")
        key2 = make_cache_key("b", "a")
        assert key1 != key2

    def test_handles_unicode(self):
        key = make_cache_key("用户行为数据", "图谱")
        assert len(key) == 64  # SHA-256 hex digest

    def test_handles_list_args(self):
        key = make_cache_key("subgraph", ["id-1", "id-2"], 2)
        assert len(key) == 64