"""Memory evidence 组装与检索契约（纯函数 / 无 DB）。"""

import pytest

from app.features.memory import evidence as evidence_mod
from app.features.memory.evidence import (
    EMPTY_EVIDENCE_BUNDLE,
    _facts_to_dicts,
    _stories_to_dicts,
    retrieve_evidence_bundle_async,
)
from app.features.memory.evidence_format import format_evidence_chunks_for_chat_prompt
from app.features.memory.schemas import EvidenceBundle


def test_empty_evidence_bundle_keys() -> None:
    assert set(EMPTY_EVIDENCE_BUNDLE.keys()) == {
        "relevant_chunks",
        "relevant_summaries",
        "relevant_facts",
        "relevant_stories",
    }


def test_evidence_bundle_model_accepts_dict() -> None:
    b = EvidenceBundle.model_validate(EMPTY_EVIDENCE_BUNDLE)
    assert b.relevant_chunks == []


def test_format_helpers_empty() -> None:
    assert _facts_to_dicts([]) == []
    assert _stories_to_dicts([]) == []


def test_format_evidence_chunks_for_chat_prompt_reframes_and_labels() -> None:
    evidence = {
        "relevant_chunks": [
            {"id": "chunk-1", "content": "我小时候在河边长大，夏天常去玩水。"},
        ],
        "relevant_summaries": [],
        "relevant_facts": [],
        "relevant_stories": [],
    }
    text = format_evidence_chunks_for_chat_prompt(evidence)
    assert "聊天专用" in text
    assert "归因" in text
    assert "[M1]" in text
    assert "用户曾说" in text
    assert "我小时候在河边长大" in text


def test_slice_interview_memory_empty_bundle():
    from app.features.memory.chat_memory_injection import slice_interview_memory

    s = slice_interview_memory(None, "你好")
    assert s.prompt_excerpt == ""
    assert s.anchor_source == ""
    assert s.planner_preview == ""
    assert s.had_retrieval is False


def test_slice_interview_memory_retrieval_not_equal_inject_dismissive():
    """有检索预览但 gating 后不进主 prompt / anchor。"""
    from app.features.memory.chat_memory_injection import slice_interview_memory

    evidence = {
        "relevant_chunks": [
            {"id": "c1", "content": "很久以前在校园礼堂排练到很晚。"},
        ],
        "relevant_summaries": [],
        "relevant_facts": [],
        "relevant_stories": [],
    }
    s = slice_interview_memory(evidence, "哈哈，早就不会了")
    assert s.prompt_excerpt == ""
    assert s.anchor_source == ""
    assert s.planner_preview.strip() != ""
    assert s.had_retrieval is True


def test_slice_interview_memory_minimal_inject_when_aligned():
    from app.features.memory.chat_memory_injection import slice_interview_memory

    evidence = {
        "relevant_chunks": [
            {"id": "c1", "content": "你在校园演出里饰演罗密欧。"},
        ],
        "relevant_summaries": [],
        "relevant_facts": [],
        "relevant_stories": [],
    }
    s = slice_interview_memory(evidence, "那次排练其实挺紧张的，灯光一打我就忘词。")
    assert "记忆线索" in s.prompt_excerpt
    assert "校园演出" in s.prompt_excerpt or "罗密欧" in s.prompt_excerpt
    assert s.anchor_source
    assert s.had_retrieval is True


def test_slice_interview_memory_keeps_first_person_but_marks_ownership():
    from app.features.memory.chat_memory_injection import slice_interview_memory

    evidence = {
        "relevant_chunks": [
            {"id": "c1", "content": "我小时候在河边长大，夏天常去玩水。"},
        ],
        "relevant_summaries": [],
        "relevant_facts": [],
        "relevant_stories": [],
    }
    s = slice_interview_memory(evidence, "那条河一到夏天就特别热闹，我现在都记得。")
    assert "用户曾说" in s.prompt_excerpt
    assert "我小时候在河边长大" in s.prompt_excerpt
    assert s.anchor_source.startswith("用户曾说")


def test_slice_interview_memory_suppresses_long_new_topic():
    from app.features.memory.chat_memory_injection import slice_interview_memory

    evidence = {
        "relevant_chunks": [
            {"id": "c1", "content": "旧记忆关于河边。"},
        ],
        "relevant_summaries": [],
        "relevant_facts": [],
        "relevant_stories": [],
    }
    long_msg = "我今天想随便聊聊工作里的事，项目压力很大。" * 6
    assert len(long_msg) > 72
    s = slice_interview_memory(evidence, long_msg)
    assert s.prompt_excerpt == ""
    assert s.anchor_source == ""


async def test_retrieve_evidence_bundle_async_non_empty_merges_precomputed_chunks(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    """非空 query：异步路径以 merged_chunk_dicts 为主，元数据来自 fetch_evidence_metadata_async。"""
    meta = {
        "relevant_facts": [
            {
                "id": "f1",
                "fact_type": "bio",
                "subject": "s",
                "predicate": "p",
                "object_json": {},
            }
        ],
        "relevant_summaries": [
            {
                "id": "s1",
                "summary_type": "session",
                "content": "sum",
                "source_chunk_ids": [],
            }
        ],
        "relevant_stories": [],
    }

    async def fake_fetch_meta(db, user_id, q, top_k):
        assert user_id == "u1"
        assert q == "hello"
        assert top_k == 7
        return meta

    monkeypatch.setattr(evidence_mod, "fetch_evidence_metadata_async", fake_fetch_meta)
    merged = [{"id": "c1", "content": "chunk body", "chunk_index": 0}]
    out = await retrieve_evidence_bundle_async(
        object(),
        "u1",
        "  hello  ",
        top_k=7,
        merged_chunk_dicts=merged,
    )
    assert out == {"relevant_chunks": merged, **meta}


async def test_empty_query_evidence_bundle_async_returns_empty() -> None:
    out_a = await retrieve_evidence_bundle_async(
        object(),
        "u1",
        "   ",
        top_k=10,
        merged_chunk_dicts=[],
    )
    assert out_a == dict(EMPTY_EVIDENCE_BUNDLE)