"""Tests for nexus.mempalace.searcher and nexus.mempalace.config."""

from __future__ import annotations

import os
from pathlib import Path
from unittest.mock import MagicMock, patch

import pytest

from nexus.mempalace.config import CORE_ROOMS, MEMPALACE_PATH, COLLECTION_NAME
from nexus.mempalace.searcher import (
    MemPalaceResult,
    MemPalaceUnavailable,
    _get_client,
    search_memories,
    add_memory,
)


# ── MemPalaceResult ──────────────────────────────────────────────────────────


def test_result_short_truncates():
    r = MemPalaceResult(text="x" * 300, room="forge", wing="bezalel")
    short = r.short(200)
    assert len(short) <= 204  # 200 + ellipsis
    assert short.endswith("…")


def test_result_short_no_truncation_needed():
    r = MemPalaceResult(text="hello", room="nexus", wing="bezalel")
    assert r.short() == "hello"


def test_result_defaults():
    r = MemPalaceResult(text="test", room="general", wing="")
    assert r.score == 0.0
    assert r.source_file == ""
    assert r.metadata == {}


# ── Config ───────────────────────────────────────────────────────────────────


def test_core_rooms_contains_required_rooms():
    required = {"forge", "hermes", "nexus", "issues", "experiments"}
    assert required.issubset(set(CORE_ROOMS))


def test_mempalace_path_env_override(monkeypatch, tmp_path):
    monkeypatch.setenv("MEMPALACE_PATH", str(tmp_path))
    # Re-import to pick up env var (config reads at import time so we patch)
    import importlib
    import nexus.mempalace.config as cfg
    importlib.reload(cfg)
    assert Path(os.environ["MEMPALACE_PATH"]) == tmp_path
    importlib.reload(cfg)  # restore


# ── _get_client ──────────────────────────────────────────────────────────────


def test_get_client_raises_when_chromadb_missing(tmp_path):
    with patch.dict("sys.modules", {"chromadb": None}):
        with pytest.raises(MemPalaceUnavailable, match="ChromaDB"):
            _get_client(tmp_path)


def test_get_client_raises_when_path_missing(tmp_path):
    missing = tmp_path / "nonexistent_palace"
    # chromadb importable but path missing
    mock_chroma = MagicMock()
    with patch.dict("sys.modules", {"chromadb": mock_chroma}):
        with pytest.raises(MemPalaceUnavailable, match="Palace directory"):
            _get_client(missing)


# ── search_memories ──────────────────────────────────────────────────────────


def _make_mock_collection(docs, metas=None, distances=None):
    """Build a mock ChromaDB collection that returns canned results."""
    if metas is None:
        metas = [{"room": "forge", "wing": "bezalel", "source_file": ""} for _ in docs]
    if distances is None:
        distances = [0.1 * i for i in range(len(docs))]

    collection = MagicMock()
    collection.query.return_value = {
        "documents": [docs],
        "metadatas": [metas],
        "distances": [distances],
    }
    return collection


def _mock_chroma_client(collection):
    client = MagicMock()
    client.get_or_create_collection.return_value = collection
    return client


def test_search_memories_returns_results(tmp_path):
    docs = ["CI pipeline failed on main", "Forge build log 2026-04-01"]
    collection = _make_mock_collection(docs)
    mock_chroma = MagicMock()
    mock_chroma.PersistentClient.return_value = _mock_chroma_client(collection)

    with patch.dict("sys.modules", {"chromadb": mock_chroma}):
        # Palace path must exist for _get_client check
        (tmp_path / "chroma.sqlite3").touch()
        results = search_memories("CI failures", palace_path=tmp_path)

    assert len(results) == 2
    assert results[0].room == "forge"
    assert results[0].wing == "bezalel"
    assert "CI pipeline" in results[0].text


def test_search_memories_empty_collection(tmp_path):
    collection = MagicMock()
    collection.query.return_value = {"documents": [[]], "metadatas": [[]], "distances": [[]]}
    mock_chroma = MagicMock()
    mock_chroma.PersistentClient.return_value = _mock_chroma_client(collection)

    with patch.dict("sys.modules", {"chromadb": mock_chroma}):
        (tmp_path / "chroma.sqlite3").touch()
        results = search_memories("anything", palace_path=tmp_path)

    assert results == []


def test_search_memories_with_wing_filter(tmp_path):
    docs = ["test doc"]
    collection = _make_mock_collection(docs)
    mock_chroma = MagicMock()
    mock_chroma.PersistentClient.return_value = _mock_chroma_client(collection)

    with patch.dict("sys.modules", {"chromadb": mock_chroma}):
        (tmp_path / "chroma.sqlite3").touch()
        search_memories("query", palace_path=tmp_path, wing="bezalel")

    call_kwargs = collection.query.call_args[1]
    assert call_kwargs["where"] == {"wing": "bezalel"}


def test_search_memories_with_room_filter(tmp_path):
    collection = _make_mock_collection(["doc"])
    mock_chroma = MagicMock()
    mock_chroma.PersistentClient.return_value = _mock_chroma_client(collection)

    with patch.dict("sys.modules", {"chromadb": mock_chroma}):
        (tmp_path / "chroma.sqlite3").touch()
        search_memories("query", palace_path=tmp_path, room="forge")

    call_kwargs = collection.query.call_args[1]
    assert call_kwargs["where"] == {"room": "forge"}


def test_search_memories_unavailable(tmp_path):
    with patch.dict("sys.modules", {"chromadb": None}):
        with pytest.raises(MemPalaceUnavailable):
            search_memories("anything", palace_path=tmp_path)


# ── add_memory ───────────────────────────────────────────────────────────────


def test_add_memory_returns_id(tmp_path):
    collection = MagicMock()
    mock_chroma = MagicMock()
    mock_chroma.PersistentClient.return_value = _mock_chroma_client(collection)

    with patch.dict("sys.modules", {"chromadb": mock_chroma}):
        (tmp_path / "chroma.sqlite3").touch()
        doc_id = add_memory(
            "We decided to use ChromaDB.",
            room="hall_facts",
            wing="bezalel",
            palace_path=tmp_path,
        )

    assert isinstance(doc_id, str)
    assert len(doc_id) == 36  # UUID format
    collection.add.assert_called_once()
    call_kwargs = collection.add.call_args[1]
    assert call_kwargs["documents"] == ["We decided to use ChromaDB."]
    assert call_kwargs["metadatas"][0]["room"] == "hall_facts"
    assert call_kwargs["metadatas"][0]["wing"] == "bezalel"