# Unit tests for VocabularyCache.infer_competences with mocked LLM client.
#
# **Validates: Requirements 2.1, 2.2, 2.3, 2.4, 2.5**

from __future__ import annotations

import json
import logging

import pytest

from teamlandkarte_mcp.matching.vocabulary import VocabularyCache


# ---------------------------------------------------------------------------
# Fakes / Stubs
# ---------------------------------------------------------------------------


class FakeDB:
    """Stub DBClient returning a configurable competence list."""

    def __init__(self, competences: list[str] | None = None) -> None:
        self._competences = competences if competences is not None else []

    def get_all_competence_names(self) -> list[str]:
        return self._competences

    def get_all_role_names(self) -> list[str]:
        return ["Software Engineer"]


class FakeLLMClient:
    """Stub AzureOpenAIClient that returns a pre-configured response."""

    def __init__(self, response: str | Exception) -> None:
        self._response = response

    async def chat_completion(self, system: str, user: str) -> str:
        if isinstance(self._response, Exception):
            raise self._response
        return self._response


# ---------------------------------------------------------------------------
# Tests
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_valid_json_response_returns_correct_tuples() -> None:
    """Valid JSON response from LLM → correct list of (name, confidence) tuples."""
    competences = ["Python", "TypeScript", "React", "Docker"]
    llm_response = json.dumps(
        {
            "competences": [
                {"name": "Python", "confidence": 0.95},
                {"name": "React", "confidence": 0.8},
            ]
        }
    )
    db = FakeDB(competences=competences)
    client = FakeLLMClient(response=llm_response)
    cache = VocabularyCache(db=db, client=client)  # type: ignore[arg-type]

    result = await cache.infer_competences(task_text="Build a Python backend")

    assert result == [("Python", 0.95), ("React", 0.8)]


@pytest.mark.asyncio
async def test_empty_task_text_returns_empty_list() -> None:
    """Empty task text → []."""
    competences = ["Python", "TypeScript"]
    llm_response = json.dumps({"competences": [{"name": "Python", "confidence": 0.9}]})
    db = FakeDB(competences=competences)
    client = FakeLLMClient(response=llm_response)
    cache = VocabularyCache(db=db, client=client)  # type: ignore[arg-type]

    assert await cache.infer_competences(task_text="") == []
    assert await cache.infer_competences(task_text="   ") == []


@pytest.mark.asyncio
async def test_empty_competence_list_in_db_returns_empty_list() -> None:
    """Empty competence list in DB → []."""
    llm_response = json.dumps({"competences": [{"name": "Python", "confidence": 0.9}]})
    db = FakeDB(competences=[])
    client = FakeLLMClient(response=llm_response)
    cache = VocabularyCache(db=db, client=client)  # type: ignore[arg-type]

    result = await cache.infer_competences(task_text="Build a Python backend")

    assert result == []


@pytest.mark.asyncio
async def test_llm_error_returns_empty_list_and_logs_warning(
    caplog: pytest.LogCaptureFixture,
) -> None:
    """LLM error (Exception) → [] + warning logged."""
    competences = ["Python", "TypeScript"]
    db = FakeDB(competences=competences)
    client = FakeLLMClient(response=RuntimeError("API timeout"))
    cache = VocabularyCache(db=db, client=client)  # type: ignore[arg-type]

    with caplog.at_level(logging.WARNING):
        result = await cache.infer_competences(task_text="Build a Python backend")

    assert result == []
    assert any("LLM call failed" in record.message for record in caplog.records)


@pytest.mark.asyncio
async def test_invalid_json_response_returns_empty_list(
    caplog: pytest.LogCaptureFixture,
) -> None:
    """Invalid JSON response → [] (json.loads raises, caught by except)."""
    competences = ["Python", "TypeScript"]
    db = FakeDB(competences=competences)
    client = FakeLLMClient(response="this is not valid json {{{")
    cache = VocabularyCache(db=db, client=client)  # type: ignore[arg-type]

    with caplog.at_level(logging.WARNING):
        result = await cache.infer_competences(task_text="Build a Python backend")

    assert result == []
    assert any("LLM call failed" in record.message for record in caplog.records)


@pytest.mark.asyncio
async def test_unknown_competence_names_are_filtered_out() -> None:
    """Competence names not in DB → filtered out."""
    competences = ["Python", "TypeScript", "React"]
    llm_response = json.dumps(
        {
            "competences": [
                {"name": "Python", "confidence": 0.9},
                {"name": "Rust", "confidence": 0.85},  # not in DB
                {"name": "Go", "confidence": 0.7},  # not in DB
                {"name": "React", "confidence": 0.6},
            ]
        }
    )
    db = FakeDB(competences=competences)
    client = FakeLLMClient(response=llm_response)
    cache = VocabularyCache(db=db, client=client)  # type: ignore[arg-type]

    result = await cache.infer_competences(task_text="Build a backend service")

    assert result == [("Python", 0.9), ("React", 0.6)]


@pytest.mark.asyncio
async def test_max_competences_limited_to_10() -> None:
    """Result is limited to max_competences (default 10)."""
    # Create 15 competences and have the LLM return all of them
    competences = [f"Competence_{i}" for i in range(15)]
    llm_response = json.dumps(
        {
            "competences": [
                {"name": name, "confidence": round(0.5 + i * 0.03, 2)}
                for i, name in enumerate(competences)
            ]
        }
    )
    db = FakeDB(competences=competences)
    client = FakeLLMClient(response=llm_response)
    cache = VocabularyCache(db=db, client=client)  # type: ignore[arg-type]

    result = await cache.infer_competences(task_text="A complex task")

    assert len(result) == 10
    # All returned names must be in the DB list
    for name, confidence in result:
        assert name in competences
        assert 0.0 <= confidence <= 1.0


@pytest.mark.asyncio
async def test_confidence_clamped_to_valid_range() -> None:
    """Confidence values outside [0.0, 1.0] are clamped."""
    competences = ["Python", "TypeScript"]
    llm_response = json.dumps(
        {
            "competences": [
                {"name": "Python", "confidence": 1.5},  # above 1.0
                {"name": "TypeScript", "confidence": -0.3},  # below 0.0
            ]
        }
    )
    db = FakeDB(competences=competences)
    client = FakeLLMClient(response=llm_response)
    cache = VocabularyCache(db=db, client=client)  # type: ignore[arg-type]

    result = await cache.infer_competences(task_text="Build something")

    assert result == [("Python", 1.0), ("TypeScript", 0.0)]