import pytest
import os
from pathlib import Path


def test_config_loads_from_env(tmp_path, monkeypatch):
    env_file = tmp_path / ".env"
    env_file.write_text(
        "LLM_BASE_URL=https://openrouter.ai/api/v1\n"
        "LLM_API_KEY=test_key_123\n"
        "LLM_MODEL_NAME=qwen/qwen3.5-35b-a3b\n"
        "EMBEDDING_MODEL=qwen/qwen3-embedding-4b\n"
        "EMBEDDING_BASE_URL=https://openrouter.ai/api/v1\n"
        "CHROMA_DB_PATH=./test_chroma\n"
    )
    
    monkeypatch.chdir(tmp_path)
    from app.core.config import Settings
    
    settings = Settings()
    assert settings.llm_base_url == "https://openrouter.ai/api/v1"
    assert settings.llm_api_key == "test_key_123"
    assert settings.llm_model_name == "qwen/qwen3.5-35b-a3b"
    assert settings.chroma_db_path == "./test_chroma"


def test_config_default_values(monkeypatch):
    monkeypatch.delenv("LLM_BASE_URL", raising=False)
    from app.core.config import Settings
    
    settings = Settings()
    assert settings.llm_base_url == "https://openrouter.ai/api/v1"
    assert settings.llm_model_name == "qwen/qwen3.5-35b-a3b"


def test_qa_chunking_config_defaults(monkeypatch):
    """Phase 8.0: Q&A chunking config fields have correct defaults."""
    monkeypatch.delenv("DEFAULT_CHUNKING_STRATEGY", raising=False)
    monkeypatch.delenv("QA_VISION_ENABLED", raising=False)
    monkeypatch.delenv("QA_MAX_CHUNK_TOKENS", raising=False)
    monkeypatch.delenv("QA_STRUCTURE_MODEL", raising=False)
    monkeypatch.delenv("QA_INCLUDE_INTERNAL_REFS", raising=False)
    monkeypatch.delenv("QA_CACHE_VISION_RESULTS", raising=False)

    from app.core.config import Settings

    settings = Settings()
    assert settings.default_chunking_strategy == "token"
    assert settings.qa_vision_enabled is True
    assert settings.qa_max_chunk_tokens == 3000
    assert settings.qa_structure_model == ""
    assert settings.qa_include_internal_refs is True
    assert settings.qa_cache_vision_results is True


def test_qa_chunking_config_from_env(tmp_path, monkeypatch):
    """Phase 8.0: Q&A chunking config fields load from .env."""
    env_file = tmp_path / ".env"
    env_file.write_text(
        "DEFAULT_CHUNKING_STRATEGY=question\n"
        "QA_VISION_ENABLED=false\n"
        "QA_MAX_CHUNK_TOKENS=5000\n"
        "QA_STRUCTURE_MODEL=anthropic/claude-3-haiku\n"
        "QA_INCLUDE_INTERNAL_REFS=false\n"
        "QA_CACHE_VISION_RESULTS=false\n"
    )

    monkeypatch.chdir(tmp_path)
    from app.core.config import Settings

    settings = Settings()
    assert settings.default_chunking_strategy == "question"
    assert settings.qa_vision_enabled is False
    assert settings.qa_max_chunk_tokens == 5000
    assert settings.qa_structure_model == "anthropic/claude-3-haiku"
    assert settings.qa_include_internal_refs is False
    assert settings.qa_cache_vision_results is False