"""Tests for the GenAI + OCR factories (Task 4.3).

The factories pick between fake and real clients based on
``IX_TEST_MODE``. CI runs with ``IX_TEST_MODE=fake``, production runs
without — so the selection knob is the one lever between hermetic CI and
real clients.
"""

from __future__ import annotations

from ix.config import AppConfig
from ix.genai import make_genai_client
from ix.genai.fake import FakeGenAIClient
from ix.genai.ollama_client import OllamaClient
from ix.ocr import make_ocr_client
from ix.ocr.fake import FakeOCRClient
from ix.ocr.surya_client import SuryaOCRClient


def _cfg(**overrides: object) -> AppConfig:
    """Build an AppConfig without loading the repo's .env.example."""
    return AppConfig(_env_file=None, **overrides)  # type: ignore[call-arg]


class TestGenAIFactory:
    def test_fake_mode_returns_fake(self) -> None:
        cfg = _cfg(test_mode="fake")
        client = make_genai_client(cfg)
        assert isinstance(client, FakeGenAIClient)

    def test_production_returns_ollama_with_configured_url(self) -> None:
        cfg = _cfg(
            test_mode=None,
            ollama_url="http://ollama.host:11434",
            genai_call_timeout_seconds=42,
        )
        client = make_genai_client(cfg)
        assert isinstance(client, OllamaClient)
        # Inspect the private attrs for binding correctness.
        assert client._base_url == "http://ollama.host:11434"
        assert client._per_call_timeout_s == 42


class TestOCRFactory:
    def test_fake_mode_returns_fake(self) -> None:
        cfg = _cfg(test_mode="fake")
        client = make_ocr_client(cfg)
        assert isinstance(client, FakeOCRClient)

    def test_production_surya_returns_surya(self) -> None:
        cfg = _cfg(test_mode=None, ocr_engine="surya")
        client = make_ocr_client(cfg)
        assert isinstance(client, SuryaOCRClient)

    def test_unknown_engine_raises(self) -> None:
        cfg = _cfg(test_mode=None, ocr_engine="tesseract")
        import pytest

        with pytest.raises(ValueError, match="ocr_engine"):
            make_ocr_client(cfg)