"""Opt-in external tests for real document image transcription."""

import os
from pathlib import Path

import pytest

from transcription.services.transcription import transcribe_document_image

HAS_OPENROUTER_KEY = bool(os.getenv("OPENROUTER_API_KEY"))

REAL_IMAGES_DIR = Path(__file__).resolve().parents[1] / "fixtures" / "images" / "real"
ARTIFACTS_DIR = Path(__file__).resolve().parents[1] / "artifacts" / "transcriptions"
SUPPORTED_EXTENSIONS = {".jpg", ".jpeg", ".png", ".tif", ".tiff", ".pdf"}

pytestmark = [
    pytest.mark.external,
    pytest.mark.skipif(
        not HAS_OPENROUTER_KEY,
        reason="Set OPENROUTER_API_KEY to run external real-image tests.",
    ),
]


def _real_image_paths() -> list[Path]:
    if not REAL_IMAGES_DIR.exists():
        return []
    return sorted(
        [
            p
            for p in REAL_IMAGES_DIR.iterdir()
            if p.is_file() and p.suffix.lower() in SUPPORTED_EXTENSIONS
        ]
    )


def _artifact_filename(image_path: Path) -> str:
    safe_stem = image_path.stem.replace(" ", "_")
    safe_suffix = image_path.suffix.lower().replace(".", "")
    return f"{safe_stem}.{safe_suffix}.txt"


class TestRealImageExternalTranscription:
    """Validate transcription against real local fixtures via live provider."""

    def test_real_image_fixture_set_exists(self):
        """At least one supported real-image fixture exists for external tests."""
        assert REAL_IMAGES_DIR.exists()
        assert _real_image_paths()

    @pytest.mark.parametrize("image_path", _real_image_paths(), ids=lambda p: p.name)
    def test_transcribes_real_image_fixture(self, image_path: Path):
        """Real fixture image produces a non-empty transcription result."""
        result = transcribe_document_image(image_path)
        assert result.provider == "openrouter"
        assert isinstance(result.model, str) and result.model.strip()
        assert isinstance(result.text, str) and result.text.strip()

        ARTIFACTS_DIR.mkdir(parents=True, exist_ok=True)
        artifact_path = ARTIFACTS_DIR / _artifact_filename(image_path)
        artifact_text = (
            f"source: {image_path.name}\n"
            f"provider: {result.provider}\n"
            f"model: {result.model}\n"
            "---\n"
            f"{result.text}\n"
        )
        artifact_path.write_text(artifact_text, encoding="utf-8")
        assert artifact_path.exists()