"""Tests for retouch module: upload, process, results, and price comparison with mocked OpenRouter."""

import uuid
from unittest.mock import AsyncMock, MagicMock, patch

import pytest
import pytest_asyncio
from httpx import AsyncClient
from sqlalchemy.ext.asyncio import AsyncSession

from app.models.retouch import RetouchStatus
from app.models.vehicle import Vehicle
from app.services import retouch_service, price_compare_service

# Ensure all models are registered with Base.metadata
from app.models import user, vehicle, retouch  # noqa: F401


@pytest_asyncio.fixture
async def test_vehicle(db_session: AsyncSession) -> Vehicle:
    """Create a test vehicle for retouch linking."""
    v = Vehicle(
        make="Mercedes",
        model="Actros",
        fin="WDB9066351L123456",
        year=2020,
        power_kw=350,
        fuel_type="Diesel",
        condition="used",
        availability="available",
        price=45000,
        vehicle_type="lkw",
        mileage_km=120000,
    )
    db_session.add(v)
    await db_session.commit()
    await db_session.refresh(v)
    return v


def _fake_image(size: int = 1024) -> bytes:
    """Generate fake image bytes for testing."""
    return b"\x89PNG\r\n\x1a\n" + b"\x00" * (size - 8)


class TestRetouchService:
    """Unit tests for retouch_service functions."""

    @pytest.mark.asyncio
    async def test_validate_mime_type_valid(self):
        assert retouch_service.validate_mime_type("image/png") is True
        assert retouch_service.validate_mime_type("image/jpeg") is True
        assert retouch_service.validate_mime_type("image/webp") is True

    @pytest.mark.asyncio
    async def test_validate_mime_type_invalid(self):
        assert retouch_service.validate_mime_type("application/pdf") is False
        assert retouch_service.validate_mime_type("text/plain") is False
        assert retouch_service.validate_mime_type("") is False

    @pytest.mark.asyncio
    async def test_validate_file_size_valid(self):
        assert retouch_service.validate_file_size(1024 * 1024) is True

    @pytest.mark.asyncio
    async def test_validate_file_size_too_large(self):
        assert retouch_service.validate_file_size(51 * 1024 * 1024) is False

    @pytest.mark.asyncio
    async def test_generate_retouch_prompt_default(self):
        prompt = retouch_service.generate_retouch_prompt()
        assert "background" in prompt.lower()
        assert "color" in prompt.lower()

    @pytest.mark.asyncio
    async def test_generate_retouch_prompt_with_vehicle_info(self):
        info = {"make": "Mercedes", "model": "Actros", "color": "red"}
        prompt = retouch_service.generate_retouch_prompt(info)
        assert "Mercedes" in prompt
        assert "Actros" in prompt
        assert "red" in prompt

    @pytest.mark.asyncio
    async def test_upload_retouch_file_success(
        self, db_session: AsyncSession, tmp_path
    ):
        with patch.object(retouch_service.settings, "UPLOAD_DIR", str(tmp_path)):
            result = await retouch_service.upload_retouch_file(
                db=db_session,
                file_bytes=_fake_image(),
                file_name="truck.png",
                mime_type="image/png",
            )
            assert result.id is not None
            assert result.status == RetouchStatus.pending.value
            assert result.original_file_name == "truck.png"
            assert result.original_file_path.endswith(".png")

    @pytest.mark.asyncio
    async def test_upload_retouch_file_invalid_mime(self, db_session: AsyncSession):
        with pytest.raises(ValueError, match="Invalid MIME type"):
            await retouch_service.upload_retouch_file(
                db=db_session,
                file_bytes=b"data",
                file_name="doc.pdf",
                mime_type="application/pdf",
            )

    @pytest.mark.asyncio
    async def test_upload_retouch_file_too_large(self, db_session: AsyncSession):
        large = b"x" * (51 * 1024 * 1024)
        with pytest.raises(ValueError, match="File size exceeds"):
            await retouch_service.upload_retouch_file(
                db=db_session,
                file_bytes=large,
                file_name="big.png",
                mime_type="image/png",
            )

    @pytest.mark.asyncio
    async def test_get_result_not_found(self, db_session: AsyncSession):
        result = await retouch_service.get_result(db_session, uuid.uuid4())
        assert result is None

    @pytest.mark.asyncio
    async def test_list_results_empty(self, db_session: AsyncSession):
        items, total = await retouch_service.list_results(db_session)
        assert total == 0
        assert items == []

    @pytest.mark.asyncio
    async def test_list_results_with_data(self, db_session: AsyncSession, tmp_path):
        with patch.object(retouch_service.settings, "UPLOAD_DIR", str(tmp_path)):
            await retouch_service.upload_retouch_file(
                db=db_session,
                file_bytes=_fake_image(),
                file_name="img1.png",
                mime_type="image/png",
            )
            await retouch_service.upload_retouch_file(
                db=db_session,
                file_bytes=_fake_image(),
                file_name="img2.png",
                mime_type="image/png",
            )
            await db_session.commit()
        items, total = await retouch_service.list_results(db_session)
        assert total == 2
        assert len(items) == 2

    @pytest.mark.asyncio
    async def test_list_results_filter_by_vehicle(
        self, db_session: AsyncSession, test_vehicle: Vehicle, tmp_path
    ):
        with patch.object(retouch_service.settings, "UPLOAD_DIR", str(tmp_path)):
            await retouch_service.upload_retouch_file(
                db=db_session,
                file_bytes=_fake_image(),
                file_name="img1.png",
                mime_type="image/png",
                vehicle_id=test_vehicle.id,
            )
            await retouch_service.upload_retouch_file(
                db=db_session,
                file_bytes=_fake_image(),
                file_name="img2.png",
                mime_type="image/png",
            )
            await db_session.commit()
        items, total = await retouch_service.list_results(
            db_session, vehicle_id=test_vehicle.id
        )
        assert total == 1
        assert len(items) == 1
        assert items[0].vehicle_id == test_vehicle.id

    @pytest.mark.asyncio
    async def test_process_retouch_success(self, db_session: AsyncSession, tmp_path):
        """Test process_retouch with mocked Flux.1-Pro call."""
        with patch.object(retouch_service.settings, "UPLOAD_DIR", str(tmp_path)):
            result = await retouch_service.upload_retouch_file(
                db=db_session,
                file_bytes=_fake_image(),
                file_name="truck.png",
                mime_type="image/png",
            )
            await db_session.commit()

            # Mock the _call_flux_pro function to return fake retouched bytes
            retouched_bytes = b"\x89PNG\r\n\x1a\n" + b"\xff" * 1016
            with patch.object(
                retouch_service,
                "_call_flux_pro",
                new_callable=AsyncMock,
                return_value=retouched_bytes,
            ):
                processed = await retouch_service.process_retouch(db_session, result.id)
                await db_session.commit()

            assert processed.status == RetouchStatus.completed.value
            assert processed.retouched_file_path is not None
            assert processed.error_message is None
            assert processed.retouched_file_path.endswith(".png")

    @pytest.mark.asyncio
    async def test_process_retouch_failure(self, db_session: AsyncSession, tmp_path):
        """Test process_retouch sets failed status on OpenRouter error."""
        with patch.object(retouch_service.settings, "UPLOAD_DIR", str(tmp_path)):
            result = await retouch_service.upload_retouch_file(
                db=db_session,
                file_bytes=_fake_image(),
                file_name="truck.png",
                mime_type="image/png",
            )
            await db_session.commit()

            with patch.object(
                retouch_service,
                "_call_flux_pro",
                new_callable=AsyncMock,
                side_effect=Exception("OpenRouter unavailable"),
            ):
                processed = await retouch_service.process_retouch(db_session, result.id)
                await db_session.commit()

            assert processed.status == RetouchStatus.failed.value
            assert processed.error_message is not None
            assert "OpenRouter unavailable" in processed.error_message
            assert processed.retouched_file_path is None

    @pytest.mark.asyncio
    async def test_process_retouch_not_found(self, db_session: AsyncSession):
        """Test process_retouch raises ValueError for non-existent result."""
        with pytest.raises(ValueError, match="not found"):
            await retouch_service.process_retouch(db_session, uuid.uuid4())

    @pytest.mark.asyncio
    async def test_call_flux_pro_no_api_key(self):
        """Test _call_flux_pro raises ValueError when no API key configured."""
        with patch.object(retouch_service.settings, "OPENROUTER_API_KEY", ""):
            with pytest.raises(
                ValueError, match="OPENROUTER_API_KEY is not configured"
            ):
                await retouch_service._call_flux_pro(
                    image_bytes=b"fake-image",
                    mime_type="image/png",
                    prompt="test prompt",
                )

    @pytest.mark.asyncio
    async def test_call_flux_pro_success_data_uri(
        self, db_session: AsyncSession, tmp_path
    ):
        """Test _call_flux_pro with mocked httpx returning base64 data URI."""
        import base64 as b64mod

        retouched = b"\x89PNG\r\n\x1a\nretouched-data"
        b64_retouched = b64mod.b64encode(retouched).decode("utf-8")

        mock_response = MagicMock()
        mock_response.raise_for_status = MagicMock()
        mock_response.json.return_value = {
            "choices": [
                {"message": {"content": f"data:image/png;base64,{b64_retouched}"}}
            ]
        }

        mock_client = AsyncMock()
        mock_client.post = AsyncMock(return_value=mock_response)
        mock_client.__aenter__ = AsyncMock(return_value=mock_client)
        mock_client.__aexit__ = AsyncMock(return_value=None)

        with patch.object(retouch_service.settings, "OPENROUTER_API_KEY", "test-key"):
            with patch(
                "app.services.retouch_service.httpx.AsyncClient",
                return_value=mock_client,
            ):
                result = await retouch_service._call_flux_pro(
                    image_bytes=b"fake-image",
                    mime_type="image/png",
                    prompt="test prompt",
                )
                assert result == retouched

    @pytest.mark.asyncio
    async def test_call_flux_pro_success_list_content(
        self, db_session: AsyncSession, tmp_path
    ):
        """Test _call_flux_pro with content as list of parts."""
        import base64 as b64mod

        retouched = b"\x89PNG\r\n\x1a\nlist-content"
        b64_retouched = b64mod.b64encode(retouched).decode("utf-8")

        mock_response = MagicMock()
        mock_response.raise_for_status = MagicMock()
        mock_response.json.return_value = {
            "choices": [
                {
                    "message": {
                        "content": [
                            {"type": "text", "text": "Here is the image"},
                            {
                                "type": "image_url",
                                "image_url": {
                                    "url": f"data:image/png;base64,{b64_retouched}"
                                },
                            },
                        ]
                    }
                }
            ]
        }

        mock_client = AsyncMock()
        mock_client.post = AsyncMock(return_value=mock_response)
        mock_client.__aenter__ = AsyncMock(return_value=mock_client)
        mock_client.__aexit__ = AsyncMock(return_value=None)

        with patch.object(retouch_service.settings, "OPENROUTER_API_KEY", "test-key"):
            with patch(
                "app.services.retouch_service.httpx.AsyncClient",
                return_value=mock_client,
            ):
                result = await retouch_service._call_flux_pro(
                    image_bytes=b"fake-image",
                    mime_type="image/png",
                    prompt="test prompt",
                )
                assert result == retouched

    @pytest.mark.asyncio
    async def test_call_flux_pro_fallback_original_bytes(self):
        """Test _call_flux_pro returns original bytes when no image in response."""
        mock_response = MagicMock()
        mock_response.raise_for_status = MagicMock()
        mock_response.json.return_value = {
            "choices": [{"message": {"content": "Sorry, I cannot process this image."}}]
        }

        mock_client = AsyncMock()
        mock_client.post = AsyncMock(return_value=mock_response)
        mock_client.__aenter__ = AsyncMock(return_value=mock_client)
        mock_client.__aexit__ = AsyncMock(return_value=None)

        original = b"original-image-bytes"
        with patch.object(retouch_service.settings, "OPENROUTER_API_KEY", "test-key"):
            with patch(
                "app.services.retouch_service.httpx.AsyncClient",
                return_value=mock_client,
            ):
                result = await retouch_service._call_flux_pro(
                    image_bytes=original,
                    mime_type="image/png",
                    prompt="test prompt",
                )
                assert result == original


class TestPriceCompareService:
    """Unit tests for price_compare_service functions."""

    @pytest.mark.asyncio
    async def test_compare_prices_success(
        self, db_session: AsyncSession, test_vehicle: Vehicle
    ):
        result = await price_compare_service.compare_prices(db_session, test_vehicle.id)
        assert result.vehicle_id == test_vehicle.id
        assert len(result.comparable_listings) > 0
        assert result.average_price is not None
        assert result.listing_count > 0
        # Average should be within reasonable range of vehicle price
        base = float(test_vehicle.price)
        assert base * 0.7 < result.average_price < base * 1.3

    @pytest.mark.asyncio
    async def test_compare_prices_vehicle_not_found(self, db_session: AsyncSession):
        with pytest.raises(ValueError, match="not found"):
            await price_compare_service.compare_prices(db_session, uuid.uuid4())

    @pytest.mark.asyncio
    async def test_compare_prices_listings_have_correct_make_model(
        self, db_session: AsyncSession, test_vehicle: Vehicle
    ):
        result = await price_compare_service.compare_prices(db_session, test_vehicle.id)
        for listing in result.comparable_listings:
            assert listing.make == test_vehicle.make
            assert listing.model == test_vehicle.model
            assert listing.source == "mobile.de"

    @pytest.mark.asyncio
    async def test_compare_prices_average_calculation(
        self, db_session: AsyncSession, test_vehicle: Vehicle
    ):
        result = await price_compare_service.compare_prices(db_session, test_vehicle.id)
        expected_avg = sum(
            listing.price for listing in result.comparable_listings
        ) / len(result.comparable_listings)
        assert abs(result.average_price - round(expected_avg, 2)) < 0.01


class TestRetouchRouter:
    """Integration tests for retouch router endpoints."""

    @pytest.mark.asyncio
    async def test_process_image_success(self, admin_client: AsyncClient, tmp_path):
        """POST /retouch/process with valid image returns 202 + retouch_id."""
        with patch.object(retouch_service.settings, "UPLOAD_DIR", str(tmp_path)):
            with patch(
                "app.routers.image_retouch.run_retouch_processing",
                new_callable=AsyncMock,
            ):
                fake_image = _fake_image()
                response = await admin_client.post(
                    "/api/v1/retouch/process",
                    files={"file": ("truck.png", fake_image, "image/png")},
                )
        assert response.status_code == 202
        data = response.json()
        assert "retouch_id" in data
        assert data["status"] == "pending"
        assert data["message"] == "Retouch processing queued"

    @pytest.mark.asyncio
    async def test_process_image_no_file(self, admin_client: AsyncClient):
        """POST /retouch/process without file returns 422."""
        response = await admin_client.post("/api/v1/retouch/process")
        assert response.status_code == 422

    @pytest.mark.asyncio
    async def test_process_image_invalid_mime(self, admin_client: AsyncClient):
        """POST /retouch/process with invalid MIME returns 422."""
        response = await admin_client.post(
            "/api/v1/retouch/process",
            files={"file": ("doc.pdf", b"fake-pdf-data", "application/pdf")},
        )
        assert response.status_code == 422
        data = response.json()
        assert data["detail"]["error"]["code"] == "INVALID_MIME_TYPE"

    @pytest.mark.asyncio
    async def test_process_image_with_vehicle_id(
        self, admin_client: AsyncClient, test_vehicle: Vehicle, tmp_path
    ):
        """POST /retouch/process with vehicle_id links the result."""
        with patch.object(retouch_service.settings, "UPLOAD_DIR", str(tmp_path)):
            with patch(
                "app.routers.image_retouch.run_retouch_processing",
                new_callable=AsyncMock,
            ):
                response = await admin_client.post(
                    "/api/v1/retouch/process",
                    files={"file": ("truck.png", _fake_image(), "image/png")},
                    data={"vehicle_id": str(test_vehicle.id)},
                )
        assert response.status_code == 202
        data = response.json()
        assert "retouch_id" in data

    @pytest.mark.asyncio
    async def test_get_retouch_result_completed(
        self, admin_client: AsyncClient, db_session: AsyncSession, tmp_path
    ):
        """GET /retouch/results/:id returns 200 with completed status."""
        with patch.object(retouch_service.settings, "UPLOAD_DIR", str(tmp_path)):
            result = await retouch_service.upload_retouch_file(
                db=db_session,
                file_bytes=_fake_image(),
                file_name="truck.png",
                mime_type="image/png",
            )
            result.status = RetouchStatus.completed.value
            result.retouched_file_path = str(tmp_path / "retouched.png")
            await db_session.commit()
            await db_session.refresh(result)

        response = await admin_client.get(f"/api/v1/retouch/results/{result.id}")
        assert response.status_code == 200
        data = response.json()
        assert data["status"] == "completed"
        assert data["retouched_file_path"] is not None

    @pytest.mark.asyncio
    async def test_get_retouch_result_processing(
        self, admin_client: AsyncClient, db_session: AsyncSession, tmp_path
    ):
        """GET /retouch/results/:id before completion returns 200 with processing status."""
        with patch.object(retouch_service.settings, "UPLOAD_DIR", str(tmp_path)):
            result = await retouch_service.upload_retouch_file(
                db=db_session,
                file_bytes=_fake_image(),
                file_name="truck.png",
                mime_type="image/png",
            )
            result.status = RetouchStatus.processing.value
            await db_session.commit()
            await db_session.refresh(result)

        response = await admin_client.get(f"/api/v1/retouch/results/{result.id}")
        assert response.status_code == 200
        data = response.json()
        assert data["status"] == "processing"

    @pytest.mark.asyncio
    async def test_get_retouch_result_failed(
        self, admin_client: AsyncClient, db_session: AsyncSession, tmp_path
    ):
        """GET /retouch/results/:id with failed status returns 200 + error."""
        with patch.object(retouch_service.settings, "UPLOAD_DIR", str(tmp_path)):
            result = await retouch_service.upload_retouch_file(
                db=db_session,
                file_bytes=_fake_image(),
                file_name="truck.png",
                mime_type="image/png",
            )
            result.status = RetouchStatus.failed.value
            result.error_message = "OpenRouter unavailable"
            await db_session.commit()
            await db_session.refresh(result)

        response = await admin_client.get(f"/api/v1/retouch/results/{result.id}")
        assert response.status_code == 200
        data = response.json()
        assert data["status"] == "failed"
        assert data["error_message"] == "OpenRouter unavailable"

    @pytest.mark.asyncio
    async def test_get_retouch_result_not_found(self, admin_client: AsyncClient):
        """GET /retouch/results/:id with non-existent ID returns 404."""
        response = await admin_client.get(f"/api/v1/retouch/results/{uuid.uuid4()}")
        assert response.status_code == 404

    @pytest.mark.asyncio
    async def test_price_compare_success(
        self, admin_client: AsyncClient, test_vehicle: Vehicle
    ):
        """POST /retouch/price-compare with vehicle_id returns 200 + listings."""
        response = await admin_client.post(
            "/api/v1/retouch/price-compare",
            json={"vehicle_id": str(test_vehicle.id)},
        )
        assert response.status_code == 200
        data = response.json()
        assert data["vehicle_id"] == str(test_vehicle.id)
        assert isinstance(data["comparable_listings"], list)
        assert len(data["comparable_listings"]) > 0
        assert data["average_price"] is not None
        assert data["listing_count"] > 0

    @pytest.mark.asyncio
    async def test_price_compare_no_vehicle_id(self, admin_client: AsyncClient):
        """POST /retouch/price-compare without vehicle_id returns 422."""
        response = await admin_client.post(
            "/api/v1/retouch/price-compare",
            json={},
        )
        assert response.status_code == 422

    @pytest.mark.asyncio
    async def test_price_compare_vehicle_not_found(self, admin_client: AsyncClient):
        """POST /retouch/price-compare with non-existent vehicle returns 404."""
        response = await admin_client.post(
            "/api/v1/retouch/price-compare",
            json={"vehicle_id": str(uuid.uuid4())},
        )
        assert response.status_code == 404

    @pytest.mark.asyncio
    async def test_process_image_unauthorized(self, client: AsyncClient):
        """POST /retouch/process without auth returns 401."""
        response = await client.post(
            "/api/v1/retouch/process",
            files={"file": ("truck.png", _fake_image(), "image/png")},
        )
        assert response.status_code == 401

    @pytest.mark.asyncio
    async def test_get_result_unauthorized(self, client: AsyncClient):
        """GET /retouch/results/:id without auth returns 401."""
        response = await client.get(f"/api/v1/retouch/results/{uuid.uuid4()}")
        assert response.status_code == 401

    @pytest.mark.asyncio
    async def test_price_compare_unauthorized(self, client: AsyncClient):
        """POST /retouch/price-compare without auth returns 401."""
        response = await client.post(
            "/api/v1/retouch/price-compare",
            json={"vehicle_id": str(uuid.uuid4())},
        )
        assert response.status_code == 401