from typing import Sequence

from PIL import Image

from services.progress import ProgressCallback, call_progress
from services.registry import register_service
from services.text.TextGenerationResult import TextGenerationResult
from services.text.TextGenerator import TextGenerator


@register_service
class DummyTextGenerator(TextGenerator):
    """Dummy text generator that simply echoes the prompt."""
    service_id = "dummy_text"

    @classmethod
    def default_model_name(cls) -> str:
        return "echo"

    def close(self) -> None:
        return

    def generate(
            self,
            prompt: str,
            images: Sequence[Image.Image] | None = None,
            *,
            progress: ProgressCallback | None = None,
    ) -> TextGenerationResult:
        call_progress(progress, 0.1, "Starting dummy text generation")

        images = images or []
        image_info = ""
        if images:
            image_info = f" (with {len(images)} image inputs)"

        call_progress(progress, 0.6, "Building dummy text response")

        text = f"[dummy-text]{image_info}: {prompt}"

        call_progress(progress, 0.95, "Preparing dummy text result")

        return TextGenerationResult(
            provider="dummy",
            model=self.model_name,
            text=text,
            raw_response=None,
        )