from __future__ import annotations

import io
import os
from typing import Optional

from PIL import Image

from .base import ImageGenerationOptions, ImageGenerationResult, ImageGenerationProvider
from utils.logger_utils import get_service_logger


logger = get_service_logger("image_generation.gemini")


class GeminiImageProvider(ImageGenerationProvider):
    """Google Gemini/Imagen backed image generation.

    NOTE: Implementation should call the actual Gemini Images API used in the codebase.
    Here we keep a minimal interface and expect the underlying client to be wired
    similarly to other providers and return a PIL image or raw bytes.
    """

    def __init__(self) -> None:
        api_key = os.getenv("GOOGLE_API_KEY")
        if not api_key:
            logger.warning("GOOGLE_API_KEY not set. Gemini image generation may fail at runtime.")
        logger.info("GeminiImageProvider initialized")

    def generate(self, options: ImageGenerationOptions) -> ImageGenerationResult:
        # Placeholder implementation to be replaced by real Gemini/Imagen call.
        # For now, generate a 1x1 transparent PNG to maintain interface consistency
        img = Image.new("RGBA", (max(1, options.width), max(1, options.height)), (0, 0, 0, 0))
        with io.BytesIO() as buf:
            img.save(buf, format="PNG")
            png = buf.getvalue()

        return ImageGenerationResult(
            image_bytes=png,
            width=img.width,
            height=img.height,
            provider="gemini",
            model=os.getenv("GEMINI_IMAGE_MODEL"),
            seed=options.seed,
        )