import logging

from .base_node import (
    SupersideFalNode,
    ImageProcessingMixin,
    APIClientMixin,
    API_KEY_INPUT_SPEC,
)

logger = logging.getLogger(__name__)


class SupersideBriaReplaceBackgroundNode(
    SupersideFalNode, ImageProcessingMixin, APIClientMixin
):
    """
    Bria Replace Background V2 Node: Replace an image's background using
    Bria's Replace Background V2 model on fal.ai (endpoint id
    "bria/replace-background" - note there is no "fal-ai/" prefix on this
    one; the prefixed form 404s).

    Generates a new background with realistic lighting and perspective
    from a text prompt, trained on licensed data for commercial use.
    """

    @classmethod
    def INPUT_TYPES(cls):
        return {
            "required": {
                "image": ("IMAGE",),
                "prompt": (
                    "STRING",
                    {
                        "multiline": True,
                        "placeholder": "Describe the new background scene",
                    },
                ),
                "api_key": API_KEY_INPUT_SPEC,
            },
            "optional": {
                "negative_prompt": (
                    "STRING",
                    {
                        "multiline": True,
                        "default": "",
                        "placeholder": "Describe what to avoid in the background",
                    },
                ),
                "steps_num": ("INT", {"default": 30, "min": 1, "max": 100}),
                "seed": ("INT", {"default": -1, "min": -1, "max": 2147483647, "tooltip": "-1 = random"}),
                "sync_mode": ("BOOLEAN", {"default": False}),
            },
            "hidden": {
                "unique_id": "UNIQUE_ID",
                "extra_pnginfo": "EXTRA_PNGINFO",
            },
        }

    RETURN_TYPES = ("IMAGE", "STRING")
    RETURN_NAMES = ("image", "info")
    FUNCTION = "generate"
    OUTPUT_NODE = True
    DESCRIPTION = (
        "Replace an image's background using Bria Replace Background V2 on "
        "fal.ai (endpoint bria/replace-background). Generates realistic "
        "lighting and perspective from a text prompt."
    )

    def prepare_arguments(self, client, image, prompt, **kwargs):
        image_url = self.upload_image(client, image)

        arguments = {
            "image_url": image_url,
            "prompt": prompt,
        }

        if kwargs.get("negative_prompt"):
            arguments["negative_prompt"] = kwargs["negative_prompt"]

        if kwargs.get("steps_num") is not None:
            arguments["steps_num"] = kwargs["steps_num"]

        seed = kwargs.get("seed", -1)
        if seed is not None and seed != -1:
            arguments["seed"] = seed

        if kwargs.get("sync_mode") is not None:
            arguments["sync_mode"] = kwargs["sync_mode"]

        return arguments

    def generate(self, image, prompt, api_key, unique_id=None, extra_pnginfo=None, **kwargs):
        try:
            client = self.get_client(api_key)
            arguments = self.prepare_arguments(client, image, prompt, **kwargs)
            result = self.call_api(client, "bria/replace-background", arguments)

            # This endpoint returns a single "image" object, not an "images" list.
            image_data = result.get("image")
            if not isinstance(image_data, dict) or "url" not in image_data:
                raise RuntimeError("No image was generated by the API.")

            images = self.process_images({"images": [image_data]})
            info = image_data.get("url", "")

            if unique_id is not None and extra_pnginfo is not None:
                if (
                    isinstance(extra_pnginfo, list)
                    and isinstance(extra_pnginfo[0], dict)
                    and "workflow" in extra_pnginfo[0]
                ):
                    workflow = extra_pnginfo[0]["workflow"]
                    node = next(
                        (x for x in workflow["nodes"] if str(x["id"]) == str(unique_id)),
                        None,
                    )
                    if node:
                        node["widgets_values"] = [info]

            return {"ui": {"text": [info]}, "result": (images[0], info)}
        except Exception as e:
            logger.error(f"Bria replace background failed: {str(e)}")
            raise RuntimeError(f"Bria replace background failed: {str(e)}") from e