from typing import Literal, Optional, Union

from pydantic import BaseModel, Field

from invokeai.app.invocations.baseinvocation import (BaseInvocation,
                                                     BaseInvocationOutput,
                                                     InvocationContext)
from invokeai.app.invocations.controlnet_image_processors import ControlField
from invokeai.app.invocations.model import (LoRAModelField, MainModelField,
                                            VAEModelField)


class LoRAMetadataField(BaseModel):
    """LoRA metadata for an image generated in InvokeAI."""
    lora: LoRAModelField = Field(description="The LoRA model")
    weight: float = Field(description="The weight of the LoRA model")


class CoreMetadata(BaseModel):
    """Core generation metadata for an image generated in InvokeAI."""

    generation_mode: str = Field(description="The generation mode that output this image",)
    positive_prompt: str = Field(description="The positive prompt parameter")
    negative_prompt: str = Field(description="The negative prompt parameter")
    width: int = Field(description="The width parameter")
    height: int = Field(description="The height parameter")
    seed: int = Field(description="The seed used for noise generation")
    rand_device: str = Field(description="The device used for random number generation")
    cfg_scale: float = Field(description="The classifier-free guidance scale parameter")
    steps: int = Field(description="The number of steps used for inference")
    scheduler: str = Field(description="The scheduler used for inference")
    clip_skip: int = Field(description="The number of skipped CLIP layers",)
    model: MainModelField = Field(description="The main model used for inference")
    controlnets: list[ControlField]= Field(description="The ControlNets used for inference")
    loras: list[LoRAMetadataField] = Field(description="The LoRAs used for inference")
    strength: Union[float, None] = Field(
        default=None,
        description="The strength used for latents-to-latents",
    )
    init_image: Union[str, None] = Field(
        default=None, description="The name of the initial image"
    )
    vae: Union[VAEModelField, None] = Field(
        default=None,
        description="The VAE used for decoding, if the main model's default was not used",
    )


class ImageMetadata(BaseModel):
    """An image's generation metadata"""

    metadata: Optional[dict] = Field(
        default=None,
        description="The image's core metadata, if it was created in the Linear or Canvas UI",
    )
    graph: Optional[dict] = Field(
        default=None, description="The graph that created the image"
    )


class MetadataAccumulatorOutput(BaseInvocationOutput):
    """The output of the MetadataAccumulator node"""

    type: Literal["metadata_accumulator_output"] = "metadata_accumulator_output"

    metadata: CoreMetadata = Field(description="The core metadata for the image")


class MetadataAccumulatorInvocation(BaseInvocation):
    """Outputs a Core Metadata Object"""

    type: Literal["metadata_accumulator"] = "metadata_accumulator"

    generation_mode: str = Field(description="The generation mode that output this image",)
    positive_prompt: str = Field(description="The positive prompt parameter")
    negative_prompt: str = Field(description="The negative prompt parameter")
    width: int = Field(description="The width parameter")
    height: int = Field(description="The height parameter")
    seed: int = Field(description="The seed used for noise generation")
    rand_device: str = Field(description="The device used for random number generation")
    cfg_scale: float = Field(description="The classifier-free guidance scale parameter")
    steps: int = Field(description="The number of steps used for inference")
    scheduler: str = Field(description="The scheduler used for inference")
    clip_skip: int = Field(description="The number of skipped CLIP layers",)
    model: MainModelField = Field(description="The main model used for inference")
    controlnets: list[ControlField]= Field(description="The ControlNets used for inference")
    loras: list[LoRAMetadataField] = Field(description="The LoRAs used for inference")
    strength: Union[float, None] = Field(
        default=None,
        description="The strength used for latents-to-latents",
    )
    init_image: Union[str, None] = Field(
        default=None, description="The name of the initial image"
    )
    vae: Union[VAEModelField, None] = Field(
        default=None,
        description="The VAE used for decoding, if the main model's default was not used",
    )


    def invoke(self, context: InvocationContext) -> MetadataAccumulatorOutput:
        """Collects and outputs a CoreMetadata object"""

        return MetadataAccumulatorOutput(
            metadata=CoreMetadata(
                generation_mode=self.generation_mode,
                positive_prompt=self.positive_prompt,
                negative_prompt=self.negative_prompt,
                width=self.width,
                height=self.height,
                seed=self.seed,
                rand_device=self.rand_device,
                cfg_scale=self.cfg_scale,
                steps=self.steps,
                scheduler=self.scheduler,
                model=self.model,
                strength=self.strength,
                init_image=self.init_image,
                vae=self.vae,
                controlnets=self.controlnets,
                loras=self.loras,
                clip_skip=self.clip_skip,
            )
        )