import node_helpers
import comfy.utils
import math
from typing_extensions import override
from comfy_api.latest import ComfyExtension, io
import comfy.model_management
import torch
import nodes

class TextEncodeQwenImageEdit(io.ComfyNode):
    @classmethod
    def define_schema(cls):
        return io.Schema(
            node_id="TextEncodeQwenImageEdit",
            category="advanced/conditioning",
            inputs=[
                io.Clip.Input("clip"),
                io.String.Input("prompt", multiline=True, dynamic_prompts=True),
                io.Vae.Input("vae", optional=True),
                io.Image.Input("image", optional=True),
            ],
            outputs=[
                io.Conditioning.Output(),
            ],
        )

    @classmethod
    def execute(cls, clip, prompt, vae=None, image=None) -> io.NodeOutput:
        ref_latent = None
        if image is None:
            images = []
        else:
            samples = image.movedim(-1, 1)
            total = int(1024 * 1024)

            scale_by = math.sqrt(total / (samples.shape[3] * samples.shape[2]))
            width = round(samples.shape[3] * scale_by)
            height = round(samples.shape[2] * scale_by)

            s = comfy.utils.common_upscale(samples, width, height, "area", "disabled")
            image = s.movedim(1, -1)
            images = [image[:, :, :, :3]]
            if vae is not None:
                ref_latent = vae.encode(image[:, :, :, :3])

        tokens = clip.tokenize(prompt, images=images)
        conditioning = clip.encode_from_tokens_scheduled(tokens)
        if ref_latent is not None:
            conditioning = node_helpers.conditioning_set_values(conditioning, {"reference_latents": [ref_latent]}, append=True)
        return io.NodeOutput(conditioning)


class TextEncodeQwenImageEditPlus(io.ComfyNode):
    @classmethod
    def define_schema(cls):
        return io.Schema(
            node_id="TextEncodeQwenImageEditPlus",
            category="advanced/conditioning",
            inputs=[
                io.Clip.Input("clip"),
                io.String.Input("prompt", multiline=True, dynamic_prompts=True),
                io.Vae.Input("vae", optional=True),
                io.Image.Input("image1", optional=True),
                io.Image.Input("image2", optional=True),
                io.Image.Input("image3", optional=True),
            ],
            outputs=[
                io.Conditioning.Output(),
            ],
        )

    @classmethod
    def execute(cls, clip, prompt, vae=None, image1=None, image2=None, image3=None) -> io.NodeOutput:
        ref_latents = []
        images = [image1, image2, image3]
        images_vl = []
        llama_template = "<|im_start|>system\nDescribe the key features of the input image (color, shape, size, texture, objects, background), then explain how the user's text instruction should alter or modify the image. Generate a new image that meets the user's requirements while maintaining consistency with the original input where appropriate.<|im_end|>\n<|im_start|>user\n{}<|im_end|>\n<|im_start|>assistant\n"
        image_prompt = ""

        for i, image in enumerate(images):
            if image is not None:
                samples = image.movedim(-1, 1)
                total = int(384 * 384)

                scale_by = math.sqrt(total / (samples.shape[3] * samples.shape[2]))
                width = round(samples.shape[3] * scale_by)
                height = round(samples.shape[2] * scale_by)

                s = comfy.utils.common_upscale(samples, width, height, "area", "disabled")
                images_vl.append(s.movedim(1, -1))
                if vae is not None:
                    total = int(1024 * 1024)
                    scale_by = math.sqrt(total / (samples.shape[3] * samples.shape[2]))
                    width = round(samples.shape[3] * scale_by / 8.0) * 8
                    height = round(samples.shape[2] * scale_by / 8.0) * 8

                    s = comfy.utils.common_upscale(samples, width, height, "area", "disabled")
                    ref_latents.append(vae.encode(s.movedim(1, -1)[:, :, :, :3]))

                image_prompt += "Picture {}: <|vision_start|><|image_pad|><|vision_end|>".format(i + 1)

        tokens = clip.tokenize(image_prompt + prompt, images=images_vl, llama_template=llama_template)
        conditioning = clip.encode_from_tokens_scheduled(tokens)
        if len(ref_latents) > 0:
            conditioning = node_helpers.conditioning_set_values(conditioning, {"reference_latents": ref_latents}, append=True)
        return io.NodeOutput(conditioning)


class EmptyQwenImageLayeredLatentImage(io.ComfyNode):
    @classmethod
    def define_schema(cls):
        return io.Schema(
            node_id="EmptyQwenImageLayeredLatentImage",
            display_name="Empty Qwen Image Layered Latent",
            category="latent/qwen",
            inputs=[
                io.Int.Input("width", default=640, min=16, max=nodes.MAX_RESOLUTION, step=16),
                io.Int.Input("height", default=640, min=16, max=nodes.MAX_RESOLUTION, step=16),
                io.Int.Input("layers", default=3, min=0, max=nodes.MAX_RESOLUTION, step=1, advanced=True),
                io.Int.Input("batch_size", default=1, min=1, max=4096),
            ],
            outputs=[
                io.Latent.Output(),
            ],
        )

    @classmethod
    def execute(cls, width, height, layers, batch_size=1) -> io.NodeOutput:
        latent = torch.zeros([batch_size, 16, layers + 1, height // 8, width // 8], device=comfy.model_management.intermediate_device())
        return io.NodeOutput({"samples": latent})


class QwenExtension(ComfyExtension):
    @override
    async def get_node_list(self) -> list[type[io.ComfyNode]]:
        return [
            TextEncodeQwenImageEdit,
            TextEncodeQwenImageEditPlus,
            EmptyQwenImageLayeredLatentImage,
        ]


async def comfy_entrypoint() -> QwenExtension:
    return QwenExtension()
