import torch
from PIL.Image import Image
from diffusers import StableDiffusionXLPipeline
from pipelines.models import TextToImageRequest
from diffusers import DDIMScheduler
from torch import Generator
from loss import SchedulerWrapper
from onediffx import compile_pipe, save_pipe, load_pipe

def callback_dynamic_cfg(pipe, step_index, timestep, callback_kwargs):
  if step_index == int(pipe.num_timesteps * 0.68):
    callback_kwargs['prompt_embeds'] = callback_kwargs['prompt_embeds'].chunk(2)[-1]
    callback_kwargs['add_text_embeds'] = callback_kwargs['add_text_embeds'].chunk(2)[-1]
    callback_kwargs['add_time_ids'] = callback_kwargs['add_time_ids'].chunk(2)[-1]
    pipe._guidance_scale = 0.0
  return callback_kwargs

def load_pipeline(pipeline=None) -> StableDiffusionXLPipeline:
    if not pipeline:
        pipeline = StableDiffusionXLPipeline.from_pretrained(
            "stablediffusionapi/newdream-sdxl-20",
            torch_dtype=torch.float16,)
    pipeline.to("cuda")
    pipeline.scheduler = SchedulerWrapper(DDIMScheduler.from_config(pipeline.scheduler.config))    
    pipeline = compile_pipe(pipeline)
    load_pipe(pipeline, dir="/home/sandbox/.cache/huggingface/hub/models--slobers--make_me_happy/snapshots/e9e3df7becb1604be23ff2454d7e206fa331d0f7")
    for _ in range(1):
        deepcache_output = pipeline(prompt="insensible, timbale, pothery, electrovital, actinogram, taxis, intracerebellar, centrodesmus", output_type="pil", cache_interval=1, cache_layer_id=1, cache_block_id=0)
    pipeline.scheduler.prepare_loss()
    for _ in range(2):
        pipeline(prompt="insensible, timbale, pothery, electrovital, actinogram, taxis, intracerebellar, centrodesmus", output_type="pil", num_inference_steps=20)
    return pipeline

def infer(request: TextToImageRequest, pipeline: StableDiffusionXLPipeline) -> Image:
    if request.seed is None:
        generator = None
    else:
        generator = Generator(pipeline.device).manual_seed(request.seed)

    return pipeline(
        prompt=request.prompt,
        negative_prompt=request.negative_prompt,
        width=request.width,
        height=request.height,
        generator=generator,
        num_inference_steps=13,
        cache_interval=1,
        cache_layer_id=1,
        cache_block_id=0,
        eta=1.0,
        guidance_scale = 5.0,
        guidance_rescale = 0.0,
        callback_on_step_end=callback_dynamic_cfg,
        callback_on_step_end_tensor_inputs=['prompt_embeds', 'add_text_embeds', 'add_time_ids'],
    ).images[0]