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import gradio as gr
import io
import base64
from flask import Flask, render_template, request, send_file, jsonify
import torch
import json
from PIL import Image
from diffusers import DiffusionPipeline
from diffusers import (
    DDPMScheduler,
    DDIMScheduler,
    PNDMScheduler,
    LMSDiscreteScheduler,
    EulerAncestralDiscreteScheduler,
    EulerDiscreteScheduler,
    DPMSolverMultistepScheduler,
)
import threading
import requests
from flask import Flask, render_template_string
from gradio import Interface
from diffusers import AutoencoderKL
import pandas as pd 
import base64
from config import Config

config = Config()

def device_change(device):
    
    return config.set_config('device', device), config.assemble_code()

def models_change(model, scheduler):
        
    use_safetensors = False
    
    # no model selected (because this is UI init run)
    if type(model) != list and model is not None:
        
        use_safetensors = str(config.model_configs[model]['use_safetensors'])

        # if no scheduler is selected, choose the default one for this model
        if scheduler == None:
            
            scheduler = config.model_configs[model]['scheduler']

    safety_checker_change(config.current["safety_checker"])
    requires_safety_checker_change(config.current["requires_safety_checker"])

    return use_safetensors, scheduler, config.set_config('model', model), config.assemble_code()

def data_type_change(data_type):

    return config.set_config('data_type', data_type), config.assemble_code()

def get_data_type(str_data_type):
    
    if str_data_type == "bfloat16":
        return torch.bfloat16 # BFloat16 is not supported on MPS as of 01/2024
    else:
        return torch.float16 # Half-precision weights, as of https://huggingface.co/docs/diffusers/main/en/optimization/fp16 will save GPU memory

def tensorfloat32_change(allow_tensorfloat32):  
        
    return config.set_config('allow_tensorfloat32', allow_tensorfloat32), config.assemble_code()

def inference_steps_change(inference_steps):
    
    return config.set_config('inference_steps', inference_steps), config.assemble_code()

def manual_seed_change(manual_seed):
            
    return config.set_config('manual_seed', manual_seed), config.assemble_code()

def guidance_scale_change(guidance_scale):
    
    return config.set_config('guidance_scale', guidance_scale), config.assemble_code()

def prompt_change(prompt):
    
    return config.set_config('prompt', prompt), config.assemble_code()

def negative_prompt_change(negative_prompt):
    
    return config.set_config('negative_prompt', negative_prompt), config.assemble_code()

def variant_change(variant):
    
    return config.set_config('variant', variant), config.assemble_code()
    
def safety_checker_change(safety_checker):
        
    return config.set_config('safety_checker', safety_checker), config.assemble_code()

def requires_safety_checker_change(requires_safety_checker):
    
    return config.set_config('requires_safety_checker', requires_safety_checker), config.assemble_code()

def schedulers_change(scheduler):
    
    return config.get_scheduler_description(scheduler), config.set_config('scheduler', scheduler), config.assemble_code()

def get_tensorfloat32(allow_tensorfloat32):
        
    return True if str(allow_tensorfloat32).lower() == 'true' else False

def get_scheduler(scheduler, config):
    
    if scheduler == "DDPMScheduler":
        return DDPMScheduler.from_config(config)
    elif scheduler == "DDIMScheduler":
        return DDIMScheduler.from_config(config)
    elif scheduler == "PNDMScheduler":
        return PNDMScheduler.from_config(config)
    elif scheduler == "LMSDiscreteScheduler":
        return LMSDiscreteScheduler.from_config(config)
    elif scheduler == "EulerAncestralDiscreteScheduler":
        return EulerAncestralDiscreteScheduler.from_config(config)
    elif scheduler == "EulerDiscreteScheduler":
        return EulerDiscreteScheduler.from_config(config)
    elif scheduler == "DPMSolverMultistepScheduler":
        return DPMSolverMultistepScheduler.from_config(config)
    else:
        return DPMSolverMultistepScheduler.from_config(config)

# get 
# - initial configuration, 
# - a list of available devices from the config file
# - a list of available models from the config file
# - a list of available schedulers from the config file
# - a dict that contains code to for reproduction
config.set_inital_config()
# config.current, devices, model_configs, scheduler_configs, code = config.get_inital_config()

# device                  = config.current["device"]
# model                   = config.current["model"]
# scheduler               = config.current["scheduler"]
# variant                 = config.current["variant"]
# allow_tensorfloat32     = config.current["allow_tensorfloat32"]
# use_safetensors         = config.current["use_safetensors"]
# data_type               = config.current["data_type"]
# safety_checker          = config.current["safety_checker"]
# requires_safety_checker = config.current["requires_safety_checker"]
# manual_seed             = config.current["manual_seed"]
# inference_steps         = config.current["inference_steps"]
# guidance_scale          = config.current["guidance_scale"]
# prompt                  = config.current["prompt"]
# negative_prompt         = config.current["negative_prompt"]

config_history = []

# pipeline
def run_inference(model,
                    device, 
                    use_safetensors, 
                    data_type, 
                    variant, 
                    safety_checker,
                    requires_safety_checker,
                    scheduler,
                    prompt,
                    negative_prompt,
                    inference_steps,
                    manual_seed,
                    guidance_scale,
                    progress=gr.Progress(track_tqdm=True)):
    
    if config.current["model"] != None and config.current["scheduler"] != None:
        
        progress((1,3), desc="Preparing pipeline initialization...")
        
        torch.backends.cuda.matmul.allow_tf32 = config.current["allow_tensorfloat32"] # Use TensorFloat-32 as of https://huggingface.co/docs/diffusers/main/en/optimization/fp16 faster, but slightly less accurate computations
        
        progress((2,3), desc="Initializing pipeline...")
        
        pipeline = DiffusionPipeline.from_pretrained(
            config.current["model"], 
            use_safetensors=config.current["use_safetensors"], 
            torch_dtype=get_data_type(config.current["data_type"]), 
            variant=variant).to(config.current["device"])
        
        if config.current["safety_checker"] is None or str(config.current["safety_checker"]).lower == 'false':
            pipeline.safety_checker = None 

        pipeline.requires_safety_checker = config.current["requires_safety_checker"]
                
        pipeline.scheduler = get_scheduler(scheduler, pipeline.scheduler.config)
        
        manual_seed = int(manual_seed)
        if manual_seed < 0 or manual_seed is None or manual_seed == '':
            generator = torch.Generator(device)
        else:
            generator = torch.manual_seed(42) 
        
        progress((3,3), desc="Creating the result...")

        image = pipeline(
            prompt=prompt,
            negative_prompt=negative_prompt,
            generator=generator,
            num_inference_steps=int(inference_steps), 
            guidance_scale=float(guidance_scale)).images[0]
        
        config_history.append(config.current.copy())

        return image, dict_list_to_markdown_table(config_history)
    
    else:
    
        return "Please select a model AND a scheduler.", None

def dict_list_to_markdown_table(config_history):

    if not config_history:
        return ""

    headers = list(config_history[0].keys())
    markdown_table = "| share | " + " | ".join(headers) + " |\n"
    markdown_table += "| ---  | " + " | ".join(["---"] * len(headers)) + " |\n"

    for index, config in enumerate(config_history):
            
        encoded_config = base64.b64encode(str(config).encode()).decode()
        share_link = f'<a target="_blank" href="?config={encoded_config}">📎</a>'
        markdown_table += f"| {share_link} | " + " | ".join(str(config.get(key, "")) for key in headers) + " |\n"

    markdown_table = '<div style="overflow-x: auto;">\n\n' + markdown_table + '</div>'

    return markdown_table

# interface
with gr.Blocks() as demo:
        
    gr.Markdown('''## Text-2-Image Playground
                <small>by <a target="_blank" href="https://www.linkedin.com/in/nickyreinert/">Nicky Reinert</a> | 
                home base: https://huggingface.co/spaces/n42/pictero
                </small>''')
    gr.Markdown("### Device specific settings")
    with gr.Row():
        in_devices = gr.Dropdown(label="Device:", value=config.current["device"], choices=config.devices, filterable=True, multiselect=False, allow_custom_value=True)
        in_data_type = gr.Radio(label="Data Type:", value=config.current["data_type"], choices=["bfloat16", "float16"], info="`bfloat16` is not supported on MPS devices right now; Half-precision weights, will save GPU memory, see https://huggingface.co/docs/diffusers/main/en/optimization/fp16")
        in_allow_tensorfloat32 = gr.Radio(label="Allow TensorFloat32:", value=config.current["allow_tensorfloat32"], choices=[True, False], info="is not supported on MPS devices right now; use TensorFloat-32 is faster, but results in slightly less accurate computations, see https://huggingface.co/docs/diffusers/main/en/optimization/fp16 ")
        in_variant = gr.Radio(label="Variant:", value=config.current["variant"], choices=["fp16", None], info="Use half-precision weights will save GPU memory, not all models support that, see https://huggingface.co/docs/diffusers/main/en/optimization/fp16 ")
        
    gr.Markdown("### Model specific settings")
    with gr.Row():
        models = list(config.model_configs.keys())
        in_models = gr.Dropdown(choices=models, label="Model")
    with gr.Row():
        with gr.Column(scale=1):
            in_use_safetensors = gr.Radio(label="Use safe tensors:", choices=["True", "False"], interactive=False)
        with gr.Column(scale=1):
            in_safety_checker = gr.Radio(label="Enable safety checker:", value=config.current["safety_checker"], choices=[True, False])
            in_requires_safety_checker = gr.Radio(label="Requires safety checker:", value=config.current["requires_safety_checker"], choices=[True, False])

    gr.Markdown("### Scheduler")
    with gr.Row():
        schedulers = list(config.scheduler_configs.keys())
        in_schedulers = gr.Dropdown(choices=schedulers, label="Scheduler", info="see https://huggingface.co/docs/diffusers/using-diffusers/loading#schedulers" )
        out_scheduler_description = gr.Textbox(value="", label="Description")
    
    gr.Markdown("### Adapters")
    with gr.Row():
        gr.Markdown('Choose an adapter.')
        
    gr.Markdown("### Inference settings")
    with gr.Row():
        in_prompt = gr.TextArea(label="Prompt", value=config.current["prompt"])
        in_negative_prompt = gr.TextArea(label="Negative prompt", value=config.current["negative_prompt"])
    with gr.Row():
        in_inference_steps = gr.Number(label="Inference steps", value=config.current["inference_steps"])
        in_manual_seed = gr.Number(label="Manual seed", value=config.current["manual_seed"], info="Set this to -1 or leave it empty to randomly generate an image. A fixed value will result in a similar image for every run")
        in_guidance_scale = gr.Slider(minimum=0, maximum=1, step=0.01, label="Guidance Scale", value=config.current["guidance_scale"], info="A low guidance scale leads to a faster inference time, with the drawback that negative prompts don’t have any effect on the denoising process.")
        
    gr.Markdown("### Output")
    with gr.Row():
        btn_start_pipeline = gr.Button(value="Run inferencing")
    with gr.Row():
        # out_result = gr.Textbox(label="Status", value="")
        out_image = gr.Image()
        out_code = gr.Code(config.assemble_code(), label="Code")
    with gr.Row():
        out_current_config = gr.Code(value=str(config.current), label="Current config")
    with gr.Row():
        out_config_history = gr.Markdown(dict_list_to_markdown_table(config_history))
    
    in_devices.change(device_change, inputs=[in_devices], outputs=[out_current_config, out_code])
    in_data_type.change(data_type_change, inputs=[in_data_type], outputs=[out_current_config, out_code])
    in_allow_tensorfloat32.change(tensorfloat32_change, inputs=[in_allow_tensorfloat32], outputs=[out_current_config, out_code])
    in_variant.change(variant_change, inputs=[in_variant], outputs=[out_current_config, out_code])
    in_models.change(models_change, inputs=[in_models, in_schedulers], outputs=[in_use_safetensors, in_schedulers, out_current_config, out_code])
    in_safety_checker.change(safety_checker_change, inputs=[in_safety_checker], outputs=[out_current_config, out_code])
    in_requires_safety_checker.change(requires_safety_checker_change, inputs=[in_requires_safety_checker], outputs=[out_current_config, out_code])
    in_schedulers.change(schedulers_change, inputs=[in_schedulers], outputs=[out_scheduler_description, out_current_config, out_code])
    in_inference_steps.change(inference_steps_change, inputs=[in_inference_steps], outputs=[out_current_config, out_code])
    in_manual_seed.change(manual_seed_change, inputs=[in_manual_seed], outputs=[out_current_config, out_code])
    in_guidance_scale.change(guidance_scale_change, inputs=[in_guidance_scale], outputs=[out_current_config, out_code])
    in_prompt.change(prompt_change, inputs=[in_prompt], outputs=[out_current_config, out_code])
    in_negative_prompt.change(negative_prompt_change, inputs=[in_negative_prompt], outputs=[out_current_config, out_code])
    btn_start_pipeline.click(run_inference, inputs=[
        in_models, 
        in_devices,
        in_use_safetensors,
        in_data_type,
        in_variant,
        in_safety_checker,
        in_requires_safety_checker,
        in_schedulers,
        in_prompt,
        in_negative_prompt,
        in_inference_steps,
        in_manual_seed,
        in_guidance_scale
        ], outputs=[
            out_image,
            out_config_history])

    demo.load(fn=config.init_config, inputs=out_current_config, 
        outputs=[
            in_models,
            in_devices,
            in_use_safetensors,
            in_data_type,
            in_variant,
            in_safety_checker,
            in_requires_safety_checker,
            in_schedulers,
            in_prompt,
            in_negative_prompt,
            in_inference_steps,
            in_manual_seed,
            in_guidance_scale
            ])

demo.launch()