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import argparse
from pathlib import Path
import os
import torch
from diffusers import StableDiffusionXLPipeline, AutoencoderKL
# also requires aria, gdown, peft, huggingface_hub, safetensors, transformers, accelerate, pytorch_lightning


def list_sub(a, b):
    return [e for e in a if e not in b]


def is_repo_name(s):
    import re
    return re.fullmatch(r'^[^/\.,\s]+?/[^/\.,\s]+?$', s)


def download_thing(directory, url, civitai_api_key=""):
    url = url.strip()
    if "drive.google.com" in url:
        original_dir = os.getcwd()
        os.chdir(directory)
        os.system(f"gdown --fuzzy {url}")
        os.chdir(original_dir)
    elif "huggingface.co" in url:
        url = url.replace("?download=true", "")
        if "/blob/" in url:
            url = url.replace("/blob/", "/resolve/")
            os.system(f"aria2c --console-log-level=error --summary-interval=10 -c -x 16 -k 1M -s 16 {url} -d {directory}  -o {url.split('/')[-1]}")
        else:
            os.system (f"aria2c --optimize-concurrent-downloads --console-log-level=error --summary-interval=10 -c -x 16 -k 1M -s 16 {url} -d {directory}  -o {url.split('/')[-1]}")
    elif "civitai.com" in url:
        if "?" in url:
            url = url.split("?")[0]
        if civitai_api_key:
            url = url + f"?token={civitai_api_key}"
            os.system(f"aria2c --console-log-level=error --summary-interval=10 -c -x 16 -k 1M -s 16 -d {directory} {url}")
        else:
            print("You need an API key to download Civitai models.")
    else:
        os.system(f"aria2c --console-log-level=error --summary-interval=10 -c -x 16 -k 1M -s 16 -d {directory} {url}")


def get_local_model_list(dir_path):
    model_list = []
    valid_extensions = ('.safetensors')
    for file in Path(dir_path).glob("*"):
        if file.suffix in valid_extensions:
            file_path = str(Path(f"{dir_path}/{file.name}"))
            model_list.append(file_path)
    return model_list


def get_download_file(temp_dir, url, civitai_key):
    if not "http" in url and is_repo_name(url) and not Path(url).exists():
        print(f"Use HF Repo: {url}")
        new_file = url
    elif not "http" in url and Path(url).exists():
        print(f"Use local file: {url}")
        new_file = url
    elif Path(f"{temp_dir}/{url.split('/')[-1]}").exists():
        print(f"File to download alreday exists: {url}")
        new_file = f"{temp_dir}/{url.split('/')[-1]}"
    else:
        print(f"Start downloading: {url}")
        before = get_local_model_list(temp_dir)
        try:
            download_thing(temp_dir, url.strip(), civitai_key)
        except Exception:
            print(f"Download failed: {url}")
            return ""
        after = get_local_model_list(temp_dir)
        new_file = list_sub(after, before)[0] if list_sub(after, before) else ""
    if not new_file:
        print(f"Download failed: {url}")
        return ""
    print(f"Download completed: {url}")
    return new_file


from diffusers import (
    DPMSolverMultistepScheduler,
    DPMSolverSinglestepScheduler,
    KDPM2DiscreteScheduler,
    EulerDiscreteScheduler,
    EulerAncestralDiscreteScheduler,
    HeunDiscreteScheduler,
    LMSDiscreteScheduler,
    DDIMScheduler,
    DEISMultistepScheduler,
    UniPCMultistepScheduler,
    LCMScheduler,
    PNDMScheduler,
    KDPM2AncestralDiscreteScheduler,
    DPMSolverSDEScheduler,
    EDMDPMSolverMultistepScheduler,
    DDPMScheduler,
    EDMEulerScheduler,
    TCDScheduler,
)


SCHEDULER_CONFIG_MAP = {
    "DPM++ 2M": (DPMSolverMultistepScheduler, {"use_karras_sigmas": False}),
    "DPM++ 2M Karras": (DPMSolverMultistepScheduler, {"use_karras_sigmas": True}),
    "DPM++ 2M SDE": (DPMSolverMultistepScheduler, {"use_karras_sigmas": False, "algorithm_type": "sde-dpmsolver++"}),
    "DPM++ 2M SDE Karras": (DPMSolverMultistepScheduler, {"use_karras_sigmas": True, "algorithm_type": "sde-dpmsolver++"}),
    "DPM++ 2S": (DPMSolverSinglestepScheduler, {"use_karras_sigmas": False}),
    "DPM++ 2S Karras": (DPMSolverSinglestepScheduler, {"use_karras_sigmas": True}),
    "DPM++ 1S": (DPMSolverMultistepScheduler, {"solver_order": 1}),
    "DPM++ 1S Karras": (DPMSolverMultistepScheduler, {"solver_order": 1, "use_karras_sigmas": True}),
    "DPM++ 3M": (DPMSolverMultistepScheduler, {"solver_order": 3}),
    "DPM++ 3M Karras": (DPMSolverMultistepScheduler, {"solver_order": 3, "use_karras_sigmas": True}),
    "DPM++ SDE": (DPMSolverSDEScheduler, {"use_karras_sigmas": False}),
    "DPM++ SDE Karras": (DPMSolverSDEScheduler, {"use_karras_sigmas": True}),
    "DPM2": (KDPM2DiscreteScheduler, {}),
    "DPM2 Karras": (KDPM2DiscreteScheduler, {"use_karras_sigmas": True}),
    "DPM2 a": (KDPM2AncestralDiscreteScheduler, {}),
    "DPM2 a Karras": (KDPM2AncestralDiscreteScheduler, {"use_karras_sigmas": True}),
    "Euler": (EulerDiscreteScheduler, {}),
    "Euler a": (EulerAncestralDiscreteScheduler, {}),
    "Euler trailing": (EulerDiscreteScheduler, {"timestep_spacing": "trailing", "prediction_type": "sample"}),
    "Euler a trailing": (EulerAncestralDiscreteScheduler, {"timestep_spacing": "trailing"}),
    "Heun": (HeunDiscreteScheduler, {}),
    "Heun Karras": (HeunDiscreteScheduler, {"use_karras_sigmas": True}),
    "LMS": (LMSDiscreteScheduler, {}),
    "LMS Karras": (LMSDiscreteScheduler, {"use_karras_sigmas": True}),
    "DDIM": (DDIMScheduler, {}),
    "DDIM trailing": (DDIMScheduler, {"timestep_spacing": "trailing"}),
    "DEIS": (DEISMultistepScheduler, {}),
    "UniPC": (UniPCMultistepScheduler, {}),
    "UniPC Karras": (UniPCMultistepScheduler, {"use_karras_sigmas": True}),
    "PNDM": (PNDMScheduler, {}),
    "Euler EDM": (EDMEulerScheduler, {}),
    "Euler EDM Karras": (EDMEulerScheduler, {"use_karras_sigmas": True}),
    "DPM++ 2M EDM": (EDMDPMSolverMultistepScheduler, {"solver_order": 2, "solver_type": "midpoint", "final_sigmas_type": "zero", "algorithm_type": "dpmsolver++"}),
    "DPM++ 2M EDM Karras": (EDMDPMSolverMultistepScheduler, {"use_karras_sigmas": True, "solver_order": 2, "solver_type": "midpoint", "final_sigmas_type": "zero", "algorithm_type": "dpmsolver++"}),
    "DDPM": (DDPMScheduler, {}),

    "DPM++ 2M Lu": (DPMSolverMultistepScheduler, {"use_lu_lambdas": True}),
    "DPM++ 2M Ef": (DPMSolverMultistepScheduler, {"euler_at_final": True}),
    "DPM++ 2M SDE Lu": (DPMSolverMultistepScheduler, {"use_lu_lambdas": True, "algorithm_type": "sde-dpmsolver++"}),
    "DPM++ 2M SDE Ef": (DPMSolverMultistepScheduler, {"algorithm_type": "sde-dpmsolver++", "euler_at_final": True}),

    "LCM": (LCMScheduler, {}),
    "TCD": (TCDScheduler, {}),
    "LCM trailing": (LCMScheduler, {"timestep_spacing": "trailing"}),
    "TCD trailing": (TCDScheduler, {"timestep_spacing": "trailing"}),
    "LCM Auto-Loader": (LCMScheduler, {}),
    "TCD Auto-Loader": (TCDScheduler, {}),
}


def get_scheduler_config(name):
    if not name in SCHEDULER_CONFIG_MAP.keys(): return SCHEDULER_CONFIG_MAP["Euler a"]
    return SCHEDULER_CONFIG_MAP[name]


def save_readme_md(dir, url):
    orig_url = ""
    orig_name = ""
    if is_repo_name(url): 
        orig_name = url
        orig_url = f"https://huggingface.co/{url}/"
    elif "http" in url:
        orig_name = url
        orig_url = url
    if orig_name and orig_url:
       md = f"""---

license: other

tags:

- text-to-image

---

Converted from [{orig_name}]({orig_url}).

"""
    else:
        md = f"""---

license: other

tags:

- text-to-image

---

"""
    path = str(Path(dir, "README.md"))
    with open(path, mode='w', encoding="utf-8") as f:
        f.write(md)


def fuse_loras(pipe, civitai_key="", lora_dict={}, temp_dir="."):
    if not lora_dict or not isinstance(lora_dict, dict): return
    a_list = []
    w_list = []
    for k, v in lora_dict.items():
        new_lora_file = get_download_file(temp_dir, k, civitai_key)
        if not new_lora_file or not Path(new_lora_file).exists():
            print(f"LoRA not found: {k}")
            continue
        w_name = Path(new_lora_file).name
        a_name = Path(new_lora_file).stem
        pipe.load_lora_weights(new_lora_file, weight_name = w_name, adapter_name = a_name)
        a_list.append(a_name)
        w_list.append(v) 
    pipe.set_adapters(a_list, adapter_weights=w_list)
    pipe.fuse_lora(adapter_names=a_list, lora_scale=1.0)
    pipe.unload_lora_weights()


def convert_url_to_diffusers_sdxl(url, civitai_key="", half=True, vae=None, scheduler="Euler a", lora_dict={}):
    temp_dir = "."
    new_file = get_download_file(temp_dir, url, civitai_key)
    if not new_file:
        print(f"Not found: {url}")
        return
    new_repo_name = Path(new_file).stem.replace(" ", "_").replace(",", "_").replace(".", "_") #

    pipe = None
    if is_repo_name(new_file):
        if half:
            pipe = StableDiffusionXLPipeline.from_pretrained(new_file, use_safetensors=True, torch_dtype=torch.float16)
        else:
            pipe = StableDiffusionXLPipeline.from_pretrained(new_file, use_safetensors=True)
    else:
        if half:
            pipe = StableDiffusionXLPipeline.from_single_file(new_file, use_safetensors=True, torch_dtype=torch.float16)
        else:
            pipe = StableDiffusionXLPipeline.from_single_file(new_file, use_safetensors=True)

    new_vae_file = ""
    if vae:
        if is_repo_name(vae):
            if half:
                pipe.vae = AutoencoderKL.from_pretrained(vae, torch_dtype=torch.float16)
            else:
                pipe.vae = AutoencoderKL.from_pretrained(vae)
        else:
            new_vae_file = get_download_file(temp_dir, vae, civitai_key)
            if new_vae_file and half:
                pipe.vae = AutoencoderKL.from_single_file(new_vae_file, torch_dtype=torch.float16)
            elif new_vae_file:
                pipe.vae = AutoencoderKL.from_single_file(new_vae_file)

    fuse_loras(pipe, lora_dict, temp_dir, civitai_key)

    sconf = get_scheduler_config(scheduler)
    pipe.scheduler = sconf[0].from_config(pipe.scheduler.config, **sconf[1])

    if half:
        pipe.save_pretrained(new_repo_name, safe_serialization=True, use_safetensors=True)
    else:
        pipe.save_pretrained(new_repo_name, safe_serialization=True, use_safetensors=True)

    if Path(new_repo_name).exists():
        save_readme_md(new_repo_name, url)


if __name__ == "__main__":
    parser = argparse.ArgumentParser()

    parser.add_argument("--url", default=None, type=str, required=True, help="URL of the model to convert.")
    parser.add_argument("--half", default=True, help="Save weights in half precision.")
    parser.add_argument("--scheduler", default="Euler a", type=str, choices=list(SCHEDULER_CONFIG_MAP.keys()), required=False, help="Scheduler name to use.")
    parser.add_argument("--vae", default=None, type=str, required=False, help="URL of the VAE to use.")
    parser.add_argument("--civitai_key", default=None, type=str, required=False, help="Civitai API Key (If you want to download file from Civitai).")
    parser.add_argument("--lora1", default=None, type=str, required=False, help="URL of the LoRA to use.")
    parser.add_argument("--lora1s", default=1.0, type=float, required=False, help="LoRA weight scale of --lora1.")
    parser.add_argument("--lora2", default=None, type=str, required=False, help="URL of the LoRA to use.")
    parser.add_argument("--lora2s", default=1.0, type=float, required=False, help="LoRA weight scale of --lora2.")
    parser.add_argument("--lora3", default=None, type=str, required=False, help="URL of the LoRA to use.")
    parser.add_argument("--lora3s", default=1.0, type=float, required=False, help="LoRA weight scale of --lora3.")
    parser.add_argument("--lora4", default=None, type=str, required=False, help="URL of the LoRA to use.")
    parser.add_argument("--lora4s", default=1.0, type=float, required=False, help="LoRA weight scale of --lora4.")
    parser.add_argument("--lora5", default=None, type=str, required=False, help="URL of the LoRA to use.")
    parser.add_argument("--lora5s", default=1.0, type=float, required=False, help="LoRA weight scale of --lora5.")
    parser.add_argument("--loras", default=None, type=str, required=False, help="Folder of the LoRA to use.")

    args = parser.parse_args()
    assert args.url is not None, "Must provide a URL!"

    lora_dict = {args.lora1: args.lora1s, args.lora2: args.lora2s, args.lora3: args.lora3s, args.lora4: args.lora4s, args.lora5: args.lora5s}
    if None in lora_dict.keys(): del lora_dict[None]

    if args.loras and Path(args.loras).exists():
        for p in Path(args.loras).glob('**/*.safetensors'):
            lora_dict[str(p)] = 1.0

    convert_url_to_diffusers_sdxl(args.url, args.civitai_key, args.half, args.vae, args.scheduler, lora_dict)


# Usage: python convert_url_to_diffusers_sdxl.py --url https://huggingface.co/bluepen5805/anima_pencil-XL/blob/main/anima_pencil-XL-v5.0.0.safetensors
# python convert_url_to_diffusers_sdxl.py --url https://huggingface.co/bluepen5805/anima_pencil-XL/blob/main/anima_pencil-XL-v5.0.0.safetensors --scheduler "Euler a"
# python convert_url_to_diffusers_sdxl.py --url https://huggingface.co/bluepen5805/anima_pencil-XL/blob/main/anima_pencil-XL-v5.0.0.safetensors --loras ./loras