#  The MIT License (MIT)
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from argparse import ArgumentParser
from diffusers import EulerDiscreteScheduler
from transformers import CLIPTokenizer
from PIL import Image

import migraphx as mgx
import os
import sys
import torch
import time
from functools import wraps

# measurement helper
def measure(fn):
    @wraps(fn)
    def measure_ms(*args, **kwargs):
        start_time = time.perf_counter_ns()
        result = fn(*args, **kwargs)
        end_time = time.perf_counter_ns()
        print(
            f"Elapsed time for {fn.__name__}: {(end_time - start_time) * 1e-6:.4f} ms\n"
        )
        return result

    return measure_ms


def get_args():
    parser = ArgumentParser()
    # Model compile
    parser.add_argument(
        "--onnx-model-path",
        type=str,
        default="/home/stable-diffusion-2-1-base",
        help="Path to onnx model files.",
    )

    parser.add_argument(
        "--compiled-model-path",
        type=str,
        default=None,
        help=
        "Path to compiled mxr model files. If not set, it will be saved next to the onnx model.",
    )

    parser.add_argument(
        "--fp16",
        choices=["all", "vae", "clip", "unet"],
        nargs="+",
        help="Quantize models with fp16 precision.",
    )

    parser.add_argument(
        "--force-compile",
        action="store_true",
        default=False,
        help="Ignore existing .mxr files and override them",
    )

    # Runtime
    parser.add_argument(
        "-s",
        "--seed",
        type=int,
        default=42,
        help="Random seed",
    )

    parser.add_argument(
        "-t",
        "--steps",
        type=int,
        default=20,
        help="Number of steps",
    )

    parser.add_argument(
        "-p",
        "--prompt",
        type=str,
        required=True,
        help="Prompt",
    )

    parser.add_argument(
        "-n",
        "--negative-prompt",
        type=str,
        default="",
        help="Negative prompt",
    )

    parser.add_argument(
        "--scale",
        type=float,
        default=7.0,
        help="Guidance scale",
    )

    parser.add_argument(
        "-o",
        "--output",
        type=str,
        default=None,
        help="Output name",
    )
    return parser.parse_args()


mgx_to_torch_dtype_dict = {
    "bool_type": torch.bool,
    "uint8_type": torch.uint8,
    "int8_type": torch.int8,
    "int16_type": torch.int16,
    "int32_type": torch.int32,
    "int64_type": torch.int64,
    "float_type": torch.float32,
    "double_type": torch.float64,
    "half_type": torch.float16,
}

torch_to_mgx_dtype_dict = {
    value: key
    for (key, value) in mgx_to_torch_dtype_dict.items()
}


def tensor_to_arg(tensor):
    return mgx.argument_from_pointer(
        mgx.shape(
            **{
                "type": torch_to_mgx_dtype_dict[tensor.dtype],
                "lens": list(tensor.size()),
                "strides": list(tensor.stride())
            }), tensor.data_ptr())


def tensors_to_args(tensors):
    return {name: tensor_to_arg(tensor) for name, tensor in tensors.items()}


def get_output_name(idx):
    return f"main:#output_{idx}"


def copy_tensor_sync(tensor, data):
    tensor.copy_(data)
    torch.cuda.synchronize()


def run_model_sync(model, args):
    model.run(args)
    mgx.gpu_sync()


def allocate_torch_tensors(model):
    input_shapes = model.get_parameter_shapes()
    data_mapping = {
        name: torch.zeros(shape.lens()).to(
            mgx_to_torch_dtype_dict[shape.type_string()]).to(device="cuda")
        for name, shape in input_shapes.items()
    }
    return data_mapping


class StableDiffusionMGX():
    def __init__(self, onnx_model_path, compiled_model_path, fp16,
                 force_compile):
        model_id = onnx_model_path
        print(f"Using {model_id}")

        print("Creating EulerDiscreteScheduler scheduler")
        self.scheduler = EulerDiscreteScheduler.from_pretrained(
            model_id, subfolder="scheduler")

        print("Creating CLIPTokenizer tokenizer...")
        self.tokenizer = CLIPTokenizer.from_pretrained(model_id,
                                                       subfolder="tokenizer")
        if fp16 is None:
            fp16 = []
        elif "all" in fp16:
            fp16 = ["vae", "clip", "unet"]

        print("Load models...")
        self.models = {
            "vae":
            StableDiffusionMGX.load_mgx_model(
                "vae_decoder", {"latent_sample": [1, 4, 64, 64]},
                onnx_model_path,
                compiled_model_path=compiled_model_path,
                use_fp16="vae" in fp16,
                force_compile=force_compile,
                offload_copy=False),
            "clip":
            StableDiffusionMGX.load_mgx_model(
                "text_encoder", {"input_ids": [2, 77]},
                onnx_model_path,
                compiled_model_path=compiled_model_path,
                use_fp16="clip" in fp16,
                force_compile=force_compile,
                offload_copy=False),
            "unet":
            StableDiffusionMGX.load_mgx_model(
                "unet", {
                    "sample": [2, 4, 64, 64],
                    "encoder_hidden_states": [2, 77, 1024],
                    "timestep": [1],
                },
                onnx_model_path,
                compiled_model_path=compiled_model_path,
                use_fp16="unet" in fp16,
                force_compile=force_compile,
                offload_copy=False)
        }

        self.tensors = {
            "clip": allocate_torch_tensors(self.models["clip"]),
            "unet": allocate_torch_tensors(self.models["unet"]),
            "vae": allocate_torch_tensors(self.models["vae"]),
        }

        self.model_args = {
            "clip": tensors_to_args(self.tensors['clip']),
            "unet": tensors_to_args(self.tensors['unet']),
            "vae": tensors_to_args(self.tensors['vae']),
        }

    @measure
    @torch.no_grad()
    def run(self, prompt, negative_prompt, steps, seed, scale):
        torch.cuda.synchronize()
        # need to set this for each run
        self.scheduler.set_timesteps(steps, device="cuda")

        print("Tokenizing prompts...")
        prompt_tokens = self.tokenize(prompt, negative_prompt)

        print("Creating text embeddings...")
        text_embeddings = self.get_embeddings(prompt_tokens)

        print(
            f"Creating random input data ({1}x{4}x{64}x{64}) (latents) with seed={seed}..."
        )
        latents = torch.randn(
            (1, 4, 64, 64),
            generator=torch.manual_seed(seed)).to(device="cuda")

        print("Apply initial noise sigma\n")
        latents = latents * self.scheduler.init_noise_sigma

        print("Running denoising loop...")
        for step, t in enumerate(self.scheduler.timesteps):
            print(f"#{step}/{len(self.scheduler.timesteps)} step")
            latents = self.denoise_step(text_embeddings, latents, t, scale)

        print("Scale denoised result...")
        latents = 1 / 0.18215 * latents

        print("Decode denoised result...")
        image = self.decode(latents)

        torch.cuda.synchronize()
        return image

    @staticmethod
    @measure
    def load_mgx_model(name,
                       shapes,
                       onnx_model_path,
                       compiled_model_path=None,
                       use_fp16=False,
                       force_compile=False,
                       offload_copy=True):
        print(f"Loading {name} model...")
        if compiled_model_path is None:
            compiled_model_path = onnx_model_path
        onnx_file = f"{onnx_model_path}/{name}/model.onnx"
        mxr_file = f"{compiled_model_path}/{name}/model_{'fp16' if use_fp16 else 'fp32'}_{'gpu' if not offload_copy else 'oc'}.mxr"
        if not force_compile and os.path.isfile(mxr_file):
            print(f"Found mxr, loading it from {mxr_file}")
            model = mgx.load(mxr_file, format="msgpack")
        elif os.path.isfile(onnx_file):
            print(f"No mxr found at {mxr_file}")
            print(f"Parsing from {onnx_file}")
            model = mgx.parse_onnx(onnx_file, map_input_dims=shapes)
            if use_fp16:
                mgx.quantize_fp16(model)
            model.compile(mgx.get_target("gpu"),
                          offload_copy=offload_copy)
            print(f"Saving {name} model to {mxr_file}")
            os.makedirs(os.path.dirname(mxr_file), exist_ok=True)
            mgx.save(model, mxr_file, format="msgpack")
        else:
            print(
                f"No {name} model found at {onnx_file} or {mxr_file}. Please download it and re-try."
            )
            sys.exit(1)
        return model

    @measure
    def tokenize(self, prompt, negative_prompt):
        return self.tokenizer([prompt, negative_prompt],
                              padding="max_length",
                              max_length=self.tokenizer.model_max_length,
                              truncation=True,
                              return_tensors="pt")

    @measure
    def get_embeddings(self, prompt_tokens):
        copy_tensor_sync(self.tensors["clip"]["input_ids"],
                         prompt_tokens.input_ids.to(torch.int32))
        run_model_sync(self.models["clip"], self.model_args["clip"])
        return self.tensors["clip"][get_output_name(0)]

    @staticmethod
    def convert_to_rgb_image(image):
        image = (image / 2 + 0.5).clamp(0, 1)
        image = image.detach().cpu().permute(0, 2, 3, 1).numpy()
        images = (image * 255).round().astype("uint8")
        return Image.fromarray(images[0])

    @staticmethod
    def save_image(pil_image, filename="output.png"):
        pil_image.save(filename)

    @measure
    def denoise_step(self, text_embeddings, latents, t, scale):
        latents_model_input = torch.cat([latents] * 2)
        latents_model_input = self.scheduler.scale_model_input(
            latents_model_input, t).to(torch.float32).to(device="cuda")
        timestep = torch.atleast_1d(t.to(torch.int64)).to(
            device="cuda")  # convert 0D -> 1D

        copy_tensor_sync(self.tensors["unet"]["sample"], latents_model_input)
        copy_tensor_sync(self.tensors["unet"]["encoder_hidden_states"],
                         text_embeddings)
        copy_tensor_sync(self.tensors["unet"]["timestep"], timestep)
        run_model_sync(self.models["unet"], self.model_args['unet'])

        noise_pred_text, noise_pred_uncond = torch.tensor_split(
            self.tensors["unet"][get_output_name(0)], 2)

        # perform guidance
        noise_pred = noise_pred_uncond + scale * (noise_pred_text -
                                                  noise_pred_uncond)

        # compute the previous noisy sample x_t -> x_t-1
        return self.scheduler.step(noise_pred, t, latents).prev_sample

    @measure
    def decode(self, latents):
        copy_tensor_sync(self.tensors["vae"]["latent_sample"], latents)
        run_model_sync(self.models["vae"], self.model_args["vae"])
        return self.tensors["vae"][get_output_name(0)]

    @measure
    def warmup(self, num_runs):

        copy_tensor_sync(self.tensors["clip"]["input_ids"],
                         torch.ones((2, 77)).to(torch.int32))
        copy_tensor_sync(self.tensors["unet"]["sample"],
                         torch.randn((2, 4, 64, 64)).to(torch.float32))
        copy_tensor_sync(self.tensors["unet"]["encoder_hidden_states"],
                         torch.randn((2, 77, 1024)).to(torch.float32))
        copy_tensor_sync(self.tensors["unet"]["timestep"],
                         torch.atleast_1d(torch.randn(1).to(torch.int64)))
        copy_tensor_sync(self.tensors["vae"]["latent_sample"],
                         torch.randn((1, 4, 64, 64)).to(torch.float32))

        for _ in range(num_runs):
            run_model_sync(self.models["clip"], self.model_args["clip"])
            run_model_sync(self.models["unet"], self.model_args["unet"])
            run_model_sync(self.models["vae"], self.model_args["vae"])


if __name__ == "__main__":
    args = get_args()

    sd = StableDiffusionMGX(args.onnx_model_path, args.compiled_model_path,
                            args.fp16, args.force_compile)
    sd.warmup(5)
    result = sd.run(args.prompt, args.negative_prompt, args.steps, args.seed,
                    args.scale)

    print("Convert result to rgb image...")
    image = StableDiffusionMGX.convert_to_rgb_image(result)
    filename = args.output if args.output else f"output_s{args.seed}_t{args.steps}.png"
    StableDiffusionMGX.save_image(image, filename)
    print(f"Image saved to {filename}")