import os
import random
from typing import Mapping

import gradio as gr
import numpy
import torch
from huggingface_hub import hf_hub_download
from PIL import Image

from cldm.model import create_model, load_state_dict
from cldm.ddim_hacked import DDIMSampler
from mediapipe_face_common import generate_annotation

# Download the SD 1.5 model from HF
device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
model_path = hf_hub_download(repo_id="CrucibleAI/ControlNetMediaPipeFace", filename="models/controlnet_sd21_laion_face_v2_full.ckpt", repo_type="model", revision="568dc2c9980572262d48cff1ef2a7e4a03fadeb6")
config_path = hf_hub_download(repo_id="CrucibleAI/ControlNetMediaPipeFace", filename="models/cldm_v21.yaml", repo_type="model", revision="568dc2c9980572262d48cff1ef2a7e4a03fadeb6")
model = create_model(config_path).cpu()
model.load_state_dict(load_state_dict(model_path, location=device))
model = model.to(device)
ddim_sampler = DDIMSampler(model)  # ControlNet _only_ works with DDIM.


def process(input_image: Image.Image, prompt, a_prompt, n_prompt, max_faces: int, min_confidence: float, num_samples, ddim_steps, guess_mode, strength, scale, seed: int, eta):
    with torch.no_grad():
        empty = generate_annotation(input_image, max_faces, min_confidence)
        visualization = Image.fromarray(empty)  # Save to help debug.

        empty = numpy.moveaxis(empty, 2, 0)  # h, w, c -> c, h, w
        control = torch.from_numpy(empty.copy()).float().to(device) / 255.0
        control = torch.stack([control for _ in range(num_samples)], dim=0)
        # control = einops.rearrange(control, 'b h w c -> b c h w').clone()

        # Sanity check the dimensions.
        B, C, H, W = control.shape
        assert C == 3
        assert B == num_samples

        if seed != -1:
            random.seed(seed)
            os.environ['PYTHONHASHSEED'] = str(seed)
            numpy.random.seed(seed)
            torch.manual_seed(seed)
            torch.cuda.manual_seed(seed)
            torch.backends.cudnn.deterministic = True

        # model.low_vram_shift(is_diffusing=False)

        cond = {"c_concat": [control], "c_crossattn": [model.get_learned_conditioning([prompt + ', ' + a_prompt] * num_samples)]}
        un_cond = {"c_concat": None if guess_mode else [control], "c_crossattn": [model.get_learned_conditioning([n_prompt] * num_samples)]}
        shape = (4, H // 8, W // 8)

        # model.low_vram_shift(is_diffusing=True)

        model.control_scales = [strength * (0.825 ** float(12 - i)) for i in range(13)] if guess_mode else ([strength] * 13)  # Magic number. IDK why. Perhaps because 0.825**12<0.01 but 0.826**12>0.01
        samples, intermediates = ddim_sampler.sample(
            ddim_steps,
            num_samples,
            shape,
            cond,
            verbose=False,
            eta=eta,
            unconditional_guidance_scale=scale,
            unconditional_conditioning=un_cond
        )

        # model.low_vram_shift(is_diffusing=False)

        x_samples = model.decode_first_stage(samples)
        # x_samples = (einops.rearrange(x_samples, 'b c h w -> b h w c') * 127.5 + 127.5).cpu().numpy().clip(0, 255).astype(numpy.uint8)
        x_samples = numpy.moveaxis((x_samples * 127.5 + 127.5).cpu().numpy().clip(0, 255).astype(numpy.uint8), 1, -1)  # b, c, h, w -> b, h, w, c
        results = [visualization] + [x_samples[i] for i in range(num_samples)]

    return results


block = gr.Blocks().queue()
with block:
    with gr.Row():
        gr.Markdown("## Control Stable Diffusion with a Facial Pose")
    with gr.Row():
        with gr.Column():
            input_image = gr.Image(source='upload', type="numpy")
            prompt = gr.Textbox(label="Prompt")
            run_button = gr.Button(label="Run")
            with gr.Accordion("Advanced options", open=False):
                num_samples = gr.Slider(label="Images", minimum=1, maximum=12, value=1, step=1)
                max_faces = gr.Slider(label="Max Faces", minimum=1, maximum=10, value=5, step=1)
                min_confidence = gr.Slider(label="Min Confidence", minimum=0.01, maximum=1.0, value=0.5, step=0.01)
                strength = gr.Slider(label="Control Strength", minimum=0.0, maximum=2.0, value=1.0, step=0.01)
                guess_mode = gr.Checkbox(label='Guess Mode', value=False)
                ddim_steps = gr.Slider(label="Steps", minimum=1, maximum=100, value=20, step=1)
                scale = gr.Slider(label="Guidance Scale", minimum=0.1, maximum=30.0, value=9.0, step=0.1)
                seed = gr.Slider(label="Seed", minimum=-1, maximum=2147483647, step=1, randomize=True)
                eta = gr.Number(label="eta (DDIM)", value=0.0)
                a_prompt = gr.Textbox(label="Added Prompt", value='best quality, extremely detailed')
                n_prompt = gr.Textbox(label="Negative Prompt",
                                      value='longbody, lowres, bad anatomy, bad hands, missing fingers, extra digit, fewer digits, cropped, worst quality, low quality')
        with gr.Column():
            result_gallery = gr.Gallery(label='Output', show_label=False, elem_id="gallery").style(grid=2, height='auto')
    ips = [input_image, prompt, a_prompt, n_prompt, max_faces, min_confidence, num_samples, ddim_steps, guess_mode, strength, scale, seed, eta]
    run_button.click(fn=process, inputs=ips, outputs=[result_gallery])


block.launch(server_name='0.0.0.0')