import gradio as gr
from transformers import AutoProcessor, AutoModelForCausalLM
import spaces
import torch.nn.functional as F
import copy
import torch

import random
import numpy as np
from esm import pretrained, FastaBatchedDataset


def get_model(model_id):
    a, b = pretrained.load_model_and_alphabet(model_id.split('/')[1])
    a.to('cuda').eval()
    return (a, b)

models = {
    'facebook/esm2_t36_3B_UR50D': get_model('facebook/esm2_t36_3B_UR50D'),
    }



DESCRIPTION = "Esm2 embedding"

colormap = ['blue','orange','green','purple','brown','pink','gray','olive','cyan','red',
            'lime','indigo','violet','aqua','magenta','coral','gold','tan','skyblue']


@spaces.GPU
def run_example(protein, model_id='facebook/esm2_t36_3B_UR50D'):
    model_esm, alphabet = models[model_id]
    protein_name = 'protein_name'
    protein_seq = protein
    include = 'per_tok'
    repr_layers = [36]
    truncation_seq_length = 1024
    toks_per_batch = 4096
    print("start")
    dataset = FastaBatchedDataset([protein_name], [protein_seq])
    print("dataset prepared")
    batches = dataset.get_batch_indices(toks_per_batch, extra_toks_per_seq=1)
    print("batches prepared")

    data_loader = torch.utils.data.DataLoader(
        dataset, collate_fn=alphabet.get_batch_converter(truncation_seq_length), batch_sampler=batches
    )
    print(f"Read sequences")
    return_contacts = "contacts" in include

    assert all(-(model_esm.num_layers + 1) <= i <= model_esm.num_layers for i in repr_layers)
    repr_layers = [(i + model_esm.num_layers + 1) % (model_esm.num_layers + 1) for i in repr_layers]

    with torch.no_grad():
        for batch_idx, (labels, strs, toks) in enumerate(data_loader):
            print(
                f"Processing {batch_idx + 1} of {len(batches)} batches ({toks.size(0)} sequences)"
            )
            if torch.cuda.is_available():
                toks = toks.to(device="cuda", non_blocking=True)
            out = model_esm(toks, repr_layers=repr_layers, return_contacts=return_contacts)
            representations = {
                layer: t.to(device="cpu") for layer, t in out["representations"].items()
            }
            if return_contacts:
                contacts = out["contacts"].to(device="cpu")
            for i, label in enumerate(labels):
                result = {"label": label}
                truncate_len = min(truncation_seq_length, len(strs[i]))
                # Call clone on tensors to ensure tensors are not views into a larger representation
                # See https://github.com/pytorch/pytorch/issues/1995
                if "per_tok" in include:
                    result["representations"] = {
                        layer: t[i, 1: truncate_len + 1].clone()
                        for layer, t in representations.items()
                    }
                if "mean" in include:
                    result["mean_representations"] = {
                        layer: t[i, 1: truncate_len + 1].mean(0).clone()
                        for layer, t in representations.items()
                    }
                if "bos" in include:
                    result["bos_representations"] = {
                        layer: t[i, 0].clone() for layer, t in representations.items()
                    }
                if return_contacts:
                    result["contacts"] = contacts[i, : truncate_len, : truncate_len].clone()
            esm_emb = result['representations'][36]
    '''
    inputs = tokenizer([protein], return_tensors="pt", padding=True, truncation=True).to('cuda')
    with torch.no_grad():
        outputs = model_esm(**inputs)
    esm_emb = outputs.last_hidden_state.detach()[0]
    '''
    print("esm embedding generated")
    esm_emb = F.pad(esm_emb.t(), (0, 1024 - len(esm_emb))).t()
    torch.save(esm_emb, 'example.pt')
    return gr.File.update(value="example.pt", visible=True)

css = """
  #output {
    height: 500px; 
    overflow: auto; 
    border: 1px solid #ccc; 
  }
"""

with gr.Blocks(css=css) as demo:
    gr.Markdown(DESCRIPTION)
    with gr.Tab(label="Esm2 embedding generation"):
        with gr.Row():
            with gr.Column():
                input_protein = gr.Textbox(type="text", label="Upload sequence")
                model_selector = gr.Dropdown(choices=list(models.keys()), label="Model", value='microsoft/Florence-2-large')
                submit_btn = gr.Button(value="Submit")
            with gr.Column():
                button = gr.Button("Export")
                pt = gr.File(interactive=False, visible=False)
        # gr.Examples(
        #     examples=[
        #         ["image1.jpg", 'Object Detection'],
        #     ],
        #     inputs=[input_img, task_prompt],
        #     outputs=[output_text, output_img],
        #     fn=process_image,
        #     cache_examples=True,
        #     label='Try examples'
        # )

        button.click(run_example, [input_protein, model_selector], pt)

demo.launch(debug=True)