import gradio as gr
import os, gc
import torch
from transformers import CLIPImageProcessor
from huggingface_hub import hf_hub_download

ctx_limit = 3500
num_image_embeddings = 4096
title = 'ViusualRWKV-v5'
rwkv_remote_path = "rwkv1b5-vitl336p14-577token_mix665k_rwkv.pth"
vision_remote_path = "rwkv1b5-vitl336p14-577token_mix665k_visual.pth"
vision_tower_name = 'openai/clip-vit-large-patch14-336'

os.environ["RWKV_JIT_ON"] = '1'
os.environ["RWKV_CUDA_ON"] = '0' # if '1' then use CUDA kernel for seq mode (much faster)

from modeling_vision import VisionEncoder, VisionEncoderConfig
from modeling_rwkv import RWKV
model_path = hf_hub_download(repo_id="howard-hou/visualrwkv-5", filename=rwkv_remote_path)
model = RWKV(model=model_path, strategy='cpu fp32')
from rwkv.utils import PIPELINE, PIPELINE_ARGS
pipeline = PIPELINE(model, "rwkv_vocab_v20230424")

##########################################################################
config = VisionEncoderConfig(n_embd=model.args.n_embd, 
                             vision_tower_name=vision_tower_name, 
                             grid_size=-1)
visual_encoder = VisionEncoder(config)
vision_local_path = hf_hub_download(repo_id="howard-hou/visualrwkv-5", filename=vision_remote_path)
vision_state_dict = torch.load(vision_local_path, map_location='cpu')
visual_encoder.load_state_dict(vision_state_dict)
image_processor = CLIPImageProcessor.from_pretrained(vision_tower_name)
##########################################################################
def generate_prompt(instruction):
    instruction = instruction.strip().replace('\r\n','\n').replace('\n\n','\n')
    return f"\n{instruction}\n\nAssistant:"

def generate(
    ctx,
    image_features,
    token_count=200,
    temperature=1.0,
    top_p=0.7,
    presencePenalty = 0.1,
    countPenalty = 0.1,
):
    args = PIPELINE_ARGS(temperature = max(0.2, float(temperature)), top_p = float(top_p),
                     alpha_frequency = countPenalty,
                     alpha_presence = presencePenalty,
                     token_ban = [], # ban the generation of some tokens
                     token_stop = [0]) # stop generation whenever you see any token here
    ctx = ctx.strip()
    all_tokens = []
    out_last = 0
    out_str = ''
    occurrence = {}
    for i in range(int(token_count)):
        if i == 0:
            input_ids = pipeline.encode(ctx)
            text_embs = model.w['emb.weight'][input_ids]
            input_embs = torch.cat((image_features, text_embs), dim=0)[-ctx_limit:]
            out, state = model.forward(embs=input_embs, state=None)
        else:
            input_ids = [token]
            out, state = model.forward(input_ids, state)
        for n in occurrence:
            out[n] -= (args.alpha_presence + occurrence[n] * args.alpha_frequency)

        token = pipeline.sample_logits(out, temperature=args.temperature, top_p=args.top_p)
        if token in args.token_stop:
            break
        all_tokens += [token]
        for xxx in occurrence:
            occurrence[xxx] *= 0.996        
        if token not in occurrence:
            occurrence[token] = 1
        else:
            occurrence[token] += 1
        
        tmp = pipeline.decode(all_tokens[out_last:])
        if '\ufffd' not in tmp:
            out_str += tmp
            yield out_str.strip()
            out_last = i + 1

    del out
    del state
    gc.collect()
    yield out_str.strip()


##########################################################################
cur_dir = os.path.dirname(os.path.abspath(__file__))
examples = [
    [
        f"{cur_dir}/examples_extreme_ironing.jpg",
        "What is unusual about this image?",
    ],
    [
        f"{cur_dir}/examples_waterview.jpg",
        "What are the things I should be cautious about when I visit here?",
    ]
]
def chatbot(image, question):
    image = image_processor(images=image.convert('RGB'), return_tensors='pt')['pixel_values']
    image_features = visual_encoder.encode_images(image.unsqueeze(0)).squeeze(0) # [L, D]
    input_text = generate_prompt(question)
    for output in generate(input_text, image_features):
        yield output

with gr.Blocks(title=title) as demo:
    with gr.Row():
        with gr.Column():
            image = gr.Image(type='pil', label="Image")
        with gr.Column():
            prompt = gr.Textbox(lines=5, label="Prompt", 
                value="Please upload an image and ask a question.")
            with gr.Row():
                submit = gr.Button("Submit", variant="primary")
                clear = gr.Button("Clear", variant="secondary") 
        with gr.Column():
            output = gr.Textbox(label="Output", lines=7)
    data = gr.Dataset(components=[image, prompt], samples=examples, label="Examples", headers=["Image", "Prompt"])
    submit.click(chatbot, [image, prompt], [output])
    clear.click(lambda: None, [], [output])
    data.click(lambda x: x, [data], [image, prompt])

demo.queue(max_size=10)
demo.launch(share=False)