import spaces
from transformers import (
    AutoModelForCausalLM,
    AutoTokenizer,
    __version__,
    GenerationConfig,
)
from PIL import Image
import gradio as gr
import argparse
import tempfile

from PIL import Image
import easyocr
import torch

assert (
    __version__ == "4.32.0"
), "Please use transformers version 4.32.0, pip install transformers==4.32.0"

print("=== init OCR engine===")
reader = easyocr.Reader(
    ["en"],
    gpu=False
)  # this needs to run only once to load the model into memory

print("=== Success, Now the Captioner VLM===")

def get_easy_text(img_file):
    out = reader.readtext(img_file, detail=0, paragraph=True)
    if isinstance(out, list):
        return "\n".join(out)
    return out

model_name = "DigitalAgent/Captioner"
if torch.cuda.is_available():
    device = torch.device("cuda")
else:
    device = torch.device("cpu")
model = (
    AutoModelForCausalLM.from_pretrained(
        model_name, trust_remote_code=True
    ).to(device)
    .eval()
    .half()
)
tokenizer = AutoTokenizer.from_pretrained(model_name, trust_remote_code=True)
print("=== Success, Now serving===")
generation_config = GenerationConfig.from_dict(
    {
        "chat_format": "chatml",
        "do_sample": True,
        "eos_token_id": 151643,
        "max_new_tokens": 2048,
        "max_window_size": 6144,
        "pad_token_id": 151643,
        "repetition_penalty": 1.2,
        "top_k": 0,
        "top_p": 0.3,
        "transformers_version": "4.31.0",
    }
)

@spaces.GPU
def generate(image: Image):
    with tempfile.NamedTemporaryFile(suffix=".jpg", delete=True) as tmp:
        image.save(tmp.name)
        ocr_result = get_easy_text(tmp.name)
        text = f"Please describe the screenshot above in details.\nOCR Result:\n{ocr_result}"
        history = []
        input_data = [{"image": tmp.name}, {"text": text}]
        query = tokenizer.from_list_format(input_data)
        response, _ = model.chat(
            tokenizer, query=query, history=history, generation_config=generation_config
        )
        return response



demo = gr.Interface(
    fn=generate, inputs=[gr.Image(type="pil")], outputs=gr.Textbox(), concurrency_limit=1,
    examples="./examples",
    title="A Dense Captioner optimized for Graphical User Interface",
    description="[Paper](https://arxiv.org/abs/2404.06474) [Code](https://github.com/Berkeley-NLP/Agent-Eval-Refine) [Model](https://huggingface.co/Agent-Eval-Refine/Captioner) [Data](https://huggingface.co/datasets/Agent-Eval-Refine/GUI-Dense-Descriptions)"
)
demo.queue().launch()