import torch
import sys
import dataset
import engine
from model import BERTBaseUncased
from tokenizer import tokenizer
import config


T = tokenizer.TweetTokenizer(
    preserve_handles=True, preserve_hashes=True, preserve_case=False, preserve_url=False)

def preprocess(text):
    tokens = T.tokenize(text)
    print(tokens, file=sys.stderr)
    ptokens = []
    for index, token in enumerate(tokens):
        if "@" in token:
            if index > 0:
                # check if previous token was mention
                if "@" in tokens[index-1]:
                    pass
                else:
                    ptokens.append("mention_0")
            else:
                ptokens.append("mention_0")
        else:
            ptokens.append(token)

    print(ptokens, file=sys.stderr)
    return " ".join(ptokens)


def sentence_prediction(sentence):
    sentence = preprocess(sentence)
    model_path = config.MODEL_PATH

    test_dataset = dataset.BERTDataset(
        review=[sentence],
        target=[0]
    )

    test_data_loader = torch.utils.data.DataLoader(
        test_dataset,
        batch_size=config.VALID_BATCH_SIZE,
        num_workers=3
    )

    device = config.device

    model = BERTBaseUncased()
    model.load_state_dict(torch.load(
        model_path, map_location=torch.device(device)))
    model.to(device)

    outputs, [] = engine.predict_fn(test_data_loader, model, device)
    print(outputs)
    return {"label":outputs[0]}

demo = gr.Interface(
    fn=sentence_prediction, 
    inputs=gr.Textbox(placeholder="Enter a  sentence here..."), 
    outputs="label", 
    # interpretation="default",
    examples=[["!"]])

demo.launch()