from math import ceil, floor
import streamlit.components.v1 as components
from transformers import (
    AutoModelForSeq2SeqLM,
    AutoTokenizer,
)
import streamlit as st
import sys
import os
import json
from urllib.parse import quote
from huggingface_hub import hf_hub_download

# Allow direct execution
sys.path.insert(0, os.path.join(os.path.dirname(os.path.abspath(__file__)), 'src'))  # noqa

from predict import SegmentationArguments, ClassifierArguments, predict as pred, seconds_to_time  # noqa
from evaluate import EvaluationArguments
from shared import device

st.set_page_config(
    page_title='SponsorBlock ML',
    page_icon='🤖',
    #  layout='wide',
    #  initial_sidebar_state="expanded",
    menu_items={
        'Get Help': 'https://github.com/xenova/sponsorblock-ml',
        'Report a bug': 'https://github.com/xenova/sponsorblock-ml/issues/new/choose',
        #  'About': "# This is a header. This is an *extremely* cool app!"
    }
)
# https://github.com/google-research/text-to-text-transfer-transformer#released-model-checkpoints
# https://github.com/google-research/text-to-text-transfer-transformer/blob/main/released_checkpoints.md#experimental-t5-pre-trained-model-checkpoints

# https://huggingface.co/docs/transformers/model_doc/t5
# https://huggingface.co/docs/transformers/model_doc/t5v1.1


# Faster caching system for predictions (No need to hash)
@st.cache(allow_output_mutation=True)
def persistdata():
    return {}

prediction_cache = persistdata()

MODELS = {
    'Small (77M)': {
        'pretrained': 'google/t5-v1_1-small',
        'repo_id': 'Xenova/sponsorblock-small',
    },
    'Base v1 (220M)': {
        'pretrained': 't5-base',
        'repo_id': 'EColi/sponsorblock-base-v1',
    },

    'Base v1.1 (250M)': {
        'pretrained': 'google/t5-v1_1-base',
        'repo_id': 'Xenova/sponsorblock-base',
    }
}

# Create per-model cache
for m in MODELS:
    if m not in prediction_cache:
        prediction_cache[m] = {}

CATGEGORY_OPTIONS = {
    'SPONSOR': 'Sponsor',
    'SELFPROMO': 'Self/unpaid promo',
    'INTERACTION': 'Interaction reminder',
}

CLASSIFIER_PATH = 'Xenova/sponsorblock-classifier'


@st.cache(allow_output_mutation=True)
def load_predict(model_id):
    model_info = MODELS[model_id]

    # Use default segmentation and classification arguments
    evaluation_args = EvaluationArguments(model_path=model_info['repo_id'])
    segmentation_args = SegmentationArguments()
    classifier_args = ClassifierArguments()

    model = AutoModelForSeq2SeqLM.from_pretrained(evaluation_args.model_path)
    model.to(device())

    tokenizer = AutoTokenizer.from_pretrained(evaluation_args.model_path)

    # Save classifier and vectorizer
    hf_hub_download(repo_id=CLASSIFIER_PATH,
                    filename=classifier_args.classifier_file,
                    cache_dir=classifier_args.classifier_dir,
                    force_filename=classifier_args.classifier_file,
                    )
    hf_hub_download(repo_id=CLASSIFIER_PATH,
                    filename=classifier_args.vectorizer_file,
                    cache_dir=classifier_args.classifier_dir,
                    force_filename=classifier_args.vectorizer_file,
                    )

    def predict_function(video_id):
        if video_id not in prediction_cache[model_id]:
            prediction_cache[model_id][video_id] = pred(
                video_id, model, tokenizer,
                segmentation_args=segmentation_args,
                classifier_args=classifier_args
            )
        return prediction_cache[model_id][video_id]

    return predict_function


def main():

    # Display heading and subheading
    st.write('# SponsorBlock ML')
    st.write('##### Automatically detect in-video YouTube sponsorships, self/unpaid promotions, and interaction reminders.')

    model_id = st.selectbox('Select model', MODELS.keys(), index=0)

    # Load prediction function
    predict = load_predict(model_id)

    video_id = st.text_input('Video ID:')  # , placeholder='e.g., axtQvkSpoto'

    categories = st.multiselect('Categories:',
                                CATGEGORY_OPTIONS.keys(),
                                CATGEGORY_OPTIONS.keys(),
                                format_func=CATGEGORY_OPTIONS.get
                                )

    # Hide segments with a confidence lower than
    confidence_threshold = st.slider(
        'Confidence Threshold (%):', min_value=0, max_value=100)

    video_id_length = len(video_id)
    if video_id_length == 0:
        return

    elif video_id_length != 11:
        st.exception(ValueError('Invalid YouTube ID'))
        return

    with st.spinner('Running model...'):
        predictions = predict(video_id)

    if len(predictions) == 0:
        st.success('No segments found!')
        return

    submit_segments = []
    for index, prediction in enumerate(predictions, start=1):
        if prediction['category'] not in categories:
            continue  # Skip

        confidence = prediction['probability'] * 100

        if confidence < confidence_threshold:
            continue

        submit_segments.append({
            'segment': [prediction['start'], prediction['end']],
            'category': prediction['category'].lower(),
            'actionType': 'skip'
        })
        start_time = seconds_to_time(prediction['start'])
        end_time = seconds_to_time(prediction['end'])
        with st.expander(
            f"[{prediction['category']}] Prediction #{index} ({start_time} \u2192 {end_time})"
        ):

            url = f"https://www.youtube-nocookie.com/embed/{video_id}?&start={floor(prediction['start'])}&end={ceil(prediction['end'])}"
            # autoplay=1controls=0&&modestbranding=1&fs=0

            # , width=None, height=None, scrolling=False
            components.iframe(url, width=670, height=376)

            text = ' '.join(w['text'] for w in prediction['words'])
            st.write(f"**Times:** {start_time} \u2192 {end_time}")
            st.write(
                f"**Category:** {CATGEGORY_OPTIONS[prediction['category']]}")
            st.write(f"**Confidence:** {confidence:.2f}%")
            st.write(f'**Text:** "{text}"')

    json_data = quote(json.dumps(submit_segments))
    link = f'[Submit Segments](https://www.youtube.com/watch?v={video_id}#segments={json_data})'
    st.markdown(link, unsafe_allow_html=True)


if __name__ == '__main__':
    main()