# MIT License
#
# Copyright (c) 2022- CNRS
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import torch
import io
import base64
import numpy as np
import scipy.io.wavfile
from typing import Text
import streamlit as st
from pyannote.audio import Pipeline
from pyannote.audio import Audio
from pyannote.audio.pipelines.utils.hook import TimingHook
from pyannote.core import Segment


import streamlit.components.v1 as components


def to_base64(waveform: np.ndarray, sample_rate: int = 16000) -> Text:
    """Convert waveform to base64 data"""
    waveform /= np.max(np.abs(waveform)) + 1e-8
    with io.BytesIO() as content:
        scipy.io.wavfile.write(content, sample_rate, waveform)
        content.seek(0)
        b64 = base64.b64encode(content.read()).decode()
        b64 = f"data:audio/x-wav;base64,{b64}"
    return b64


PYANNOTE_LOGO = "https://avatars.githubusercontent.com/u/7559051?s=400&v=4"
EXCERPT = 120

st.set_page_config(page_title="pyannote pretrained pipelines", page_icon=PYANNOTE_LOGO)

col1, col2 = st.columns([0.2, 0.8], gap="small")

with col1:
    st.image(PYANNOTE_LOGO)

with col2:
    st.markdown(
        """
# pretrained pipelines
Make the most of [pyannote](https://github.com/pyannote) thanks to our [consulting services](https://herve.niderb.fr/consulting.html)
"""
    )


PIPELINES = [
    "pyannote/speaker-diarization-3.1",
    # "pyannote/speaker-diarization-3.0",
]

audio = Audio(sample_rate=16000, mono=True)

selected_pipeline = st.selectbox("Select a pretrained pipeline", PIPELINES, index=0)


with st.spinner("Loading pipeline..."):
    try:
        use_auth_token = st.secrets["PYANNOTE_TOKEN"]
    except FileNotFoundError:
        use_auth_token = None
    except KeyError:
        use_auth_token = None

    pipeline = Pipeline.from_pretrained(
        selected_pipeline, use_auth_token=use_auth_token
    )
    if torch.cuda.is_available():
        pipeline.to(torch.device("cuda"))

uploaded_file = st.file_uploader("Upload an audio file")
if uploaded_file is not None:
    try:
        duration = audio.get_duration(uploaded_file)
    except RuntimeError as e:
        st.error(e)
        st.stop()

    spinner_message = (
        f"Processing {duration:.0f}s file... "
        if duration < EXCERPT
        else f"Processing first {EXCERPT:.0f}s of file..."
    )

    duration = min(duration, EXCERPT)
    waveform, sample_rate = audio.crop(uploaded_file, Segment(0, duration))
    uri = "".join(uploaded_file.name.split())
    file = {"waveform": waveform, "sample_rate": sample_rate, "uri": uri}

    with st.spinner(spinner_message):
        with TimingHook() as hook:
            output = pipeline(file, hook=hook)

    processing_time = file["timing"]["total"]
    faster_than_real_time = duration / processing_time
    st.success(
        f"Processed {duration:.0f}s of audio in {processing_time:.1f}s ({faster_than_real_time:.1f}x faster than real-time)",
        icon="✅",
    )

    with open("assets/template.html") as html, open("assets/style.css") as css:
        html_template = html.read()
        st.markdown("<style>{}</style>".format(css.read()), unsafe_allow_html=True)

    colors = [
        "#ffd70033",
        "#00ffff33",
        "#ff00ff33",
        "#00ff0033",
        "#9932cc33",
        "#00bfff33",
        "#ff7f5033",
        "#66cdaa33",
    ]
    num_colors = len(colors)

    label2color = {
        label: colors[k % num_colors] for k, label in enumerate(sorted(output.labels()))
    }

    BASE64 = to_base64(waveform.numpy().T)

    REGIONS = ""
    for segment, _, label in output.itertracks(yield_label=True):
        REGIONS += f"regions.addRegion({{start: {segment.start:g}, end: {segment.end:g}, color: '{label2color[label]}', resize : false, drag : false}});"

    html = html_template.replace("BASE64", BASE64).replace("REGIONS", REGIONS)
    components.html(html, height=250, scrolling=True)

    with io.StringIO() as fp:
        output.write_rttm(fp)
        content = fp.getvalue()
        b64 = base64.b64encode(content.encode()).decode()
        href = f'<a download="{output.uri}.rttm" href="data:file/text;base64,{b64}">Download</a> result in RTTM file format or run it locally:'
        st.markdown(href, unsafe_allow_html=True)

    code = f"""
# load pretrained pipeline
from pyannote.audio import Pipeline
pipeline = Pipeline.from_pretrained("{selected_pipeline}", 
                                    use_auth_token=HUGGINGFACE_TOKEN)

# (optional) send pipeline to GPU
import torch
pipeline.to(torch.device("cuda"))

# process audio file
output = pipeline("audio.wav")"""
    st.code(code, language="python")