import os
from pathlib import Path
from typing import List
from loguru import logger as log

import requests
import streamlit as st

from footer import footer
from header import header
from helpers import (
    load_audio_segment,
    load_list_of_songs,
    plot_audio,
    st_local_audio,
    url_is_valid,
    file_size_is_valid,
    delete_old_files,
)
from service.demucs_runner import separator
from service.vocal_remover.runner import load_model, separate
from streamlit_option_menu import option_menu


label_sources = {
    "no_vocals.mp3": "🎶 Instrumental",
    "vocals.mp3": "🎤 Vocals",
    "drums.mp3": "🥁 Drums",
    "bass.mp3": "🎸 Bass",
    "guitar.mp3": "🎸 Guitar",
    "piano.mp3": "🎹 Piano",
    "other.mp3": "🎶 Other",
}

separation_mode_to_model = {
    "Vocals & Instrumental (Faster)": ("vocal_remover", ["vocals.mp3", "no_vocals.mp3"]),
    "Vocals & Instrumental (High Quality, Slower)": ("htdemucs", ["vocals.mp3", "no_vocals.mp3"]),
    "Vocals, Drums, Bass & Other (Slower)": (
        "htdemucs",
        ["vocals.mp3", "drums.mp3", "bass.mp3", "other.mp3"],
    ),
    "Vocal, Drums, Bass, Guitar, Piano & Other (Slowest)": (
        "htdemucs_6s",
        ["vocals.mp3", "drums.mp3", "bass.mp3", "guitar.mp3", "piano.mp3", "other.mp3"],
    ),
}

extensions = ["mp3", "wav", "ogg", "flac"]

out_path = Path("/tmp")
in_path = Path("/tmp")


@st.cache_data(show_spinner=False)
def get_sources(path, file_sources):
    sources = {}
    for file in file_sources:
        fullpath = path / file
        if fullpath.exists():
            sources[file] = fullpath
    return sources


def reset_execution():
    st.session_state.executed = False


def show_results(model_name: str, dir_name_output: str, file_sources: List):
    sources = get_sources(out_path / Path(model_name) / dir_name_output, file_sources)
    tab_sources = st.tabs([f"**{label_sources.get(k)}**" for k in sources.keys()])
    for i, (file, pathname) in enumerate(sources.items()):
        with tab_sources[i]:
            cols = st.columns(2)
            with cols[0]:
                auseg = load_audio_segment(pathname, "mp3")
                st.image(
                    plot_audio(
                        auseg,
                        32767,
                        file=file,
                        model_name=model_name,
                        dir_name_output=dir_name_output,
                    ),
                    use_column_width="always",
                )
            with cols[1]:
                st_local_audio(pathname, key=f"output_{file}_{dir_name_output}")
    log.info(f"Displaying results for {dir_name_output} - {model_name}")


def body():
    filename = None
    name_song = None
    st.markdown(
        """<style>
        div[data-baseweb="tab-list"] {
            display: flex !important;
            align-items: center !important;
            justify-content: space-evenly !important;
            flex-wrap: wrap !important;
                .css-q8sbsg.e16nr0p34 p{
                    font-size: 1.1rem !important;
                }
        }
        </style>""",
        unsafe_allow_html=True,
    )

    cols = st.columns([1, 6, 1, 4, 1])
    with cols[1]:
        with st.columns([1, 8, 1])[1]:
            option = option_menu(
                menu_title=None,
                options=["Upload File", "From URL", "Examples"],
                icons=["cloud-upload-fill", "link-45deg", "music-note-list"],
                orientation="horizontal",
                styles={
                    "container": {
                        "width": "100%",
                        "height": "3.5rem",
                        "margin": "0px",
                        "padding": "0px",
                    },
                    "icon": {"font-size": "1rem"},
                    "nav-link": {
                        "display": "flex",
                        "height": "3rem",
                        "justify-content": "center",
                        "align-items": "center",
                        "text-align": "center",
                        "flex-direction": "column",
                        "font-size": "1rem",
                        "padding-left": "0px",
                        "padding-right": "0px",
                    },
                },
                key="option_separate",
            )
        if option == "Upload File":
            uploaded_file = st.file_uploader(
                "Choose a file",
                type=extensions,
                key="file",
                help="Supported formats: mp3, wav, ogg, flac.",
            )
            if uploaded_file is not None:
                with st.spinner("Loading audio..."):
                    with open(in_path / uploaded_file.name, "wb") as f:
                        f.write(uploaded_file.getbuffer())
                    filename = uploaded_file.name
                    st.audio(uploaded_file)

        elif option == "From URL":
            url = st.text_input(
                "Paste the URL of the audio file",
                key="url_input",
                help="Supported formats: mp3, wav, ogg, flac.",
            )

            if url != "" and url_is_valid(url):
                with st.spinner("Downloading audio..."):
                    filename = url.split("/")[-1]
                    response = requests.get(url, stream=True)
                    if response.status_code == 200 and file_size_is_valid(response):
                        with open(in_path / filename, "wb") as audio_file:
                            for chunk in response.iter_content(chunk_size=1024):
                                if chunk:
                                    audio_file.write(chunk)
                        st_local_audio(in_path / filename, key="input_from_url")
                    else:
                        st.error("Failed to download audio file.")
                        filename = None

        elif option == "Examples":
            samples_song = load_list_of_songs(path="separate_songs.json")
            if samples_song is not None:
                name_song = st.selectbox(
                    label="Select a song",
                    options=list(samples_song.keys()),
                    format_func=lambda x: x.replace("_", " "),
                    index=1,
                    key="select_example",
                )
                if (Path("/tmp") / name_song).exists():
                    st_local_audio(Path("/tmp") / name_song, key=f"input_from_sample_{name_song}")
                else:
                    name_song = None

    with cols[3]:
        separation_mode = st.selectbox(
            "Choose the separation mode",
            [
                "Vocals & Instrumental (Faster)",
                "Vocals & Instrumental (High Quality, Slower)",
                "Vocals, Drums, Bass & Other (Slower)",
                "Vocal, Drums, Bass, Guitar, Piano & Other (Slowest)",
            ],
            on_change=reset_execution(),
            key="separation_mode",
        )
        if separation_mode == "Vocals & Instrumental (Faster)":
            max_duration = 30
        else:
            max_duration = 15
        model_name, file_sources = separation_mode_to_model[separation_mode]

    if filename is not None:
        song = load_audio_segment(in_path / filename, filename.split(".")[-1])
        n_secs = round(len(song) / 1000)
        if os.environ.get("ENV_LIMITATION", False):
            with cols[3]:
                start_time = st.number_input(
                    "Choose the start time",
                    min_value=0,
                    max_value=n_secs,
                    step=1,
                    value=0,
                    help=f"Maximum duration is {max_duration} seconds for this separation mode. Duplicate this space to remove any limit.",
                    format="%d",
                )
                st.session_state.start_time = start_time
                end_time = min(start_time + max_duration, n_secs)
                song = song[start_time * 1000 : end_time * 1000]
                st.info(
                    f"Audio source will be processed from {start_time} to {end_time} seconds. Duplicate this space to remove any limit.",
                    icon="⏱",
                )
        else:
            start_time = 0
            end_time = n_secs
        with st.columns([2, 1, 2])[1]:
            execute = st.button(
                "Separate Music Sources 🎶", type="primary", use_container_width=True
            )
        if execute or st.session_state.executed:
            if execute:
                st.session_state.executed = False

            if not st.session_state.executed:
                log.info(f"{option} - Separating {filename} with {separation_mode}...")
                song.export(in_path / filename, format=filename.split(".")[-1])
                with st.columns([1, 1, 1])[1]:
                    with st.spinner("Separating source audio, it will take a while..."):
                        if model_name == "vocal_remover":
                            model, device = load_model(pretrained_model="baseline.pth")
                            separate(
                                input=in_path / filename,
                                model=model,
                                device=device,
                                output_dir=out_path,
                            )
                        else:
                            stem = None
                            if separation_mode == "Vocals & Instrumental (High Quality, Slower)":
                                stem = "vocals"

                            separator(
                                tracks=[in_path / filename],
                                out=out_path,
                                model=model_name,
                                shifts=1,
                                overlap=0.5,
                                stem=stem,
                                int24=False,
                                float32=False,
                                clip_mode="rescale",
                                mp3=True,
                                mp3_bitrate=320,
                                verbose=True,
                                start_time=start_time,
                                end_time=end_time,
                            )
            dir_name_output = ".".join(filename.split(".")[:-1])
            filename = None
            st.session_state.executed = True
            show_results(model_name, dir_name_output, file_sources)
    elif name_song is not None and option == "Examples":
        show_results(model_name, name_song, file_sources)


if __name__ == "__main__":
    header()
    body()
    footer()
    delete_old_files("/tmp", 60 * 30)