import streamlit as st
from model import generate
import io
import numpy as np
from scipy.io.wavfile import write

# -----
# Utils
# -----


@st.cache_data
def np_to_wav(waveform: np.Array, sample_rate: int) -> bytes:
    bytes_wav = bytes()
    byte_io = io.BytesIO(bytes_wav)
    write(byte_io, sample_rate, waveform.T)
    return byte_io.read()


# ------------------
# App initialization
# ------------------

if "result" not in st.session_state:
    st.session_state["result"] = None

# ---
# App
# ---

st.title("Sound Exploration")

col1, col2 = st.columns(2)
with col1:
    instrument = st.selectbox(
        "Which intrument do you want ?",
        (
            "🎸 Bass",
            "🎺 Brass",
            "🪈 Flute",
            "🪕 Guitar",
            "🎹 Keyboard",
            "🔨 Mallet",
            "🪗 Organ",
            "🎷 Reed",
            "🎻 String",
            "⚡ Synth lead",
            "🎤 Vocal",
        ),
    )
with col2:
    instrument_t = st.selectbox(
        "Which type intrument do you want ?",
        ("📯 Acoustic", "🎙️ Electronic", "🎛️ Synthetic"),
    )

with st.expander("Magical parameters 🪄"):
    col1, col2 = st.columns(2)
    with col1:
        p1 = st.slider("p1", 0.0, 1.0, step=0.001, label_visibility="collapsed")
        p2 = st.slider("p2", 0.0, 1.0, step=0.001, label_visibility="collapsed")
        p3 = st.slider("p3", 0.0, 1.0, step=0.001, label_visibility="collapsed")
    with col2:
        p4 = st.slider("p4", 0.0, 1.0, step=0.001, label_visibility="collapsed")
        p5 = st.slider("p5", 0.0, 1.0, step=0.001, label_visibility="collapsed")
        use_params = st.toggle("Use magical parameters ?")
    params = (p1, p2, p3, p4, p5) if use_params else None

if st.button("Generate ✨", type="primary"):
    st.session_state["result"] = generate([instrument, instrument_t], params)

if st.session_state["result"] is not None:
    col1, col2 = st.columns(2)
    with col1:
        st.audio(st.session_state["result"], sample_rate=16000)
    with col2:
        st.download_button(
            label="Download  ⬇️",
            data=np_to_wav(st.session_state["result"], 16000),
            file_name="result.wav",
        )