from flask import Flask, request, Response
from io import BytesIO
import ffmpeg
import base64
import os
import sys
import json
import math
import torch
from torch import nn
from torch.nn import functional as F
from torch.utils.data import DataLoader

import time
import commons
import utils
from models import SynthesizerTrn
from text.symbols import symbols
from text import cleaned_text_to_sequence,_symbol_to_id, get_bert
from text.cleaner import clean_text
from scipy.io import wavfile

# Get ffmpeg path
ffmpeg_path = os.path.join(os.path.dirname(os.path.abspath(__file__)), "ffmpeg")

# Flask Init
app = Flask(__name__)
app.config['JSON_AS_ASCII'] = False
def get_text(text, language_str, hps):
    norm_text, phone, tone, word2ph = clean_text(text, language_str)
    print([f"{p}{t}" for p, t in zip(phone, tone)])
    phone, tone, language = cleaned_text_to_sequence(phone, tone, language_str)

    if hps.data.add_blank:
        phone = commons.intersperse(phone, 0)
        tone = commons.intersperse(tone, 0)
        language = commons.intersperse(language, 0)
        for i in range(len(word2ph)):
            word2ph[i] = word2ph[i] * 2
        word2ph[0] += 1
    bert = get_bert(norm_text, word2ph, language_str)

    assert bert.shape[-1] == len(phone)

    phone = torch.LongTensor(phone)
    tone = torch.LongTensor(tone)
    language = torch.LongTensor(language)

    return bert, phone, tone, language

def infer(text, sdp_ratio, noise_scale, noise_scale_w,length_scale,sid):
    bert, phones, tones, lang_ids = get_text(text,"ZH", hps,)
    with torch.no_grad():
        x_tst=phones.to(dev).unsqueeze(0)
        tones=tones.to(dev).unsqueeze(0)
        lang_ids=lang_ids.to(dev).unsqueeze(0)
        bert = bert.to(dev).unsqueeze(0)
        x_tst_lengths = torch.LongTensor([phones.size(0)]).to(dev)
        speakers = torch.LongTensor([hps.data.spk2id[sid]]).to(dev)
        audio = net_g.infer(x_tst, x_tst_lengths, speakers, tones, lang_ids,bert, sdp_ratio=sdp_ratio
                           , noise_scale=noise_scale, noise_scale_w=noise_scale_w, length_scale=length_scale)[0][0,0].data.cpu().float().numpy()
        return audio

def replace_punctuation(text, i=2):
    punctuation = "，。？！"
    for char in punctuation:
        text = text.replace(char, char * i)
    return text

# Load Generator
hps = utils.get_hparams_from_file("./configs/config.json")

dev='cuda'
net_g = SynthesizerTrn(
    len(symbols),
    hps.data.filter_length // 2 + 1,
    hps.train.segment_size // hps.data.hop_length,
    n_speakers=hps.data.n_speakers,
    **hps.model).to(dev)
_ = net_g.eval()

_ = utils.load_checkpoint("logs/all_in_one/G_521000.pth", net_g, None)

@app.route("/",methods=['GET','POST'])
def main():
    if request.method == 'GET':
        try:
            speaker = request.args.get('speaker')
            text = request.args.get('text').replace("/n","")
            sdp_ratio = float(request.args.get("sdp_ratio", 0.2))
            noise = float(request.args.get("noise", 0.5))
            noisew = float(request.args.get("noisew", 0.6))
            length = float(request.args.get("length", 1.2))
            if length >= 2:
                return "Too big length"
            if len(text) >=200:
                return "Too long text"
            fmt = request.args.get("format", "wav")
            if None in (speaker, text):
                return "Missing Parameter"
            if fmt not in ("mp3", "wav"):
                return "Invalid Format"
        except:
            return "Invalid Parameter"


        with torch.no_grad():
            audio = infer(text, sdp_ratio=sdp_ratio, noise_scale=noise, noise_scale_w=noisew, length_scale=length, sid=speaker)
        wav = BytesIO()
        wavfile.write(wav, hps.data.sampling_rate, audio)
        torch.cuda.empty_cache()
        if fmt == "mp3":
            process = (
	        ffmpeg
            .input("pipe:", format='wav', channel_layout="mono")
            .output("pipe:", format='mp3', audio_bitrate="320k")
            .run_async(pipe_stdin=True, pipe_stdout=True, pipe_stderr=True, cmd=ffmpeg_path)
        )
            out, _ = process.communicate(input=wav.read())
            return Response(out, mimetype="audio/mpeg")
        return Response(wav.read(), mimetype="audio/wav")
