import os
import cv2
import numpy as np
from gtts import gTTS
from mutagen.mp3 import MP3
import nltk
import ffmpeg
nltk.download('punkt')
from nltk.tokenize import sent_tokenize
from math import ceil
from segmindapi import SD2_1, Kadinsky
import gradio as gr

class Videobook:

  def get_sentences(self, story):
    return sent_tokenize(story)

  def generate_voice(self, story, sentences , path = 'tts.mp3'):
    for i,n in enumerate(sentences):
        tts=gTTS(n,lang='en')
        tts.save('tts'+str(i)+'.mp3')
    lgth=[]
    for i in range(len(sentences)):
        lgth.append(MP3('tts'+str(i)+'.mp3').info.length)
        os.remove(os.path.join(os.getcwd(),'tts'+str(i)+'.mp3'))
    tts=gTTS(story,lang='en')
    tts.save(path)
    return lgth

  def generate_imgs(self, sentences, steps):
    imgs = []
    for sentence in sentences:
      sentence = self.style + ' of ' + sentence + ', ' + self.tags
      imgs.append(self.pipe.generate(sentence, num_inference_steps = steps))
    return imgs

  def addBuffer(self, imgs, lgth):
    imgs_buff = []
    for i,img in enumerate(imgs):
      for j in range(ceil(lgth[i] * self.fps)):
        imgs_buff.append(img)
    return imgs_buff

  def imgs_to_video(self, imgs, video_name='video.mp4'):
    video_dims = (imgs[0].width, imgs[0].height)
    fourcc = cv2.VideoWriter_fourcc(*'DIVX')    
    video = cv2.VideoWriter(video_name, fourcc, self.fps, video_dims)
    for img in imgs:
      tmp_img = img.copy()
      video.write(cv2.cvtColor(np.array(tmp_img), cv2.COLOR_RGB2BGR))
    video.release()

  def make_video(self, imgs, lengths, video_name = "finished_video.mp4"):
    self.imgs_to_video(self.addBuffer(imgs, lengths), 'test_video.mp4')
    input_audio = ffmpeg.input(os.path.join(os.getcwd(),'tts.mp3'))
    input_video = ffmpeg.input(os.path.join(os.getcwd(),'test_video.mp4'))
    ffmpeg.concat(input_video, input_audio, v=1, a=1).output(video_name).run(overwrite_output=True)
    

  def generate(self, story, api_key, fps, style, tags, model, steps):
    self.fps = fps
    self.style = style
    self.tags = tags
    if model == "Stable Diffusion v2.1":
      self.pipe = SD2_1(api_key)
    else:
      self.pipe = Kadinsky(api_key)
    sentences = self.get_sentences(story)
    lengths = self.generate_voice(story, sentences)
    images = self.generate_imgs(sentences, steps)
    self.make_video(images, lengths)
    return "finished_video.mp4"