import requests
import shutil,os,re
import datetime

# Searching for the videos
def search_pexels(keyword, api_key, orientation='potrait', size='medium', endpoint='videos', num_pages=50):
    
  if orientation not in ['potrait', 'landscape', 'square']:
    raise Exception("Error! orientation must be one of {'square', 'landscape', 'potrait'}")

  if size not in ['medium', 'small', 'large']:
    raise Exception("Error! size must be one of ['medium', 'small', 'large']")

  base_url = 'https://api.pexels.com/'

  headers = {
      'Authorization': f'{api_key}'
  }

  url = f'{base_url}{endpoint}/search?query={keyword}&per_page={num_pages}&orientation={orientation}&size={size}'


  response = requests.get(url, headers=headers)

  # Check if request was successful (status code 200)
  if response.status_code == 200:
      data = response.json()
      return data
  else:
      print(f'Error: {response.status_code}')


# Video download function
def download_video(data, parent_path, height, width, links, i):
    for x in data['videos'] :
        if x['id'] in links:
            continue
        
        vid = x['video_files']
        for v in vid: 
            if v['height'] == height and v['width'] == width :
                with open(f"{os.path.join(parent_path,str(i) + '_' + str(v['id']))}.mp4", 'bw') as f:
                    f.write(requests.get(v['link']).content)
                    print("Sucessfully saved video in", os.path.join(parent_path,str(i) + '_' + str(v['id'])) + '.mp4')
                    return x['id']

def generate_voice(text, model, tokenizer):
    speeches = []
    for x in text:
        inputs = tokenizer(x, return_tensors="pt")

    with torch.no_grad():
        output = model(**inputs).waveform
    speeches.append(output)
    return speeches

# Utilizing the LLMs to find the relevant videos 
def generate_videos(text, api_key, orientation, height, width, model, tokenizer):
    links = []
    try :
        # Split the paragraph by sentences
        sentences = list(filter(None,[x.strip() for x in re.split(r'[^A-Za-z0-9 -]', text)]))
        
        # Create directory with the name
        di = str(datetime.datetime.now())
        if os.path.exists(di):
            shutil.rmtree(di)
        os.mkdir(di)
        
        # Generate video for every sentence
        print("Keyword :")
        for i,s in enumerate(sentences):
            # keyword = sum_llm_chain.run(s)
            print(i+1, ":", s)
            data = search_pexels(s, api_key, orientation.lower())
            link = download_video(data, di, height, width, links,i)
            links.append(link)
        
        speeches = generate_voice(sentences, model, tokenizer)

        sf.write("x.wav", torch.cat(speeches, 1)[0], 16500)
            
        print("Success! videos has been generated")
    except Exception as e :
        print("Error! Failed generating videos")
        print(e)
    
    return di, sentences