# import part
import streamlit as st
from transformers import pipeline
from PIL import Image

# function part
# img2text - Using a lighter model
def img2text(image):
    # Use a smaller, faster image captioning model
    image_to_text = pipeline("image-to-text", model="Salesforce/blip-image-captioning-base")
    text = image_to_text(image, max_new_tokens=20)[0]["generated_text"]
    return text

# text2story - Using a much faster model with constraints
def text2story(text):
    # Use a tiny model that's much faster
    generator = pipeline("text-generation", model="distilgpt2")
    
    # Create a more constrained prompt for faster generation
    prompt = f"A short children's story about {text}: Once upon a time, "
    
    # Generate with strict constraints for speed
    story_result = generator(
        prompt,
        max_new_tokens=100,  # Limit token generation
        num_return_sequences=1,
        temperature=0.7,
        top_k=50,
        do_sample=True
    )
   
    # Extract the generated text
    story_text = story_result[0]['generated_text']
    story_text = story_text.replace(prompt, "Once upon a time, ")
    
    # Find a natural ending point (end of sentence)
    last_period = story_text.rfind('.')
    last_question = story_text.rfind('?')
    last_exclamation = story_text.rfind('!')
    
    # Find the last sentence ending punctuation
    last_end = max(last_period, last_question, last_exclamation)
    
    if last_end > 0:
        # Truncate at the end of the last complete sentence
        story_text = story_text[:last_end + 1]
    
    return story_text

# text2audio - Using HelpingAI-TTS-v1 model
def text2audio(story_text):
    try:
        # Use the HelpingAI TTS model as requested
        synthesizer = pipeline("text-to-speech", model="HelpingAI/HelpingAI-TTS-v1")
        
        # Limit text length to avoid timeouts
        max_chars = 500
        if len(story_text) > max_chars:
            last_period = story_text[:max_chars].rfind('.')
            if last_period > 0:
                story_text = story_text[:last_period + 1]
            else:
                story_text = story_text[:max_chars]
        
        # Generate speech
        speech = synthesizer(story_text)
        
        return speech
        
    except Exception as e:
        st.error(f"Error generating audio: {str(e)}")
        return None

# main part
st.set_page_config(page_title="Your Image to Audio Story", page_icon="🦜")
st.header("Turn Your Image to Audio Story")
uploaded_file = st.file_uploader("Select an Image...")

if uploaded_file is not None:
    # Display the uploaded image
    st.image(uploaded_file, caption="Uploaded Image", use_container_width=True)
    
    # Convert the file to a PIL Image
    image = Image.open(uploaded_file)
    
    # Progress indicator
    progress_bar = st.progress(0)
    
    # Stage 1: Image to Text
    with st.spinner('Processing image caption...'):
        caption = img2text(image)
        progress_bar.progress(33)
    st.write(f"**Image caption:** {caption}")
    
    # Stage 2: Text to Story
    with st.spinner('Creating story...'):
        story = text2story(caption)
        progress_bar.progress(66)
    st.write(f"**Story:** {story}")
    
    # Stage 3: Story to Audio data
    with st.spinner('Generating audio...'):
        speech_output = text2audio(story)
        progress_bar.progress(100)
    
    # Play button
    if st.button("Play Audio"):
        if speech_output is not None:
            # Try to play the audio directly
            try:
                if 'audio' in speech_output and 'sampling_rate' in speech_output:
                    st.audio(speech_output['audio'], sample_rate=speech_output['sampling_rate'])
                elif 'audio_array' in speech_output and 'sampling_rate' in speech_output:
                    st.audio(speech_output['audio_array'], sample_rate=speech_output['sampling_rate'])
                elif 'waveform' in speech_output and 'sample_rate' in speech_output:
                    st.audio(speech_output['waveform'], sample_rate=speech_output['sample_rate'])
                else:
                    # Try the first array-like value as audio data
                    for key, value in speech_output.items():
                        if hasattr(value, '__len__') and len(value) > 1000:
                            if 'rate' in speech_output:
                                st.audio(value, sample_rate=speech_output['rate'])
                            elif 'sample_rate' in speech_output:
                                st.audio(value, sample_rate=speech_output['sample_rate'])  
                            elif 'sampling_rate' in speech_output:
                                st.audio(value, sample_rate=speech_output['sampling_rate'])
                            else:
                                st.audio(value, sample_rate=24000)  # Default sample rate
                            break
                    else:
                        st.error(f"Could not find compatible audio format in: {list(speech_output.keys())}")
            except Exception as e:
                st.error(f"Error playing audio: {str(e)}")
        else:
            st.error("Audio generation failed. Please try again.")