import streamlit as st
from transformers import pipeline
import textwrap
import numpy as np
import soundfile as sf
import tempfile
import os
from PIL import Image
import string
import re

# Initialize pipelines with caching
@st.cache_resource
def load_pipelines():
    captioner = pipeline("image-to-text", model="Salesforce/blip-image-captioning-large")
    storyer = pipeline("text-generation", model="gpt2")
    tts = pipeline("text-to-speech", model="facebook/mms-tts-eng")
    return captioner, storyer, tts

captioner, storyer, tts = load_pipelines()

# Function to clean raw story
def clean_generated_story(raw):
    allowed_pattern = re.compile(r'[a-zA-Z0-9.,!?"\'-]+\b(?<!\b\w\b)')
    return ' '.join(word for word in re.findall(allowed_pattern, raw) if len(word) > 1)

# Function to generate content from an image
def generate_content(image):
    pil_image = Image.open(image)
    
    # Generate caption
    caption = captioner(pil_image)[0]["generated_text"]
    st.write("**What's in the picture: 🧐**")
    st.write(caption)

    # Create prompt for story
    prompt = (
        f"Write a funny, interesting children's story centered on this scene: {caption}\n"
        f"Story in third-person narrative, describing this scene exactly: {caption} "
        f"Mention the exact place, location, or venue within {caption}. "
        f"Avoid numbers, random letter combinations, and single-letter words.")

    # Generate raw story
    raw = storyer(
        prompt,
        max_new_tokens=100,  
        temperature=0.6,    
        top_p=0.85,          
        no_repeat_ngram_size=0, 
        return_full_text=False
    )[0]["generated_text"].strip()

    # Generate story and audio
    caption, story, audio_path = generate_story(raw, caption, tts)
    return caption, story, audio_path

# Function to generate story and audio
def generate_story(raw, caption, tts):  
    # Clean and trim story
    story = clean_generated_story(raw)
    words = story.split()
    story = " ".join(words[:100])
    
    # Display story in Streamlit
    st.write("** Your funny story: 📝**")
    st.write(story)
    
    # Generate audio from cleaned story
    chunks = textwrap.wrap(story, width=200)
    audio = np.concatenate([tts(chunk)["audio"].squeeze() for chunk in chunks])

    # Save audio to temporary file
    with tempfile.NamedTemporaryFile(delete=False, suffix=".wav") as temp_file:
        sf.write(temp_file.name, audio, tts.model.config.sampling_rate)
        temp_file_path = temp_file.name

    return caption, story, temp_file_path

# Streamlit UI
st.title("😎 Story Maker")
st.markdown("Upload a picture, I will generate a story for you")

uploaded_image = st.file_uploader("Choose your picture", type=["jpg", "jpeg", "png"])

# Display image
if uploaded_image is None:
    st.image("https://via.placeholder.com/300", caption="Upload your picture here!", use_container_width=True)
else:
    st.image(uploaded_image, caption="Your Picture", use_container_width=True)

if st.button("Generate a story"):
    if uploaded_image is not None:
        with st.spinner("Processing"):
            try:
                caption, story, audio_path = generate_content(uploaded_image)
                st.success("Your story is ready! 😊")
                st.audio(audio_path, format="audio/wav")
                try:
                    os.remove(audio_path)
                except OSError as e:
                    st.warning(f"Failed to delete temporary audio file: {e}")
            except Exception as e:
                st.error(f"Error generating story: {e}")
    else:
        st.warning("Please upload a picture first!")