app.py

import os
import time
import streamlit as st
from PIL import Image
from io import BytesIO
from transformers import pipeline
from huggingface_hub import login
from gtts import gTTS
import tempfile

# —––––––– Requirements —–––––––
# pip install streamlit pillow gTTS transformers huggingface_hub

# —––––––– Page Config —–––––––
st.set_page_config(page_title="Magic Story Generator (Local Pipeline)", layout="centered")
st.title("📖✨ Turn Images into Children's Stories")

# —––––––– Load Clients & Pipelines (cached) —–––––––
@st.cache_resource(show_spinner=False)
def load_clients():
    # Authenticate to pull private or remote-code models if needed
    hf_token = st.secrets.get("HF_TOKEN")
    if hf_token:
        os.environ["HUGGINGFACEHUB_API_TOKEN"] = hf_token
        login(hf_token)

    # 1) Image-captioning pipeline (BLIP)
    captioner = pipeline(
        task="image-to-text",
        model="Salesforce/blip-image-captioning-base",
        device=-1  # CPU; change to 0 for GPU
    )

    # 2) Story-generation pipeline (DeepSeek-R1-Distill-Qwen)
    storyteller = pipeline(
        task="text-generation",
        model="deepseek-ai/DeepSeek-R1-Distill-Qwen-1.5B",
        tokenizer="deepseek-ai/DeepSeek-R1-Distill-Qwen-1.5B",
        trust_remote_code=True,
        device=-1,                # CPU; set 0+ for GPU
        temperature=0.6,
        top_p=0.9,
        repetition_penalty=1.1,
        no_repeat_ngram_size=2,
        max_new_tokens=120,
        return_full_text=False
    )

    return captioner, storyteller

captioner, storyteller = load_clients()

# —––––––– Helpers —–––––––
def generate_caption(img: Image.Image) -> str:
    # Use the BLIP pipeline to generate a caption
    result = captioner(img)
    if isinstance(result, list) and result:
        return result[0].get("generated_text", "").strip()
    return ""


def generate_story(caption: str) -> str:
    # Build a simple prompt incorporating the caption
    prompt = (
        f"Image description: {caption}\n"
        "Write a coherent 50-100 word children's story that flows naturally."
    )

    t0 = time.time()
    outputs = storyteller(
        prompt
    )
    gen_time = time.time() - t0
    st.text(f"⏱ Generated in {gen_time:.1f}s")

    story = outputs[0].get("generated_text", "").strip()
    # Truncate to 100 words
    words = story.split()
    if len(words) > 100:
        story = " ".join(words[:100]) + ('.' if not story.endswith('.') else '')
    return story

# —––––––– Main App —–––––––
uploaded = st.file_uploader("Upload an image:", type=["jpg", "png", "jpeg"])
if uploaded:
    img = Image.open(uploaded).convert("RGB")
    if max(img.size) > 2048:
        img.thumbnail((2048, 2048))
    st.image(img, use_container_width=True)

    with st.spinner("🔍 Generating caption..."):
        caption = generate_caption(img)
    if not caption:
        st.error("😢 Couldn't understand this image. Try another one!")
        st.stop()
    st.success(f"**Caption:** {caption}")

    with st.spinner("📝 Writing story..."):
        story = generate_story(caption)

    st.subheader("📚 Your Magical Story")
    st.write(story)

    with st.spinner("🔊 Converting to audio..."):
        try:
            tts = gTTS(text=story, lang="en", slow=False)
            with tempfile.NamedTemporaryFile(delete=False, suffix=".mp3") as fp:
                tts.save(fp.name)
                st.audio(fp.name, format="audio/mp3")
        except Exception as e:
            st.warning(f"⚠️ TTS failed: {e}")

# Footer
st.markdown("---\n*Made with ❤️ by your friendly story wizard*")