app.py

import gradio as gr
from PIL import Image
from transformers import BlipProcessor, BlipForConditionalGeneration
from groq import Groq

# ==============================
# LOAD MODEL (ONCE)
# ==============================
processor = BlipProcessor.from_pretrained(
    "Salesforce/blip-image-captioning-base"
)
model = BlipForConditionalGeneration.from_pretrained(
    "Salesforce/blip-image-captioning-base"
)

# ==============================
# CORE FUNCTION
# ==============================
def generate_caption(api_key, image, style):
    try:
        if not api_key or api_key.strip() == "":
            return "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"

        if image is None:
            return "❌ Please upload an image."

        if image.mode != "RGB":
            image = image.convert("RGB")

        # Image → basic caption
        inputs = processor(image, return_tensors="pt")
        output = model.generate(**inputs, max_new_tokens=30)
        basic_caption = processor.decode(
            output[0], skip_special_tokens=True
        )

        # Groq refinement
        client = Groq(api_key=api_key)

        prompt = f"""
Rewrite the following image caption in a {style.lower()} style.
Keep it short (1–2 lines).

Caption:
"{basic_caption}"
"""

        response = client.chat.completions.create(
            model="llama-3.3-70b-versatile",
            messages=[{"role": "user", "content": prompt}],
            temperature=0.7,
        )

        refined = response.choices[0].message.content

        return (
            f"🖼️ **Basic Caption:** {basic_caption}\n\n"
            f"✨ **AI Refined Caption ({style}):**\n{refined}"
        )

    except Exception as e:
        return f"❌ Error:\n{str(e)}"

# ==============================
# UI
# ==============================
with gr.Blocks(theme=gr.themes.Soft()) as app:
    gr.Markdown("""
    # 🖼️ Image Caption Generator  
    Image → Caption → Groq AI ✨  
    Hugging Face Deployment
    """)

    api_key = gr.Textbox(
        label="🔑 Groq API Key",
        type="password",
        placeholder="Paste your Groq API key here"
    )

    image = gr.Image(type="pil", label="📷 Upload Image")

    style = gr.Dropdown(
        ["Normal", "Creative", "Fun / Gen-Z"],
        value="Normal",
        label="🎨 Caption Style"
    )

    btn = gr.Button("🚀 Generate Caption")
    output = gr.Markdown()

    btn.click(
        generate_caption,
        inputs=[api_key, image, style],
        outputs=output
    )

app.launch()