added gradio and app file

app.py

@@ -0,0 +1,4 @@
+from gradio_app import iface
+
+if __name__ == "__main__":
+    iface.launch()

gradio_app.py

@@ -0,0 +1,108 @@
+import gradio as gr
+from pathlib import Path
+import os
+import re
+
+from pipeline.ingest.pdf_parser import PDFParser
+from pipeline.ingest.docx_parser import DOCXParser
+from pipeline.ingest.txt_parser import TXTParser
+from pipeline.ingest.html_parser import HTMLParser
+from pipeline.chunking.fixed_chunker import FixedChunker
+from pipeline.embeddings.sentence_transformer_embed import embed_chunks
+from pipeline.vector_store.faiss_store import FaissStore
+from pipeline.rag.retrieval_engine import answer_question
+
+FAISS_INDEX_PATH = "data/faiss.index"
+EMBED_DIM = 384
+
+def sanitize_filename(filename):
+    return re.sub(r'[^a-zA-Z0-9_.-]', '_', filename)
+
+def process_and_qa(file, question):
+    try:
+        save_dir = Path("data/raw/")
+        save_dir.mkdir(parents=True, exist_ok=True)
+        filename = sanitize_filename(getattr(file, "name", "uploaded_file"))
+        file_path = save_dir / Path(filename).name
+
+        content = None
+        if hasattr(file, "read"):
+            content = file.read()
+        elif hasattr(file, "data"):
+            content = file.data
+        elif isinstance(file, bytes):
+            content = file
+        elif isinstance(file, str) and os.path.exists(file):
+            content = None
+            file_path = file
+        else:
+            return "Invalid file object format!", "Error", "Error"
+
+        if content:
+            with open(file_path, "wb") as f:
+                f.write(content)
+
+        ext = Path(filename).suffix.lower()
+        if ext == ".pdf":
+            parser = PDFParser()
+        elif ext == ".docx":
+            parser = DOCXParser()
+        elif ext == ".txt":
+            parser = TXTParser()
+        elif ext in [".html", ".htm"]:
+            parser = HTMLParser()
+        else:
+            return "Unsupported filetype.", "", ""
+
+        
+        try:
+            text, metadata = parser.extract_text_and_metadata(str(file_path))
+            chunks = FixedChunker().chunk(text, chunk_size=512, overlap=64)
+            #print(f"Chunks parsed: {len(chunks)}")
+            embeddings = embed_chunks(chunks, model_name="all-MiniLM-L6-v2")
+            #print(f"Embeddings computed: {len(embeddings)}")
+            metadatas = [{} for _ in chunks]
+            store = FaissStore(dim=EMBED_DIM, index_path=FAISS_INDEX_PATH)
+            if os.path.exists(FAISS_INDEX_PATH):
+                store.load()
+            store.add_documents(chunks, embeddings, metadatas)
+            store.save()
+            #print("Index updated.")
+        except Exception as e:
+            return f"Failed to extract: {repr(e)}", "", ""
+
+        qa_result = answer_question(
+            question=question,
+            embed_model="all-MiniLM-L6-v2",
+            store_type="faiss",
+            store_kwargs={"dim": EMBED_DIM, "index_path": FAISS_INDEX_PATH},
+            llm_name="TinyLlama/TinyLlama-1.1B-Chat-v1.0",
+            top_k=5,
+        )
+        answer = qa_result["answer"]
+        matched_chunks = qa_result.get("chunks", [])
+        #print("QA chunks:", matched_chunks)
+        context = "\n\n---\n\n".join([c["text"] for c in matched_chunks]) if matched_chunks else "No supporting context found."
+        return f"Preview (first 500 chars):\n{text[:500]}", answer, context
+
+    except Exception as e:
+        # print("GRADIO ERROR:", str(e))
+        return f"Error: {e}", "Error", "Error"
+
+iface = gr.Interface(
+    fn=process_and_qa,
+    inputs=[
+        gr.File(label="Upload PDF, DOCX, TXT, or HTML"),
+        gr.Textbox(label="Question"),
+    ],
+    outputs=[
+        gr.Textbox(label="Extracted/Text Preview", lines=10, show_copy_button=True),
+        gr.Textbox(label="Answer", lines=6, show_copy_button=True),
+        gr.Textbox(label="Matched Context", lines=12, show_copy_button=True)
+    ],
+    title="Book/Document QA",
+    description="Upload your document, ask a question, and see the answer with cited context!"
+)
+
+if __name__ == "__main__":
+    iface.launch(server_name="0.0.0.0", server_port=7860)