Create app.py

app.py

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+import streamlit as st
+import requests
+import json
+import os
+
+# Configure the page
+st.set_page_config(page_title="NanoCoder AI", page_icon="💻", layout="wide")
+
+# Retrieve OpenRouter API Key from Hugging Face Secrets
+OPENROUTER_API_KEY = os.environ.get("OPENROUTER_API_KEY", "")
+
+st.title("💻 NanoCoder Web App")
+st.caption("Powered by Hugging Face Spaces & OpenRouter Free Models")
+
+# Sidebar for settings
+st.sidebar.header("Configuration")
+model_option = st.sidebar.selectbox(
+    "Choose Free Coding Model:",
+    [
+        "nvidia/nemotron-3-super-120b-a12b:free",
+        "poolside/laguna-m.1:free",
+        "minimax/minimax-m2.5:free",
+        "openai/gpt-oss-120b:free"
+    ]
+)
+
+system_prompt = st.sidebar.text_area(
+    "System Prompt", 
+    "You are NanoCoder, a hyper-efficient, concise coding assistant. Provide clean, production-ready code blocks without unnecessary fluff."
+)
+
+# Initialize chat history
+if "messages" not in st.session_state:
+    st.session_state.messages = []
+
+# Display chat history
+for message in st.session_state.messages:
+    with st.chat_message(message["role"]):
+        st.markdown(message["content"])
+
+# Accept user input
+if prompt := st.chat_input("What do you want to code today?"):
+    # Check if API key is present
+    if not OPENROUTER_API_KEY:
+        st.error("Missing OpenRouter API Key! Please set it up in your Space settings.")
+        st.stop()
+
+    # Append user message
+    st.session_state.messages.append({"role": "user", "content": prompt})
+    with st.chat_message("user"):
+        st.markdown(prompt)
+
+    # Call OpenRouter API
+    with st.chat_message("assistant"):
+        response_placeholder = st.empty()
+        response_placeholder.markdown("*Thinking...*")
+        
+        headers = {
+            "Authorization": f"Bearer {OPENROUTER_API_KEY}",
+            "HTTP-Referer": "https://huggingface.co/spaces", # Required by OpenRouter
+            "Content-Type": "application/json"
+        }
+        
+        # Format the context payload
+        api_messages = [{"role": "system", "content": system_prompt}] + [
+            {"role": m["role"], "content": m["content"]} for m in st.session_state.messages
+        ]
+        
+        payload = {
+            "model": model_option,
+            "messages": api_messages
+        }
+
+        try:
+            res = requests.post(
+                "https://openrouter.ai/api/v1/chat/completions",
+                headers=headers,
+                data=json.dumps(payload),
+                timeout=30
+            )
+            
+            if res.status_code == 200:
+                response_json = res.json()
+                assistant_response = response_json['choices'][0]['message']['content']
+                response_placeholder.markdown(assistant_response)
+                # Save assistant response to history
+                st.session_state.messages.append({"role": "assistant", "content": assistant_response})
+            else:
+                response_placeholder.markdown(f"⚠️ Error: {res.status_code} - {res.text}")
+                
+        except Exception as e:
+            response_placeholder.markdown(f"⚠️ Failed to connect to OpenRouter: {str(e)}")