Create app.py

app.py

@@ -0,0 +1,92 @@
+import streamlit as st
+from google import genai
+
+# Page Config
+st.set_page_config(page_title="Gemini API Tester", page_icon="⚡")
+
+# --- Title ---
+st.title("⚡ Gemini API Tester")
+st.markdown("Enter your Google API key to see which Gemini models are available.")
+
+# --- Sidebar ---
+with st.sidebar:
+    st.header("🔐 API Configuration")
+
+    api_key = st.text_input(
+        "Enter your Google API Key",
+        type="password"
+    )
+
+    models = []
+    client = None
+
+    if api_key:
+        try:
+            # Initialize client
+            client = genai.Client(api_key=api_key)
+
+            # Fetch available models
+            models = [
+                model.name
+                for model in client.models.list()
+                if "gemini" in model.name.lower()
+            ]
+
+            if models:
+                st.success("✅ API Key is valid")
+            else:
+                st.warning("⚠️ API key is valid, but no Gemini models found")
+
+        except Exception as e:
+            st.error("❌ Invalid API Key")
+            st.caption(str(e))
+
+    # Model selection (only show if models exist)
+    selected_model = None
+    if models:
+        selected_model = st.selectbox(
+            "Available Models",
+            models
+        )
+
+# --- Chat State ---
+if "messages" not in st.session_state:
+    st.session_state.messages = []
+
+# Display chat history
+for msg in st.session_state.messages:
+    with st.chat_message(msg["role"]):
+        st.markdown(msg["content"])
+
+# --- Chat Input ---
+if prompt := st.chat_input("Ask something..."):
+
+    if not client or not selected_model:
+        st.error("❌ Please enter a valid API key and select a model first.")
+        st.stop()
+
+    # User message
+    st.session_state.messages.append({"role": "user", "content": prompt})
+    with st.chat_message("user"):
+        st.markdown(prompt)
+
+    # Assistant response
+    with st.chat_message("assistant"):
+        placeholder = st.empty()
+        placeholder.markdown("Thinking...")
+
+        try:
+            response = client.models.generate_content(
+                model=selected_model,
+                contents=prompt
+            )
+
+            reply = response.text
+            placeholder.markdown(reply)
+
+            st.session_state.messages.append(
+                {"role": "assistant", "content": reply}
+            )
+
+        except Exception as e:
+            placeholder.error(f"❌ Error: {e}")