Upload app.py

app.py

@@ -43,9 +43,19 @@ def _counts_str(counts):
 
 
 def _write_tmp(filename: str, content: str) -> str:
-    p = pathlib.Path(tempfile.gettempdir()) / filename
-    p.write_text(content, encoding="utf-8")
-    return str(p)
+    base = pathlib.Path(filename).name
+    stem = pathlib.Path(base).stem or "quread"
+    suffix = pathlib.Path(base).suffix or ".txt"
+    with tempfile.NamedTemporaryFile(
+        mode="w",
+        encoding="utf-8",
+        prefix=f"{stem}_",
+        suffix=suffix,
+        dir=tempfile.gettempdir(),
+        delete=False,
+    ) as f:
+        f.write(content)
+        return f.name
 
 
 def _circuit_hash(history):
@@ -114,27 +124,41 @@ def measure_collapse(qc, shots):
     return last_counts, f"✅ Collapsed to |{res}⟩ and sampled shots."
 
 
-def explain_llm(qc, n_qubits, shots, last_hash):
+def explain_llm(qc, n_qubits, shots, last_hash, previous_explanation):
     # circuit-change gating
     curr_hash = _circuit_hash(qc.history)
     if curr_hash == last_hash:
-        return "ℹ️ Circuit unchanged. Explanation reused.", last_hash, ""
+        if previous_explanation:
+            shown = f"ℹ️ Circuit unchanged. Reusing previous explanation.\n\n{previous_explanation}"
+            return shown, last_hash, previous_explanation
+        return "ℹ️ Circuit unchanged. No previous explanation available.", last_hash, previous_explanation
 
     # cost guard
     EST_TOKENS = 900
     if not allow_request(EST_TOKENS):
-        return "🚫 Explanation disabled (daily token limit reached).", last_hash, ""
+        if previous_explanation:
+            shown = "🚫 Explanation disabled (daily token limit reached). Showing previous explanation.\n\n"
+            shown += previous_explanation
+            return shown, last_hash, previous_explanation
+        return "🚫 Explanation disabled (daily token limit reached).", last_hash, previous_explanation
 
     state_ket = qc.ket_notation(max_terms=6)
     probs_top = _probs_top(qc, int(n_qubits), k=6)
 
-    explanation = explain_with_gpt4o(
-        n_qubits=int(n_qubits),
-        history=qc.history,
-        state_ket=state_ket,
-        probs_top=probs_top,
-        shots=int(shots),
-    )
+    try:
+        explanation = explain_with_gpt4o(
+            n_qubits=int(n_qubits),
+            history=qc.history,
+            state_ket=state_ket,
+            probs_top=probs_top,
+            shots=int(shots),
+        )
+    except Exception as exc:
+        safe_msg = f"❌ Explanation request failed: {exc}"
+        if previous_explanation:
+            shown = f"{safe_msg}\n\nShowing previous explanation:\n\n{previous_explanation}"
+            return shown, last_hash, previous_explanation
+        return safe_msg, last_hash, previous_explanation
 
     return explanation, curr_hash, explanation
 
@@ -148,6 +172,13 @@ def _refresh_choices(n):
     )
 
 
+def _on_qubit_count_change(n):
+    qc, last_counts, selected_gate = _new_sim(n)
+    t, c, ct = _refresh_choices(n)
+    msg = f"✅ Reinitialized simulator with {int(n)} qubits."
+    return qc, last_counts, selected_gate, t, c, ct, msg
+
+
 # ---------- Styling ----------
 CSS = """
 #title h1 { font-size: 42px !important; margin-bottom: 6px; }
@@ -298,9 +329,9 @@ with gr.Blocks(theme=theme, css=CSS, title="Quread.ai — State Vector Studio")
     )
 
     n_qubits.change(
-        fn=_refresh_choices,
+        fn=_on_qubit_count_change,
         inputs=[n_qubits],
-        outputs=[target, control, cnot_target],
+        outputs=[qc_state, last_counts_state, selected_gate_state, target, control, cnot_target, status],
     ).then(
         fn=update_views,
         inputs=[qc_state, last_counts_state, n_qubits],
@@ -390,7 +421,7 @@ with gr.Blocks(theme=theme, css=CSS, title="Quread.ai — State Vector Studio")
 
     explain_btn.click(
         fn=explain_llm,
-        inputs=[qc_state, n_qubits, shots, last_explained_hash],
+        inputs=[qc_state, n_qubits, shots, last_explained_hash, explanation_md],
         outputs=[llm_out, last_explained_hash, explanation_md],
     )
     
@@ -409,13 +440,18 @@ with gr.Blocks(theme=theme, css=CSS, title="Quread.ai — State Vector Studio")
         return _write_tmp("explanation.md", md_text)
 
     def dl_explain_pdf(md_text):
-        path = pathlib.Path(tempfile.gettempdir()) / "explanation.pdf"
-        md_to_pdf(md_text, str(path))
-        return str(path)
+        fd, path = tempfile.mkstemp(
+            prefix="explanation_",
+            suffix=".pdf",
+            dir=tempfile.gettempdir(),
+        )
+        os.close(fd)
+        md_to_pdf(md_text, path)
+        return path
 
     dl_md.click(fn=dl_explain_md, inputs=[explanation_md], outputs=[dl_md])
     dl_pdf.click(fn=dl_explain_pdf, inputs=[explanation_md], outputs=[dl_pdf])
 
 
 if __name__ == "__main__":
-    demo.launch(server_name="0.0.0.0", server_port=7860)
+    demo.launch(server_name="0.0.0.0", server_port=7860)