{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "7bd45290",
   "metadata": {},
   "source": [
    "# 19 - Qiskit Interoperability\n",
    "\n",
    "Convert circuits between QuantSDK and Qiskit.\n",
    "\n",
    "**Concepts:** Interop, to_qiskit, from_qiskit"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "ac9e2491",
   "metadata": {},
   "outputs": [],
   "source": [
    "import quantsdk as qs"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "0991a8f8",
   "metadata": {},
   "source": [
    "## QuantSDK -> Qiskit"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "40943db6",
   "metadata": {},
   "outputs": [],
   "source": [
    "# Build a circuit in QuantSDK\n",
    "circuit = qs.Circuit(2, name=\"bell\")\n",
    "circuit.h(0).cx(0, 1).measure_all()\n",
    "\n",
    "print(\"QuantSDK circuit:\")\n",
    "print(f\"  Qubits: {circuit.num_qubits}\")\n",
    "print(f\"  Gates: {circuit.gate_count}\")\n",
    "print(f\"  Depth: {circuit.depth}\")\n",
    "print(f\"  Ops: {circuit.count_ops()}\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "b605c834",
   "metadata": {},
   "outputs": [],
   "source": [
    "# Convert to Qiskit\n",
    "try:\n",
    "    qc = circuit.to_qiskit()\n",
    "    print(\"Qiskit circuit:\")\n",
    "    print(f\"  Type: {type(qc).__name__}\")\n",
    "    print(f\"  Qubits: {qc.num_qubits}\")\n",
    "    print(f\"  Depth: {qc.depth()}\")\n",
    "    print(qc.draw())\n",
    "except ImportError:\n",
    "    print(\"Qiskit not installed, showing API usage only\")\n",
    "    print(\"  circuit.to_qiskit() -> qiskit.QuantumCircuit\")"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "03942a8c",
   "metadata": {},
   "source": [
    "## Qiskit -> QuantSDK"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "6146511e",
   "metadata": {},
   "outputs": [],
   "source": [
    "try:\n",
    "    from qiskit import QuantumCircuit\n",
    "    \n",
    "    # Build in Qiskit\n",
    "    qc = QuantumCircuit(3)\n",
    "    qc.h(0)\n",
    "    qc.cx(0, 1)\n",
    "    qc.cx(1, 2)\n",
    "    qc.measure_all()\n",
    "    \n",
    "    # Convert to QuantSDK\n",
    "    qs_circuit = qs.Circuit.from_qiskit(qc)\n",
    "    \n",
    "    print(f\"Converted circuit: {qs_circuit.num_qubits} qubits, {qs_circuit.gate_count} gates\")\n",
    "    \n",
    "    # Run on QuantSDK\n",
    "    result = qs.run(qs_circuit, shots=1000, seed=42)\n",
    "    print(f\"Result: {result.counts}\")\n",
    "    print(f\"Most likely: {result.most_likely}\")\n",
    "except ImportError:\n",
    "    print(\"Qiskit not installed. API:\")\n",
    "    print(\"  qs.Circuit.from_qiskit(qiskit_circuit) -> qs.Circuit\")"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "04d8cd77",
   "metadata": {},
   "source": [
    "## Round-Trip Validation"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "ebb1ba62",
   "metadata": {},
   "outputs": [],
   "source": [
    "# Build complex circuit\n",
    "original = qs.Circuit(3, name=\"complex\")\n",
    "original.h(0).cx(0, 1).ry(2, 1.23).cz(1, 2).rx(0, 0.45).measure_all()\n",
    "\n",
    "# Run original\n",
    "r1 = qs.run(original, shots=2000, seed=42)\n",
    "\n",
    "try:\n",
    "    # Round-trip: QuantSDK -> Qiskit -> QuantSDK\n",
    "    qc = original.to_qiskit()\n",
    "    roundtrip = qs.Circuit.from_qiskit(qc)\n",
    "    \n",
    "    r2 = qs.run(roundtrip, shots=2000, seed=42)\n",
    "    \n",
    "    print(\"Round-trip fidelity check:\")\n",
    "    print(f\"  Original gates: {original.gate_count}\")\n",
    "    print(f\"  Roundtrip gates: {roundtrip.gate_count}\")\n",
    "    print(f\"  Original top: {r1.most_likely}\")\n",
    "    print(f\"  Roundtrip top: {r2.most_likely}\")\n",
    "    print(f\"  Match: {r1.most_likely == r2.most_likely}\")\n",
    "except ImportError:\n",
    "    print(f\"Original result: {r1.most_likely}\")\n",
    "    print(\"Round-trip requires Qiskit installed.\")"
   ]
  }
 ],
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