# Copyright 2021 The PECOS Developers
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
# the License.You may obtain a copy of the License at
#
#     https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
# specific language governing permissions and limitations under the License.

from __future__ import annotations

from typing import TYPE_CHECKING

import numpy as np

if TYPE_CHECKING:
    from pecos import QuantumCircuit


def noise_tq_mem(locations: set[tuple[int, int]], after: QuantumCircuit, p: float) -> None:
    """The memory noise model for idling qubits.

    Args:
    ----
        locations: Set of qubits the ideal gates act on.
        after: QuantumCircuit collecting the noise that occurs after the ideal gates.
    """
    err_qubits = set()
    for locs in locations:
        rand_nums = np.random.random(len(locs)) <= p

        for r, loc in zip(rand_nums, locs):
            if r:
                err_qubits.add(loc)

    if err_qubits:
        after.append("Z", err_qubits)
