# This code is part of Qiskit.
#
# (C) Copyright IBM 2019.
#
# This code is licensed under the Apache License, Version 2.0. You may
# obtain a copy of this license in the LICENSE.txt file in the root directory
# of this source tree or at http://www.apache.org/licenses/LICENSE-2.0.
#
# Any modifications or derivative works of this code must retain this
# copyright notice, and modified files need to carry a notice indicating
# that they have been altered from the originals.


"""Test the PulseDefaults part of the backend."""
import copy
import warnings

import numpy as np

from qiskit.test import QiskitTestCase
from qiskit.test.mock import FakeOpenPulse2Q


class TestPulseDefaults(QiskitTestCase):
    """Test the PulseDefaults creation and method usage."""

    def setUp(self):
        super().setUp()
        self.defs = FakeOpenPulse2Q().defaults()
        self.inst_map = self.defs.instruction_schedule_map

    def test_buffer(self):
        """Test getting the buffer value."""
        self.assertEqual(self.defs.buffer, 10)

    def test_freq_est(self):
        """Test extracting qubit frequencies."""
        warnings.simplefilter("ignore")
        self.assertEqual(self.defs.qubit_freq_est[1], 5.0 * 1e9)
        self.assertEqual(self.defs.meas_freq_est[0], 6.5 * 1e9)
        warnings.simplefilter("default")

    def test_default_building(self):
        """Test building of ops definition is properly built from backend."""
        self.assertTrue(self.inst_map.has("u1", (0,)))
        self.assertTrue(self.inst_map.has("u3", (0,)))
        self.assertTrue(self.inst_map.has("u3", 1))
        self.assertTrue(self.inst_map.has("cx", (0, 1)))
        self.assertEqual(self.inst_map.get_parameters("u1", 0), ("P0",))
        u1_minus_pi = self.inst_map.get("u1", 0, P0=np.pi)
        fc_cmd = u1_minus_pi.instructions[0][-1]
        self.assertAlmostEqual(fc_cmd.phase, -np.pi)

    def test_str(self):
        """Test that __str__ method works."""
        self.assertEqual(
            "<PulseDefaults(<InstructionScheduleMap(1Q instructions:\n  q0:", str(self.defs)[:61]
        )
        self.assertTrue("Multi qubit instructions:\n  (0, 1): " in str(self.defs)[70:])
        self.assertTrue(
            "Qubit Frequencies [GHz]\n[4.9, 5.0]\nMeasurement Frequencies [GHz]\n[6.5, "
            "6.6] )>" in str(self.defs)[100:]
        )

    def test_deepcopy(self):
        """Test that deepcopy creates an identical object."""
        copy_defs = copy.deepcopy(self.defs)
        self.assertEqual(list(copy_defs.to_dict().keys()), list(self.defs.to_dict().keys()))
