# This file is part of the Trezor project.
#
# Copyright (C) 2012-2019 SatoshiLabs and contributors
#
# This library is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License version 3
# as published by the Free Software Foundation.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the License along with this library.
# If not, see <https://www.gnu.org/licenses/lgpl-3.0.html>.

import time

import pytest

from trezorlib import btc, device
from trezorlib.debuglink import SessionDebugWrapper as Session
from trezorlib.messages import SafetyCheckLevel
from trezorlib.tools import H_

pytestmark = [
    pytest.mark.models("legacy"),
    pytest.mark.flaky(max_runs=5),
]


def test_public_ckd(session: Session):
    # disable safety checks to access non-standard paths
    device.apply_settings(session, safety_checks=SafetyCheckLevel.PromptTemporarily)
    btc.get_address(session, "Bitcoin", [])  # to compute root node via BIP39

    for depth in range(8):
        start = time.time()
        btc.get_address(session, "Bitcoin", range(depth))
        delay = time.time() - start
        expected = (depth + 1) * 0.26
        print("DEPTH", depth, "EXPECTED DELAY", expected, "REAL DELAY", delay)
        assert delay <= expected


def test_private_ckd(session: Session):
    # disable safety checks to access non-standard paths
    device.apply_settings(session, safety_checks=SafetyCheckLevel.PromptTemporarily)
    btc.get_address(session, "Bitcoin", [])  # to compute root node via BIP39

    for depth in range(8):
        start = time.time()
        address_n = [H_(-i) for i in range(-depth, 0)]
        btc.get_address(session, "Bitcoin", address_n)
        delay = time.time() - start
        expected = (depth + 1) * 0.26
        print("DEPTH", depth, "EXPECTED DELAY", expected, "REAL DELAY", delay)
        assert delay <= expected


def test_cache(session: Session):
    # disable safety checks to access non-standard paths
    device.apply_settings(session, safety_checks=SafetyCheckLevel.PromptTemporarily)

    start = time.time()
    for x in range(10):
        btc.get_address(session, "Bitcoin", [x, 2, 3, 4, 5, 6, 7, 8])
    nocache_time = time.time() - start

    start = time.time()
    for x in range(10):
        btc.get_address(session, "Bitcoin", [1, 2, 3, 4, 5, 6, 7, x])
    cache_time = time.time() - start

    print("NOCACHE TIME", nocache_time)
    print("CACHED TIME", cache_time)

    # Cached time expected to be at least 2x faster
    assert cache_time <= nocache_time / 2.0