# Copyright (c) 2009-2021 Arm Limited
# SPDX-License-Identifier: Apache-2.0
#
# 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
#
# http://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.

import logging
from time import sleep
from typing import Any, List, Mapping, Optional

import mbed_lstools
import pytest

from .device import Device
from .serial_connection import SerialConnection
from .serial_device import SerialDevice

log = logging.getLogger(__name__)


@pytest.fixture(scope="session")
def platforms(request):
    if request.config.getoption('platforms'):
        return request.config.getoption('platforms').split(',')
    else:
        return [
            'CY8CPROTO_062_4343W'
        ]


@pytest.fixture(scope="session")
def serial_inter_byte_delay(request):
    if request.config.getoption('serial_inter_byte_delay'):
        return float(request.config.getoption('serial_inter_byte_delay'))
    return None


@pytest.fixture(scope="session")
def serial_baudrate(request):
    if request.config.getoption('serial_baudrate'):
        return int(request.config.getoption('serial_baudrate'))
    return 115200


@pytest.fixture(scope="session")
def network(request):
    if request.config.getoption('network'):
        credentials = request.config.getoption('network')
        params = credentials.split(':')
        return (params[0], params[1])
    return None


class BoardAllocation:
    def __init__(self, description: Mapping[str, Any]):
        self.description = description
        self.device = None


class BoardAllocator:
    def __init__(self, platforms_supported: List[str], serial_inter_byte_delay: float, baudrate: int):
        mbed_ls = mbed_lstools.create(list_unmounted=True)
        boards = mbed_ls.list_mbeds(
            filter_function=lambda m: m['platform_name'] in platforms_supported)
        self.board_description = boards
        self.allocation = []
        self.serial_inter_byte_delay = serial_inter_byte_delay
        self.baudrate = baudrate
        for desc in boards:
            self.allocation.append(BoardAllocation(desc))

    def allocate(self, name: str = None):
        for alloc in self.allocation:
            if alloc.device is None:
                platform = alloc.description['platform_name']
                log.info('Start {} board allocation'.format(platform))

                # Create the serial connection
                connection = SerialConnection(
                    port=alloc.description["serial_port"],
                    baudrate=self.baudrate,
                    inter_byte_delay=self.serial_inter_byte_delay
                )
                connection.open()

                # Create the serial device
                alloc.device = SerialDevice(connection, name)
                alloc.device.start()
                alloc.device.reset(duration=1)
                alloc.device.flush(1)

                sleep(2)

                log.info('Allocate {} board as serial device'.format(platform))

                return alloc.device
        return None

    def release(self, device: Device) -> None:
        for alloc in self.allocation:
            if alloc.device == device and alloc.device is not None:

                # Stop activities
                alloc.device.stop()
                alloc.device.serial.close()

                # Cleanup
                alloc.device = None

                log.info('Release {} board'.format(
                    alloc.description['platform_name']))


@pytest.fixture(scope="session")
def board_allocator(
        platforms: List[str],
        serial_inter_byte_delay: float,
        serial_baudrate: int,
):
    yield BoardAllocator(platforms, serial_inter_byte_delay, serial_baudrate)


@pytest.fixture(scope="function")
def device(board_allocator):
    device = board_allocator.allocate(name='DUT')
    yield device
    board_allocator.release(device)