#!/usr/bin/env python3

# Copyright 2020 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Runs unit tests on device and displays the results.

This script assumes you have a ~/.servodrc config file with a line that
corresponds to the board being tested.

See https://chromium.googlesource.com/chromiumos/third_party/hdctools/+/HEAD/docs/servo.md#servodrc
"""
import argparse
import concurrent
import io
import logging
import os
import re
import subprocess
import sys
import time
from concurrent.futures.thread import ThreadPoolExecutor
from enum import Enum
from pathlib import Path
from typing import Optional, BinaryIO, List

import colorama  # type: ignore[import]

EC_DIR = Path(os.path.dirname(os.path.realpath(__file__))).parent
FLASH_SCRIPT = os.path.join(EC_DIR, 'util/flash_jlink.py')

ALL_TESTS_PASSED_REGEX = re.compile(r'Pass!\r\n')
ALL_TESTS_FAILED_REGEX = re.compile(r'Fail! \(\d+ tests\)\r\n')

SINGLE_CHECK_PASSED_REGEX = re.compile(r'Pass: .*')
SINGLE_CHECK_FAILED_REGEX = re.compile(r'.*failed:.*')

ASSERTION_FAILURE_REGEX = re.compile(r'ASSERTION FAILURE.*')

DATA_ACCESS_VIOLATION_8020000_REGEX = re.compile(
    r'Data access violation, mfar = 8020000\r\n')
DATA_ACCESS_VIOLATION_8040000_REGEX = re.compile(
    r'Data access violation, mfar = 8040000\r\n')
DATA_ACCESS_VIOLATION_80C0000_REGEX = re.compile(
    r'Data access violation, mfar = 80c0000\r\n')
DATA_ACCESS_VIOLATION_80E0000_REGEX = re.compile(
    r'Data access violation, mfar = 80e0000\r\n')
DATA_ACCESS_VIOLATION_20000000_REGEX = re.compile(
    r'Data access violation, mfar = 20000000\r\n')

BLOONCHIPPER = 'bloonchipper'
DARTMONKEY = 'dartmonkey'


class ImageType(Enum):
    """EC Image type to use for the test."""
    RO = 1
    RW = 2


class BoardConfig:
    """Board-specific configuration."""

    def __init__(self, name, servo_uart_name, servo_power_enable,
                 rollback_region0_regex, rollback_region1_regex):
        self.name = name
        self.servo_uart_name = servo_uart_name
        self.servo_power_enable = servo_power_enable
        self.rollback_region0_regex = rollback_region0_regex
        self.rollback_region1_regex = rollback_region1_regex


class TestConfig:
    """Configuration for a given test."""

    def __init__(self, name, image_to_use=ImageType.RW, finish_regexes=None,
                 toggle_power=False, test_args=None, num_flash_attempts=2,
                 timeout_secs=10, enable_hw_write_protect=False):
        if test_args is None:
            test_args = []
        if finish_regexes is None:
            finish_regexes = [ALL_TESTS_PASSED_REGEX, ALL_TESTS_FAILED_REGEX]

        self.name = name
        self.image_to_use = image_to_use
        self.finish_regexes = finish_regexes
        self.test_args = test_args
        self.toggle_power = toggle_power
        self.num_flash_attempts = num_flash_attempts
        self.timeout_secs = timeout_secs
        self.enable_hw_write_protect = enable_hw_write_protect
        self.logs = []
        self.passed = False
        self.num_fails = 0
        self.num_passes = 0


# All possible tests.
class AllTests:
    """All possible tests."""

    @staticmethod
    def get(board_config: BoardConfig):
        tests = {
            'aes':
                TestConfig(name='aes'),
            'crc':
                TestConfig(name='crc'),
            'flash_physical':
                TestConfig(name='flash_physical', image_to_use=ImageType.RO,
                           toggle_power=True),
            'flash_write_protect':
                TestConfig(name='flash_write_protect',
                           image_to_use=ImageType.RO,
                           toggle_power=True, enable_hw_write_protect=True),
            'fpsensor_spi_ro':
                TestConfig(name='fpsensor', image_to_use=ImageType.RO,
                           test_args=['spi']),
            'fpsensor_spi_rw':
                TestConfig(name='fpsensor', test_args=['spi']),
            'fpsensor_uart_ro':
                TestConfig(name='fpsensor', image_to_use=ImageType.RO,
                           test_args=['uart']),
            'fpsensor_uart_rw':
                TestConfig(name='fpsensor', test_args=['uart']),
            'mpu_ro':
                TestConfig(name='mpu',
                           image_to_use=ImageType.RO,
                           finish_regexes=[
                               DATA_ACCESS_VIOLATION_20000000_REGEX]),
            'mpu_rw':
                TestConfig(name='mpu',
                           finish_regexes=[
                               DATA_ACCESS_VIOLATION_20000000_REGEX]),
            'mutex':
                TestConfig(name='mutex'),
            'pingpong':
                TestConfig(name='pingpong'),
            'rollback_region0':
                TestConfig(name='rollback', finish_regexes=[
                    board_config.rollback_region0_regex],
                           test_args=['region0']),
            'rollback_region1':
                TestConfig(name='rollback', finish_regexes=[
                    board_config.rollback_region1_regex],
                           test_args=['region1']),
            'rollback_entropy':
                TestConfig(name='rollback_entropy', image_to_use=ImageType.RO),
            'rtc':
                TestConfig(name='rtc'),
            'sha256':
                TestConfig(name='sha256'),
            'sha256_unrolled':
                TestConfig(name='sha256_unrolled'),
            'utils':
                TestConfig(name='utils', timeout_secs=20),
        }

        if board_config.name == BLOONCHIPPER:
            tests['stm32f_rtc'] = TestConfig(name='stm32f_rtc')

        return tests


BLOONCHIPPER_CONFIG = BoardConfig(
    name=BLOONCHIPPER,
    servo_uart_name='raw_fpmcu_uart_pty',
    servo_power_enable='spi1_vref',
    rollback_region0_regex=DATA_ACCESS_VIOLATION_8020000_REGEX,
    rollback_region1_regex=DATA_ACCESS_VIOLATION_8040000_REGEX,
)

DARTMONKEY_CONFIG = BoardConfig(
    name=DARTMONKEY,
    servo_uart_name='raw_fpmcu_uart_pty',
    servo_power_enable='spi1_vref',
    rollback_region0_regex=DATA_ACCESS_VIOLATION_80C0000_REGEX,
    rollback_region1_regex=DATA_ACCESS_VIOLATION_80E0000_REGEX,
)

BOARD_CONFIGS = {
    'bloonchipper': BLOONCHIPPER_CONFIG,
    'dartmonkey': DARTMONKEY_CONFIG,
}


def get_console(board_name: str, board_config: BoardConfig) -> Optional[str]:
    """Get the name of the console for a given board."""
    cmd = [
        'dut-control',
        '-n', board_name,
        board_config.servo_uart_name,
    ]
    logging.debug('Running command: "%s"', ' '.join(cmd))

    with subprocess.Popen(cmd, stdout=subprocess.PIPE) as proc:
        for line in io.TextIOWrapper(proc.stdout):  # type: ignore[arg-type]
            logging.debug(line)
            pty = line.split(':')
            if len(pty) == 2 and pty[0] == board_config.servo_uart_name:
                return pty[1].strip()

    return None


def power(board_name: str, board_config: BoardConfig, on: bool) -> None:
    """Turn power to board on/off."""
    if on:
        state = 'pp3300'
    else:
        state = 'off'

    cmd = [
        'dut-control',
        '-n', board_name,
        board_config.servo_power_enable + ':' + state,
    ]
    logging.debug('Running command: "%s"', ' '.join(cmd))
    subprocess.run(cmd).check_returncode()


def hw_write_protect(board_name: str, enable: bool) -> None:
    """Enable/disable hardware write protect."""
    if enable:
        state = 'on'
    else:
        state = 'off'

    cmd = [
        'dut-control',
        '-n', board_name,
        'fw_wp_en' + ':' + state,
        ]
    logging.debug('Running command: "%s"', ' '.join(cmd))
    subprocess.run(cmd).check_returncode()


def build(test_name: str, board_name: str) -> None:
    """Build specified test for specified board."""
    cmd = [
        'make',
        'BOARD=' + board_name,
        'test-' + test_name,
        '-j',
    ]

    logging.debug('Running command: "%s"', ' '.join(cmd))
    subprocess.run(cmd).check_returncode()


def flash(test_name: str, board: str) -> bool:
    """Flash specified test to specified board."""
    logging.info("Flashing test")

    # TODO(b/151105339): Support ./util/flash_ec as well. It's slower, but only
    # requires servo micro.
    cmd = [
        FLASH_SCRIPT,
        '--board', board,
        '--image', os.path.join(EC_DIR, 'build', board, test_name,
                                test_name + '.bin'),
    ]
    logging.debug('Running command: "%s"', ' '.join(cmd))
    completed_process = subprocess.run(cmd)
    return completed_process.returncode == 0


def readline(executor: ThreadPoolExecutor, f: BinaryIO, timeout_secs: int) -> \
             Optional[bytes]:
    """Read a line with timeout."""
    a = executor.submit(f.readline)
    try:
        return a.result(timeout_secs)
    except concurrent.futures.TimeoutError:
        return None


def readlines_until_timeout(executor, f: BinaryIO, timeout_secs: int) -> \
                            List[bytes]:
    """Continuously read lines for timeout_secs."""
    lines: List[bytes] = []
    while True:
        line = readline(executor, f, timeout_secs)
        if not line:
            return lines
        lines.append(line)


def process_console_output_line(line: bytes, test: TestConfig):
    try:
        line_str = line.decode()

        if SINGLE_CHECK_PASSED_REGEX.match(line_str):
            test.num_passes += 1

        if SINGLE_CHECK_FAILED_REGEX.match(line_str):
            test.num_fails += 1

        if ALL_TESTS_FAILED_REGEX.match(line_str):
            test.num_fails += 1

        if ASSERTION_FAILURE_REGEX.match(line_str):
            test.num_fails += 1

        return line_str
    except UnicodeDecodeError:
        # Sometimes we get non-unicode from the console (e.g., when the
        # board reboots.) Not much we can do in this case, so we'll just
        # ignore it.
        return None


def run_test(test: TestConfig, console: str, executor: ThreadPoolExecutor) ->\
             bool:
    """Run specified test."""
    start = time.time()
    with open(console, "wb+", buffering=0) as c:
        # Wait for boot to finish
        time.sleep(1)
        c.write('\n'.encode())
        if test.image_to_use == ImageType.RO:
            c.write('reboot ro\n'.encode())
            time.sleep(1)

        test_cmd = 'runtest ' + ' '.join(test.test_args) + '\n'
        c.write(test_cmd.encode())

        while True:
            c.flush()
            line = readline(executor, c, 1)
            if not line:
                now = time.time()
                if now - start > test.timeout_secs:
                    logging.debug("Test timed out")
                    return False
                continue

            logging.debug(line)
            test.logs.append(line)
            # Look for test_print_result() output (success or failure)
            line_str = process_console_output_line(line, test)
            if line_str is None:
                # Sometimes we get non-unicode from the console (e.g., when the
                # board reboots.) Not much we can do in this case, so we'll just
                # ignore it.
                continue

            for r in test.finish_regexes:
                if r.match(line_str):
                    # flush read the remaining
                    lines = readlines_until_timeout(executor, c, 1)
                    logging.debug(lines)
                    test.logs.append(lines)

                    for line in lines:
                        process_console_output_line(line, test)

                    return test.num_fails == 0


def get_test_list(config: BoardConfig, test_args) -> List[TestConfig]:
    """Get a list of tests to run."""
    if test_args == 'all':
        return list(AllTests.get(config).values())

    test_list = []
    for t in test_args:
        logging.debug('test: %s', t)
        test_config = AllTests.get(config).get(t)
        if test_config is None:
            logging.error('Unable to find test config for "%s"', t)
            sys.exit(1)
        test_list.append(test_config)

    return test_list


def main():
    parser = argparse.ArgumentParser()

    default_board = 'bloonchipper'
    parser.add_argument(
        '--board', '-b',
        help='Board (default: ' + default_board + ')',
        default=default_board)

    default_tests = 'all'
    parser.add_argument(
        '--tests', '-t',
        nargs='+',
        help='Tests (default: ' + default_tests + ')',
        default=default_tests)

    log_level_choices = ['DEBUG', 'INFO', 'WARNING', 'ERROR', 'CRITICAL']
    parser.add_argument(
        '--log_level', '-l',
        choices=log_level_choices,
        default='DEBUG'
    )

    args = parser.parse_args()
    logging.basicConfig(level=args.log_level)

    if args.board not in BOARD_CONFIGS:
        logging.error('Unable to find a config for board: "%s"', args.board)
        sys.exit(1)

    board_config = BOARD_CONFIGS[args.board]

    e = ThreadPoolExecutor(max_workers=1)

    test_list = get_test_list(board_config, args.tests)
    logging.debug('Running tests: %s', [t.name for t in test_list])

    for test in test_list:
        # build test binary
        build(test.name, args.board)

        # flash test binary
        # TODO(b/158327221): First attempt to flash fails after
        #  flash_write_protect test is run; works after second attempt.
        flash_succeeded = False
        for i in range(0, test.num_flash_attempts):
            logging.debug('Flash attempt %d', i + 1)
            if flash(test.name, args.board):
                flash_succeeded = True
                break
            time.sleep(1)

        if not flash_succeeded:
            logging.debug('Flashing failed after max attempts: %d',
                          test.num_flash_attempts)
            test.passed = False
            continue

        if test.toggle_power:
            power(args.board, board_config, on=False)
            time.sleep(1)
            power(args.board, board_config, on=True)

        hw_write_protect(args.board, test.enable_hw_write_protect)

        # run the test
        logging.info('Running test: "%s"', test.name)
        console = get_console(args.board, board_config)
        test.passed = run_test(test, console, executor=e)

    colorama.init()
    exit_code = 0
    for test in test_list:
        # print results
        print('Test "' + test.name + '": ', end='')
        if test.passed:
            print(colorama.Fore.GREEN + 'PASSED')
        else:
            print(colorama.Fore.RED + 'FAILED')
            exit_code = 1

        print(colorama.Style.RESET_ALL)

    e.shutdown(wait=False)
    sys.exit(exit_code)


if __name__ == '__main__':
  sys.exit(main())