#!/usr/bin/env python3

import os
import sys
import pylink
import serial.tools.list_ports
from test_common import (
    LogicMultiplexerTimeMeasurements,
    parse_nist_aead_test_vectors,
    DeviceUnderTestAeadUARTP,
    compare_dumps,
    eprint,
    run_nist_aead_test_line,
)


def get_serial():
    ports = serial.tools.list_ports.comports()
    devices = [
        p.device
        for p in ports
        if p.serial_number == 'FT2XA9MY'
    ]
    devices.sort()
    return serial.Serial(
        devices[0],
        baudrate=115200,
        timeout=5)


class F7(DeviceUnderTestAeadUARTP):
    RAM_SIZE = 0x50000

    def __init__(self, firmware_path, ram_pattern_path):
        DeviceUnderTestAeadUARTP.__init__(self, get_serial())
        self.jlink = pylink.JLink()
        self.jlink.open(779340002)
        self.firmware_path = firmware_path
        self.ram_pattern_path = ram_pattern_path

    def flash(self):
        jlink = self.jlink
        jlink.connect('STM32F746ZG')
        jlink.flash_file(self.firmware_path, 0x8000000)
        eprint("Firmware flashed.")
        jlink.flash_file(self.ram_pattern_path, 0x20000000)
        eprint("RAM flashed.")
        jlink.reset()
        jlink.restart()

    def dump_ram(self):
        jlink = self.jlink
        return bytes(jlink.memory_read8(0x20000000, F7.RAM_SIZE))


def main(argv):
    if len(argv) != 3:
        print("Usage: test LWC_AEAD_KAT.txt build_dir")
        return 1

    kat = list(parse_nist_aead_test_vectors(argv[1]))
    build_dir = argv[2]

    dut = F7(
        os.path.join(build_dir, 'build', 'f7.bin'),
        os.path.join(build_dir, 'ram_pattern.bin'))

    try:
        tool = LogicMultiplexerTimeMeasurements(0x000c)
        tool.begin_measurement()

        dut.flash()
        dut.prepare()
        sys.stdout.write("Board prepared\n")
        sys.stdout.flush()

        dump_a = dut.dump_ram()

        for i, m, ad, k, npub, c in kat:
            tool.arm()
            run_nist_aead_test_line(dut, i, m, ad, k, npub, c)
            tool.unarm()

            if i == 1:
                dump_b = dut.dump_ram()
                longest = compare_dumps(dump_a, dump_b)
                print("  longest chunk of untouched memory = %d" % longest)

    except Exception as ex:
        print("TEST FAILED")
        raise ex

    finally:
        tool.end_measurement()
        sys.stdout.flush()
        sys.stderr.flush()


if __name__ == "__main__":
    sys.exit(main(sys.argv))