#! /usr/bin/env python3

# Copyright (c) 2017 Linaro Limited.
#
# SPDX-License-Identifier: Apache-2.0

"""Zephyr flash/debug script

This script is a transparent replacement for existing Zephyr flash and debug
scripts, i.e. scripts to flash binaries, run them, and debug them on real or
emulated hardware. If it can invoke the relevant tools natively, it will do so;
otherwise, it delegates to the shell script."""

from os import path
import subprocess
import sys

from runner.core import ZephyrBinaryRunner, get_env_bool_or


# TODO: Stop using environment variables.
#
# Migrate the build system so we can use an argparse.ArgumentParser and
# per-flasher subparsers, so invoking the script becomes something like:
#
#   python zephyr_flash_debug.py openocd --openocd-bin=/openocd/path ...
#
# For now, maintain compatibility.
def run(shell_script_full, command, debug):
    shell_script = path.basename(shell_script_full)
    try:
        runner = ZephyrBinaryRunner.create_for_shell_script(shell_script,
                                                            command,
                                                            debug)
    except ValueError:
        # Unsupported; fall back on shell script.
        print('Unsupported, falling back on shell script',
              file=sys.stderr)
        subprocess.check_call([shell_script_full, command])
        return

    runner.run(command)


if __name__ == '__main__':
    commands = {'flash', 'debug', 'debugserver'}
    debug = True
    try:
        debug = get_env_bool_or('KBUILD_VERBOSE', False)
        if len(sys.argv) != 3 or sys.argv[1] not in commands:
            raise ValueError('usage: {} <{}> path-to-script'.format(
                sys.argv[0], '|'.join(commands)))
        run(sys.argv[2], sys.argv[1], debug)
    except Exception as e:
        if debug:
            raise
        else:
            print('Error: {}'.format(e), file=sys.stderr)
            print('Re-run with KBUILD_VERBOSE=1 for a stack trace.',
                  file=sys.stderr)
            sys.exit(1)