# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2015 Stephen Warren
# Copyright (c) 2015-2016, NVIDIA CORPORATION. All rights reserved.

"""
Logic to interact with the sandbox port of U-Boot, running as a sub-process.
"""

import time
from spawn import Spawn
from console_base import ConsoleBase

class ConsoleSandbox(ConsoleBase):
    """Represents a connection to a sandbox U-Boot console, executed as a sub-
    process."""

    def __init__(self, log, config):
        """Initialize a U-Boot console connection.

        Args:
            log (multiplexed_log.Logfile): Log file to write to
            config (ArbitraryAttributeContainer): ubconfig "configuration"
                object as defined in conftest.py
        """
        super().__init__(log, config, max_fifo_fill=1024)
        self.sandbox_flags = []
        self.use_dtb = True

    def get_spawn(self):
        """Connect to a fresh U-Boot instance.

        A new sandbox process is created, so that U-Boot begins running from
        scratch.

        Returns:
            A spawn.Spawn object that is attached to U-Boot.
        """
        self.prepare_for_spawn()
        bcfg = self.config.buildconfig
        config_spl = bcfg.get('config_spl', 'n') == 'y'
        config_vpl = bcfg.get('config_vpl', 'n') == 'y'
        if config_vpl:
            # Run TPL first, which runs VPL
            fname = '/tpl/u-boot-tpl'
        else:
            fname = '/spl/u-boot-spl' if config_spl else '/u-boot'
        print(fname)
        cmd = []
        if self.config.gdbserver:
            cmd += ['gdbserver', self.config.gdbserver]
        cmd += [self.config.build_dir + fname, '-v']
        if self.use_dtb:
            cmd += ['-d', self.config.dtb]
        cmd += self.sandbox_flags

        # Always disable the pager
        cmd.append('-P')

        # Always disable detected the terminal size
        cmd.append('-A')

        return Spawn(cmd, cwd=self.config.source_dir, decode_signal=True)

    def restart_uboot_with_flags(self, flags, use_dtb=True):
        """Run U-Boot with the given command-line flags

        Args:
            flags (list of str): List of flags to pass
            use_dtb (bool): True to use a device tree file, False to run without
                one

        Returns:
            A spawn.Spawn object that is attached to U-Boot.
        """
        try:
            self.sandbox_flags = flags
            self.use_dtb = use_dtb
            return self.restart_uboot(False)
        finally:
            self.sandbox_flags = []
            self.use_dtb = True

    def kill(self, sig):
        """Send a specific Unix signal to the sandbox process.

        Args:
            sig (int): Unix signal to send to the process
        """
        self.log.action(f'kill {sig}')
        self.p.kill(sig)

    def validate_exited(self):
        """Determine whether the sandbox process has exited.

        If required, this function waits a reasonable time for the process to
        exit.

        Returns:
            Boolean indicating whether the process has exited.
        """
        p = self.p
        self.p = None
        for _ in range(100):
            ret = not p.isalive()
            if ret:
                break
            time.sleep(0.1)
        p.close()
        return ret