# Copyright 2017  Lars Wirzenius
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# =*= License: GPL-3+ =*=


import logging
import os
import subprocess
import sys


_verbose = False


def set_verbose_progress(verbose):
    global _verbose
    _verbose = verbose


def error(msg):
    logging.error(msg, exc_info=True)
    sys.stderr.write("ERROR: {}\n".format(msg))
    sys.stderr.flush()


def progress(msg):
    logging.info(msg)
    if _verbose:
        sys.stdout.write("{}\n".format(msg))
        sys.stdout.flush()


def runcmd(argv, **kwargs):
    progress("Exec: %r" % (argv,))
    env = kwargs.get("env", os.environ.copy())
    env["LC_ALL"] = "C.UTF8"
    kwargs["env"] = env
    kwargs["stdout"] = kwargs.get("stdout", subprocess.PIPE)
    kwargs["stderr"] = kwargs.get("stderr", subprocess.PIPE)
    p = subprocess.Popen(argv, **kwargs)
    out, err = p.communicate()
    logging.debug("STDOUT: %s", out.decode("UTF8"))
    logging.debug("STDERR: %s", err.decode("UTF8"))
    if p.returncode != 0:
        raise RuncmdError("Program failed: {}".format(p.returncode))
    return out


def runcmd_chroot(chroot, argv, *argvs, **kwargs):
    full_argv = ["chroot", chroot] + argv
    return runcmd(full_argv, *argvs, **kwargs)


def _procdir(chroot):
    proc = os.path.join(chroot, "proc")
    if not os.path.exists(proc):
        os.mkdir(proc, mode=0o755)
    return proc


def _log_stdout(data):
    logging.debug("STDOUT: %r", data)
    return data


def _log_stderr(data):
    logging.debug("STDERR: %r", data)
    return data


class RuncmdError(Exception):
    pass