# Copyright (c) 2009, Willow Garage, Inc.
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#       notice, this list of conditions and the following disclaimer.
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#       documentation and/or other materials provided with the distribution.
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#       contributors may be used to endorse or promote products derived from
#       this software without specific prior written permission.
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# Author Tully Foote/tfoote@willowgarage.com

from __future__ import print_function

import os
import sys
import stat
import subprocess
import tempfile

from .core import rd_debug

if sys.hexversion > 0x03000000:  # Python3
    python3 = True
else:
    python3 = False

env = dict(os.environ)
env['LANG'] = 'C'


def read_stdout(cmd, capture_stderr=False):
    """
    Execute given command and return stdout and if requested also stderr.

    :param cmd: command in a form that Popen understands (list of strings or one string)
    :param suppress_stderr: If evaluates to True, capture output from stderr as
    well and return it as well.
    :return: if `capture_stderr` is evaluates to False, return the stdout of
    the program as string (Note: stderr will be printed to the running
    terminal).  If it evaluates to True, tuple of strings: stdout output and
    standard error output each as string.
    """
    if capture_stderr:
        p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, env=env)
        std_out, std_err = p.communicate()
        if python3:
            return std_out.decode(), std_err.decode()
        else:
            return std_out, std_err
    else:
        p = subprocess.Popen(cmd, stdout=subprocess.PIPE, env=env)
        std_out, std_err = p.communicate()  # ignore stderr
        if python3:
            return std_out.decode()
        else:
            return std_out


def create_tempfile_from_string_and_execute(string_script, path=None, exec_fn=None):
    """
    :param path: (optional) path to temp directory, or ``None`` to use default temp directory, ``str``
    :param exec_fn: override subprocess.call with alternate executor (for testing)
    """
    if path is None:
        path = tempfile.gettempdir()

    result = 1
    try:
        fh = tempfile.NamedTemporaryFile('w', delete=False)
        fh.write(string_script)
        fh.close()
        rd_debug('Executing script below with cwd=%s\n{{{\n%s\n}}}\n' % (path, string_script))
        try:
            os.chmod(fh.name, stat.S_IRWXU)
            if exec_fn is None:
                result = subprocess.call(fh.name, cwd=path)
            else:
                result = exec_fn(fh.name, cwd=path)
        except OSError as ex:
            print('Execution failed with OSError: %s' % (ex))
    finally:
        if os.path.exists(fh.name):
            os.remove(fh.name)

    rd_debug('Return code was: %s' % (result))
    return result == 0
