#!/usr/bin/env python3
"""Fortran to Python Interface Generator.

Copyright 1999 -- 2011 Pearu Peterson all rights reserved.
Copyright 2011 -- present NumPy Developers.
Permission to use, modify, and distribute this software is given under the terms
of the NumPy License.

NO WARRANTY IS EXPRESSED OR IMPLIED.  USE AT YOUR OWN RISK.
"""
__all__ = ['run_main', 'compile', 'get_include']

import sys
import subprocess
import os
import warnings

from numpy.exceptions import VisibleDeprecationWarning
from . import f2py2e
from . import diagnose

run_main = f2py2e.run_main
main = f2py2e.main


def compile(source,
            modulename='untitled',
            extra_args='',
            verbose=True,
            source_fn=None,
            extension='.f',
            full_output=False
           ):
    """
    Build extension module from a Fortran 77 source string with f2py.

    Parameters
    ----------
    source : str or bytes
        Fortran source of module / subroutine to compile

        .. versionchanged:: 1.16.0
           Accept str as well as bytes

    modulename : str, optional
        The name of the compiled python module
    extra_args : str or list, optional
        Additional parameters passed to f2py

        .. versionchanged:: 1.16.0
            A list of args may also be provided.

    verbose : bool, optional
        Print f2py output to screen
    source_fn : str, optional
        Name of the file where the fortran source is written.
        The default is to use a temporary file with the extension
        provided by the ``extension`` parameter
    extension : ``{'.f', '.f90'}``, optional
        Filename extension if `source_fn` is not provided.
        The extension tells which fortran standard is used.
        The default is ``.f``, which implies F77 standard.

        .. versionadded:: 1.11.0

    full_output : bool, optional
        If True, return a `subprocess.CompletedProcess` containing
        the stdout and stderr of the compile process, instead of just
        the status code.

        .. versionadded:: 1.20.0


    Returns
    -------
    result : int or `subprocess.CompletedProcess`
        0 on success, or a `subprocess.CompletedProcess` if
        ``full_output=True``

    Examples
    --------
    .. literalinclude:: ../../source/f2py/code/results/compile_session.dat
        :language: python

    """
    import tempfile
    import shlex

    if source_fn is None:
        f, fname = tempfile.mkstemp(suffix=extension)
        # f is a file descriptor so need to close it
        # carefully -- not with .close() directly
        os.close(f)
    else:
        fname = source_fn

    if not isinstance(source, str):
        source = str(source, 'utf-8')
    try:
        with open(fname, 'w') as f:
            f.write(source)

        args = ['-c', '-m', modulename, f.name]

        if isinstance(extra_args, str):
            is_posix = (os.name == 'posix')
            extra_args = shlex.split(extra_args, posix=is_posix)

        args.extend(extra_args)

        c = [sys.executable,
             '-c',
             'import numpy.f2py as f2py2e;f2py2e.main()'] + args
        try:
            cp = subprocess.run(c, capture_output=True)
        except OSError:
            # preserve historic status code used by exec_command()
            cp = subprocess.CompletedProcess(c, 127, stdout=b'', stderr=b'')
        else:
            if verbose:
                print(cp.stdout.decode())
    finally:
        if source_fn is None:
            os.remove(fname)

    if full_output:
        return cp
    else:
        return cp.returncode


def get_include():
    """
    Return the directory that contains the ``fortranobject.c`` and ``.h`` files.

    .. note::

        This function is not needed when building an extension with
        `numpy.distutils` directly from ``.f`` and/or ``.pyf`` files
        in one go.

    Python extension modules built with f2py-generated code need to use
    ``fortranobject.c`` as a source file, and include the ``fortranobject.h``
    header. This function can be used to obtain the directory containing
    both of these files.

    Returns
    -------
    include_path : str
        Absolute path to the directory containing ``fortranobject.c`` and
        ``fortranobject.h``.

    Notes
    -----
    .. versionadded:: 1.21.1

    Unless the build system you are using has specific support for f2py,
    building a Python extension using a ``.pyf`` signature file is a two-step
    process. For a module ``mymod``:

    * Step 1: run ``python -m numpy.f2py mymod.pyf --quiet``. This
      generates ``_mymodmodule.c`` and (if needed)
      ``_fblas-f2pywrappers.f`` files next to ``mymod.pyf``.
    * Step 2: build your Python extension module. This requires the
      following source files:

      * ``_mymodmodule.c``
      * ``_mymod-f2pywrappers.f`` (if it was generated in Step 1)
      * ``fortranobject.c``

    See Also
    --------
    numpy.get_include : function that returns the numpy include directory

    """
    return os.path.join(os.path.dirname(__file__), 'src')


def __getattr__(attr):

    # Avoid importing things that aren't needed for building
    # which might import the main numpy module
    if attr == "test":
        from numpy._pytesttester import PytestTester
        test = PytestTester(__name__)
        return test

    else:
        raise AttributeError("module {!r} has no attribute "
                              "{!r}".format(__name__, attr))


def __dir__():
    return list(globals().keys() | {"test"})
