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# vi: set ft=python sts=4 ts=4 sw=4 et:
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#
#   See COPYING file distributed along with the PyMVPA package for the
#   copyright and license terms.
#
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"""Provide system and PyMVPA information useful while reporting bugs
"""

__docformat__ = 'restructuredtext'

import time, sys, subprocess
import os
from os.path import join as pathjoin
import platform as pl
from tempfile import mkstemp
from io import StringIO

import mvpa2
from mvpa2.base import externals, cfg
from mvpa2.base.dochelpers import borrowkwargs

def _t2s(t):
    res = []
    for e in t:
        if isinstance(e, tuple):
            es = _t2s(e)
            if es != '':
                res += ['(%s)' % es]
        elif e != '':
            res += [e]
    return '/'.join(res)

__all__ = ['wtf', 'get_pymvpa_gitversion']


def get_pymvpa_gitversion():
    """PyMVPA version as reported by git.

    Returns
    -------
    None or str
      Version of PyMVPA according to git.
    """
    gitpath = pathjoin(os.path.dirname(mvpa2.__file__), os.path.pardir)
    gitpathgit = pathjoin(gitpath, '.git')
    if not os.path.exists(gitpathgit):
        return None
    ver = None
    try:
        (tmpd, tmpn) = mkstemp('mvpa', 'git')
        retcode = subprocess.call(['git',
                                   '--git-dir=%s' % gitpathgit,
                                   '--work-tree=%s' % gitpath,
                                   'describe', '--abbrev=4', 'HEAD'
                                   ],
                                  stdout=tmpd,
                                  stderr=subprocess.STDOUT)
        outline = open(tmpn, 'r').readlines()[0].strip()
        if outline.startswith('upstream/'):
            ver = outline.replace('upstream/', '')
    finally:
        os.remove(tmpn)
    return ver


class WTF(object):
    """Convenience class to contain information about PyMVPA and OS

    TODO: refactor to actually not contain just string representation
    but rather a dictionary (of dictionaries)
    """

    __knownitems__ = set(('process', 'runtime',
                          'externals', 'system', 'sources'))

    def __init__(self, include=None, exclude=None):
        """
        Parameters
        ----------
        include : list of str
          By default, all known (listed in `__knownitems__`) are reported.
          If only a limited set is needed to be reported -- specify it here.
        exclude : list of str
          If you want to exclude any item from being reported.
        """
        self._info = ''
        if include is None:
            report_items = self.__knownitems__.copy()
        else:
            # check first
            if not self.__knownitems__.issuperset(include):
                raise ValueError("Items %s provided in exclude are not known to WTF." \
                      " Known are %s" % \
                      (str(set(include).difference(self.__knownitems__)),
                       self.__knownitems__))
            report_items = set(include)

        if exclude is not None:
            # check if all are known
            if not self.__knownitems__.issuperset(exclude):
                raise ValueError("Items %s provided in exclude are not known to WTF." \
                      " Known are %s" % \
                      (str(set(exclude).difference(self.__knownitems__)),
                       self.__knownitems__))
            report_items = report_items.difference(exclude)
        self._report_items = report_items
        self._acquire()


    def _acquire_sources(self, out):
        out.write("PyMVPA:\n")
        out.write(" Version:       %s\n" % mvpa2.__version__)
        out.write(" Hash:          %s\n" % mvpa2.__hash__)
        out.write(" Path:          %s\n" % mvpa2.__file__)

        # Try to obtain git information if available
        out.write(" Version control (GIT):\n")
        try:
            gitpath = pathjoin(os.path.dirname(mvpa2.__file__), os.path.pardir)
            gitpathgit = pathjoin(gitpath, '.git')
            if os.path.exists(gitpathgit):
                for scmd, cmd in [
                    ('Status', ['status']),
                    ('Reference', 'show-ref -h HEAD'.split(' ')),
                    ('Difference from last release %s' % mvpa2.__version__,
                     ['diff', '--shortstat', 'upstream/%s...' % mvpa2.__version__])]:
                    try:
                        (tmpd, tmpn) = mkstemp('mvpa', 'git')
                        retcode = subprocess.call(['git',
                                                   '--git-dir=%s' % gitpathgit,
                                                   '--work-tree=%s' % gitpath] + cmd,
                                                  stdout=tmpd,
                                                  stderr=subprocess.STDOUT)
                    finally:
                        outlines = open(tmpn, 'r').readlines()
                        if len(outlines):
                            out.write('  %s:\n   %s' % (scmd, '   '.join(outlines)))
                        os.remove(tmpn)
                    #except Exception, e:
                    #    pass
            else:
                raise RuntimeError("%s is not under GIT" % gitpath)
        except Exception as e:
            out.write(' GIT information could not be obtained due "%s"\n' % e)


    def _acquire_system(self, out):
        out.write('SYSTEM:\n')
        out.write(' OS:            %s\n' %
                  ' '.join([os.name,
                            pl.system(),
                            pl.release(),
                            pl.version()]).rstrip())
        out.write(' Distribution:  %s\n' %
                  ' '.join([_t2s(pl.dist()),
                            _t2s(pl.mac_ver()),
                            _t2s(pl.win32_ver())]).rstrip())

    def _acquire_externals(self, out):
        # Test and list all dependencies:
        sdeps = {True: [], False: [], 'Error': []}
        for dep in sorted(externals._KNOWN):
            try:
                sdeps[externals.exists(dep, force=False)] += [dep]
            except:
                sdeps['Error'] += [dep]
        out.write('EXTERNALS:\n')
        out.write(' Present:       %s\n' % ', '.join(sdeps[True]))
        out.write(' Absent:        %s\n' % ', '.join(sdeps[False]))
        if len(sdeps['Error']):
            out.write(' Errors in determining: %s\n' % ', '.join(sdeps['Error']))

        SV = ('.__version__', )              # standard versioning
        out.write(' Versions of critical externals:\n')
        # First the ones known to externals,
        for k, v in sorted(externals.versions.items()):
            out.write('  %-12s: %s\n' % (k, str(v)))
        try:
            if externals.exists('matplotlib'):
                import matplotlib
                out.write(' Matplotlib backend: %s\n'
                          % matplotlib.get_backend())
        except Exception as exc:
            out.write(' Failed to determine backend of matplotlib due to "%s"'
                      % str(exc))

    def _acquire_runtime(self, out):
        out.write("RUNTIME:\n")
        out.write(" PyMVPA Environment Variables:\n")
        pymvpa_envvars = '  '.join([
            '%-20s: "%s"\n' % (str(k), str(v))
            for k, v in os.environ.items()
            if (k.startswith('MVPA') or k.startswith('PYTHON'))
        ])
        if pymvpa_envvars:
            out.write('  ' + pymvpa_envvars)

        out.write(" PyMVPA Runtime Configuration:\n")
        out.write('  ' + str(cfg).replace('\n', '\n  ').rstrip() + '\n')

    def _acquire_process(self, out):
        try:
            procstat = open('/proc/%d/status' % os.getpid()).readlines()
            procstat += ['Python recursion limit: %d' % sys.getrecursionlimit()]
            out.write(' Process Information:\n')
            out.write('  ' + '  '.join(procstat))
        except:
            pass


    def _acquire(self):
        """
        TODO: refactor and redo ;)
        """
        out = StringIO()

        out.write("Current date:   %s\n" % time.strftime("%Y-%m-%d %H:%M"))

        # Little silly communicator/
        if 'sources' in self._report_items:
            self._acquire_sources(out)
        if 'system' in self._report_items:
            self._acquire_system(out)
        if 'externals' in self._report_items:
            self._acquire_externals(out)
        if 'runtime' in self._report_items:
            self._acquire_runtime(out)
        if 'process' in self._report_items:
            self._acquire_process(out)

        self._info = out.getvalue()


    def __repr__(self):
        if self._info is None:
            self._acquire()
        return self._info

    __str__ = __repr__


@borrowkwargs(WTF, '__init__')
def wtf(filename=None, **kwargs):
    """Report summary about PyMVPA and the system

    Parameters
    ----------
    filename : None or str
      If provided, information will be stored in a file, not printed
      to the screen
    **kwargs
      Passed to initialize `WTF` instance
    """

    info = WTF(**kwargs)
    if filename is not None:
        _ = open(filename, 'w').write(str(info))
    else:
        return info


if __name__ == '__main__':
    print(wtf())
