#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""Wrapper script to use Pywikibot in 'directory' mode.

Run scripts using:

    python pwb.py <name_of_script> <options>

and it will use the package directory to store all user files, will fix up
search paths so the package does not need to be installed, etc.
"""
# (C) Pywikibot team, 2015-2018
#
# Distributed under the terms of the MIT license.
#
from __future__ import absolute_import, print_function, unicode_literals

# The following snippet was developed by Ned Batchelder (and others)
# for coverage [1], with python 3 support [2] added later,
# and is available under the BSD license (see [3])
# [1] https://bitbucket.org/ned/coveragepy/src/b5abcee50dbe/coverage/execfile.py
# [2] https://bitbucket.org/ned/coveragepy/src/fd5363090034/coverage/execfile.py
# [3] https://bitbucket.org/ned/coveragepy/src/2c5fb3a8b81c/setup.py?at=default#cl-31

import os
import sys
import types

from warnings import warn

PYTHON_VERSION = sys.version_info[:3]
PY2 = (PYTHON_VERSION[0] == 2)

versions_required_message = """
Pywikibot is not available on:
{version}

This version of Pywikibot only supports Python 2.7.2+ or 3.4+.
"""


def python_is_supported():
    """Check that Python is supported."""
    # Any change to this must be copied to setup.py
    return PYTHON_VERSION >= (3, 4, 0) or PY2 and PYTHON_VERSION >= (2, 7, 2)


if not python_is_supported():
    print(versions_required_message.format(version=sys.version))
    sys.exit(1)

pwb = None


def remove_modules():
    """Remove pywikibot modules."""
    for name in list(sys.modules):
        if name.startswith('pywikibot'):
            del sys.modules[name]


def tryimport_pwb():
    """Try to import pywikibot.

    If so, we need to patch pwb.argvu, too.
    If pywikibot is not available, we create a mock object to remove the
    need for if statements further on.
    """
    global pwb
    try:
        import pywikibot
    except RuntimeError:
        remove_modules()
        os.environ['PYWIKIBOT2_NO_USER_CONFIG'] = '2'
        import pywikibot  # noqa: E402
    pwb = pywikibot


def run_python_file(filename, argv, argvu, package=None):
    """Run a python file as if it were the main program on the command line.

    `filename` is the path to the file to execute, it need not be a .py file.
    `args` is the argument array to present as sys.argv, as unicode strings.

    """
    tryimport_pwb()

    # Create a module to serve as __main__
    old_main_mod = sys.modules['__main__']
    # it's explicitly using str() to bypass unicode_literals in Python 2
    main_mod = types.ModuleType(str('__main__'))
    sys.modules['__main__'] = main_mod
    main_mod.__file__ = filename
    if sys.version_info[0] > 2:
        main_mod.__builtins__ = sys.modules['builtins']
    else:
        main_mod.__builtins__ = sys.modules['__builtin__']
    if package:
        # it's explicitly using str() to bypass unicode_literals in Python 2
        main_mod.__package__ = str(package)

    # Set sys.argv and the first path element properly.
    old_argv = sys.argv
    old_argvu = pwb.argvu
    old_path0 = sys.path[0]

    sys.argv = argv
    pwb.argvu = argvu
    sys.path[0] = os.path.dirname(filename)

    try:
        with open(filename, 'rb') as f:
            source = f.read()
        exec(compile(source, filename, "exec", dont_inherit=True),
             main_mod.__dict__)
    finally:
        # Restore the old __main__
        sys.modules['__main__'] = old_main_mod

        # Restore the old argv and path
        sys.argv = old_argv
        sys.path[0] = old_path0
        pwb.argvu = old_argvu

# end of snippet from coverage


def abspath(path):
    """Convert path to absolute path, with uppercase drive letter on win32."""
    path = os.path.abspath(path)
    if path[0] != '/':
        # normalise Windows drive letter
        path = path[0].upper() + path[1:]
    return path


# Establish a normalised path for the directory containing pwb.py.
# Either it is '.' if the user's current working directory is the same,
# or it is the absolute path for the directory of pwb.py
absolute_path = abspath(os.path.dirname(sys.argv[0]))
rewrite_path = absolute_path

sys.path = [sys.path[0], rewrite_path,
            os.path.join(rewrite_path, 'pywikibot', 'compat'),
            ] + sys.path[1:]

try:
    import requests
except ImportError as e:
    raise ImportError("{0}\nPython module 'requests' is required.\n"
                      "Try running 'pip install requests'.".format(e))
del requests

if len(sys.argv) > 1 and sys.argv[1][0] != '-':
    filename = sys.argv[1]
    if not filename.endswith('.py'):
        filename += '.py'
else:
    filename = None

# Skip the filename if one was given
args = sys.argv[(2 if filename else 1):]

# Search for user-config.py before creating one.
try:
    # If successful, user-config.py already exists in one of the candidate
    # directories. See config2.py for details on search order.
    # Use env var to communicate to config2.py pwb.py location (bug T74918).
    _pwb_dir = os.path.split(__file__)[0]
    if sys.platform == 'win32' and sys.version_info[0] < 3:
        _pwb_dir = str(_pwb_dir)
    os.environ[str('PYWIKIBOT2_DIR_PWB')] = _pwb_dir
    import pywikibot
    pwb = pywikibot
except RuntimeError:
    # user-config.py to be created
    if filename is not None and not (filename.startswith('generate_')
                                     or filename == 'version.py'):
        print("NOTE: 'user-config.py' was not found!")
        print("Please follow the prompts to create it:")
        run_python_file(os.path.join(_pwb_dir, 'generate_user_files.py'),
                        ['generate_user_files.py'],
                        ['generate_user_files.py'])
        # because we have loaded pywikibot without user-config.py loaded, we need to re-start
        # the entire process. Ask the user to do so.
        print('Now, you have to re-execute the command to start your script.')
        sys.exit(1)


def main():
    """Command line entry point."""
    global filename
    if filename:
        file_package = None
        tryimport_pwb()
        argvu = pwb.argvu[1:]
        if not os.path.exists(filename):
            script_paths = ['scripts',
                            'scripts.maintenance',
                            'scripts.archive',
                            'scripts.userscripts']
            from pywikibot import config  # noqa: E402
            if config.user_script_paths:
                if isinstance(config.user_script_paths, (tuple, list)):
                    script_paths = config.user_script_paths + script_paths
                else:
                    warn("'user_script_paths' must be a list or tuple,\n"
                         'found: {0}. Ignoring this setting.'
                         ''.format(type(config.user_script_paths)))
            for file_package in script_paths:
                paths = file_package.split('.') + [filename]
                testpath = os.path.join(_pwb_dir, *paths)
                if os.path.exists(testpath):
                    filename = testpath
                    break
            else:
                raise OSError("%s not found!" % filename)

        # When both pwb.py and the filename to run are within the current
        # working directory:
        # a) set __package__ as if called using python -m scripts.blah.foo
        # b) set __file__ to be relative, so it can be relative in backtraces,
        #    and __file__ *appears* to be an unstable path to load data from.
        # This is a rough (and quick!) emulation of 'package name' detection.
        # a much more detailed implementation is in coverage's find_module.
        # https://bitbucket.org/ned/coveragepy/src/default/coverage/execfile.py
        cwd = abspath(os.getcwd())
        if absolute_path == cwd:
            absolute_filename = abspath(filename)[:len(cwd)]
            if absolute_filename == cwd:
                relative_filename = os.path.relpath(filename)
                # remove the filename, and use '.' instead of path separator.
                file_package = os.path.dirname(
                    relative_filename).replace(os.sep, '.')
                filename = os.path.join(os.curdir, relative_filename)

        if file_package and file_package not in sys.modules:
            try:
                __import__(file_package)
            except ImportError as e:
                warn('Parent module %s not found: %s'
                     % (file_package, e), ImportWarning)

        run_python_file(filename, [filename] + args, argvu, file_package)
        return True
    else:
        return False


if __name__ == '__main__':
    if not main():
        print(__doc__)