#!/usr/bin/python3

# -*- coding: utf-8 -*-

#

# Copyright 2010 Per √ėyvind Karlsen <proyvind@moondrake.org>

# Copyright 2015 Neal Gompa <ngompa13@gmail.com>

#

# This program is free software. It may be redistributed and/or modified under

# the terms of the LGPL version 2.1 (or later).

#

# RPM python dependency generator, using .egg-info/.egg-link/.dist-info data

#

from __future__ import print_function

from getopt import getopt

from os.path import basename, dirname, isdir, sep

from sys import argv, stdin, version

from distutils.sysconfig import get_python_lib

from warnings import warn

opts, args = getopt(

    argv[1:], 'hPRrCEMmLl:',

    ['help', 'provides', 'requires', 'recommends', 'conflicts', 'extras', 'majorver-provides', 'majorver-only', 'legacy-provides' , 'legacy'])

Provides = False

Requires = False

Recommends = False

Conflicts = False

Extras = False

Provides_PyMajorVer_Variant = False

PyMajorVer_Deps = False

legacy_Provides = False

legacy = False

for o, a in opts:

    if o in ('-h', '--help'):

        print('-h, --help\tPrint help')

        print('-P, --provides\tPrint Provides')

        print('-R, --requires\tPrint Requires')

        print('-r, --recommends\tPrint Recommends')

        print('-C, --conflicts\tPrint Conflicts')

        print('-E, --extras\tPrint Extras ')

        print('-M, --majorver-provides\tPrint extra Provides with Python major version only')

        print('-m, --majorver-only\tPrint Provides/Requires with Python major version only')

        print('-L, --legacy-provides\tPrint extra legacy pythonegg Provides')

        print('-l, --legacy\tPrint legacy pythonegg Provides/Requires instead')

        exit(1)

    elif o in ('-P', '--provides'):

        Provides = True

    elif o in ('-R', '--requires'):

        Requires = True

    elif o in ('-r', '--recommends'):

        Recommends = True

    elif o in ('-C', '--conflicts'):

        Conflicts = True

    elif o in ('-E', '--extras'):

        Extras = True

    elif o in ('-M', '--majorver-provides'):

        Provides_PyMajorVer_Variant = True

    elif o in ('-m', '--majorver-only'):

        PyMajorVer_Deps = True

    elif o in ('-L', '--legacy-provides'):

        legacy_Provides = True

    elif o in ('-l', '--legacy'):

        legacy = True

if Requires:

    py_abi = True

else:

    py_abi = False

py_deps = {}

if args:

    files = args

else:

    files = stdin.readlines()

for f in files:

    f = f.strip()

    lower = f.lower()

    name = 'python(abi)'

    # add dependency based on path, versioned if within versioned python directory

    if py_abi and (lower.endswith('.py') or lower.endswith('.pyc') or lower.endswith('.pyo')):

        if name not in py_deps:

            py_deps[name] = []

        purelib = get_python_lib(standard_lib=1, plat_specific=0).split(version[:3])[0]

        platlib = get_python_lib(standard_lib=1, plat_specific=1).split(version[:3])[0]

        for lib in (purelib, platlib):

            if lib in f:

                spec = ('==', f.split(lib)[1].split(sep)[0])

                if spec not in py_deps[name]:

                    py_deps[name].append(spec)

    # XXX: hack to workaround RPM internal dependency generator not passing directories

    lower_dir = dirname(lower)

    if lower_dir.endswith('.egg') or \

            lower_dir.endswith('.egg-info') or \

            lower_dir.endswith('.dist-info'):

        lower = lower_dir

        f = dirname(f)

    # Determine provide, requires, conflicts & recommends based on egg/dist metadata

    if lower.endswith('.egg') or \

            lower.endswith('.egg-info') or \

            lower.endswith('.dist-info'):

        # This import is very slow, so only do it if needed

        from pkg_resources import Distribution, FileMetadata, PathMetadata

        dist_name = basename(f)

        if isdir(f):

            path_item = dirname(f)

            metadata = PathMetadata(path_item, f)

        else:

            path_item = f

            metadata = FileMetadata(f)

        dist = Distribution.from_location(path_item, dist_name, metadata)

        # Check if py_version is defined in the metadata file/directory name

        if not dist.py_version:

            # Try to parse the Python version from the path the metadata

            # resides at (e.g. /usr/lib/pythonX.Y/site-packages/...)

            import re

            res = re.search(r"/python(?P<pyver>\d+\.\d)/", path_item)

            if res:

                dist.py_version = res.group('pyver')

            else:

                warn("Version for {!r} has not been found".format(dist), RuntimeWarning)

                continue

        if Provides_PyMajorVer_Variant or PyMajorVer_Deps or legacy_Provides or legacy:

            # Get the Python major version

            pyver_major = dist.py_version.split('.')[0]

        if Provides:

            # If egg/dist metadata says package name is python, we provide python(abi)

            if dist.key == 'python':

                name = 'python(abi)'

                if name not in py_deps:

                    py_deps[name] = []

                py_deps[name].append(('==', dist.py_version))

            if not legacy or not PyMajorVer_Deps:

                name = 'python{}dist({})'.format(dist.py_version, dist.key)

                if name not in py_deps:

                    py_deps[name] = []

            if Provides_PyMajorVer_Variant or PyMajorVer_Deps:

                pymajor_name = 'python{}dist({})'.format(pyver_major, dist.key)

                if pymajor_name not in py_deps:

                    py_deps[pymajor_name] = []

            if legacy or legacy_Provides:

                legacy_name = 'pythonegg({})({})'.format(pyver_major, dist.key)

                if legacy_name not in py_deps:

                    py_deps[legacy_name] = []

            if dist.version:

                spec = ('==', dist.version)

                if spec not in py_deps[name]:

                    if not legacy:

                        py_deps[name].append(spec)

                    if Provides_PyMajorVer_Variant:

                        py_deps[pymajor_name].append(spec)

                    if legacy or legacy_Provides:

                        py_deps[legacy_name].append(spec)

        if Requires or (Recommends and dist.extras):

            name = 'python(abi)'

            # If egg/dist metadata says package name is python, we don't add dependency on python(abi)

            if dist.key == 'python':

                py_abi = False

                if name in py_deps:

                    py_deps.pop(name)

            elif py_abi and dist.py_version:

                if name not in py_deps:

                    py_deps[name] = []

                spec = ('==', dist.py_version)

                if spec not in py_deps[name]:

                    py_deps[name].append(spec)

            deps = dist.requires()

            if Recommends:

                depsextras = dist.requires(extras=dist.extras)

                if not Requires:

                    for dep in reversed(depsextras):

                        if dep in deps:

                            depsextras.remove(dep)

                deps = depsextras

            # add requires/recommends based on egg/dist metadata

            for dep in deps:

                if legacy:

                    name = 'pythonegg({})({})'.format(pyver_major, dep.key)

                else:

                    if PyMajorVer_Deps:

                        name = 'python{}dist({})'.format(pyver_major, dep.key)

                    else:

                        name = 'python{}dist({})'.format(dist.py_version, dep.key)

                for spec in dep.specs:

                    if spec[0] != '!=':

                        if name not in py_deps:

                            py_deps[name] = []

                        if spec not in py_deps[name]:

                            py_deps[name].append(spec)

                if not dep.specs:

                    py_deps[name] = []

        # Unused, for automatic sub-package generation based on 'extras' from egg/dist metadata

        # TODO: implement in rpm later, or...?

        if Extras:

            deps = dist.requires()

            extras = dist.extras

            print(extras)

            for extra in extras:

                print('%%package\textras-{}'.format(extra))

                print('Summary:\t{} extra for {} python package'.format(extra, dist.key))

                print('Group:\t\tDevelopment/Python')

                depsextras = dist.requires(extras=[extra])

                for dep in reversed(depsextras):

                    if dep in deps:

                        depsextras.remove(dep)

                deps = depsextras

                for dep in deps:

                    for spec in dep.specs:

                        if spec[0] == '!=':

                            print('Conflicts:\t{} {} {}'.format(dep.key, '==', spec[1]))

                        else:

                            print('Requires:\t{} {} {}'.format(dep.key, spec[0], spec[1]))

                print('%%description\t{}'.format(extra))

                print('{} extra for {} python package'.format(extra, dist.key))

                print('%%files\t\textras-{}\n'.format(extra))

        if Conflicts:

            # Should we really add conflicts for extras?

            # Creating a meta package per extra with recommends on, which has

            # the requires/conflicts in stead might be a better solution...

            for dep in dist.requires(extras=dist.extras):

                name = dep.key

                for spec in dep.specs:

                    if spec[0] == '!=':

                        if name not in py_deps:

                            py_deps[name] = []

                        spec = ('==', spec[1])

                        if spec not in py_deps[name]:

                            py_deps[name].append(spec)

names = list(py_deps.keys())

names.sort()

for name in names:

    if py_deps[name]:

        # Print out versioned provides, requires, recommends, conflicts

        for spec in py_deps[name]:

            print('{} {} {}'.format(name, spec[0], spec[1]))

    else:

        # Print out unversioned provides, requires, recommends, conflicts

        print(name)