# Portions Copyright (c) Facebook, Inc. and its affiliates.
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2.

# urllibcompat.py - adapters to ease using urllib2 on Py2 and urllib on Py3
#
# Copyright 2017 Google, Inc.
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
from __future__ import absolute_import

import sys

from . import pycompat


_sysstr = pycompat.sysstr


class _pycompatstub(object):
    def __init__(self):
        self._aliases = {}

    def _registeraliases(self, origin, items):
        """Add items that will be populated at the first access"""
        items = list(map(_sysstr, items))
        self._aliases.update(
            (item.replace(_sysstr("_"), _sysstr("")).lower(), (origin, item))
            for item in items
        )

    def _registeralias(self, origin, attr, name):
        """Alias ``origin``.``attr`` as ``name``"""
        self._aliases[_sysstr(name)] = (origin, _sysstr(attr))

    def __getattr__(self, name):
        try:
            origin, item = self._aliases[name]
        except KeyError:
            raise AttributeError(name)
        self.__dict__[name] = obj = getattr(origin, item)
        return obj


httpserver = _pycompatstub()
urlreq = _pycompatstub()
urlerr = _pycompatstub()

if sys.version_info[0] >= 3:
    import urllib.parse

    urlreq._registeraliases(
        urllib.parse,
        (
            "splitattr",
            "splitpasswd",
            "splitport",
            "splituser",
            "urlparse",
            "urlunparse",
        ),
    )
    urlreq._registeralias(urllib.parse, "unquote", "unquote")
    import urllib.request

    urlreq._registeraliases(
        urllib.request,
        (
            "AbstractHTTPHandler",
            "BaseHandler",
            "build_opener",
            "FileHandler",
            "FTPHandler",
            "ftpwrapper",
            "HTTPHandler",
            "HTTPSHandler",
            "install_opener",
            "pathname2url",
            "HTTPBasicAuthHandler",
            "HTTPDigestAuthHandler",
            "HTTPPasswordMgrWithDefaultRealm",
            "ProxyHandler",
            "Request",
            "url2pathname",
            "urlopen",
        ),
    )
    import urllib.response

    urlreq._registeraliases(urllib.response, ("addclosehook", "addinfourl"))
    import urllib.error

    urlerr._registeraliases(urllib.error, ("HTTPError", "URLError"))
    import http.server

    httpserver._registeraliases(
        http.server,
        (
            "HTTPServer",
            "BaseHTTPRequestHandler",
            "SimpleHTTPRequestHandler",
            "CGIHTTPRequestHandler",
        ),
    )

    # urllib.parse.quote() accepts both str and bytes, decodes bytes
    # (if necessary), and returns str. This is wonky. We provide a custom
    # implementation that only accepts bytes and emits bytes.
    def quote(s, safe=r"/"):
        s = urllib.parse.quote(s, safe=safe)
        return s

    # urllib.parse.urlencode() returns str. We use this function to make
    # sure we return bytes.
    def urlencode(query, doseq=False):
        s = urllib.parse.urlencode(query, doseq=doseq)
        return s

    # pyre-fixme[16]: `_pycompatstub` has no attribute `quote`.
    urlreq.quote = quote
    # pyre-fixme[16]: `_pycompatstub` has no attribute `urlencode`.
    urlreq.urlencode = urlencode

    def getfullurl(req):
        return req.full_url

    def gethost(req):
        return req.host

    def getselector(req):
        return req.selector

    def getdata(req):
        return req.data

    def hasdata(req):
        return req.data is not None


else:
    import BaseHTTPServer

    import CGIHTTPServer

    import SimpleHTTPServer

    import urllib2
    import urllib

    import urlparse

    urlreq._registeraliases(
        urllib,
        (
            "addclosehook",
            "addinfourl",
            "ftpwrapper",
            "pathname2url",
            "quote",
            "splitattr",
            "splitpasswd",
            "splitport",
            "splituser",
            "unquote",
            "url2pathname",
            "urlencode",
        ),
    )
    urlreq._registeraliases(
        urllib2,
        (
            "AbstractHTTPHandler",
            "BaseHandler",
            "build_opener",
            "FileHandler",
            "FTPHandler",
            "HTTPBasicAuthHandler",
            "HTTPDigestAuthHandler",
            "HTTPHandler",
            "HTTPPasswordMgrWithDefaultRealm",
            "HTTPSHandler",
            "install_opener",
            "ProxyHandler",
            "Request",
            "urlopen",
        ),
    )
    urlreq._registeraliases(urlparse, ("urlparse", "urlunparse"))
    urlerr._registeraliases(urllib2, ("HTTPError", "URLError"))
    httpserver._registeraliases(
        BaseHTTPServer, ("HTTPServer", "BaseHTTPRequestHandler")
    )
    httpserver._registeraliases(SimpleHTTPServer, ("SimpleHTTPRequestHandler",))
    httpserver._registeraliases(CGIHTTPServer, ("CGIHTTPRequestHandler",))

    def gethost(req):
        return req.get_host()

    def getselector(req):
        return req.get_selector()

    def getfullurl(req):
        return req.get_full_url()

    def getdata(req):
        return req.get_data()

    def hasdata(req):
        return req.has_data()