import sys

from .compat import chardet

# This code exists for backwards compatibility reasons.
# I don't like it either. Just look the other way. :)

for package in ("urllib3", "idna"):
    vendored_package = "pip._vendor." + package
    locals()[package] = __import__(vendored_package)
    # This traversal is apparently necessary such that the identities are
    # preserved (requests.packages.urllib3.* is urllib3.*)
    for mod in list(sys.modules):
        if mod == vendored_package or mod.startswith(vendored_package + '.'):
            unprefixed_mod = mod[len("pip._vendor."):]
            sys.modules['pip._vendor.requests.packages.' + unprefixed_mod] = sys.modules[mod]

if chardet is not None:
    target = chardet.__name__
    for mod in list(sys.modules):
        if mod == target or mod.startswith(f"{target}."):
            imported_mod = sys.modules[mod]
            sys.modules[f"requests.packages.{mod}"] = imported_mod
            mod = mod.replace(target, "chardet")
            sys.modules[f"requests.packages.{mod}"] = imported_mod