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import sys

WARNED = False


def print_version_warning():
    global WARNED
    if not WARNED:
        from warnings import warn
        warn("You are using an untested version of pip. GraalPy " +
             "provides patches and workarounds for a number of packages when used with " +
             "compatible pip versions. We recommend to stick with the pip version that " +
             "ships with this version of GraalPy.", RuntimeWarning)
        WARNED = True


class PipLoader:
    def __init__(self, real_loader):
        self.real_loader = real_loader

    def create_module(self, spec):
        return self.real_loader.create_module(spec)

    def exec_module(self, module):
        self.real_loader.exec_module(module)
        if not getattr(module, '__GRAALPY_PATCHED', False):
            print_version_warning()


class PipImportHook:
    @staticmethod
    def _wrap_real_spec(fullname, path, target):
        for finder in sys.meta_path:
            if finder is PipImportHook:
                continue
            real_spec = finder.find_spec(fullname, path, target)
            if real_spec:
                real_spec.loader = PipLoader(real_spec.loader)
                return real_spec

    @staticmethod
    def find_spec(fullname, path, target=None):
        if fullname == "pip":
            return PipImportHook._wrap_real_spec(fullname, path, target)


sys.meta_path.insert(0, PipImportHook)