#!/usr/bin/env python3

from importlib.machinery import PathFinder, FileFinder, SourcelessFileLoader
import sys

class WolfFileLoader(SourcelessFileLoader):
    def __init__(self, fullname, path):
        print('-- Created WolfFileLoader --')
        print('-- fullname: ' + str(fullname) + ' --')
        print('-- path: ' + str(path) + ' --')
        super().__init__(fullname, path)

    def get_code(self, fullname):
        print('-- Getting WOLF code --')
        ret = super().get_code(fullname)
        print('-- Returning: ' + str(ret))
        return ret

    def get_source(self, fullname):
        print('-- Getting WOLF source --')
        ret = super().get_source(fullname)
        print('-- Returning: ' + str(ret))
        return ret

class WolfFileFinder(FileFinder):
    def __init__(self, path, *loader_details):
        print('-- Created WolfFileFinder --')
        print('-- path: ' + str(path) + ' --')
        print('-- *loader_details:' + str(loader_details) + ' --')
        loader_details += ([WolfFileLoader, ['.wolf']],)
        print('-- *loader_details now: ' + str(loader_details) + ' --')
        super().__init__(path, *loader_details)

class WolfPathFinder(PathFinder):
    def __init__(self):
        super().__init__()

    @classmethod
    def find_module(cls, fullname, path=None):
        print('-- WolfPathFinder find_module called! --')
        return super().find_module(fullname, path)

    @classmethod
    def find_spec(cls, fullname, path=None, target=None):
        if path is None:
            return
        print('-- WolfPathFinder.find_spec called! --')
        print('fullname: ' + str(fullname))
        print('path: ' + str(path))
        print('target: ' + str(target))

        for p in path:
            wolfspec = WolfFileFinder(p).find_spec(fullname, target) 
            print('-- WolfFileFinder spec is: ' + str(wolfspec) + ' --')
            if wolfspec is not None:
                return wolfspec

        spec = super().find_spec(fullname, path, target)
        print('loaded spec:' + str(spec))
        return spec

sys.meta_path.insert(0, WolfPathFinder)

def debugger(*args, **kwargs):
    return __import__(*args, **kwargs)

if __name__ == '__main__':
    print('-- Testing Load of .wolf Extension --')
    print('-- sys.meta_path loaders set to: ' + str(sys.meta_path) + ' --')

    import wolftest

    print('-- wolftest is: ' + str(wolftest) + ' --')

    from wolftest.a import a

    print('-- a is: ' + str(a) + ' --')