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# A home for file logic which should sit above FileSystem, but
# below more complicated objects.

import zipfile

class Workspace(object):
    def __init__(self, filesystem, executive):
        self._filesystem = filesystem
        self._executive = executive  # FIXME: Remove if create_zip is moved to python.

    def find_unused_filename(self, directory, name, extension, search_limit=100):
        for count in range(search_limit):
            if count:
                target_name = "%s-%s.%s" % (name, count, extension)
            else:
                target_name = "%s.%s" % (name, extension)
            target_path = self._filesystem.join(directory, target_name)
            if not self._filesystem.exists(target_path):
                return target_path
        # If we can't find an unused name in search_limit tries, just give up.
        return None

    def create_zip(self, zip_path, source_path, zip_class=zipfile.ZipFile):
        # It's possible to create zips with Python:
        # zip_file = ZipFile(zip_path, 'w')
        # for root, dirs, files in os.walk(source_path):
        #     for path in files:
        #         absolute_path = os.path.join(root, path)
        #         zip_file.write(os.path.relpath(path, source_path))
        # However, getting the paths, encoding and compression correct could be non-trivial.
        # So, for now we depend on the environment having "zip" installed (likely fails on Win32)
        self._executive.run_command(['zip', '-r', zip_path, source_path])
        return zip_class(zip_path)