# Copyright (C) 2010 Google Inc. All rights reserved.
#
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# modification, are permitted provided that the following conditions
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import urllib
import zipfile

from webkitpy.common.net.networktransaction import NetworkTransaction
from webkitpy.common.system.fileset import FileSetFileHandle
from webkitpy.common.system.filesystem import FileSystem


class ZipFileSet(object):
    """The set of files in a zip file that resides at a URL (local or remote)"""
    def __init__(self, zip_url, filesystem=None, zip_factory=None):
        self._zip_url = zip_url
        self._temp_file = None
        self._zip_file = None
        self._filesystem = filesystem or FileSystem()
        self._zip_factory = zip_factory or self._retrieve_zip_file

    def _retrieve_zip_file(self, zip_url):
        temp_file = NetworkTransaction().run(lambda: urllib.urlretrieve(zip_url)[0])
        return (temp_file, zipfile.ZipFile(temp_file))

    def _load(self):
        if self._zip_file is None:
            self._temp_file, self._zip_file = self._zip_factory(self._zip_url)

    def open(self, filename):
        self._load()
        return FileSetFileHandle(self, filename, self._filesystem)

    def close(self):
        if self._temp_file:
            self._filesystem.remove(self._temp_file)
            self._temp_file = None

    def namelist(self):
        self._load()
        return self._zip_file.namelist()

    def read(self, filename):
        self._load()
        return self._zip_file.read(filename)

    def extract(self, filename, path):
        self._load()
        self._zip_file.extract(filename, path)

    def delete(self, filename):
        raise Exception("Can't delete from a ZipFileSet.")