from os import listdir

class ResourceFile(object):

    def __init__(fileName, buf=None):
        # Ooooh, what does this button do?
        # name(fileName)

        if buf:
            buffer = buf
            ownBuffer = False
        else:
            buffer = Buffer()
            ownBuffer = true

        try:
            with open(fileName, 'rb') as f:
                try:
                    sign = f.read(4)
                    if sign[0] != 'C' \
                       or sign[1] != 'R' \
                       or sign[2] != 'F' \
                       or sign[3]:
                        raise IOError("Failover")

                    major = f.unpack('i', 4)
                    minor = f.unpack('i', 4)
                    priority = f.unpack('i', 4)

                    if major != 2 or minor < 0:
                        raise Exception("Incompatible version of resource file '" + name + "'")
                except IOError:
                    raise Exception("Invalid resource file '" + name + "'")

                # How to reproduce this?
                # int readed = stream.gcount();

        except IOError:
            raise Exception("Error loading resource file '" + name + "'")

class ResourcesCollection:
    def __init__(self, directories):
        self.__files = []
        self.__buffer = None
        self.loadResourceFiles(directories)
        processFiles()

    def loadResourceFiles(self, directories):
        for directory in directories:
            try:
                for name in listdir(directory):
                    if not name.startswith('.') and name.endswith('.res'):
                        self.__files.append(ResourceFile(directory + '/' + name, self.__buffer));
            except OSError:
                pass