from configparser import RawConfigParser
from os.path import splitext, basename, dirname, abspath


class Configuration:
    """
    Configuration manager that read the configuration from multiples nfo files that are commons for all interfaces
    The configuration will be read and overridden in the following order:
        NFO.txt -> nfo.txt -> directory_name.txt -> video_file.txt -> video_name.txt
        (value in the rightmost file override values in preceding files)

    Your interface may add to this list from either side. Refer to the plugin's description.
    A plugin can also override completely this configuration by using other means. For example the cli plugins takes
    command line arguments with more importance than any nfo file.

    Attributes:
        CONFIG_FILE     Filename for the base configuration file that should be used to set global behavior for
                        prismedia and its plugins
    """
    CONFIG_FILE = "prismedia.config"    # TODO: replace with "config.txt"? something else?

    def __init__(self):
        self.root_path = dirname(abspath(__file__))
        self.config_parser = RawConfigParser()
        self.configuration_file_list = []
        self.base_configuration_file = self.root_path + "/config/" + self.CONFIG_FILE
        self.config_parser.read(self.base_configuration_file)

    def read_commons_nfo(self, video_path, video_name):
        video_directory = dirname(video_path)
        directory_name = basename(video_directory)
        video_file = splitext(basename(video_path))[0]

        self.configuration_file_list.append(video_directory + "/" + "NFO.txt")
        self.configuration_file_list.append(video_directory + "/" + "nfo.txt")
        self.configuration_file_list.append(video_directory + "/" + directory_name + ".txt")
        self.configuration_file_list.append(video_directory + "/" + video_file + ".txt")
        if video_name and video_name != video_file:
            self.configuration_file_list.append(video_directory + "/" + video_name + ".txt")

        self.config_parser.read(self.configuration_file_list)

    # Do not use this in actual production ready code. Prismedia should not write any file
    # This can be used in local to see how a plugin's variable needs to be written in the global NFO
    # I am afraid that trying to save a plugin info will also save the current config for the video
    def _write_config(self):
        """
        Write the content of the ConfigParser in a file.
        """
        # Do not use `assert` since we want to do the opposite and optimize the other way around
        if not __debug__:
            raise AssertionError("The method `Configuration._write_config` should not be called in production")

        with open(self.base_configuration_file + "_generated", "w") as configFile:
            self.config_parser.write(configFile)


configuration_instance = Configuration()