from configparser import ConfigParser
import logging


class ChartConfig:
    """
    Class that holds the chart section of a configuration file (for an instrument).
    
    Attributes :
        chart_config (Section) : the Section corresponding to the "chart" section in the given configuration file
    """

    KEYS = ["cat", "color", "unit", "label"]

    def __init__(self, path):
        """
        Parameters :
            path (str) : the path to the configuration file
        """
        self.variables = {}
        cfgp = ConfigParser(interpolation=None)
        cfgp.optionxform = str
        cfgp.read(path)
        try:
            section = cfgp["chart"]
        except KeyError:
            return
        for key, raw_value in section.items():
            arguments = raw_value.split(",")
            keyword_mode = False
            config = {'cat': '*'}
            for i, argument in enumerate(arguments):
                argname, _, argvalue = argument.rpartition(':')
                if argname:
                    keyword_mode = True
                    config[argname] = argvalue
                else:
                    if keyword_mode:
                        logging.error('positional arg after keywd arg: %s=%r', key, raw_value)
                    else:
                        try:
                            if argvalue:
                                config[self.KEYS[i]] = argvalue
                        except Exception as e:
                            logging.error('%r in %s=%r', e, key, raw_value)
            self.variables[key] = config