# import pdb
# import re

from tune import Tune
from tune_list import TuneList


class Command(object):
    def __init__(self, argv):
        self.tune = Tune()
        self.tunes = TuneList()
        self.tunes.load()

        # prefixes
        self.separator = ':'
        self.pre = '-'

        # separate option and data argumets
        self.option = argv[1]
        self.data = self._format_to_dict(argv[2:])

        # possible options to pass as aruments
        self.add_key = (self.pre + 'a', self.pre + 'add')
        self.show_key = (self.pre + 's', self.pre + 'show')
        self.change_key = (self.pre + 'c', self.pre + 'change')
        self.info_key = (self.pre + 'i', self.pre + 'info')
        self.delete_key =\
            (self.pre + 'd', self.pre + 'del', self.pre + 'delete')

        # possible information about tune to pass
        self.artist_key = ('A', 'Artist')
        self.title_key = ('T', 'Title')
        self.genres_key = ('g', 'genre')
        self.sub_genres_key = ('s', 'sub_genre', 'sub-genre', 'sub')
        self.tags = ('t', 'tags')

    def _format_to_dict(self, args):
        '''Converts passed arguments into dictionary to easy'''
        data = dict()
        for element in args:
            # colon is main element of an argument so we need check
            # if argument contains it
            try:
                separator_index = element.index(self.separator)
            except ValueError:
                raise ValueError('Invalid syntax')

            # separate key and value, then update dictionary
            key = element[:separator_index]
            value = element[separator_index + 1:]
            data.update({key: value})

        return data

    def update(self):
        '''Main function in this class. First it recognizes,
        action should perform add, change or delete.
        Then call appropirate functions.'''

        # Add behaviour
        if self.option in self.add_key:
            self._add()
        elif self.option in self.show_key:
            self._show()
        elif self.option in self.change_key:
            self._change()
        elif self.option in self.info_key:
            self._info()
        elif self.option in self.delete_key:
            self._delete()

    def _add(self):

        # you should consider using property here instead
        # this function
        self._claim_data()
        self.tunes.add(self.tune)
        self.tunes.save()
        self.tunes.show()

    def _show(self):
        print('running _show function')
        self.tunes.show()

    def _change(self):
        if not self.tunes.dct:
            self.tunes.show()

        self.tunes.modify()
        self.tunes.save()

    def _info(self):
        if not self.tunes.dct:
            self.tunes.show()

        self.tunes.info()

    def _delete(self):
        print('running _delete function')
        if not self.tunes.dct:
            self._show()

        self.tunes.delete()
        self.tunes.save()

    def _claim_data(self):
        '''Updates single tune based on the users input'''

        for k, v in self.data.items():
            if k in self.artist_key:
                self.tune['artist'] = v
            elif k in self.title_key:
                self.tune['title'] = v
            elif k in self.genres_key:
                self.tune['genres'] = v.split()
            elif k in self.sub_genres_key:
                self.tune['sub_genres'] = v.split()
            elif k in self.tags:
                self.tune['tags'] = v.split()
            else:
                raise KeyError(f'No such attribute: "{k}"')