# scopes.shape

"""really abstract basic data shape definitions"""

from scopes.util import keywords as k

class Record:

    headFields = ()     # to be defined by subclass
    headFieldsAsKeywords = set()
    defaultHeadValue = ''

    def __init__(self, *headValues, data=None, **kw):
        self.head = dict((k, self.defaultHeadValue) for k in self.headFields)
        for k, v in kw.items():
            self.set(k, v)
        for ix, hv in enumerate(headValues):
            self.set(self.headFields[ix], hv)
        self.data = data or {}

    @property
    def headValues(self):
        return [self.head[k] for k in self.headFields]

    def set(self, attr, value):
        if attr in self.headFields:
            if value is None:
                value = self.defaultHeadValue
            elif attr in self.headFieldsAsKeywords:
                value = k(value)
            self.head[attr] = value
            setattr(self, attr, value)
        else:
            raise AttributeError(attr)

    def update(self, data, overwrite=False):
        if data is None:
            return
        if overwrite:
            self.data = data
        else:
            self.data.update(data)

    def __repr__(self):
        return f'<{self.__class__.__name__}: {self.headValues}, {self.data}>'

    def asDict(self):
        return dict(head=self.head, data=self.data)