import json
import uuid
import sunspec2.mdef as mdef
import sunspec2.device as device
import sunspec2.mb as mb


class FileClientError(Exception):
    pass


class FileClientPoint(device.Point):

    def read(self):
        pass

    def write(self):
        pass


class FileClientGroup(device.Group):

    def read(self):
        pass

    def write(self):
        pass


class FileClientModel(FileClientGroup):
    def __init__(self, model_id=None, model_addr=0, model_len=0, model_def=None, data=None,
                 group_class=FileClientGroup, point_class=FileClientPoint):
        self.model_id = model_id
        self.model_addr = model_addr
        if model_len is None:
            self.model_len = 0
        else:
            self.model_len = model_len
        self.model_def = model_def
        self.error_info = ''
        self.mid = None
        self.device = None
        self.model = self

        gdef = None
        try:
            if self.model_def is None and model_id is not None:
                self.model_def = device.get_model_def(model_id)
            if self.model_def is not None:
                gdef = self.model_def.get(mdef.GROUP)
        except Exception as e:
            self.add_error(str(e))

        FileClientGroup.__init__(self, gdef=gdef, model=self, model_offset=0, group_len=self.model_len, data=data,
                                 data_offset=0, group_class=group_class, point_class=point_class)

    def add_error(self, error_info):
        self.error_info = '%s%s\n' % (self.error_info, error_info)


class FileClientDevice(device.Device):
    def __init__(self, filename=None, addr=40002, model_class=FileClientModel):
        device.Device.__init__(self, model_class=model_class)
        self.did = str(uuid.uuid4())
        self.filename = filename
        self.addr = addr

    def scan(self, data=None):
        try:
            if self.filename:
                f = open(self.filename)
                data = json.load(f)

                mid = 0
                addr = self.addr
                for m in data.get('models'):
                    model_id = m.get('ID')
                    model_len = m.get('L')
                    if model_id != mb.SUNS_END_MODEL_ID:
                        model = self.model_class(model_id=model_id, model_addr=addr, model_len=model_len,
                                                 model_def=None, data=m)
                        model.mid = '%s_%s' % (self.did, mid)
                        mid += 1
                        self.add_model(model)
                        addr += model.len
        except Exception as e:
            raise FileClientError(str(e))

    def read(self):
        return ''

    def write(self):
        return

    def close(self):
        return


class FileClient(FileClientDevice):
    pass