from argparse import Namespace

from torch import nn
from torch.nn import ModuleList

from ml_lib.modules.blocks import ConvModule, LinearModule
from ml_lib.modules.util import LightningBaseModule
from util.module_mixins import (BaseOptimizerMixin, BaseTrainMixin, BaseValMixin, DatasetMixin,
                                BaseDataloadersMixin)


class ConvClassifier(DatasetMixin,
                     BaseDataloadersMixin,
                     BaseTrainMixin,
                     BaseValMixin,
                     BaseOptimizerMixin,
                     LightningBaseModule
                     ):

    def __init__(self, hparams):
        super(ConvClassifier, self).__init__(hparams)

        # Dataset
        # =============================================================================
        self.dataset = self.build_dataset()

        # Model Paramters
        # =============================================================================
        # Additional parameters
        self.in_shape = self.dataset.train_dataset.sample_shape
        self.conv_filters = self.params.filters

        # Modules with Parameters
        self.conv_list = ModuleList()
        last_shape = self.in_shape
        k = 3  # Base Kernel Value
        for filters in self.conv_filters:
            self.conv_list.append(ConvModule(last_shape, filters, (k, k), conv_stride=(2, 2), conv_padding=2,
                                             **self.params.module_kwargs))
            last_shape = self.conv_list[-1].shape
            # self.conv_list.append(ConvModule(last_shape, 1, 1, conv_stride=1, **self.params.module_kwargs))
            # last_shape = self.conv_list[-1].shape

        self.full_1 = LinearModule(self.conv_list[-1].shape, self.params.lat_dim, **self.params.module_kwargs)
        self.full_2 = LinearModule(self.full_1.shape, self.full_1.shape * 2, **self.params.module_kwargs)
        self.full_3 = LinearModule(self.full_2.shape, self.full_2.shape // 2, **self.params.module_kwargs)

        self.full_out = LinearModule(self.full_3.shape, 1, bias=self.params.bias, activation=nn.Sigmoid)

    def forward(self, batch, **kwargs):
        tensor = batch
        for conv in self.conv_list:
            tensor = conv(tensor)
        tensor = self.full_1(tensor)
        tensor = self.full_2(tensor)
        tensor = self.full_3(tensor)
        tensor = self.full_out(tensor)
        return Namespace(main_out=tensor)