"""DANN model."""

import torch.nn as nn
from .functions import ReverseLayerF
from torchvision import models
import params


class Classifier(nn.Module):
    """ SVHN architecture without discriminator"""

    def __init__(self):
        super(Classifier, self).__init__()
        self.restored = False

        self.feature = nn.Sequential()
        self.feature.add_module('f_conv1', nn.Conv2d(1, 64, kernel_size=5))
        self.feature.add_module('f_bn1', nn.BatchNorm2d(64))
        self.feature.add_module('f_pool1', nn.MaxPool2d(2))
        self.feature.add_module('f_relu1', nn.ReLU(True))
        self.feature.add_module('f_conv2', nn.Conv2d(64, 50, kernel_size=5))
        self.feature.add_module('f_bn2', nn.BatchNorm2d(50))
        self.feature.add_module('f_drop1', nn.Dropout2d())
        self.feature.add_module('f_pool2', nn.MaxPool2d(2))
        self.feature.add_module('f_relu2', nn.ReLU(True))

        self.class_classifier = nn.Sequential()
        self.class_classifier.add_module('c_fc1', nn.Linear(50 * 4 * 4, 100))
        self.class_classifier.add_module('c_bn1', nn.BatchNorm2d(100))
        self.class_classifier.add_module('c_relu1', nn.ReLU(True))
        self.class_classifier.add_module('c_drop1', nn.Dropout2d())
        self.class_classifier.add_module('c_fc2', nn.Linear(100, 100))
        self.class_classifier.add_module('c_bn2', nn.BatchNorm2d(100))
        self.class_classifier.add_module('c_relu2', nn.ReLU(True))
        self.class_classifier.add_module('c_fc3', nn.Linear(100, 10))
        self.class_classifier.add_module('c_softmax', nn.LogSoftmax(dim=1))

    def forward(self, input_data):
        input_data = input_data.expand(input_data.data.shape[0], 1, 28, 28)
        feature = self.feature(input_data)
        feature = feature.view(-1, 50 * 4 * 4)
        class_output = self.class_classifier(feature)

        return class_output


class SVHNmodel(nn.Module):
    """ SVHN architecture"""

    def __init__(self):
        super(SVHNmodel, self).__init__()
        self.restored = False

        self.feature = nn.Sequential()
        self.feature.add_module('f_conv1', nn.Conv2d(1, 64, kernel_size=5))
        self.feature.add_module('f_bn1', nn.BatchNorm2d(64))
        self.feature.add_module('f_pool1', nn.MaxPool2d(2))
        self.feature.add_module('f_relu1', nn.ReLU(True))
        self.feature.add_module('f_conv2', nn.Conv2d(64, 50, kernel_size=5))
        self.feature.add_module('f_bn2', nn.BatchNorm2d(50))
        self.feature.add_module('f_drop1', nn.Dropout2d())
        self.feature.add_module('f_pool2', nn.MaxPool2d(2))
        self.feature.add_module('f_relu2', nn.ReLU(True))

        self.class_classifier = nn.Sequential()
        self.class_classifier.add_module('c_fc1', nn.Linear(50 * 4 * 4, 100))
        self.class_classifier.add_module('c_bn1', nn.BatchNorm2d(100))
        self.class_classifier.add_module('c_relu1', nn.ReLU(True))
        self.class_classifier.add_module('c_drop1', nn.Dropout2d())
        self.class_classifier.add_module('c_fc2', nn.Linear(100, 100))
        self.class_classifier.add_module('c_bn2', nn.BatchNorm2d(100))
        self.class_classifier.add_module('c_relu2', nn.ReLU(True))
        self.class_classifier.add_module('c_fc3', nn.Linear(100, 10))
        self.class_classifier.add_module('c_softmax', nn.LogSoftmax(dim=1))

        self.domain_classifier = nn.Sequential()
        self.domain_classifier.add_module('d_fc1', nn.Linear(50 * 4 * 4, 100))
        self.domain_classifier.add_module('d_bn1', nn.BatchNorm2d(100))
        self.domain_classifier.add_module('d_relu1', nn.ReLU(True))
        self.domain_classifier.add_module('d_fc2', nn.Linear(100, 2))
        self.domain_classifier.add_module('d_softmax', nn.LogSoftmax(dim=1))

    def forward(self, input_data, alpha):
        input_data = input_data.expand(input_data.data.shape[0], 1, 28, 28)
        feature = self.feature(input_data)
        feature = feature.view(-1, 50 * 4 * 4)
        reverse_feature = ReverseLayerF.apply(feature, alpha)
        class_output = self.class_classifier(feature)
        domain_output = self.domain_classifier(reverse_feature)

        return class_output, domain_output


class AlexModel(nn.Module):
    """ AlexNet pretrained on imagenet for Office dataset"""

    def __init__(self):
        super(AlexModel, self).__init__()
        self.restored = False
        model_alexnet = models.alexnet(pretrained=True)

        self.features = model_alexnet.features

        # self.classifier = nn.Sequential()
        # for i in range(5):
        #     self.classifier.add_module(
        #         "classifier" + str(i), model_alexnet.classifier[i])
        # self.__in_features = model_alexnet.classifier[4].in_features
        # self.classifier.add_module('classifier5', nn.Dropout())
        # self.classifier.add_module('classifier6', nn.Linear(self.__in_features, 256))
        # self.classifier.add_module('classifier7', nn.BatchNorm2d(256))
        # self.classifier.add_module('classifier8', nn.ReLU())
        # self.classifier.add_module('classifier9', nn.Dropout(0.5))
        # self.classifier.add_module('classifier10', nn.Linear(256, params.class_num_src))
        self.classifier = nn.Sequential(
            nn.Dropout(0.5),
            nn.Linear(256 * 6 * 6, 4096),
            nn.ReLU(inplace=True),
            nn.Dropout(0.5),
            nn.Linear(4096, 256),
            nn.ReLU(inplace=True),
            nn.Linear(256, params.class_num_src),
        )

        self.discriminator = nn.Sequential(
            nn.Linear(256 * 6 * 6, 1024),
            nn.ReLU(),
            nn.Dropout(0.5),
            nn.Linear(1024, 1024),
            nn.ReLU(),
            nn.Dropout(0.5),
            nn.Linear(1024, 2),
        )

    def forward(self, input_data, alpha):
        input_data = input_data.expand(input_data.data.shape[0], 3, 227, 227)
        feature = self.features(input_data)
        feature = feature.view(-1, 256 * 6 * 6)

        reverse_feature = ReverseLayerF.apply(feature, alpha)

        class_output = self.classifier(feature)

        domain_output = self.discriminator(reverse_feature)

        return class_output, domain_output