from utils import *
import pytorch_lightning as pl

from models.shared_stuff import *

from sklearn import metrics

# TODO pr-auc
# TODO f1-score

class CNN(pl.LightningModule):
    def __init__(self, num_class):
        super(CNN, self).__init__()

        # init bn
        self.bn_init = nn.BatchNorm2d(1)

        # layer 1
        self.conv_1 = nn.Conv2d(1, 64, 3, padding=1)
        self.bn_1 = nn.BatchNorm2d(64)
        self.mp_1 = nn.MaxPool2d((2, 4))

        # layer 2
        self.conv_2 = nn.Conv2d(64, 128, 3, padding=1)
        self.bn_2 = nn.BatchNorm2d(128)
        self.mp_2 = nn.MaxPool2d((2, 4))

        # layer 3
        self.conv_3 = nn.Conv2d(128, 128, 3, padding=1)
        self.bn_3 = nn.BatchNorm2d(128)
        self.mp_3 = nn.MaxPool2d((2, 4))

        # layer 4
        self.conv_4 = nn.Conv2d(128, 128, 3, padding=1)
        self.bn_4 = nn.BatchNorm2d(128)
        self.mp_4 = nn.MaxPool2d((3, 5))

        # layer 5
        self.conv_5 = nn.Conv2d(128, 64, 3, padding=1)
        self.bn_5 = nn.BatchNorm2d(64)
        self.mp_5 = nn.MaxPool2d((4, 4))

        # classifier
        self.dense = nn.Linear(320, num_class)
        self.dropout = nn.Dropout(0.5)

    def forward(self, x):
        # x = x.unsqueeze(1)

        # init bn
        x = self.bn_init(x)
        # print(x.shape)
        # layer 1
        x = self.mp_1(nn.ELU()(self.bn_1(self.conv_1(x))))
        # print(x.shape)

        # layer 2
        x = nn.ELU()(self.bn_2(self.conv_2(x)))
        # x = self.mp_2(nn.ELU()(self.bn_2(self.conv_2(x))))
        # print(x.shape)

        # layer 3
        x = self.mp_3(nn.ELU()(self.bn_3(self.conv_3(x))))
        # print(x.shape)

        # layer 4
        # x = nn.ELU()(self.bn_4(self.conv_4(x)))
        x = self.mp_4(nn.ELU()(self.bn_4(self.conv_4(x))))
        # print(x.shape)

        # layer 5
        x = self.mp_5(nn.ELU()(self.bn_5(self.conv_5(x))))
        # print(x.shape)

        # classifier
        x = x.view(x.size(0), -1)
        # print("Lin input", x.shape)
        x = self.dropout(x)
        logit = nn.Sigmoid()(self.dense(x))
        # print(x.shape)

        return logit

    def my_loss(self, y_hat, y):
        return my_loss(y_hat, y)

    def forward_full_song(self, x, y):
        # print(x.shape)
        #TODO full song???
        return self.forward(x[:, :, :, :512])
        # y_hat = torch.zeros((x.shape[0], 56), requires_grad=True).cuda()
        # hop_size = 256
        # i=0
        # count = 0
        # while i < x.shape[-1]:
        #     y_hat += self.forward(x[:,:,:,i:i+512])
        #     i += hop_size
        #     count += 1
        # return y_hat/count

    def training_step(self, data_batch, batch_nb):
        x, _, y = data_batch
        y_hat = self.forward_full_song(x, y)
        y = y.float()
        y_hat = y_hat.float()
        return {'loss':self.my_loss(y_hat, y)}

    def validation_step(self, data_batch, batch_nb):
        # print("data_batch", data_batch)
        x, _, y = data_batch
        # print("x", x)
        # print("y", y)
        y_hat = self.forward_full_song(x, y)
        y = y.float()
        y_hat = y_hat.float()
        decisions = y_hat.t().cpu() > 0.5
        decisions = decisions.type(torch.float)
        rocauc = metrics.roc_auc_score(y.t().cpu(), y_hat.t().cpu())
        prauc = metrics.average_precision_score(y.t().cpu(), y_hat.t().cpu())
        _, _, fscore, _ = metrics.precision_recall_fscore_support(y.t().cpu(), decisions, average='micro')
        return {'val_loss': self.my_loss(y_hat, y),
                'val_rocauc':rocauc,
                'val_prauc':prauc,
                'val_fscore':fscore}

    def test_step(self, data_batch, batch_nb):
        return test_end(data_batch, batch_nb)


    def test_end(self, outputs):
        test_metrics = test_end(outputs)
        self.experiment.log(test_metrics)
        return test_metrics

    def validation_end(self, outputs):
        return validation_end(outputs)

    def test_step(self, data_batch, batch_nb):
        return test_step(self, data_batch, batch_nb)

    def test_end(self, outputs):
        return test_end(outputs)

    def configure_optimizers(self):
        return [torch.optim.Adam(self.parameters(), lr=1e-4)]  # from their code

    @pl.data_loader
    def tng_dataloader(self):
        return tng_dataloader()

    @pl.data_loader
    def val_dataloader(self):
        return val_dataloader()

    @pl.data_loader
    def test_dataloader(self):
        return test_dataloader()

    @staticmethod
    def add_model_specific_args(parent_parser):
        return parent_parser
        pass