# This file contains functions for training a PyTorch MNIST Model
import torch
import torch.nn as nn
import torch.nn.functional as F
import torch.optim as optim
from torchvision import datasets, transforms
from torch.autograd import Variable

import numpy as np
import os

from random import randint

# Network
class Net(nn.Module):
    def __init__(self):
        super(Net, self).__init__()
        self.conv1 = nn.Conv2d(1, 20, kernel_size=5)
        self.conv2 = nn.Conv2d(20, 50, kernel_size=5)
        self.conv2_drop = nn.Dropout2d()
        self.fc1 = nn.Linear(800, 500)
        self.fc2 = nn.Linear(500, 10)

    def forward(self, x):
        x = F.max_pool2d(self.conv1(x), kernel_size=2, stride=2)
        x = F.max_pool2d(self.conv2(x), kernel_size=2, stride=2)
        x = x.view(-1, 800)
        x = F.relu(self.fc1(x))
        x = self.fc2(x)
        return F.log_softmax(x, dim=1)

class MnistModel(object):
    def __init__(self):
        self.batch_size = 64
        self.test_batch_size = 100
        self.learning_rate = 0.01
        self.sgd_momentum = 0.9
        self.log_interval = 100
        # Fetch MNIST data set.
        self.train_loader = torch.utils.data.DataLoader(
            datasets.MNIST('/tmp/mnist/data', train=True, download=True, transform=transforms.Compose([
                transforms.ToTensor(),
                transforms.Normalize((0.1307,), (0.3081,))
                ])),
            batch_size=self.batch_size,
            shuffle=True)
        self.test_loader = torch.utils.data.DataLoader(
            datasets.MNIST('/tmp/mnist/data', train=False, transform=transforms.Compose([
                transforms.ToTensor(),
                transforms.Normalize((0.1307,), (0.3081,))
                ])),
            batch_size=self.test_batch_size,
            shuffle=True)
        self.network = Net()

    # Train the network for several epochs, validating after each epoch.
    def learn(self, num_epochs=5):
        # Train the network for a single epoch
        def train(epoch):
            self.network.train()
            optimizer = optim.SGD(self.network.parameters(), lr=self.learning_rate, momentum=self.sgd_momentum)
            for batch, (data, target) in enumerate(self.train_loader):
                data, target = Variable(data), Variable(target)
                optimizer.zero_grad()
                output = self.network(data)
                loss = F.nll_loss(output, target)
                loss.backward()
                optimizer.step()
                if batch % self.log_interval == 0:
                    print('Train Epoch: {} [{}/{} ({:.0f}%)]\tLoss: {:.6f}'.format(epoch, batch * len(data), len(self.train_loader.dataset), 100. * batch / len(self.train_loader), loss.data.item()))

        # Test the network
        def test(epoch):
            self.network.eval()
            test_loss = 0
            correct = 0
            for data, target in self.test_loader:
                with torch.no_grad():
                    data, target = Variable(data), Variable(target)
                output = self.network(data)
                test_loss += F.nll_loss(output, target).data.item()
                pred = output.data.max(1)[1]
                correct += pred.eq(target.data).cpu().sum()
            test_loss /= len(self.test_loader)
            print('\nTest set: Average loss: {:.4f}, Accuracy: {}/{} ({:.0f}%)\n'.format(test_loss, correct, len(self.test_loader.dataset), 100. * correct / len(self.test_loader.dataset)))

        for e in range(num_epochs):
            train(e + 1)
            test(e + 1)

    def get_weights(self):
        return self.network.state_dict()

    def get_random_testcase(self):
        data, target = next(iter(self.test_loader))
        case_num = randint(0, len(data) - 1)
        test_case = data.numpy()[case_num].ravel().astype(np.float32)
        test_name = target.numpy()[case_num]
        return test_case, test_name
