import torch
import torch.nn as nn
import torch.nn.functional as F
import Features

################################################################################
class BaseNet(nn.Module):
  def __init__(self, dicts, outputSize) :
    super().__init__()
    self.dummyParam = nn.Parameter(torch.empty(0), requires_grad=False)

    self.featureFunction = "b.-2 b.-1 b.0 b.1 b.2 s.0 s.1 s.2 s.0.0 s.0.-1 s.0.1 s.1.0 s.1.-1 s.1.1 s.2.0 s.2.-1 s.2.1"
    self.columns = ["UPOS", "FORM"]

    self.embSize = 64
    self.nbTargets = len(self.featureFunction.split())
    self.inputSize = len(self.columns)*self.nbTargets
    self.outputSize = outputSize
    for name in dicts.dicts :
      self.add_module("emb_"+name, nn.Embedding(len(dicts.dicts[name]), self.embSize))
    self.fc1 = nn.Linear(self.inputSize * self.embSize, 1600)
    self.fc2 = nn.Linear(1600, outputSize)
    self.dropout = nn.Dropout(0.3)

    self.apply(self.initWeights)

  def forward(self, x) :
    embeddings = []
    for i in range(len(self.columns)) :
      embeddings.append(getattr(self, "emb_"+self.columns[i])(x[...,i*self.nbTargets:(i+1)*self.nbTargets]))
    x = torch.cat(embeddings,-1)
    x = self.dropout(x.view(x.size(0),-1))
    x = F.relu(self.dropout(self.fc1(x)))
    x = self.fc2(x)
    return x

  def currentDevice(self) :
    return self.dummyParam.device

  def initWeights(self,m) :
    if type(m) == nn.Linear:
      torch.nn.init.xavier_uniform_(m.weight)
      m.bias.data.fill_(0.01)

  def extractFeatures(self, dicts, config) :
    return Features.extractColsFeatures(dicts, config, self.featureFunction, self.columns)

################################################################################