import keras
from keras.engine import Input, Model
from keras.layers import Embedding, Conv1D, GlobalMaxPooling1D, Dense, Dropout, TimeDistributed, MaxPool1D


def get_embedding(vocab_size, embedding_size, input_length,
                  filter_size, kernel_size, hidden_dims, drop_out=0.5):
    x = y = Input(shape=(input_length,))
    y = Embedding(input_dim=vocab_size, output_dim=embedding_size)(y)
    y = Conv1D(filter_size, kernel_size=5, activation='relu')(y)
    y = MaxPool1D(pool_size=3, strides=1)(y)
    y = Conv1D(filter_size, kernel_size=3, activation='relu')(y)
    y = MaxPool1D(pool_size=3, strides=1)(y)
    y = Conv1D(filter_size, kernel_size=3, activation='relu')(y)
    y = GlobalMaxPooling1D()(y)
    y = Dropout(drop_out)(y)
    y = Dense(hidden_dims, activation="relu")(y)
    return Model(x, y)


def get_model(cnnDropout, flow_features, domain_features, window_size, domain_length, cnn_dims, kernel_size,
              dense_dim, cnn):
    ipt_domains = Input(shape=(window_size, domain_length), name="ipt_domains")
    encoded = TimeDistributed(cnn)(ipt_domains)
    ipt_flows = Input(shape=(window_size, flow_features), name="ipt_flows")
    merged = keras.layers.concatenate([encoded, ipt_flows], -1)
    # CNN processing a small slides of flow windows
    y = Conv1D(filters=cnn_dims, kernel_size=kernel_size, activation='relu',
               input_shape=(window_size, domain_features + flow_features))(merged)
    y = MaxPool1D(pool_size=3, strides=1)(y)
    y = Conv1D(filters=cnn_dims, kernel_size=kernel_size, activation='relu')(y)
    y = MaxPool1D(pool_size=3, strides=1)(y)
    y = Conv1D(filters=cnn_dims, kernel_size=kernel_size, activation='relu')(y)
    # remove temporal dimension by global max pooling
    y = GlobalMaxPooling1D()(y)
    y = Dropout(cnnDropout)(y)
    y = Dense(dense_dim, activation='relu')(y)
    y = Dense(dense_dim // 2, activation='relu')(y)
    y1 = Dense(2, activation='softmax', name="client")(y)
    y2 = Dense(2, activation='softmax', name="server")(y)

    return Model(inputs=[ipt_domains, ipt_flows], outputs=(y1, y2))