#!/usr/bin/python
# -*- coding: utf-8 -*-
# \file CrossValidationGenerator.py
# \brief TODO
# \author Florent Guiotte <florent.guiotte@gmail.com>
# \version 0.1
# \date 28 Mar 2018
#
# TODO details

import numpy as np

class CVG_legacy:
    def __init__(self, attributes, ground_truth, n_test=2, order_dim=0):
        self._order        = order_dim
        self._ntests       = n_test
        self._actual_ntest = 0
        self._size         = attributes.shape[order_dim]
        self._att          = attributes
        self._gt           = ground_truth
        
        if attributes.shape[0] != ground_truth.shape[0] or \
           attributes.shape[1] != ground_truth.shape[1] :
                raise ValueError('attributes and ground_truth must have the same 2D shape')
        
    def __iter__(self):
        return self
    
    def __next__(self):
        if self._actual_ntest == self._ntests:
            raise StopIteration
        
        step = self._size / self._ntests
        train_filter = (np.arange(self._size) - step * self._actual_ntest) % self._size < step
        
        if self._order == 0:
            Xtrain = self._att[train_filter].reshape(-1, self._att.shape[2])
            Xtest  = self._att[train_filter == False].reshape(-1, self._att.shape[2])
            Ytrain = self._gt[train_filter].reshape(-1)
            Ytest  = self._gt[train_filter == False].reshape(-1)
        else:
            Xtrain = self._att[:,train_filter].reshape(-1, self._att.shape[2])
            Xtest  = self._att[:,train_filter == False].reshape(-1, self._att.shape[2])
            Ytrain = self._gt[:,train_filter].reshape(-1)
            Ytest  = self._gt[:,train_filter == False].reshape(-1)

        
        self._actual_ntest += 1
        
        return (Xtrain, Xtest, Ytrain, Ytest, train_filter)

class APsCVG:
    """Cross Validation Generator for Attribute Profiles Descriptors"""
    def __init__(self, ground_truth, attributes, cv_count=5, label_ignore=None):
        d
        
        
        return xtrain, xtest, ytrain, ytest, test_index