#!/bin/env python
from dataset import *
from math import *
import numpy, unittest, sys
from misc import *

def have_raised(to_eval, **var):
    have_thrown = False
    try:
        eval(to_eval)
    except :
        have_thrown = True
    return have_thrown

def have_raised2(f, *args, **kwargs):
    have_thrown = False
    try:
        f(*args, **kwargs)
    except :
        have_thrown = True
    return have_thrown

def test1():
    print "test1"
    global a,ds
    a = numpy.random.rand(10,4)
    print a
    ds = ArrayDataSet(a,{'x':slice(3),'y':3,'z':[0,2]})
    print "len(ds)=",len(ds)
    assert(len(ds)==10)
    print "example 0 = ",ds[0]
#    assert
    print "x=",ds["x"]
    print "x|y"
    for x,y in ds("x","y"):
        print x,y
    minibatch_iterator = ds.minibatches(fieldnames=['z','y'],n_batches=1,minibatch_size=3,offset=4)
    minibatch = minibatch_iterator.__iter__().next()
    print "minibatch=",minibatch
    for var in minibatch:
        print "var=",var
    print "take a slice and look at field y",ds[1:6:2]["y"]

    del a,ds,x,y,minibatch_iterator,minibatch,var

def test_iterate_over_examples(array,ds):
#not in doc!!!
    i=0
    for example in range(len(ds)):
        wanted = array[example][:3]
        returned = ds[example]['x']
        if (wanted != returned).all():
            print 'returned:', returned
            print 'wanted:', wanted
        assert (ds[example]['x']==array[example][:3]).all()
        assert ds[example]['y']==array[example][3]
        assert (ds[example]['z']==array[example][[0,2]]).all()
        i+=1
    assert i==len(ds)
    del example,i

#     - for example in dataset:
    i=0
    for example in ds:
        assert len(example)==3
        assert (example['x']==array[i][:3]).all()
        assert example['y']==array[i][3]
        assert (example['z']==array[i][0:3:2]).all()
        assert (numpy.append(example['x'],example['y'])==array[i]).all()
        i+=1
    assert i==len(ds)
    del example,i

#     - for val1,val2,... in dataset:
    i=0
    for x,y,z in ds:
        assert (x==array[i][:3]).all()
        assert y==array[i][3]
        assert (z==array[i][0:3:2]).all()
        assert (numpy.append(x,y)==array[i]).all()
        i+=1
    assert i==len(ds)
    del x,y,z,i

#     - for example in dataset(field1, field2,field3, ...):
    i=0
    for example in ds('x','y','z'):
        assert len(example)==3
        assert (example['x']==array[i][:3]).all()
        assert example['y']==array[i][3]
        assert (example['z']==array[i][0:3:2]).all()
        assert (numpy.append(example['x'],example['y'])==array[i]).all()
        i+=1
    assert i==len(ds)
    del example,i
    i=0
    for example in ds('y','x'):
        assert len(example)==2
        assert (example['x']==array[i][:3]).all()
        assert example['y']==array[i][3]
        assert (numpy.append(example['x'],example['y'])==array[i]).all()
        i+=1
    assert i==len(ds)
    del example,i

#     - for val1,val2,val3 in dataset(field1, field2,field3):
    i=0
    for x,y,z in ds('x','y','z'):
        assert (x==array[i][:3]).all()
        assert y==array[i][3]
        assert (z==array[i][0:3:2]).all()
        assert (numpy.append(x,y)==array[i]).all()
        i+=1
    assert i==len(ds)
    del x,y,z,i
    i=0
    for y,x in ds('y','x',):
        assert (x==array[i][:3]).all()
        assert y==array[i][3]
        assert (numpy.append(x,y)==array[i]).all()
        i+=1
    assert i==len(ds)
    del x,y,i

    def test_minibatch_size(minibatch,minibatch_size,len_ds,nb_field,nb_iter_finished):
        ##full minibatch or the last minibatch
        for idx in range(nb_field):
            test_minibatch_field_size(minibatch[idx],minibatch_size,len_ds,nb_iter_finished)
        del idx
    def test_minibatch_field_size(minibatch_field,minibatch_size,len_ds,nb_iter_finished):
        assert len(minibatch_field)==minibatch_size or ((nb_iter_finished*minibatch_size+len(minibatch_field))==len_ds and len(minibatch_field)<minibatch_size)

#     - for minibatch in dataset.minibatches([field1, field2, ...],minibatch_size=N):
    i=0
    mi=0
    m=ds.minibatches(['x','z'], minibatch_size=3)
    assert isinstance(m,DataSet.MinibatchWrapAroundIterator)
    for minibatch in m:
        assert isinstance(minibatch,DataSetFields)
        assert len(minibatch)==2
        test_minibatch_size(minibatch,m.minibatch_size,len(ds),2,mi)
        if type(ds)==ArrayDataSet:
            assert (minibatch[0][:,::2]==minibatch[1]).all()
        else:
            for j in xrange(len(minibatch[0])):
                (minibatch[0][j][::2]==minibatch[1][j]).all()
        mi+=1
        i+=len(minibatch[0])
    assert i==len(ds)
    assert mi==4
    del minibatch,i,m,mi

    i=0
    mi=0
    m=ds.minibatches(['x','y'], minibatch_size=3)
    assert isinstance(m,DataSet.MinibatchWrapAroundIterator)
    for minibatch in m:
        assert len(minibatch)==2
        test_minibatch_size(minibatch,m.minibatch_size,len(ds),2,mi)
        mi+=1
        for id in range(len(minibatch[0])):
            assert (numpy.append(minibatch[0][id],minibatch[1][id])==array[i]).all()
            i+=1
    assert i==len(ds)
    assert mi==4
    del minibatch,i,id,m,mi

#     - for mini1,mini2,mini3 in dataset.minibatches([field1, field2, field3], minibatch_size=N):
    i=0
    mi=0
    m=ds.minibatches(['x','z'], minibatch_size=3)
    assert isinstance(m,DataSet.MinibatchWrapAroundIterator)
    for x,z in m:
        test_minibatch_field_size(x,m.minibatch_size,len(ds),mi)
        test_minibatch_field_size(z,m.minibatch_size,len(ds),mi)
        for id in range(len(x)):
            assert (x[id][::2]==z[id]).all()
            i+=1
        mi+=1
    assert i==len(ds)
    assert mi==4
    del x,z,i,m,mi
    i=0
    mi=0
    m=ds.minibatches(['x','y'], minibatch_size=3)
    for x,y in m:
        test_minibatch_field_size(x,m.minibatch_size,len(ds),mi)
        test_minibatch_field_size(y,m.minibatch_size,len(ds),mi)
        mi+=1
        for id in range(len(x)):
            assert (numpy.append(x[id],y[id])==array[i]).all()
            i+=1
    assert i==len(ds)
    assert mi==4
    del x,y,i,id,m,mi

#not in doc
    i=0
    m=ds.minibatches(['x','y'],n_batches=1,minibatch_size=3,offset=4)
    assert isinstance(m,DataSet.MinibatchWrapAroundIterator)
    for x,y in m:
        assert len(x)==m.minibatch_size
        assert len(y)==m.minibatch_size
        for id in range(m.minibatch_size):
            assert (numpy.append(x[id],y[id])==array[i+4]).all()
            i+=1
    assert i==m.n_batches*m.minibatch_size
    del x,y,i,id,m

    i=0
    m=ds.minibatches(['x','y'],n_batches=2,minibatch_size=3,offset=4)
    assert isinstance(m,DataSet.MinibatchWrapAroundIterator)
    for x,y in m:
        assert len(x)==m.minibatch_size
        assert len(y)==m.minibatch_size
        for id in range(m.minibatch_size):
            assert (numpy.append(x[id],y[id])==array[i+4]).all()
            i+=1
    assert i==m.n_batches*m.minibatch_size
    del x,y,i,id,m

    i=0
    m=ds.minibatches(['x','y'],n_batches=20,minibatch_size=3,offset=4)
    assert isinstance(m,DataSet.MinibatchWrapAroundIterator)
    for x,y in m:
        assert len(x)==m.minibatch_size
        assert len(y)==m.minibatch_size
        for id in range(m.minibatch_size):
            assert (numpy.append(x[id],y[id])==array[(i+4)%array.shape[0]]).all()
            i+=1
    assert i==m.n_batches*m.minibatch_size
    del x,y,i,id

    assert not have_raised2(ds.minibatches,['x','y'],n_batches=1,minibatch_size=len(array)+1,offset=0)
    assert not have_raised2(ds.minibatches,['x','y'],n_batches=1,minibatch_size=len(array),offset=0)

def test_ds_iterator(array,iterator1,iterator2,iterator3):
    l=len(iterator1)
    i=0
    for x,y in iterator1:
        assert (x==array[i][:3]).all()
        assert y==array[i][3]
        assert (numpy.append(x,y)==array[i]).all()
        i+=1
    assert i==l
    i=0
    for y,z in iterator2:
        assert y==array[i][3]
        assert (z==array[i][0:3:2]).all()
        i+=1
    assert i==l
    i=0
    for x,y,z in iterator3:
        assert (x==array[i][:3]).all()
        assert y==array[i][3]
        assert (z==array[i][0:3:2]).all()
        assert (numpy.append(x,y)==array[i]).all()
        i+=1
    assert i==l

def test_getitem(array,ds):
    def test_ds(orig,ds,index):
        i=0
        assert len(ds)==len(index)
        for x,z,y in ds('x','z','y'):
            assert (orig[index[i]]['x']==array[index[i]][:3]).all()
            assert (orig[index[i]]['x']==x).all()
            assert orig[index[i]]['y']==array[index[i]][3]
            assert orig[index[i]]['y']==y
            assert (orig[index[i]]['z']==array[index[i]][0:3:2]).all()
            assert (orig[index[i]]['z']==z).all()
            i+=1
        del i
        ds[0]
        if len(ds)>2:
            ds[:1]
            ds[1:1]
            ds[1:1:1]
        if len(ds)>5:
            ds[[1,2,3]]
        for x in ds:
            pass

#ds[:n] returns a dataset with the n first examples.
    ds2=ds[:3]
    assert isinstance(ds2,DataSet)
    test_ds(ds,ds2,index=[0,1,2])
    del ds2

#ds[i1:i2:s]# returns a ds with the examples i1,i1+s,...i2-s.
    ds2=ds[1:7:2]
    assert isinstance(ds2,DataSet)
    test_ds(ds,ds2,[1,3,5])
    del ds2

#ds[i]
    ds2=ds[5]
    assert isinstance(ds2,Example)
    assert have_raised("var['ds']["+str(len(ds))+"]",ds=ds)  # index not defined
    assert not have_raised("var['ds']["+str(len(ds)-1)+"]",ds=ds)
    del ds2

#ds[[i1,i2,...in]]# returns a ds with examples i1,i2,...in.
    ds2=ds[[4,7,2,8]]
    assert isinstance(ds2,DataSet)
    test_ds(ds,ds2,[4,7,2,8])
    del ds2

    #ds.<property># returns the value of a property associated with
      #the name <property>. The following properties should be supported:
      #    - 'description': a textual description or name for the ds
      #    - 'fieldtypes': a list of types (one per field)

    #* ds1 | ds2 | ds3 == ds.hstack([ds1,ds2,ds3])#????
        #assert hstack([ds('x','y'),ds('z')])==ds
        #hstack([ds('z','y'),ds('x')])==ds
    assert have_raised2(hstack,[ds('x'),ds('x')])
    assert have_raised2(hstack,[ds('y','x'),ds('x')])
    assert not have_raised2(hstack,[ds('x'),ds('y')])
        
    #        i=0
    #        for example in hstack([ds('x'),ds('y'),ds('z')]):
    #            example==ds[i]
    #            i+=1 
    #        del i,example
    #* ds1 & ds2 & ds3 == ds.vstack([ds1,ds2,ds3])#????

def test_fields_fct(ds):
    #@todo, fill correctly
    assert len(ds.fields())==3
    i=0
    v=0
    for field in ds.fields():
        for field_value in field: # iterate over the values associated to that field for all the ds examples
            v+=1
        i+=1
    assert i==3
    assert v==3*10
    del i,v
    
    i=0
    v=0
    for field in ds('x','z').fields():
        i+=1
        for val in field:
            v+=1
    assert i==2
    assert v==2*10
    del i,v
    
    i=0
    v=0
    for field in ds.fields('x','y'):
        i+=1
        for val in field:
            v+=1
    assert i==2
    assert v==2*10
    del i,v
    
    i=0
    v=0
    for field_examples in ds.fields():
        for example_value in field_examples:
            v+=1
        i+=1
    assert i==3
    assert v==3*10
    del i,v
    
    assert ds == ds.fields().examples()
    assert len(ds('x','y').fields()) == 2
    assert len(ds('x','z').fields()) == 2
    assert len(ds('y').fields()) == 1

    del field
def test_all(array,ds):
    assert len(ds)==10

    test_iterate_over_examples(array, ds)
    test_getitem(array, ds)
    test_ds_iterator(array,ds('x','y'),ds('y','z'),ds('x','y','z'))
    test_fields_fct(ds)

class T_DataSet(unittest.TestCase):
    def test_ArrayDataSet(self):
        #don't test stream
        #tested only with float value
        #don't always test with y
        #don't test missing value
        #don't test with tuple
        #don't test proterties
        a2 = numpy.random.rand(10,4)
        ds = ArrayDataSet(a2,{'x':slice(3),'y':3,'z':[0,2]})###???tuple not tested
        ds = ArrayDataSet(a2,Example(['x','y','z'],[slice(3),3,[0,2]]))###???tuple not tested
        #assert ds==a? should this work?

        test_all(a2,ds)

        del a2, ds

    def test_CachedDataSet(self):
        a = numpy.random.rand(10,4)
        ds1 = ArrayDataSet(a,Example(['x','y','z'],[slice(3),3,[0,2]]))###???tuple not tested
        ds2 = CachedDataSet(ds1)
        ds3 = CachedDataSet(ds1,cache_all_upon_construction=True)

        test_all(a,ds2)
        test_all(a,ds3)

        del a,ds1,ds2,ds3


    def test_DataSetFields(self):
        raise NotImplementedError()

    def test_ApplyFunctionDataSet(self):
        a = numpy.random.rand(10,4)
        a2 = a+1
        ds1 = ArrayDataSet(a,Example(['x','y','z'],[slice(3),3,[0,2]]))###???tuple not tested

        ds2 = ApplyFunctionDataSet(ds1,lambda x,y,z: (x+1,y+1,z+1), ['x','y','z'],minibatch_mode=False)
        ds3 = ApplyFunctionDataSet(ds1,lambda x,y,z: (numpy.array(x)+1,numpy.array(y)+1,numpy.array(z)+1),
                                   ['x','y','z'],
                                   minibatch_mode=True)

        test_all(a2,ds2)
        test_all(a2,ds3)

        del a,ds1,ds2,ds3

    def test_FieldsSubsetDataSet(self):
        a = numpy.random.rand(10,4)
        ds = ArrayDataSet(a,Example(['x','y','z','w'],[slice(3),3,[0,2],0]))
        ds = FieldsSubsetDataSet(ds,['x','y','z'])

        test_all(a,ds)

        del a, ds

    def test_MultiLengthDataSet(self):
        class MultiLengthDataSet(DataSet):
            """ Dummy dataset, where one field is a ndarray of variables size. """
            def __len__(self) :
                return 100
            def fieldNames(self) :
                return 'input','target','name'
            def minibatches_nowrap(self,fieldnames,minibatch_size,n_batches,offset):
                class MultiLengthDataSetIterator(object):
                    def __init__(self,dataset,fieldnames,minibatch_size,n_batches,offset):
                        if fieldnames is None: fieldnames = dataset.fieldNames()
                        self.minibatch = Example(fieldnames,range(len(fieldnames)))
                        self.dataset, self.minibatch_size, self.current = dataset, minibatch_size, offset
                    def __iter__(self):
                            return self
                    def next(self):
                        for k in self.minibatch._names :
                            self.minibatch[k] = []
                            for ex in range(self.minibatch_size) :
                                if 'input' in self.minibatch._names:
                                    self.minibatch['input'].append( numpy.array( range(self.current + 1) ) )
                                if 'target' in self.minibatch._names:
                                    self.minibatch['target'].append( self.current % 2 )
                                if 'name' in self.minibatch._names:
                                    self.minibatch['name'].append( str(self.current) )
                                self.current += 1
                        return self.minibatch
                return MultiLengthDataSetIterator(self,fieldnames,minibatch_size,n_batches,offset)
        ds = MultiLengthDataSet()
        for k in range(len(ds)):
            x = ds[k]
        dsa = ApplyFunctionDataset(ds,lambda x,y,z: (x[-1],y*10,int(z)),['input','target','name'],minibatch_mode=True)
        # needs more testing using ds, dsa, dscache, ...
        raise NotImplementedError()

    def test_MinibatchDataSet(self):
        raise NotImplementedError()
    def test_HStackedDataSet(self):
        raise NotImplementedError()
    def test_VStackedDataSet(self):
        raise NotImplementedError()
    def test_ArrayFieldsDataSet(self):
        raise NotImplementedError()


if __name__=='__main__':
    if len(sys.argv)==2:
        if sys.argv[1]=="--debug":
            module = __import__("_test_dataset")
            tests = unittest.TestLoader().loadTestsFromModule(module)
            tests.debug()
        print "bad argument: only --debug is accepted"
    elif len(sys.argv)==1:
        unittest.main()
    else:
        print "bad argument: only --debug is accepted"