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''' Tests recoder class '''

import numpy as np

from ..volumeutils import Recoder, DtypeMapper, native_code, swapped_code

from nose.tools import assert_equal, assert_raises, assert_true, assert_false

def test_recoder():
    # simplest case, no aliases
    codes = ((1,),(2,))
    rc = Recoder(codes)
    yield assert_equal, rc.code[1], 1
    yield assert_equal, rc.code[2], 2
    yield assert_raises, KeyError, rc.code.__getitem__, 3
    # with explicit name for code
    rc = Recoder(codes, ['code1'])
    yield assert_raises, AttributeError, rc.__getattribute__, 'code'
    yield assert_equal, rc.code1[1], 1
    yield assert_equal, rc.code1[2], 2
    # code and label
    codes = ((1,'one'), (2,'two'))
    rc = Recoder(codes) # just with implicit alias
    yield assert_equal, rc.code[1], 1
    yield assert_equal, rc.code[2], 2
    yield assert_raises, KeyError, rc.code.__getitem__, 3
    yield assert_equal, rc.code['one'], 1
    yield assert_equal, rc.code['two'], 2
    yield assert_raises, KeyError, rc.code.__getitem__, 'three'
    yield assert_raises, AttributeError, rc.__getattribute__, 'label'
    rc = Recoder(codes, ['code1', 'label']) # with explicit column names
    yield assert_raises, AttributeError, rc.__getattribute__, 'code'
    yield assert_equal, rc.code1[1], 1
    yield assert_equal, rc.code1['one'], 1
    yield assert_equal, rc.label[1], 'one'
    yield assert_equal, rc.label['one'], 'one'
    # code, label, aliases
    codes = ((1,'one','1','first'), (2,'two'))
    rc = Recoder(codes) # just with implicit alias
    yield assert_equal, rc.code[1], 1
    yield assert_equal, rc.code['one'], 1
    yield assert_equal, rc.code['first'], 1
    rc = Recoder(codes, ['code1', 'label']) # with explicit column names
    yield assert_equal, rc.code1[1], 1
    yield assert_equal, rc.code1['first'], 1
    yield assert_equal, rc.label[1], 'one'
    yield assert_equal, rc.label['first'], 'one'
    # Don't allow funny names
    yield assert_raises, KeyError, Recoder, codes, ['field1']


def test_custom_dicter():
    # Allow custom dict-like object in constructor
    class MyDict(object):
        def __init__(self):
            self._keys = []
        def __setitem__(self, key, value):
            self._keys.append(key)
        def __getitem__(self, key):
            if key in self._keys:
                return 'spam'
            return 'eggs'
        def keys(self):
            return ['some', 'keys']
        def values(self):
            return ['funny', 'list']
    # code, label, aliases
    codes = ((1,'one','1','first'), (2,'two'))
    rc = Recoder(codes, map_maker=MyDict)
    yield assert_equal, rc.code[1], 'spam'
    yield assert_equal, rc.code['one'], 'spam'
    yield assert_equal, rc.code['first'], 'spam'
    yield assert_equal, rc.code['bizarre'], 'eggs'
    yield assert_equal, rc.value_set(), set(['funny', 'list'])
    yield assert_equal, list(rc.keys()), ['some', 'keys']


def test_add_codes():
    codes = ((1,'one','1','first'), (2,'two'))
    rc = Recoder(codes)
    yield assert_equal, rc.code['two'], 2
    yield assert_raises, KeyError, rc.code.__getitem__, 'three'
    rc.add_codes(((3, 'three'), (1, 'number 1')))
    yield assert_equal, rc.code['three'], 3
    yield assert_equal, rc.code['number 1'], 1


def test_sugar():
    # Syntactic sugar for recoder class
    codes = ((1,'one','1','first'), (2,'two'))
    rc = Recoder(codes)
    # Field1 is synonym for first named dict
    yield assert_equal, rc.code, rc.field1
    rc = Recoder(codes, fields=('code1', 'label'))
    yield assert_equal, rc.code1, rc.field1
    # Direct key access identical to key access for first named
    yield assert_equal, rc[1], rc.field1[1]
    yield assert_equal, rc['two'], rc.field1['two']
    # keys gets all keys
    yield assert_equal, set(rc.keys()), set((1,'one','1','first',2,'two'))
    # value_set gets set of values from first column
    yield assert_equal, rc.value_set(), set((1, 2))
    # or named column if given
    yield assert_equal, rc.value_set('label'), set(('one', 'two'))
    # "in" works for values in and outside the set
    yield assert_true, 'one' in rc
    yield assert_false, 'three' in rc


def test_dtmapper():
    # dict-like that will lookup on dtypes, even if they don't hash properly
    d = DtypeMapper()
    assert_raises(KeyError, d.__getitem__, 1)
    d[1] = 'something'
    assert_equal(d[1], 'something')
    assert_equal(list(d.keys()), [1])
    assert_equal(list(d.values()), ['something'])
    intp_dt = np.dtype('intp')
    if intp_dt == np.dtype('int32'):
        canonical_dt = np.dtype('int32')
    elif intp_dt == np.dtype('int64'):
        canonical_dt = np.dtype('int64')
    else:
        raise RuntimeError('Can I borrow your computer?')
    native_dt = canonical_dt.newbyteorder('=')
    explicit_dt = canonical_dt.newbyteorder(native_code)
    d[canonical_dt] = 'spam'
    assert_equal(d[canonical_dt], 'spam')
    assert_equal(d[native_dt], 'spam')
    assert_equal(d[explicit_dt], 'spam')
    # Test keys, values
    d = DtypeMapper()
    assert_equal(list(d.keys()), [])
    assert_equal(list(d.keys()), [])
    d[canonical_dt] = 'spam'
    assert_equal(list(d.keys()), [canonical_dt])
    assert_equal(list(d.values()), ['spam'])
    # With other byte order
    d = DtypeMapper()
    sw_dt = canonical_dt.newbyteorder(swapped_code)
    d[sw_dt] = 'spam'
    assert_raises(KeyError, d.__getitem__, canonical_dt)
    assert_equal(d[sw_dt], 'spam')
    sw_intp_dt = intp_dt.newbyteorder(swapped_code)
    assert_equal(d[sw_intp_dt], 'spam')


