# coding: utf-8
from __future__ import unicode_literals

from ..util import get_doc, get_cosine

import numpy
import pytest


@pytest.fixture
def vectors():
    return ("apple", [1, 2, 3], "orange", [-1, -2, -3])


@pytest.fixture()
def vocab(en_vocab, vectors):
    word1, vec1, word2, vec2 = vectors
    en_vocab.resize_vectors(3)
    lex1 = en_vocab[word1]
    lex2 = en_vocab[word2]
    lex1.vector = vec1
    lex2.vector = vec2
    return en_vocab


def test_vectors_similarity_LL(vocab, vectors):
    word1, vec1, word2, vec2 = vectors
    lex1 = vocab[word1]
    lex2 = vocab[word2]
    assert lex1.has_vector
    assert lex2.has_vector
    assert lex1.vector_norm != 0
    assert lex2.vector_norm != 0
    assert lex1.vector[0] != lex2.vector[0] and lex1.vector[1] != lex2.vector[1]
    assert numpy.isclose(lex1.similarity(lex2), get_cosine(vec1, vec2))
    assert numpy.isclose(lex2.similarity(lex2), lex1.similarity(lex1))


def test_vectors_similarity_TT(vocab, vectors):
    word1, vec1, word2, vec2 = vectors
    doc = get_doc(vocab, words=[word1, word2])
    assert doc[0].has_vector
    assert doc[1].has_vector
    assert doc[0].vector_norm != 0
    assert doc[1].vector_norm != 0
    assert doc[0].vector[0] != doc[1].vector[0] and doc[0].vector[1] != doc[1].vector[1]
    assert numpy.isclose(doc[0].similarity(doc[1]), get_cosine(vec1, vec2))
    assert numpy.isclose(doc[1].similarity(doc[0]), doc[0].similarity(doc[1]))


def test_vectors_similarity_TD(vocab, vectors):
    word1, vec1, word2, vec2 = vectors
    doc = get_doc(vocab, words=[word1, word2])
    assert doc.similarity(doc[0]) == doc[0].similarity(doc)


def test_vectors_similarity_DS(vocab, vectors):
    word1, vec1, word2, vec2 = vectors
    doc = get_doc(vocab, words=[word1, word2])
    assert doc.similarity(doc[:2]) == doc[:2].similarity(doc)


def test_vectors_similarity_TS(vocab, vectors):
    word1, vec1, word2, vec2 = vectors
    doc = get_doc(vocab, words=[word1, word2])
    assert doc[:2].similarity(doc[0]) == doc[0].similarity(doc[:2])