# coding: utf-8
from __future__ import unicode_literals

import pytest
from spacy._align import align, multi_align


@pytest.mark.parametrize('string1,string2,cost', [
    ('hello', 'hell', 1),
    ('rat', 'cat', 1),
    ('rat', 'rat', 0),
    ('rat', 'catsie', 4),
    ('t', 'catsie', 5),
])
def test_align_costs(string1, string2, cost):
    output_cost, i2j, j2i, matrix = align(string1, string2)
    assert output_cost == cost


@pytest.mark.parametrize('string1,string2,i2j', [
    ('hello', 'hell', [0,1,2,3,-1]),
    ('rat', 'cat', [0,1,2]),
    ('rat', 'rat', [0,1,2]),
    ('rat', 'catsie', [0,1,2]),
    ('t', 'catsie', [2]),
])
def test_align_i2j(string1, string2, i2j):
    output_cost, output_i2j, j2i, matrix = align(string1, string2)
    assert list(output_i2j) == i2j


@pytest.mark.parametrize('string1,string2,j2i', [
    ('hello', 'hell', [0,1,2,3]),
    ('rat', 'cat', [0,1,2]),
    ('rat', 'rat', [0,1,2]),
    ('rat', 'catsie', [0,1,2, -1, -1, -1]),
    ('t', 'catsie', [-1, -1, 0, -1, -1, -1]),
])
def test_align_i2j(string1, string2, j2i):
    output_cost, output_i2j, output_j2i, matrix = align(string1, string2)
    assert list(output_j2i) == j2i

def test_align_strings():
    words1 = ['hello', 'this', 'is', 'test!']
    words2 = ['hellothis', 'is', 'test', '!']
    cost, i2j, j2i, matrix = align(words1, words2)
    assert cost == 4
    assert list(i2j) == [-1, -1, 1, -1]
    assert list(j2i) == [-1, 2, -1, -1]

def test_align_many_to_one():
    words1 = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h']
    words2 = ['ab', 'bc', 'e', 'fg', 'h']
    cost, i2j, j2i, matrix = align(words1, words2)
    assert list(i2j) == [-1, -1, -1, -1, 2, -1, -1, 4]
    lengths1 = [len(w) for w in words1]
    lengths2 = [len(w) for w in words2]
    i2j_multi, j2i_multi = multi_align(i2j, j2i, lengths1, lengths2)
    assert i2j_multi[0] == 0
    assert i2j_multi[1] == 0
    assert i2j_multi[2] == 1
    assert i2j_multi[3] == 1
    assert i2j_multi[3] == 1
    assert i2j_multi[5] == 3
    assert i2j_multi[6] == 3

    assert j2i_multi[0] == 1
    assert j2i_multi[1] == 3