# coding: utf-8
from __future__ import unicode_literals

from ..util import get_doc, apply_transition_sequence

import pytest


def test_parser_root(en_tokenizer):
    text = "i don't have other assistance"
    heads = [3, 2, 1, 0, 1, -2]
    deps = ['nsubj', 'aux', 'neg', 'ROOT', 'amod', 'dobj']
    tokens = en_tokenizer(text)
    doc = get_doc(tokens.vocab, [t.text for t in tokens], heads=heads, deps=deps)
    for t in doc:
        assert t.dep != 0, t.text


@pytest.mark.parametrize('text', ["Hello"])
def test_parser_parse_one_word_sentence(en_tokenizer, en_parser, text):
    tokens = en_tokenizer(text)
    doc = get_doc(tokens.vocab, [t.text for t in tokens], heads=[0], deps=['ROOT'])

    assert len(doc) == 1
    with en_parser.step_through(doc) as _:
        pass
    assert doc[0].dep != 0


def test_parser_arc_eager_finalize_state(en_tokenizer, en_parser):
    text = "a b c d e"

    # right branching
    transition = ['R-nsubj', 'D', 'R-nsubj', 'R-nsubj', 'D', 'R-ROOT']
    tokens = en_tokenizer(text)
    apply_transition_sequence(en_parser, tokens, transition)

    assert tokens[0].n_lefts == 0
    assert tokens[0].n_rights == 2
    assert tokens[0].left_edge.i == 0
    assert tokens[0].right_edge.i == 4
    assert tokens[0].head.i == 0

    assert tokens[1].n_lefts == 0
    assert tokens[1].n_rights == 0
    assert tokens[1].left_edge.i == 1
    assert tokens[1].right_edge.i == 1
    assert tokens[1].head.i == 0

    assert tokens[2].n_lefts == 0
    assert tokens[2].n_rights == 2
    assert tokens[2].left_edge.i == 2
    assert tokens[2].right_edge.i == 4
    assert tokens[2].head.i == 0

    assert tokens[3].n_lefts == 0
    assert tokens[3].n_rights == 0
    assert tokens[3].left_edge.i == 3
    assert tokens[3].right_edge.i == 3
    assert tokens[3].head.i == 2

    assert tokens[4].n_lefts == 0
    assert tokens[4].n_rights == 0
    assert tokens[4].left_edge.i == 4
    assert tokens[4].right_edge.i == 4
    assert tokens[4].head.i == 2

    # left branching
    transition = ['S', 'S', 'S', 'L-nsubj','L-nsubj','L-nsubj', 'L-nsubj']
    tokens = en_tokenizer(text)
    apply_transition_sequence(en_parser, tokens, transition)

    assert tokens[0].n_lefts == 0
    assert tokens[0].n_rights == 0
    assert tokens[0].left_edge.i == 0
    assert tokens[0].right_edge.i == 0
    assert tokens[0].head.i == 4

    assert tokens[1].n_lefts == 0
    assert tokens[1].n_rights == 0
    assert tokens[1].left_edge.i == 1
    assert tokens[1].right_edge.i == 1
    assert tokens[1].head.i == 4

    assert tokens[2].n_lefts == 0
    assert tokens[2].n_rights == 0
    assert tokens[2].left_edge.i == 2
    assert tokens[2].right_edge.i == 2
    assert tokens[2].head.i == 4

    assert tokens[3].n_lefts == 0
    assert tokens[3].n_rights == 0
    assert tokens[3].left_edge.i == 3
    assert tokens[3].right_edge.i == 3
    assert tokens[3].head.i == 4

    assert tokens[4].n_lefts == 4
    assert tokens[4].n_rights == 0
    assert tokens[4].left_edge.i == 0
    assert tokens[4].right_edge.i == 4
    assert tokens[4].head.i == 4