''' Unit tests: resolver. '''
import unittest
from typing import cast

from cctext import (
    EntityReference, TermContext, Entity, SyntacticReference,
    Resolver, ResolvedReference, Position,
    resolve_entity, resolve_syntactic
)

class TestResolver(unittest.TestCase):
    '''Test reference Resolver.'''
    def setUp(self):
        self.context = cast(TermContext, {})
        self.context['X1'] = Entity('X1', 'человек')
        self.resolver = Resolver(self.context)

    def test_resolve_entity(self):
        self.assertEqual(resolve_entity(EntityReference('X1', ''), self.context), 'человек')
        self.assertEqual(resolve_entity(EntityReference('X1', 'plur'), self.context), 'люди')
        self.assertEqual(resolve_entity(EntityReference('X1', 'invalid'), self.context), '!Неизвестная граммема: invalid!')
        self.assertEqual(resolve_entity(EntityReference('X123', 'plur'), self.context), '!Неизвестная сущность: X123!')

    def test_resolve_syntactic(self):
        ref = ResolvedReference(ref=EntityReference('X1', 'sing,datv'), resolved='человеку')
        allrefs = [ref, ref, ref, ref]
        self.assertEqual(resolve_syntactic(SyntacticReference(text='умный', referal_offset=-1), 0, allrefs), '!Некорректное смещение: -1!')
        self.assertEqual(resolve_syntactic(SyntacticReference(text='умный', referal_offset=1), 3, allrefs), '!Некорректное смещение: 1!')
        self.assertEqual(resolve_syntactic(SyntacticReference(text='умный', referal_offset=1), 0, allrefs), 'умному')
        self.assertEqual(resolve_syntactic(SyntacticReference(text='умный', referal_offset=2), 0, allrefs), 'умному')
        self.assertEqual(resolve_syntactic(SyntacticReference(text='умный', referal_offset=3), 0, allrefs), 'умному')
        self.assertEqual(resolve_syntactic(SyntacticReference(text='умный', referal_offset=-1), 3, allrefs), 'умному')
        self.assertEqual(resolve_syntactic(SyntacticReference(text='умный', referal_offset=-2), 3, allrefs), 'умному')
        self.assertEqual(resolve_syntactic(SyntacticReference(text='умный', referal_offset=-3), 3, allrefs), 'умному')

    def test_resolve_invalid(self):
        self.assertEqual(self.resolver.resolve(''), '')
        self.assertEqual(len(self.resolver.refs), 0)

        self.assertEqual(self.resolver.resolve('simple text'), 'simple text')
        self.assertEqual(len(self.resolver.refs), 0)

        self.assertEqual(self.resolver.resolve('simple @{unparsable ref} text'), 'simple @{unparsable ref} text')
        self.assertEqual(len(self.resolver.refs), 0)

    def test_resolve_single(self):
        self.assertEqual(self.resolver.resolve('просто @{-1|умный} текст'), 'просто !Некорректное смещение: -1! текст')
        self.assertEqual(len(self.resolver.refs), 1)
        self.assertEqual(self.resolver.refs[0].pos_input, Position(7, 18))
        self.assertEqual(self.resolver.refs[0].pos_output, Position(7, 34))

        self.assertEqual(self.resolver.resolve('просто @{X123|sing,nomn} текст'), 'просто !Неизвестная сущность: X123! текст')
        self.assertEqual(len(self.resolver.refs), 1)
        self.assertEqual(self.resolver.refs[0].pos_input, Position(7, 24))
        self.assertEqual(self.resolver.refs[0].pos_output, Position(7, 35))

        self.assertEqual(self.resolver.resolve('@{X1|sing,nomn}'), 'человек')
        self.assertEqual(len(self.resolver.refs), 1)
        self.assertEqual(self.resolver.refs[0].pos_input, Position(0, 15))
        self.assertEqual(self.resolver.refs[0].pos_output, Position(0, 7))

        self.assertEqual(self.resolver.resolve('просто @{X1|sing,nomn} текст'), 'просто человек текст')
        self.assertEqual(len(self.resolver.refs), 1)
        self.assertEqual(self.resolver.refs[0].pos_input, Position(7, 22))
        self.assertEqual(self.resolver.refs[0].pos_output, Position(7, 14))

    def test_resolve_multiple(self):
        input =  '@{X1|sing,datv} @{-1|умный} @{X1|plur} завидуют'
        self.assertEqual(self.resolver.resolve(input), 'человеку умному люди завидуют')
        self.assertEqual(len(self.resolver.refs), 3)
        self.assertEqual(self.resolver.refs[0].pos_input, Position(0, 15))
        self.assertEqual(self.resolver.refs[0].pos_output, Position(0, 8))
        self.assertEqual(self.resolver.refs[1].pos_input, Position(16, 27))
        self.assertEqual(self.resolver.refs[1].pos_output, Position(9, 15))
        self.assertEqual(self.resolver.refs[2].pos_input, Position(28, 38))
        self.assertEqual(self.resolver.refs[2].pos_output, Position(16, 20))