import unittest
from typing import List

from data_import.pipeline import builders
from data_import.pipeline.data import TextData
from data_import.pipeline.exceptions import FileParseException
from data_import.pipeline.labels import CategoryLabel, SpanLabel


class TestColumnBuilder(unittest.TestCase):

    def assert_record(self, actual, expected):
        self.assertEqual(actual.data.text, expected['data'])
        self.assertEqual(actual.label, expected['label'])

    def create_record(self, row, data_column: builders.DataColumn, label_columns: List[builders.LabelColumn]):
        builder = builders.ColumnBuilder(
            data_column=data_column,
            label_columns=label_columns
        )
        return builder.build(row, filename='', line_num=1)

    def test_can_load_default_column_names(self):
        row = {'text': 'Text', 'label': 'Label'}
        data_column = builders.DataColumn('text', TextData)
        label_columns = [builders.LabelColumn('label', CategoryLabel)]
        actual = self.create_record(row, data_column, label_columns)
        expected = {'data': 'Text', 'label': [{'label': 'Label'}]}
        self.assert_record(actual, expected)

    def test_can_specify_any_column_names(self):
        row = {'body': 'Text', 'star': 5}
        data_column = builders.DataColumn('body', TextData)
        label_columns = [builders.LabelColumn('star', CategoryLabel)]
        actual = self.create_record(row, data_column, label_columns)
        expected = {'data': 'Text', 'label': [{'label': '5'}]}
        self.assert_record(actual, expected)

    def test_can_load_only_text_column(self):
        row = {'text': 'Text', 'label': None}
        data_column = builders.DataColumn('text', TextData)
        label_columns = [builders.LabelColumn('label', CategoryLabel)]
        actual = self.create_record(row, data_column, label_columns)
        expected = {'data': 'Text', 'label': []}
        self.assert_record(actual, expected)

    def test_denies_no_data_column(self):
        row = {'label': 'Label'}
        data_column = builders.DataColumn('text', TextData)
        label_columns = [builders.LabelColumn('label', CategoryLabel)]
        with self.assertRaises(FileParseException):
            self.create_record(row, data_column, label_columns)

    def test_denies_empty_text(self):
        row = {'text': '', 'label': 'Label'}
        data_column = builders.DataColumn('text', TextData)
        label_columns = [builders.LabelColumn('label', CategoryLabel)]
        with self.assertRaises(FileParseException):
            self.create_record(row, data_column, label_columns)

    def test_can_load_int_as_text(self):
        row = {'text': 5, 'label': 'Label'}
        data_column = builders.DataColumn('text', TextData)
        label_columns = [builders.LabelColumn('label', CategoryLabel)]
        actual = self.create_record(row, data_column, label_columns)
        expected = {'data': '5', 'label': [{'label': 'Label'}]}
        self.assert_record(actual, expected)

    def test_can_build_multiple_labels(self):
        row = {'text': 'Text', 'cats': ['Label'], 'entities': [(0, 1, 'LOC')]}
        data_column = builders.DataColumn('text', TextData)
        label_columns = [
            builders.LabelColumn('cats', CategoryLabel),
            builders.LabelColumn('entities', SpanLabel)
        ]
        actual = self.create_record(row, data_column, label_columns)
        expected = {
            'data': 'Text',
            'label': [
                {'label': 'Label'},
                {'label': 'LOC', 'start_offset': 0, 'end_offset': 1}
            ]
        }
        self.assert_record(actual, expected)