#!/usr/bin/env python
# coding: utf-8

# Copyright (c) Saga Inc.
# Distributed under the terms of the GPL License.

from copy import copy
from time import perf_counter
from typing import Any, Dict, List, Optional, Set, Tuple

import pandas as pd
from mitosheet.code_chunks.code_chunk import CodeChunk
from mitosheet.code_chunks.step_performers.fill_na_code_chunk import FillNaCodeChunk
from mitosheet.state import State
from mitosheet.step_performers.step_performer import StepPerformer
from mitosheet.step_performers.utils.utils import get_param
from mitosheet.types import ColumnID


class FillNaStepPerformer(StepPerformer):
    """
    Allows you to fill nan values.
    """

    @classmethod
    def step_version(cls) -> int:
        return 1

    @classmethod
    def step_type(cls) -> str:
        return 'fill_na'

    @classmethod
    def transpile(
        cls,
        prev_state: State,
        params: Dict[str, Any],
        execution_data: Optional[Dict[str, Any]],
    ) -> List[CodeChunk]:
        return [
            FillNaCodeChunk(
                prev_state, 
                get_param(params, 'sheet_index'),
                get_param(params, 'column_ids'),
                get_param(params, 'fill_method'),
            )
        ]
    
    @classmethod
    def get_modified_dataframe_indexes(cls, params: Dict[str, Any]) -> Set[int]:
        return {get_param(params, 'sheet_index')}
