# Copyright 2018-2022 Streamlit Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""A bunch of useful code utilities."""

import re


def extract_args(line):
    """Parse argument strings from all outer parentheses in a line of code.

    Parameters
    ----------
    line : str
        A line of code

    Returns
    -------
    list of strings
        Contents of the outer parentheses

    Example
    -------
    >>> line = 'foo(bar, baz), "a", my(func)'
    >>> extract_args(line)
    ['bar, baz', 'func']

    """
    stack = 0
    startIndex = None
    results = []

    for i, c in enumerate(line):
        if c == "(":
            if stack == 0:
                startIndex = i + 1
            stack += 1
        elif c == ")":
            stack -= 1
            if stack == 0:
                results.append(line[startIndex:i])
    return results


def get_method_args_from_code(args, line):
    """Parse arguments from a stringified arguments list inside parentheses

    Parameters
    ----------
    args : list
        A list where it's size matches the expected number of parsed arguments
    line : str
        Stringified line of code with method arguments inside parentheses

    Returns
    -------
    list of strings
        Parsed arguments

    Example
    -------
    >>> line = 'foo(bar, baz, my(func, tion))'
    >>>
    >>> get_method_args_from_code(range(0, 3), line)
    ['bar', 'baz', 'my(func, tion)']

    """
    line_args = extract_args(line)[0]

    # Split arguments, https://stackoverflow.com/a/26634150
    if len(args) > 1:
        inputs = re.split(r",\s*(?![^(){}[\]]*\))", line_args)
        assert len(inputs) == len(args), "Could not split arguments"
    else:
        inputs = [line_args]
    return inputs