# -*- coding: utf-8 -*-
from ..utils import get_offset, verify_series

def midpoint(close, length=None, offset=None, **kwargs):
    """Indicator: Midpoint"""
    # Validate arguments
    close = verify_series(close)
    length = int(length) if length and length > 0 else 2
    min_periods = int(kwargs['min_periods']) if 'min_periods' in kwargs and kwargs['min_periods'] is not None else length
    offset = get_offset(offset)

    # Calculate Result
    lowest = close.rolling(length, min_periods=min_periods).min()
    highest = close.rolling(length, min_periods=min_periods).max()
    midpoint = 0.5 * (lowest + highest)

    # Offset
    if offset != 0:
        midpoint = midpoint.shift(offset)

    # Handle fills
    if 'fillna' in kwargs:
        midpoint.fillna(kwargs['fillna'], inplace=True)
    if 'fill_method' in kwargs:
        midpoint.fillna(method=kwargs['fill_method'], inplace=True)

    # Name and Categorize it
    midpoint.name = f"MIDPOINT_{length}"
    midpoint.category = 'overlap'

    return midpoint