__version__ = "0.1.0"
__author__ = "Tabledevil <tabledevil@gmail.com>"

from visidata import Sheet, BaseSheet, vd


@Sheet.api
def hide_empty_and_superfluous_cols(sheet):
    """
    Given a sheet, hides columns that are empty or superfluous (contain the same
    value in every row).
    """
    # Count how many columns were hidden
    counter = 0
    # Check each column for being empty or superfluous
    for col in sheet.visibleCols:
        # If the column is not hidden
        if col.width and col.width > 0:
            # Check if the column is empty (all cells are empty or None)
            if all([col.getValue(row) in (None, "", "null") for row in sheet.rows]):
                # Hide the column
                col.width = 0
                counter += 1
                # Skip the next check for same values since all cells are empty or None
                continue

            # Check if the column is superfluous (contains the same value in every row)
            # collect all values in the column as strings
            values = set([f'{col.getValue(row)}' for row in sheet.rows if col.getValue(row) not in (None, "", "null")])
            # If there is only one value in the column
            if len(values) == 1:
                # Hide the column
                col.width = 0
                counter += 1

        vd.status(f"Hid {counter} empty/superfluous columns.")
    else:
        vd.status("No empty/superfluous columns to hide.")

Sheet.addCommand(None, "tke-hidecol", "sheet.hide_empty_and_superfluous_cols()")