from openpyxl import load_workbook

ALPHA = {
    'A': 1,
    'B': 2,
    'C': 3,
    'D': 4,
    'E': 5,
    'F': 6,
    'G': 7,
    'H': 8,
    'I': 9,
    'J': 10,
    'K': 11,
    'L': 12,
    'M': 13,
    'N': 14,
    'O': 15,
    'P': 16,
    'Q': 17,
    'R': 18,
    'S': 19,
    'T': 20,
    'U': 21,
    'V': 22,
    'W': 23,
    'X': 24,
    'Y': 25,
    'Z': 26
}

def parse_range(cellrange):
    cell1 = cellrange.split(":")[0]
    cell2 = cellrange.split(":")[1]

    min_col = ALPHA[cell1[0]]
    min_row = int(cell1[1:])

    max_col = int(ALPHA[cell2[0]])
    max_row = int(cell2[1:])

    return (min_row, min_col, max_row, max_col)

def get_names_list(filename, cellrange):
    wb = load_workbook(filename = filename)
    names = []

    min_row = min_col = max_row = max_col = None

    if cellrange:
        min_row, min_col, max_row, max_col = parse_range(cellrange)

    for row in wb.active.iter_rows(min_row=min_row, min_col=min_col, max_row=max_row, max_col=max_col, values_only=True):
        name = " ".join([str(cell) for cell in row if cell is not None])
        names.append(name)

    return [name for name in names if name != ""]