"""DDEX deal terms logic concept"""
# use the existing territory_dates list and call get_deal_terms function
# get_deal_terms can be called at either Product or Track
# can attach any additional data (rights) to the object in the return list

def get_deal_terms(preorder_date, sale_start_date, pricing, instant_grats):
    deal_terms = []

    if preorder_date:
        deal_terms.extend(
            get_preorder_deal_terms(
                preorder_date,
                sale_start_date,
                pricing,
                instant_grats,
            )
        )

    deal_terms.extend(get_regular_deal_terms(sale_start_date, pricing))

    return deal_terms


def get_preorder_deal_terms(preorder_date, end_date, pricing, instant_grats):
    preorder_deal_terms = [preorder_date]

    if pricing and min(pricing.start_date) < end_date:
        # split deals
        preorder_deal_terms.extend(
            [start_date for start_date in pricing if star_date < end_date]
        )

    if instant_grats:
        preorder_deal_terms.extend([grat for grat in instant_grats])

    return preorder_deal_terms


def get_regular_deal_terms(sale_start_date, pricing):
    regular_deal_terms = [sale_start_date]

    if pricing:
        regular_deal_terms.extend(
            [start_date for start_date in pricing if start_date >= sale_start_date]
        )

    return regular_deal_terms