from typing import Dict, Collection

from camisatoshi_wordpress_reports.constants import order_keys, custom_meta_data_keys
from camisatoshi_wordpress_reports.utils import safe_zero_division


class Order:
    def __init__(self, raw_data: Dict):
        self.raw_data = raw_data

    def __getitem__(self, item):
        return self.raw_data[item]

    @property
    def meta_data_entries(self):
        return {
            meta_data_entry["key"]: meta_data_entry["value"]
            for meta_data_entry in self.raw_data[order_keys.meta_data]
        }

    def units_of_sku(self, sku: str) -> int:
        units = 0
        for line in self[order_keys.line_items]:
            if line[order_keys.line_item_keys.sku] == sku:
                units += line[order_keys.line_item_keys.quantity]
        return units

    def sales_of_sku(self, sku: str) -> float:
        sales = 0
        for line in self[order_keys.line_items]:
            if line[order_keys.line_item_keys.sku] == sku:
                sales += float(line[order_keys.line_item_keys.total])
        return sales

    def sats_received_for_sku(self, sku: str) -> float:
        total_order_eur = float(self[order_keys.total])
        eur_of_sku = self.sales_of_sku(sku)

        monetary_weight_of_sku_in_order = safe_zero_division(eur_of_sku, total_order_eur)
        total_order_sats_received = float(
            self.meta_data_entries[custom_meta_data_keys.sats_received]
        )
        sats_received_for_sku = (
            monetary_weight_of_sku_in_order * total_order_sats_received
        )

        return sats_received_for_sku

    def contains_sku(self, sku: str) -> bool:
        for item in self[order_keys.line_items]:
            if item[order_keys.line_item_keys.sku] == sku:
                return True
        return False

    def contains_meta_data_entry(self, meta_data_entry_key: str) -> bool:
        if meta_data_entry_key in self.meta_data_entries.keys():
            return True
        return False

    def is_settled_with_um(self):
        is_settled = self.meta_data_entries.get(
            custom_meta_data_keys.is_settled_with_um, None
        )

        return bool(is_settled)

    @classmethod
    def from_api_response(cls, raw_data) -> "Order":
        return Order(raw_data)


class Orders:
    def __init__(self, orders: Collection[Order]):
        self._orders = orders

    def __len__(self):
        return len(self._orders)

    def __iter__(self):
        self._index = 0
        return self

    def __next__(self):
        if self._index < len(self._orders):
            next_order = self._orders[self._index]
            self._index += 1
            return next_order
        raise StopIteration

    def filter_orders_by_sku(self, sku: str) -> "Orders":
        filtered_orders = []

        for order in self:
            if order.contains_sku(sku):
                filtered_orders.append(order)

        return Orders(filtered_orders)

    def filter_orders_without_sats_received(self) -> "Orders":
        orders_without_sats_received = []

        for order in self:
            if not order.contains_meta_data_entry(custom_meta_data_keys.sats_received):
                orders_without_sats_received.append(order)
                continue

        return Orders(orders_without_sats_received)

    def filter_unsettled_orders(self) -> "Orders":
        unsettled_orders = []

        for order in self:
            if not order.is_settled_with_um():
                unsettled_orders.append(order)

        return Orders(unsettled_orders)