import { useState } from "react";
import { useLocation } from "react-router-dom";
import { Box, Typography, useMediaQuery, useTheme } from "@mui/material";
import SectionWrapper from "@components/SectionWrapper";
import { updateTariffs, useTariffStore } from "@root/stores/tariffs";
import { enqueueSnackbar } from "notistack";
import { Select } from "@root/components/Select";
import { Tabs } from "@root/components/Tabs";
import TariffCard from "./TariffCard";
import NumberIcon from "@root/components/NumberIcon";
import { currencyFormatter } from "@root/utils/currencyFormatter";
import { calcIndividualTariffPrices } from "@root/utils/calcTariffPrices";
import { Tariff, getMessageFromFetchError } from "@frontend/kitui";
import FreeTariffCard from "./FreeTariffCard";
import { addTariffToCart, useUserStore } from "@root/stores/user";
import { useDiscountStore } from "@root/stores/discounts";
import { Slider } from "./slider";
import { useCartStore } from "@root/stores/cart";
import { useAllTariffsFetcher } from "@root/utils/hooks/useAllTariffsFetcher";

const subPages = ["Шаблонизатор", "Опросник", "Сокращатель ссылок"];

const StepperText: Record<string, string> = {
  volume: "Тарифы на объём",
  time: "Тарифы на время",
};

export default function TariffPage() {
  const theme = useTheme();
  const upMd = useMediaQuery(theme.breakpoints.up("md"));
  const isMobile = useMediaQuery(theme.breakpoints.down(600));
  const location = useLocation();
  const tariffs = useTariffStore((state) => state.tariffs);
  const [selectedItem, setSelectedItem] = useState<number>(0);
  const discounts = useDiscountStore((state) => state.discounts);
  const purchasesAmount = useUserStore((state) => state.userAccount?.wallet.purchasesAmount) ?? 0;
  const cartTariffMap = useCartStore((state) => state.cartTariffMap);

  const unit: string = String(location.pathname).slice(9);
  const currentTariffs = Object.values(cartTariffMap).filter((tariff): tariff is Tariff => typeof tariff === "object");

  useAllTariffsFetcher({
    onSuccess: updateTariffs,
    onError: (error) => {
      const errorMessage = getMessageFromFetchError(error);
      if (errorMessage) enqueueSnackbar(errorMessage);
    },
  });

  function handleTariffItemClick(tariffId: string) {
    addTariffToCart(tariffId)
      .then(() => {
        enqueueSnackbar("Тариф добавлен в корзину");
      })
      .catch((error) => {
        const message = getMessageFromFetchError(error);
        if (message) enqueueSnackbar(message);
      });
  }

  const filteredTariffs = tariffs.filter((tariff) => {
    return tariff.privilegies.map((p) => p.type).includes("day") === (unit === "time") && !tariff.isDeleted;
  });

  const tariffElements = filteredTariffs
    .filter((tariff) => tariff.privilegies.length > 0)
    .map((tariff, index) => {
      const { priceBeforeDiscounts, priceAfterDiscounts } = calcIndividualTariffPrices(
        tariff,
        discounts,
        purchasesAmount,
        currentTariffs
      );

      return (
        <TariffCard
          key={tariff._id}
          icon={
            <NumberIcon
              number={index + 1}
              color={unit === "time" ? "#7E2AEA" : "#FB5607"}
              backgroundColor={unit === "time" ? "#EEE4FC" : "#FEDFD0"}
            />
          }
          buttonProps={{
            text: "Выбрать",
            onClick: () => handleTariffItemClick(tariff._id),
          }}
          headerText={tariff.name}
          text={tariff.privilegies.map((p) => `${p.name} - ${p.amount}`)}
          price={
            <>
              {priceBeforeDiscounts !== priceAfterDiscounts && (
                <Typography variant="oldPrice">{currencyFormatter.format(priceBeforeDiscounts / 100)}</Typography>
              )}
              <Typography variant="price">{currencyFormatter.format(priceAfterDiscounts / 100)}</Typography>
            </>
          }
        />
      );
    });

  if (tariffElements.length < 6) tariffElements.push(<FreeTariffCard key="free_tariff_card" />);
  else tariffElements.splice(5, 0, <FreeTariffCard key="free_tariff_card" />);

  return (
    <SectionWrapper
      maxWidth="lg"
      sx={{
        mt: "20px",
        mb: upMd ? "90px" : "63px",
        display: "flex",
        flexDirection: "column",
      }}
    >
      <Typography variant="h4" sx={{ marginBottom: "23px", mt: "20px" }}>
        {StepperText[unit]}
      </Typography>
      {isMobile ? (
        <Select items={subPages} selectedItem={selectedItem} setSelectedItem={setSelectedItem} />
      ) : (
        <Tabs items={subPages} selectedItem={selectedItem} setSelectedItem={setSelectedItem} />
      )}
      <Box
        sx={{
          justifyContent: "left",
          mt: "40px",
          mb: "30px",
          display: "grid",
          gap: "40px",
          gridTemplateColumns: "repeat(auto-fit, minmax(300px, 360px))",
        }}
      >
        {tariffElements}
      </Box>
      <Typography variant="h4" sx={{ mt: "40px" }}>
        Ранее вы покупали
      </Typography>
      <Slider items={tariffElements} />
    </SectionWrapper>
  );
}