import { useState } from "react";
import { useLocation } from "react-router-dom";
import { Box, Typography, useMediaQuery, useTheme } from "@mui/material";
import SectionWrapper from "@components/SectionWrapper";
import ComplexNavText from "@root/components/ComplexNavText";
import { useTariffs } from "@root/utils/hooks/useTariffs";
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 { getMessageFromFetchError } from "@frontend/kitui";
import FreeTariffCard from "./FreeTariffCard";
import { addTariffToCart, useUserStore } from "@root/stores/user";
import { useDiscountStore } from "@root/stores/discounts";
import { useCustomTariffsStore } from "@root/stores/customTariffs";
import { Slider } from "./slider";
import { useCartStore } from "@root/stores/cart";

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

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 customTariffs = useCustomTariffsStore(state => state.customTariffsMap);
    const purchasesAmount = useUserStore(state => state.userAccount?.wallet.purchasesAmount) ?? 0;
    const cart = useCartStore(state => state.cart);
    const unit: string = String(location.pathname).slice(9);

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

  useTariffs({
    apiPage: 0,
    tariffsPerPage: 100,
    onNewTariffs: 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.map((tariff, index) => {
    const { price, tariffPriceAfterDiscounts } = calcIndividualTariffPrices(
      tariff,
      discounts,
      customTariffs,
      purchasesAmount,
      cart
    );

    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={
          <>
            {price !== undefined && price !== tariffPriceAfterDiscounts && (
              <Typography variant="oldPrice">
                {currencyFormatter.format(price / 100)}
              </Typography>
            )}
            {tariffPriceAfterDiscounts !== undefined && (
              <Typography variant="price">
                {currencyFormatter.format(tariffPriceAfterDiscounts / 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",
      }}
    >
      {upMd && (
        <ComplexNavText text1="Все тарифы — " text2={StepperText[unit]} />
      )}
      <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={{
          mt: "40px",
          mb: "30px",
          display: "grid",
          gap: "40px",
          gridTemplateColumns: "repeat(auto-fit, minmax(300px, 360px))",
        }}
      >
        {tariffElements}
      </Box>
      <Typography variant="h4" sx={{ mt: "50px", mb: "40px" }}>
        Ранее вы покупали
      </Typography>
      <Slider items={tariffElements} />
    </SectionWrapper>
  );
}