import {
  Avatar,
  MenuItem,
  Select,
  SelectChangeEvent,
  Typography,
  useMediaQuery,
  useTheme,
} from "@mui/material";
import Box from "@mui/material/Box";
import * as React from "react";
import { FC, useCallback, useEffect, useMemo, useRef, useState } from "react";
import "./CustomSelect.css";
import arrow_down from "../../assets/icons/arrow_down.svg";
import { getUsers, PaginationRequest, User } from "@api/integration";

type CustomSelectProps = {
  selectedItem: string | null;
  setSelectedItem: (value: string | null) => void;
  type?: string;
};


export const CustomSelect: FC<CustomSelectProps> = ({
  selectedItem,
  setSelectedItem,
  type,
}) => {
  const theme = useTheme();
  const isMobile = useMediaQuery(theme.breakpoints.down(600));
  const [opened, setOpened] = useState<boolean>(false);
  const [currentValue, setCurrentValue] = useState<string | null>(selectedItem);
  const [users, setUsers] = useState<User[]>([]);
  const [isLoading, setIsLoading] = useState(false);
  const [page, setPage] = useState(1);
  const [hasMoreItems, setHasMoreItems] = useState(true);
  const SIZE = 25;
  const ref = useRef<HTMLDivElement | null>(null);
  const selectWidth = ref.current ? ref.current.offsetWidth : undefined;

  const [savedValue, setSavedValue] = useState<number | null>(null);
  const [userName, setUserName] = useState<string>("");

  const onSelectItem = useCallback(
    (event: SelectChangeEvent<HTMLDivElement>) => {
      const newValue = event.target.value.toString();
      const selectedUser = users.find((user) => user.amoUserID == Number(newValue));
      setUserName(selectedUser.name)
      if (selectedUser) {
        //для сохранения ID выбранного пользователя в стейт или конфиг...
        setSavedValue(selectedUser.id);
      }
      setCurrentValue(newValue);
      setSelectedItem(newValue);
    },
    [setSelectedItem, setCurrentValue, setSavedValue, users],
  );

  const toggleOpened = useCallback(() => {
    setOpened((isOpened) => !isOpened);
  }, []);

  const handleScroll = (e: React.UIEvent<HTMLDivElement>) => {
    const scrollHeight = e.currentTarget.scrollHeight;
    const scrollTop = e.currentTarget.scrollTop;
    const clientHeight = e.currentTarget.clientHeight;
    const scrolledToBottom = scrollTop / (scrollHeight - clientHeight) > 0.9;

    if (scrolledToBottom && !isLoading && hasMoreItems) {
      setPage((prevPage) => prevPage + 1);
    }
  };

  useEffect(() => {
    if (type === "typeUsers" && hasMoreItems) {
      setIsLoading(true);
      const pagination: PaginationRequest = {
        page: page,
        size: SIZE,
      };
      getUsers(pagination).then(([response]) => {
        if (response && response.items !== null) {
          setUsers((prevItems) => [...prevItems, ...response.items]);
          if (response.items.length < SIZE) {
            setHasMoreItems(false);
          }
        }
        setIsLoading(false);
      });
    }
  }, [page, type, hasMoreItems]);

  const menuItems = useMemo(() => {
    if (type === "typeUsers" && users && users.length !== 0) {
      return users.map((user) => (
        <MenuItem
          key={user.amoUserID}
          value={user.amoUserID}
          sx={{
            padding: "6px 0",
            zIndex: 2,
            borderTop: "1px solid rgba(154, 154, 175, 0.1)",
            width: "auto",
          }}
        >
          <Box
            sx={{
              fontSize: "16px",
              color: "#4D4D4D",
              display: "flex",
              flexDirection: isMobile ? "column" : "row",
              justifyContent: "space-evenly",
              width: "100%",
            }}
          >
            <Typography
              sx={{
                width: "33%",
                borderRight: isMobile
                  ? "none"
                  : "1px solid  rgba(154, 154, 175, 0.1)",
                padding: isMobile ? "5px 0 5px 20px" : "10px 0 10px 20px",
              }}
            >
              {user.name}
            </Typography>
            <Typography
              sx={{
                width: "33%",
                borderRight: isMobile
                  ? "none"
                  : "1px solid  rgba(154, 154, 175, 0.1)",
                padding: isMobile ? "5px 0 5px 20px" : "10px 0 10px 20px",
                color: isMobile ? "#9A9AAF" : "#4D4D4D",
              }}
            >
              {user.email}
            </Typography>
            <Typography
              sx={{
                width: "33%",
                padding: isMobile ? "5px 0 5px 20px" : "10px 0 10px 20px",
                color: isMobile ? "#9A9AAF" : "#4D4D4D",
              }}
            >
              {user.role}
            </Typography>
          </Box>
        </MenuItem>
      ));
    }
    return (
      <MenuItem key={"-1"} disabled sx={{ padding: "12px", zIndex: 2 }}>
        нет данных
      </MenuItem>
    );
  }, [users, type]);

  return (
    <Box>
      <Box
        sx={{
          zIndex: 3,
          position: "relative",
          width: "100%",
          height: "56px",
          padding: "5px",
          color:
            currentValue === null
              ? theme.palette.grey2.main
              : theme.palette.brightPurple.main,
          border: `2px solid ${theme.palette.common.white}`,
          borderRadius: "30px",
          background: "#EFF0F5",
          display: "flex",
          alignItems: "center",
          cursor: "pointer",
        }}
        onClick={() => ref.current?.click()}
      >
        <Avatar sx={{ width: 46, height: 46, marginRight: 1 }} />
        <Typography
          sx={{
            marginLeft: isMobile ? "10px" : "20px",
            fontWeight: currentValue === null ? "400" : "500",
            fontSize: isMobile ? "14px" : "16px",
            textOverflow: "ellipsis",
            whiteSpace: "nowrap",
            overflow: "hidden",
            flexGrow: 1,
          }}
        >
          {userName || "Выберите ответственного за сделку"}
        </Typography>
        <img
          src={arrow_down}
          alt="check"
          style={{
            position: "absolute",
            top: "50%",
            right: "10px",
            transform: `translateY(-50%) rotate(${opened ? "180deg" : "0deg"}`,
            height: "36px",
            width: "36px",
          }}
          className={`select-icon ${opened ? "opened" : ""}`}
        />
      </Box>
      <Select
        ref={ref}
        className="select"
        value={""}
        open={opened}
        MenuProps={{
          disablePortal: true,
          PaperProps: {
            onScroll: handleScroll,
            style: {
              zIndex: 2,
              maxHeight: "300px",
              overflow: "auto",
              overflowX: "auto",
              maxWidth: selectWidth,
            },
          },
        }}
        sx={{}}
        onChange={onSelectItem}
        onClick={toggleOpened}
      >
        {menuItems}
      </Select>
    </Box>
  );
};