import { useState, useEffect, forwardRef, useMemo } from "react";
import {
  Box,
  Fab,
  Typography,
  Badge,
  Dialog,
  Slide,
  useTheme,
  useMediaQuery,
} from "@mui/material";

import CircleDoubleDown from "./CircleDoubleDownIcon";
import Chat from "./Chat";

import { useUserStore } from "@root/stores/user";
import { useTicketStore } from "@root/stores/tickets";

import type { ReactNode } from "react";
import type { TransitionProps } from "@mui/material/transitions";

const Transition = forwardRef(function Transition(
  props: TransitionProps & {
    children: ReactNode;
  },
  ref: React.Ref<unknown>
) {
  return (
    <Slide direction="up" ref={ref} {...props}>
      {props.children ? (
        <Box sx={{ height: "100%" }}>{props.children}</Box>
      ) : (
        <Box />
      )}
    </Slide>
  );
});

export default function FloatingSupportChat() {
  const [monitorType, setMonitorType] = useState<"desktop" | "mobile" | "">("");
  const [isChatOpened, setIsChatOpened] = useState<boolean>(false);
  const theme = useTheme();
  const isMobile = useMediaQuery(theme.breakpoints.down(800));
  const user = useUserStore((state) => state.user?._id);
  const { messages } = useTicketStore(
    (state) => state[user ? "authData" : "unauthData"]
  );

  const animation = {
    "@keyframes runningStripe": {
      "0%": {
        left: "10%",
        backgroundColor: "transparent",
      },
      "10%": {
        backgroundColor: "#ffffff",
      },
      "50%": {
        backgroundColor: "#ffffff",
        transform: "translate(400px, 0)",
      },
      "80%": {
        backgroundColor: "#ffffff",
      },

      "100%": {
        backgroundColor: "transparent",
        boxShadow: "none",
        left: "100%",
      },
    },
  };

  const unreadMessagesCount = useMemo(() => {
    let count = 0;

    // Идём с конца массива к началу
    for (let i = messages.length - 1; i >= 0; i--) {
      const message = messages[i];

      // Пропускаем сообщение с id "111"
      if (message.id === "111") continue;

      // Если сообщение не прочитано (shown.me !== 1)
      if (message.shown.me !== 1) {
        count++;
      } else {
        // Встретили прочитанное сообщение - прекращаем подсчёт
        break;
      }
    }

    return count;
  }, [messages]); // Зависимость от messages - пересчитывается при их изменении

  useEffect(() => {
    const onResize = () => {
      if (document.fullscreenElement) {
        setMonitorType(isMobile ? "mobile" : "desktop");

        return;
      }

      setMonitorType("");
    };

    window.addEventListener("resize", onResize);

    return () => {
      window.removeEventListener("resize", onResize);
    };
  }, [isMobile]);

  return (
    <Box
      sx={{
        position: "fixed",
        right: "20px",
        bottom: "10px",
        display: "flex",
        flexDirection: "column",
        gap: "8px",
        width: "clamp(200px, 100% - 40px, 454px)",
        zIndex: 10,
      }}
    >
      <Chat
        open={isChatOpened && (monitorType === "desktop" || !isMobile)}
        sx={{ alignSelf: "start", width: "clamp(200px, 100%, 400px)" }}
      />
      <Dialog
        fullScreen
        open={isChatOpened && (monitorType === "mobile" || isMobile)}
        onClose={() => setIsChatOpened(false)}
        TransitionComponent={Transition}
      >
        <Chat
          open={isChatOpened && (monitorType === "mobile" || isMobile)}
          onclickArrow={() => setIsChatOpened(false)}
        />
      </Dialog>
      <Fab
        disableRipple
        sx={{
          position: "relative",
          backgroundColor: "rgba(255, 255, 255, 0.7)",
          pl: "11px",
          pr: !isChatOpened ? "15px" : "11px",
          gap: "11px",
          height: "54px",
          borderRadius: "27px",
          alignSelf: "end",
          overflow: "hidden",
          "&:hover": {
            background: "rgba(255, 255, 255, 0.7)",
          },
        }}
        variant={"extended"}
        onClick={() => setIsChatOpened((prev) => !prev)}
      >
        {!isChatOpened && (
          <Box
            sx={{
              position: "absolute",
              bgcolor: "#FFFFFF",
              height: "100px",
              width: "25px",
              animation: "runningStripe  linear 3s infinite",
              transform:
                " skew(-10deg) rotate(70deg)  skewX(20deg) skewY(10deg)",
              boxShadow: "0px 3px 12px rgba(126, 42, 234, 0.1)",
              opacity: "0.4",
              ...animation,
            }}
          />
        )}
        <Badge
          badgeContent={unreadMessagesCount}
          sx={{
            "& .MuiBadge-badge": {
              display: isChatOpened ? "none" : "flex",
              color: "#FFFFFF",
              background: theme.palette.purple.main,
            },
          }}
        >
          <CircleDoubleDown isUp={isChatOpened} />
        </Badge>

        {!isChatOpened && (
          <Typography sx={{ zIndex: "10000" }}>Задайте нам вопрос</Typography>
        )}
      </Fab>
    </Box>
  );
}