"use client";

import React, { useState, useEffect, useCallback, useRef } from "react";
import {
  Box,
  Card,
  CardContent,
  CircularProgress,
  Table,
  TableBody,
  TableCell,
  TableContainer,
  TableHead,
  TableRow,
  Paper,
  Typography,
  FormControl,
  Select,
  MenuItem,
  Stack
} from "@mui/material";
import { useTranslation } from "react-i18next";
import dayjs from "dayjs";
import { fetchOperatorKpi, OperatorKpiResponse, OperatorKpiProcessInfo } from "@/app/api/jo/actions";
import { arrayToDayjs } from "@/app/utils/formatUtil";

const REFRESH_INTERVAL = 10 * 60 * 1000; // 10 分鐘

const OperatorKpiDashboard: React.FC = () => {
  const { t } = useTranslation(["common", "jo"]);
  const [data, setData] = useState<OperatorKpiResponse[]>([]);
  const [loading, setLoading] = useState<boolean>(true);
  const [selectedDate, setSelectedDate] = useState(dayjs().format("YYYY-MM-DD"));
  const refreshCountRef = useRef<number>(0);
  const [now, setNow] = useState(dayjs());
  const [lastDataRefreshTime, setLastDataRefreshTime] = useState<dayjs.Dayjs | null>(null);

  const formatTime = (timeData: any): string => {
    if (!timeData) return "-";

    if (Array.isArray(timeData)) {
      try {
        const parsed = arrayToDayjs(timeData, true);
        if (parsed.isValid()) {
          return parsed.format("HH:mm");
        }
      } catch (e) {
        console.error("Error parsing time array:", e);
      }
    }

    if (typeof timeData === "string") {
      const parsed = dayjs(timeData);
      if (parsed.isValid()) {
        return parsed.format("HH:mm");
      }
    }

    return "-";
  };

  const formatMinutesToHHmm = (minutes: number): string => {
    if (!minutes || minutes <= 0) return "00:00";
    const hours = Math.floor(minutes / 60);
    const mins = minutes % 60;
    return `${hours.toString().padStart(2, "0")}:${mins.toString().padStart(2, "0")}`;
  };

  const loadData = useCallback(async () => {
    setLoading(true);
    try {
      const result = await fetchOperatorKpi(selectedDate);
      setData(result);
      setLastDataRefreshTime(dayjs());
      refreshCountRef.current += 1;
    } catch (error) {
      console.error("Error fetching operator KPI:", error);
      setData([]);
    } finally {
      setLoading(false);
    }
  }, [selectedDate]);

  useEffect(() => {
    loadData();
    const interval = setInterval(() => {
      loadData();
    }, REFRESH_INTERVAL);
    return () => clearInterval(interval);
  }, [loadData]);

    useEffect(() => {
    const timer = setInterval(() => setNow(dayjs()), 60 * 1000);
    return () => clearInterval(timer);
  }, []);

  const renderCurrentProcesses = (processes: OperatorKpiProcessInfo[]) => {
    if (!processes || processes.length === 0) {
      return (
        <Typography variant="body2" color="text.secondary" sx={{ py: 1 }}>
          -
        </Typography>
      );
    }
  
    // 只顯示目前一個處理中的工序（樣式比照 Excel：欄位名稱縱向排列）
    const p = processes[0];
    const jobOrder = p.jobOrderCode ? `[${p.jobOrderCode}]` : "-";
    const itemInfo = p.itemCode && p.itemName 
    ? `${p.itemCode} - ${p.itemName}`
    : p.itemCode || p.itemName || "-";

    // 格式化所需時間（分鐘轉換為 HH:mm）
    const formatRequiredTime = (minutes: number | null | undefined): string => {
      if (!minutes || minutes <= 0) return "-";
      const hours = Math.floor(minutes / 60);
      const mins = minutes % 60;
      return `${hours.toString().padStart(2, "0")}:${mins.toString().padStart(2, "0")}`;
    };
  
    // 計算預計完成時間
    const calculateEstimatedCompletionTime = (): string => {
      if (!p.startTime || !p.processingTime || p.processingTime <= 0) return "-";
      
      try {
        const start = arrayToDayjs(p.startTime, true);
        if (!start.isValid()) return "-";
        
        const estimated = start.add(p.processingTime, "minute");
        return estimated.format("HH:mm");
      } catch (e) {
        console.error("Error calculating estimated completion time:", e);
        return "-";
      }
    };
  
    return (
      <>
        <Typography variant="body2" sx={{ lineHeight: 1.6 }}>
          {t("Job Order and Product")}: {jobOrder} {itemInfo}
        </Typography>
        <Typography variant="body2" sx={{ lineHeight: 1.6 }}>
          {t("Process")}: {p.processName || "-"}
        </Typography>
        <Typography variant="body2" sx={{ lineHeight: 1.6 }}>
          {t("Start Time")}: {formatTime(p.startTime)}
        </Typography>
        <Typography variant="body2" sx={{ lineHeight: 1.6 }}>
          {t("Required Time")}: {formatRequiredTime(p.processingTime)}
        </Typography>
        <Typography variant="body2" sx={{ lineHeight: 1.6 }}>
          {t("Estimated Completion Time")}: {calculateEstimatedCompletionTime()}
        </Typography>
      </>
    );
  };

  return (
    <Card sx={{ mb: 2 }}>
      <CardContent>
         {/* Title */}
        <Typography variant="h5" sx={{ fontWeight: 600, mb: 2 }}>
          {t("Operator KPI Dashboard")}
        </Typography>

        {/* Filters */}
        <Stack direction="row" spacing={2} sx={{ mb: 3 }}>
          <FormControl size="small" sx={{ minWidth: 160 }}>
            <Select
              value={selectedDate}
              onChange={(e) => setSelectedDate(e.target.value)}
            >
              <MenuItem value={dayjs().format("YYYY-MM-DD")}>{t("Today")}</MenuItem>
              <MenuItem value={dayjs().subtract(1, "day").format("YYYY-MM-DD")}>{t("Yesterday")}</MenuItem>
              <MenuItem value={dayjs().subtract(2, "day").format("YYYY-MM-DD")}>{t("Two Days Ago")}</MenuItem>
            </Select>
          </FormControl>

          <Box sx={{ flexGrow: 1 }} />
          <Stack direction="row" spacing={2} sx={{ alignSelf: 'center' }}>
            <Typography variant="body2" sx={{ color: 'text.secondary' }}>
              {t("Now")}: {now.format('HH:mm')}
            </Typography>
            <Typography variant="body2" sx={{ color: 'text.secondary' }}>
              {t("Auto-refresh every 10 minutes")} | {t("Last updated")}: {lastDataRefreshTime ? lastDataRefreshTime.format('HH:mm:ss') : '--:--:--'}
            </Typography>
          </Stack>
        </Stack>

        {loading ? (
          <Box sx={{ display: "flex", justifyContent: "center", p: 3 }}>
            <CircularProgress />
          </Box>
        ) : (
          <TableContainer sx={{ border: "3px solid #135fed", overflowX: "auto", maxHeight: 440, overflow: 'auto' }}
            component={Paper}
          >
            <Table size="small" sx={{ minWidth: 800 }}>
              <TableHead>
                <TableRow 
                  sx={{
                    bgcolor: "#424242",
                    "& th": {
                      borderBottom: "none",
                      py: 1.5,
                      position: 'sticky', top: 0, zIndex: 1
                    },
                  }}
                >
                  <TableCell align="right" sx={{ width: 80 }}>
                    <Typography
                      variant="subtitle2"
                      sx={{
                        fontWeight: 600,
                        //color: "#ffffff",
                      }}
                    >
                      {t("No.")}
                    </Typography>
                  </TableCell>
                  <TableCell sx={{ minWidth: 280 }}>
                    <Typography
                      variant="subtitle2"
                      sx={{
                        fontWeight: 600,
                        //color: "#ffffff",
                      }}
                    >
                      {t("Operator")}
                    </Typography>
                  </TableCell>
                  <TableCell sx={{ minWidth: 300 }}>
                    <Typography
                      variant="subtitle2"
                      sx={{
                        fontWeight: 600,
                        //color: "#ffffff",
                      }}
                    >
                      {t("Job Details")}
                    </Typography>
                  </TableCell>
                </TableRow>
              </TableHead>
              <TableBody>
                {data.length === 0 ? (
                  <TableRow>
                    <TableCell colSpan={4} align="center">
                      {t("No data available")}
                    </TableCell>
                  </TableRow>
                ) : (
                  data.map((row, index) => {
                    const jobOrderCount = row.totalJobOrderCount || 0;

                    return (
                      <TableRow
                        key={row.operatorId}
                        sx={{
                          "&:hover": {
                            bgcolor: "#f9f9f9",
                          },
                          "& td": {
                            borderBottom: "1px solid #e0e0e0",
                            py: 2,
                            verticalAlign: "top",
                          },
                        }}
                      >
                        <TableCell align="right"
                          sx={{
                            width: 80,
                            fontWeight: 500,
                            verticalAlign: "top",
                          }}
                        >
                          {index + 1}
                        </TableCell>
                        <TableCell
                          sx={{
                            minWidth: 280,
                            padding: 0,
                            verticalAlign: "top",
                            height: "100%",
                          }}
                        >
                          <Box
                            sx={{
                              p: 1.5,
                              display: "flex",
                              flexDirection: "column",
                              gap: 0.75,
                              bgcolor: "#f5f5f5",
                              border: "1px solid #e0e0e0",
                              borderRadius: 1.5,
                              boxSizing: "border-box",
                              height: "180px",

                            }}
                          >
                            <Typography variant="body2" sx={{ lineHeight: 1.6 }}>
                              {t("Operator Name & No.")}:{" "}
                              <Box component="span" sx={{ fontWeight: 500 }}>
                                {row.operatorName || "-"}{" "}
                                {row.staffNo ? `(${row.staffNo})` : ""}
                              </Box>
                            </Typography>
                            <Typography variant="body2" sx={{ lineHeight: 1.6 }}>
                              {t("Count of Job Orders")}:{" "}
                              <Box component="span" sx={{ fontWeight: 500 }}>
                                {jobOrderCount}
                              </Box>
                            </Typography>
                            <Typography variant="body2" sx={{ lineHeight: 1.6 }}>
                              {t("Total Processing Time")}:{" "}
                              <Box component="span" sx={{ fontWeight: 500 }}>
                                {formatMinutesToHHmm(row.totalProcessingMinutes || 0)}
                              </Box>
                            </Typography>
                          </Box>
                        </TableCell>
                        <TableCell
                          sx={{
                            minWidth: 300,
                            padding: 0,
                            verticalAlign: "top",
                            height: "100%",
                          }}
                        >
                          <Box
                            sx={{
                              p: 1.5,
                              display: "flex",
                              flexDirection: "column",
                              gap: 0.75,
                              bgcolor: "#f5f5f5",
                              border: "1px solid #e0e0e0",
                              borderRadius: 1.5,
                              boxSizing: "border-box",
                              height: "180px",
                            }}
                          >
                            {renderCurrentProcesses(row.currentProcesses)}
                          </Box>
                        </TableCell>
                      </TableRow>
                    );
                  })
                )}
              </TableBody>
            </Table>
          </TableContainer>
        )}
      </CardContent>
    </Card>
  );
};

export default OperatorKpiDashboard;