"use client";
import React, { useState, useEffect, useCallback, useRef } from "react";
import {
  Box,
  Typography,
  Card,
  CardContent,
  Table,
  TableBody,
  TableCell,
  TableContainer,
  TableHead,
  TableRow,
  Paper,
  CircularProgress,
  Stack,
  IconButton,
  Collapse,
  Link as MuiLink,
} from "@mui/material";
import ExpandMoreIcon from "@mui/icons-material/ExpandMore";
import ExpandLessIcon from "@mui/icons-material/ExpandLess";
import NextLink from "next/link";
import { useTranslation } from "react-i18next";
import dayjs from "dayjs";
import type { Dayjs } from "dayjs";
import { DatePicker, LocalizationProvider } from "@mui/x-date-pickers";
import { AdapterDayjs } from "@mui/x-date-pickers/AdapterDayjs";
import {
  fetchDrinkProductionQty,
  DrinkProductionQtyResponse,
} from "@/app/api/jo/actions";

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

const formatQty = (qty: number | null | undefined): string => {
  if (qty === null || qty === undefined || Number.isNaN(qty)) return "-";
  return qty.toLocaleString(undefined, { maximumFractionDigits: 2 });
};

const formatProductionDate = (value: string | null | undefined): string => {
  if (!value) return "-";
  const parsed = dayjs(value);
  return parsed.isValid() ? parsed.format("YYYY-MM-DD") : value;
};

const getRowKey = (row: DrinkProductionQtyResponse, idx: number): string =>
  `${row.itemCode || "unknown"}-${idx}`;

/** FP-MTMS Version Checklist | Functions Ref. No. 26 | v1.0.0 | 2026-07-20 */
const DrinkProductionQtyDashboard: React.FC = () => {
  const { t } = useTranslation(["common", "jo", "productionProcess"]);
  const [data, setData] = useState<DrinkProductionQtyResponse[]>([]);
  const [loading, setLoading] = useState<boolean>(true);
  const [selectedDate, setSelectedDate] = useState<Dayjs>(dayjs());
  const [expandedRowKeys, setExpandedRowKeys] = useState<Set<string>>(
    new Set(),
  );
  const refreshCountRef = useRef<number>(0);
  const [lastDataRefreshTime, setLastDataRefreshTime] = useState<Dayjs | null>(
    null,
  );

  const loadData = useCallback(async () => {
    setLoading(true);
    try {
      const result = await fetchDrinkProductionQty(
        selectedDate.format("YYYY-MM-DD"),
      );
      setData(result || []);
      setExpandedRowKeys(new Set());
      setLastDataRefreshTime(dayjs());
      refreshCountRef.current += 1;
    } catch (error) {
      console.error("Error fetching drink production qty:", error);
      setData([]);
      setExpandedRowKeys(new Set());
    } finally {
      setLoading(false);
    }
  }, [selectedDate]);

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

  const toggleRowExpanded = (rowKey: string) => {
    setExpandedRowKeys((prev) => {
      const next = new Set(prev);
      if (next.has(rowKey)) {
        next.delete(rowKey);
      } else {
        next.add(rowKey);
      }
      return next;
    });
  };

  return (
    <Card sx={{ mb: 2 }}>
      <CardContent>
        <Typography variant="h5" sx={{ fontWeight: 600, mb: 2 }}>
          {t("Drink Production Qty Dashboard")}
        </Typography>

        <Stack direction="row" spacing={2} sx={{ mb: 3, alignItems: "center" }}>
          <LocalizationProvider dateAdapter={AdapterDayjs}>
            <DatePicker
              label={t("Date")}
              value={selectedDate}
              onChange={(newValue) => {
                if (newValue) setSelectedDate(newValue);
              }}
              format="YYYY-MM-DD"
              slotProps={{
                textField: { size: "small", sx: { minWidth: 160 } },
              }}
            />
          </LocalizationProvider>

          <Box sx={{ flexGrow: 1 }} />

          <Typography
            variant="body2"
            sx={{ color: "text.secondary" }}
            suppressHydrationWarning
          >
            {t("Auto-refresh every 10 minutes")}&nbsp;|&nbsp;
            {t("Last updated")}:{" "}
            {lastDataRefreshTime
              ? lastDataRefreshTime.format("HH:mm:ss")
              : "--:--:--"}
          </Typography>
        </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: 650 }}>
              <TableHead>
                <TableRow
                  sx={{
                    bgcolor: "#424242",
                    "& th": {
                      borderBottom: "none",
                      py: 1.5,
                      position: "sticky",
                      top: 0,
                      zIndex: 1,
                    },
                  }}
                >
                  <TableCell sx={{ width: 48 }} />
                  <TableCell sx={{ width: 160 }}>
                    <Typography variant="subtitle2" sx={{ fontWeight: 600 }}>
                      {t("Item Code")}
                    </Typography>
                  </TableCell>
                  <TableCell sx={{ width: 260 }}>
                    <Typography variant="subtitle2" sx={{ fontWeight: 600 }}>
                      {t("Goods Name")}
                    </Typography>
                  </TableCell>
                  <TableCell sx={{ width: 120 }}>
                    <Typography variant="subtitle2" sx={{ fontWeight: 600 }}>
                      {t("Unit")}
                    </Typography>
                  </TableCell>
                  <TableCell align="right" sx={{ width: 120 }}>
                    <Typography variant="subtitle2" sx={{ fontWeight: 600 }}>
                      {t("Stock Req. Qty")}
                    </Typography>
                  </TableCell>
                  <TableCell align="right" sx={{ width: 140 }}>
                    <Typography variant="subtitle2" sx={{ fontWeight: 600 }}>
                      {t("Production Qty")}
                    </Typography>
                  </TableCell>
                </TableRow>
              </TableHead>
              <TableBody>
                {data.length === 0 ? (
                  <TableRow>
                    <TableCell colSpan={6} align="center">
                      <Typography
                        variant="body2"
                        sx={{ py: 2, color: "text.secondary" }}
                      >
                        {t("No data available")}
                      </Typography>
                    </TableCell>
                  </TableRow>
                ) : (
                  data.map((row, idx) => {
                    const rowKey = getRowKey(row, idx);
                    const jobOrders = row.jobOrders ?? [];
                    const isExpanded = expandedRowKeys.has(rowKey);
                    const hasJobOrders = jobOrders.length > 0;

                    return (
                      <React.Fragment key={rowKey}>
                        <TableRow hover={hasJobOrders}>
                          <TableCell padding="checkbox">
                            {hasJobOrders ? (
                              <IconButton
                                size="small"
                                aria-label={
                                  isExpanded
                                    ? t("Collapse job order details")
                                    : t("Expand job order details")
                                }
                                onClick={() => toggleRowExpanded(rowKey)}
                              >
                                {isExpanded ? (
                                  <ExpandLessIcon fontSize="small" />
                                ) : (
                                  <ExpandMoreIcon fontSize="small" />
                                )}
                              </IconButton>
                            ) : null}
                          </TableCell>
                          <TableCell>
                            <Typography variant="body2">
                              {row.itemCode || "-"}
                            </Typography>
                          </TableCell>
                          <TableCell>
                            <Typography variant="body2">
                              {row.itemName || "-"}
                            </Typography>
                          </TableCell>
                          <TableCell>
                            <Typography variant="body2">
                              {row.uom || "-"}
                            </Typography>
                          </TableCell>
                          <TableCell align="right">
                            <Typography variant="body2">
                              {formatQty(row.totalReqQty)}
                            </Typography>
                          </TableCell>
                          <TableCell align="right">
                            <Typography variant="body2">
                              {formatQty(row.totalQty)}
                            </Typography>
                          </TableCell>
                        </TableRow>
                        {hasJobOrders && (
                          <TableRow>
                            <TableCell
                              colSpan={6}
                              sx={{ py: 0, borderBottom: 0 }}
                            >
                              <Collapse
                                in={isExpanded}
                                timeout="auto"
                                unmountOnExit
                              >
                                <Box sx={{ py: 1.5, pl: 6, pr: 2 }}>
                                  <Table size="small">
                                    <TableHead>
                                      <TableRow>
                                        <TableCell sx={{ fontWeight: 600 }}>
                                          {t("Job Order Code")}
                                        </TableCell>
                                        <TableCell sx={{ fontWeight: 600 }}>
                                          {t("Production Date")}
                                        </TableCell>
                                        <TableCell
                                          align="right"
                                          sx={{ fontWeight: 600 }}
                                        >
                                          {t("Stock Req. Qty")}
                                        </TableCell>
                                        <TableCell
                                          align="right"
                                          sx={{ fontWeight: 600 }}
                                        >
                                          {t("Production Qty")}
                                        </TableCell>
                                      </TableRow>
                                    </TableHead>
                                    <TableBody>
                                      {jobOrders.map((jo) => (
                                        <TableRow
                                          key={`${rowKey}-jo-${jo.jobOrderId}`}
                                        >
                                          <TableCell>
                                            {jo.jobOrderId > 0 ? (
                                              <MuiLink
                                                component={NextLink}
                                                href={`/jo/edit?id=${jo.jobOrderId}`}
                                                underline="hover"
                                              >
                                                {jo.jobOrderCode ||
                                                  `JO-${jo.jobOrderId}`}
                                              </MuiLink>
                                            ) : (
                                              jo.jobOrderCode || "-"
                                            )}
                                          </TableCell>
                                          <TableCell>
                                            {formatProductionDate(
                                              jo.productionDate,
                                            )}
                                          </TableCell>
                                          <TableCell align="right">
                                            {formatQty(jo.reqQty)}
                                          </TableCell>
                                          <TableCell align="right">
                                            {formatQty(jo.productionQty)}
                                          </TableCell>
                                        </TableRow>
                                      ))}
                                    </TableBody>
                                  </Table>
                                </Box>
                              </Collapse>
                            </TableCell>
                          </TableRow>
                        )}
                      </React.Fragment>
                    );
                  })
                )}
              </TableBody>
            </Table>
          </TableContainer>
        )}
      </CardContent>
    </Card>
  );
};

export default DrinkProductionQtyDashboard;
