"use client";

import { useEffect, useState } from "react";
import { Box, Button, MenuItem, Stack, TextField, Typography } from "@mui/material";
import DownloadIcon from "@mui/icons-material/Download";
import { clientAuthFetch } from "@/app/utils/clientAuthFetch";
import { NEXT_PUBLIC_API_URL } from "@/config/api";
import {
  WorkbenchReportOption,
  fetchWorkbenchTruckRoutingLaneOptions,
  fetchWorkbenchTruckRoutingStoreOptions,
  fetchWorkbenchTruckRoutingSummaryPrecheck,
} from "@/app/api/doworkbench/truckRoutingSummaryWorkbenchApi";
import {
  FEATURE_USAGE,
  FEATURE_USAGE_ACTION,
  logFeatureUsage,
} from "@/lib/featureUsageLog";

const TruckRoutingSummaryTabWorkbench: React.FC = () => {
  const [storeOptions, setStoreOptions] = useState<WorkbenchReportOption[]>([]);
  const [laneOptions, setLaneOptions] = useState<WorkbenchReportOption[]>([]);
  const [storeId, setStoreId] = useState("");
  const [truckLanceCode, setTruckLanceCode] = useState("");
  const [date, setDate] = useState("");
  const [loading, setLoading] = useState(false);

  useEffect(() => {
    fetchWorkbenchTruckRoutingStoreOptions()
      .then(setStoreOptions)
      .catch((err) => console.error("Failed to load workbench store options", err));
  }, []);

  const onStoreChange = async (value: string) => {
    setStoreId(value);
    setTruckLanceCode("");
    try {
      const lanes = await fetchWorkbenchTruckRoutingLaneOptions(value);
      setLaneOptions(lanes);
    } catch (error) {
      console.error("Failed to load workbench lane options", error);
      setLaneOptions([]);
    }
  };

  const canDownload = storeId && truckLanceCode && date && !loading;

  const onDownload = async () => {
    if (!canDownload) return;
    try {
      const precheck = await fetchWorkbenchTruckRoutingSummaryPrecheck({
        storeId,
        truckLanceCode,
        date,
      });
      if (precheck.hasUnpickedOrders) {
        const confirmed = window.confirm(
          `此車線仍有 ${precheck.unpickedOrderCount} 張訂單未執拾。\n是否仍要列印 / 下載送貨路線摘要？`
        );
        if (!confirmed) return;
      }

      setLoading(true);
      const qs = new URLSearchParams({
        storeId,
        truckLanceCode,
        date,
      }).toString();
      const url = `${NEXT_PUBLIC_API_URL}/doPickOrder/workbench/truck-routing-summary/print?${qs}`;
      const response = await clientAuthFetch(url, {
        method: "GET",
        headers: { Accept: "application/pdf" },
      });
      if (!response.ok) {
        const errorText = await response.text();
        throw new Error(`HTTP ${response.status}: ${errorText}`);
      }

      const blob = await response.blob();
      const downloadUrl = window.URL.createObjectURL(blob);
      const link = document.createElement("a");
      link.href = downloadUrl;
      link.setAttribute("download", "TruckRoutingSummary.pdf");
      document.body.appendChild(link);
      link.click();
      link.remove();
      window.URL.revokeObjectURL(downloadUrl);
      logFeatureUsage(
        FEATURE_USAGE.TRUCK_ROUTING_SUMMARY,
        FEATURE_USAGE_ACTION.DOWNLOAD,
        `workbench-pdf:${storeId}:${truckLanceCode}:${date}`,
      );
    } catch (error) {
      console.error("Failed to download Workbench Truck Routing Summary", error);
      alert("下載 Workbench 送貨路線摘要失敗，請稍後再試。");
    } finally {
      setLoading(false);
    }
  };

  return (
    <Box sx={{ maxWidth: 820 }}>
      <Typography variant="h6" sx={{ mb: 2 }}>
        送貨路線摘要 (Workbench)
      </Typography>
      <Stack direction={{ xs: "column", md: "row" }} spacing={2} sx={{ mb: 2 }}>
        <TextField
          select
          fullWidth
          label="2/F 或 4/F"
          value={storeId}
          onChange={(e) => onStoreChange(e.target.value)}
        >
          {storeOptions.map((opt) => (
            <MenuItem key={opt.value} value={opt.value}>
              {opt.label}
            </MenuItem>
          ))}
        </TextField>
        <TextField
          select
          fullWidth
          label="車線"
          value={truckLanceCode}
          onChange={(e) => setTruckLanceCode(e.target.value)}
          disabled={!storeId}
        >
          {laneOptions.map((opt) => (
            <MenuItem key={opt.value} value={opt.value}>
              {opt.label}
            </MenuItem>
          ))}
        </TextField>
        <TextField
          fullWidth
          label="日期"
          type="date"
          value={date}
          InputLabelProps={{ shrink: true }}
          onChange={(e) => setDate(e.target.value)}
        />
      </Stack>
      <Button
        variant="contained"
        startIcon={<DownloadIcon />}
        disabled={!canDownload}
        onClick={onDownload}
      >
        {loading ? "生成中..." : "下載報告 (PDF)"}
      </Button>
    </Box>
  );
};

export default TruckRoutingSummaryTabWorkbench;