"use client";

import {
  Box,
  Card,
  CardContent,
  Typography,
  Table,
  TableBody,
  TableCell,
  TableContainer,
  TableHead,
  TablePagination,
  TableRow,
  Paper,
  Button,
  CircularProgress,
  Alert,
  Dialog,
  DialogTitle,
  DialogContent,
  DialogActions,
  TextField,
  Grid,
  FormControl,
  InputLabel,
  Select,
  MenuItem,
  Snackbar,
} from "@mui/material";
import AddIcon from "@mui/icons-material/Add";
import SaveIcon from "@mui/icons-material/Save";
import { useState, useMemo } from "react";
import { useRouter } from "next/navigation";
import { useTranslation } from "react-i18next";
import { findAllUniqueTruckLaneCombinationsClient, createTruckWithoutShopClient } from "@/app/api/shop/client";
import type { Truck } from "@/app/api/shop/actions";
import SearchBox, { Criterion } from "../SearchBox";
import { formatDepartureTime, normalizeStoreId } from "@/app/utils/formatUtil";

type SearchQuery = {
  truckLanceCode: string;
  departureTime: string;
  storeId: string;
};

type SearchParamNames = keyof SearchQuery;

const TruckLane: React.FC = () => {
  const { t } = useTranslation("common");
  const router = useRouter();
  const [truckData, setTruckData] = useState<Truck[]>([]);
  const [loading, setLoading] = useState<boolean>(false);
  const [error, setError] = useState<string | null>(null);
  const [filters, setFilters] = useState<Record<string, string>>({});
  const [page, setPage] = useState(0);
  const [rowsPerPage, setRowsPerPage] = useState(10);
  const [addDialogOpen, setAddDialogOpen] = useState<boolean>(false);
  const [newTruck, setNewTruck] = useState({
    truckLanceCode: "",
    departureTime: "",
    storeId: "2F",
  });
  const [saving, setSaving] = useState<boolean>(false);
  const [snackbarOpen, setSnackbarOpen] = useState<boolean>(false);
  const [snackbarMessage, setSnackbarMessage] = useState<string>("");

  // Client-side filtered rows (contains-matching)
  const filteredRows = useMemo(() => {
    const fKeys = Object.keys(filters).filter((k) => String(filters[k] ?? "").trim() !== "");
    if (fKeys.length === 0) return truckData;
    
    return truckData.filter((truck) => {
      for (const key of fKeys) {
        const filterValue = String(filters[key] ?? "").trim().toLowerCase();
        
        if (key === "truckLanceCode") {
          const truckCode = String(truck.truckLanceCode ?? "").trim().toLowerCase();
          if (!truckCode.includes(filterValue)) return false;
        } else if (key === "departureTime") {
          const formattedTime = formatDepartureTime(
            Array.isArray(truck.departureTime) 
              ? truck.departureTime 
              : (truck.departureTime ? String(truck.departureTime) : null)
          );
          if (!formattedTime.toLowerCase().includes(filterValue)) return false;
        } else if (key === "storeId") {
          const displayStoreId = normalizeStoreId(truck.storeId);
          if (!displayStoreId.toLowerCase().includes(filterValue)) return false;
        }
      }
      return true;
    });
  }, [truckData, filters]);

  // Paginated rows
  const paginatedRows = useMemo(() => {
    const startIndex = page * rowsPerPage;
    return filteredRows.slice(startIndex, startIndex + rowsPerPage);
  }, [filteredRows, page, rowsPerPage]);

  const handleSearch = async (inputs: Record<string, string>) => {
    setLoading(true);
    setError(null);
    try {
      const data = await findAllUniqueTruckLaneCombinationsClient() as Truck[];
      const uniqueCodes = new Map<string, Truck>();
      (data || []).forEach((truck) => {
        const code = String(truck.truckLanceCode ?? "").trim();
        if (code && !uniqueCodes.has(code)) {
          uniqueCodes.set(code, truck);
        }
      });
      setTruckData(Array.from(uniqueCodes.values()));
      setFilters(inputs);
      setPage(0);
    } catch (err: any) {
      console.error("Failed to load truck lanes:", err);
      setError(err?.message ?? String(err) ?? t("Failed to load truck lanes"));
    } finally {
      setLoading(false);
    }
  };

  const handlePageChange = (event: unknown, newPage: number) => {
    setPage(newPage);
  };

  const handleRowsPerPageChange = (event: React.ChangeEvent<HTMLInputElement>) => {
    setRowsPerPage(parseInt(event.target.value, 10));
    setPage(0); // Reset to first page when changing rows per page
  };

  const handleViewDetail = (truck: Truck) => {
    // Navigate to truck lane detail page using truckLanceCode
    const truckLanceCode = String(truck.truckLanceCode || "").trim();
    if (truckLanceCode) {
      // Use router.push with proper URL encoding
      const url = new URL(`/settings/shop/truckdetail`, window.location.origin);
      url.searchParams.set("truckLanceCode", truckLanceCode);
      router.push(url.pathname + url.search);
    }
  };

  const handleOpenAddDialog = () => {
    setNewTruck({
      truckLanceCode: "",
      departureTime: "",
      storeId: "2F",
    });
    setAddDialogOpen(true);
    setError(null);
  };

  const handleCloseAddDialog = () => {
    setAddDialogOpen(false);
    setNewTruck({
      truckLanceCode: "",
      departureTime: "",
      storeId: "2F",
    });
  };

  const handleCreateTruck = async () => {
    // Validate all required fields
    const missingFields: string[] = [];

    if (!newTruck.truckLanceCode.trim()) {
      missingFields.push(t("TruckLance Code"));
    }

    if (!newTruck.departureTime) {
      missingFields.push(t("Departure Time"));
    }

    if (missingFields.length > 0) {
      const message = `${t("Please fill in the following required fields:")} ${missingFields.join(", ")}`;
      setSnackbarMessage(message);
      setSnackbarOpen(true);
      return;
    }

    // Check if truckLanceCode already exists
    const trimmedCode = newTruck.truckLanceCode.trim();
    const existingTruck = truckData.find(
      (truck) => String(truck.truckLanceCode || "").trim().toLowerCase() === trimmedCode.toLowerCase()
    );

    if (existingTruck) {
      setSnackbarMessage(t("Truck lane code already exists. Please use a different code."));
      setSnackbarOpen(true);
      return;
    }

    setSaving(true);
    setError(null);
    try {
      await createTruckWithoutShopClient({
        store_id: newTruck.storeId,
        truckLanceCode: newTruck.truckLanceCode.trim(),
        departureTime: newTruck.departureTime.trim(),
        loadingSequence: 0,
        districtReference: null,
        remark: null,
      });
      
      // Refresh truck data after create
      const data = await findAllUniqueTruckLaneCombinationsClient() as Truck[];
      const uniqueCodes = new Map<string, Truck>();
      data.forEach((truck) => {
        const code = String(truck.truckLanceCode ?? "").trim();
        if (code && !uniqueCodes.has(code)) {
          uniqueCodes.set(code, truck);
        }
      });
      setTruckData(Array.from(uniqueCodes.values()));
      
      handleCloseAddDialog();
    } catch (err: unknown) {
      console.error("Failed to create truck:", err);
      const errorMessage = err instanceof Error ? err.message : String(err);
      setError(errorMessage || t("Failed to create truck"));
    } finally {
      setSaving(false);
    }
  };

  const criteria: Criterion<SearchParamNames>[] = [
    { type: "text", label: t("TruckLance Code"), paramName: "truckLanceCode" },
    { type: "time", label: t("Departure Time"), paramName: "departureTime" },
    { type: "text", label: t("Store ID"), paramName: "storeId" },
  ];

  return (
    <Box>
      <Card sx={{ mb: 2 }}>
        <CardContent>
          <SearchBox
            criteria={criteria as Criterion<string>[]}
            onSearch={handleSearch}
            onReset={() => {
              setTruckData([]);
              setFilters({});
            }}
          />
        </CardContent>
      </Card>

      <Card>
        <CardContent>
          <Box sx={{ display: "flex", justifyContent: "space-between", alignItems: "center", mb: 2 }}>
            <Typography variant="h6">{t("Truck Lane")}</Typography>
            <Button
              variant="contained"
              startIcon={<AddIcon />}
              onClick={handleOpenAddDialog}
              disabled={saving}
            >
              {t("Add Truck Lane")}
            </Button>
          </Box>
          {error && (
            <Alert severity="error" sx={{ mb: 2 }}>
              {error}
            </Alert>
          )}

          {loading ? (
            <Box sx={{ display: "flex", justifyContent: "center", p: 4 }}>
              <CircularProgress />
            </Box>
          ) : (
          <TableContainer component={Paper}>
            <Table>
              <TableHead>
                <TableRow>
                  <TableCell sx={{ width: "250px", minWidth: "250px", maxWidth: "250px" }}>
                    {t("TruckLance Code")}
                  </TableCell>
                  <TableCell sx={{ width: "200px", minWidth: "200px", maxWidth: "200px" }}>
                    {t("Departure Time")}
                  </TableCell>
                  <TableCell sx={{ width: "150px", minWidth: "150px", maxWidth: "150px" }}>
                    {t("Store ID")}
                  </TableCell>
                  <TableCell align="right" sx={{ width: "150px", minWidth: "150px", maxWidth: "150px" }}>
                    {t("Actions")}
                  </TableCell>
                </TableRow>
              </TableHead>
              <TableBody>
                {paginatedRows.length === 0 ? (
                  <TableRow>
                    <TableCell colSpan={4} align="center">
                      <Typography variant="body2" color="text.secondary">
                        {t("No Truck Lane data available")}
                      </Typography>
                    </TableCell>
                  </TableRow>
                ) : (
                  paginatedRows.map((truck) => (
                    <TableRow key={truck.id ?? `truck-${truck.truckLanceCode}`}>
                      <TableCell sx={{ width: "250px", minWidth: "250px", maxWidth: "250px" }}>
                        {String(truck.truckLanceCode ?? "-")}
                      </TableCell>
                      <TableCell sx={{ width: "200px", minWidth: "200px", maxWidth: "200px" }}>
                        {formatDepartureTime(
                          Array.isArray(truck.departureTime) 
                            ? truck.departureTime 
                            : (truck.departureTime ? String(truck.departureTime) : null)
                        )}
                      </TableCell>
                      <TableCell sx={{ width: "150px", minWidth: "150px", maxWidth: "150px" }}>
                        {normalizeStoreId(
                          truck.storeId ? (typeof truck.storeId === 'string' || truck.storeId instanceof String 
                            ? String(truck.storeId) 
                            : String(truck.storeId)) : null
                        )}
                      </TableCell>
                      <TableCell align="right" sx={{ width: "150px", minWidth: "150px", maxWidth: "150px" }}>
                        <Button 
                          size="small" 
                          variant="outlined" 
                          onClick={() => handleViewDetail(truck)}
                        >
                          {t("View Detail")}
                        </Button>
                      </TableCell>
                    </TableRow>
                  ))
                )}
              </TableBody>
            </Table>
            <TablePagination
              component="div"
              count={filteredRows.length}
              page={page}
              onPageChange={handlePageChange}
              rowsPerPage={rowsPerPage}
              onRowsPerPageChange={handleRowsPerPageChange}
              rowsPerPageOptions={[5, 10, 25, 50]}
            />
          </TableContainer>
          )}
        </CardContent>
      </Card>

      {/* Add Truck Dialog */}
      <Dialog open={addDialogOpen} onClose={handleCloseAddDialog} maxWidth="sm" fullWidth>
        <DialogTitle>{t("Add New Truck Lane")}</DialogTitle>
        <DialogContent>
          <Box sx={{ pt: 2 }}>
            <Grid container spacing={2}>
              <Grid item xs={12}>
                <TextField
                  label={t("TruckLance Code")}
                  fullWidth
                  required
                  value={newTruck.truckLanceCode}
                  onChange={(e) => setNewTruck({ ...newTruck, truckLanceCode: e.target.value })}
                  disabled={saving}
                />
              </Grid>
              <Grid item xs={12}>
                <TextField
                  label={t("Departure Time")}
                  type="time"
                  fullWidth
                  required
                  value={newTruck.departureTime}
                  onChange={(e) => setNewTruck({ ...newTruck, departureTime: e.target.value })}
                  disabled={saving}
                  InputLabelProps={{
                    shrink: true,
                  }}
                  inputProps={{
                    step: 300, // 5 minutes
                  }}
                />
              </Grid>
              <Grid item xs={12}>
                <FormControl fullWidth>
                  <InputLabel>{t("Store ID")}</InputLabel>
                  <Select
                    value={newTruck.storeId}
                    label={t("Store ID")}
                    onChange={(e) => {
                      setNewTruck({ 
                        ...newTruck, 
                        storeId: e.target.value
                      });
                    }}
                    disabled={saving}
                  >
                    <MenuItem value="2F">2F</MenuItem>
                    <MenuItem value="4F">4F</MenuItem>
                  </Select>
                </FormControl>
              </Grid>
            </Grid>
          </Box>
        </DialogContent>
        <DialogActions>
          <Button onClick={handleCloseAddDialog} disabled={saving}>
            {t("Cancel")}
          </Button>
          <Button 
            onClick={handleCreateTruck} 
            variant="contained" 
            startIcon={<SaveIcon />}
            disabled={saving}
          >
            {saving ? t("Submitting...") : t("Save")}
          </Button>
        </DialogActions>
      </Dialog>

      {/* Snackbar for notifications */}
      <Snackbar
        open={snackbarOpen}
        autoHideDuration={6000}
        onClose={() => setSnackbarOpen(false)}
        anchorOrigin={{ vertical: 'top', horizontal: 'center' }}
      >
        <Alert 
          onClose={() => setSnackbarOpen(false)} 
          severity="warning" 
          sx={{ width: '100%' }}
        >
          {snackbarMessage}
        </Alert>
      </Snackbar>
    </Box>
  );
};

export default TruckLane;