import { InventoryLotLineResult, InventoryResult } from "@/app/api/inventory";
import { Dispatch, SetStateAction, useCallback, useEffect, useMemo, useState } from "react";
import { useTranslation } from "react-i18next";
import { Column } from "../SearchResults";
import SearchResults, { defaultPagingController, defaultSetPagingController } from "../SearchResults/SearchResults";
import { arrayToDateString } from "@/app/utils/formatUtil";
import { Box, Card, Grid, IconButton, Modal, TextField, Typography, Button } from "@mui/material";
import useUploadContext from "../UploadProvider/useUploadContext";
import { downloadFile } from "@/app/utils/commonUtil";
import { fetchQrCodeByLotLineId, LotLineToQrcode } from "@/app/api/pdf/actions";
import QrCodeIcon from "@mui/icons-material/QrCode";
import PrintIcon from "@mui/icons-material/Print";
import SwapHoriz from "@mui/icons-material/SwapHoriz";
import CloseIcon from "@mui/icons-material/Close";
import { Autocomplete } from "@mui/material";
import { WarehouseResult } from "@/app/api/warehouse";
import { fetchWarehouseListClient } from "@/app/api/warehouse/client";
import { updateInventoryLotLineQuantities } from "@/app/api/inventory/actions";

interface Props {
    inventoryLotLines: InventoryLotLineResult[] | null;
    setPagingController: defaultSetPagingController;
    pagingController: typeof defaultPagingController;
    totalCount: number;
    inventory: InventoryResult | null;
}

const InventoryLotLineTable: React.FC<Props> = ({ inventoryLotLines, pagingController, setPagingController, totalCount, inventory }) => {
    const { t } = useTranslation(["inventory"]);
    const { setIsUploading } = useUploadContext();
    const [stockTransferModalOpen, setStockTransferModalOpen] = useState(false);
    const [selectedLotLine, setSelectedLotLine] = useState<InventoryLotLineResult | null>(null);
    const [startLocation, setStartLocation] = useState<string>("");
    const [targetLocation, setTargetLocation] = useState<string>("");
    const [targetLocationInput, setTargetLocationInput] = useState<string>("");
    const [qtyToBeTransferred, setQtyToBeTransferred] = useState<number>(0);
    const [warehouses, setWarehouses] = useState<WarehouseResult[]>([]);

    useEffect(() => {
        if (stockTransferModalOpen) {
            fetchWarehouseListClient()
                .then(setWarehouses)
                .catch(console.error);
        }
    }, [stockTransferModalOpen]);

    const originalQty = selectedLotLine?.availableQty || 0;
    const remainingQty = originalQty - qtyToBeTransferred;

    const downloadQrCode = useCallback(async (lotLineId: number) => {
      setIsUploading(true);
      // const postData = { stockInLineIds: [42,43,44] };
      const postData: LotLineToQrcode = {
        inventoryLotLineId: lotLineId
      }
      const response = await fetchQrCodeByLotLineId(postData);
      if (response) {
        downloadFile(new Uint8Array(response.blobValue), response.filename!);
      }
      setIsUploading(false);
    }, [setIsUploading]);
    
    const handleStockTransfer = useCallback(
      (lotLine: InventoryLotLineResult) => {
        setSelectedLotLine(lotLine);
        setStockTransferModalOpen(true);
        setStartLocation(lotLine.warehouse.code || "");
        setTargetLocation("");
        setTargetLocationInput("");
        setQtyToBeTransferred(0);
      },
      [],
    );

    const onDetailClick = useCallback(
      (lotLine: InventoryLotLineResult) => {
        downloadQrCode(lotLine.id)
        // lot line id to find stock in line
      },
      [downloadQrCode],
    );
    const columns = useMemo<Column<InventoryLotLineResult>[]>(
        () => [
            // {
            //     name: "item",
            //     label: t("Code"),
            //     renderCell: (params) => {
            //         return params.item.code;
            //     },
            // },
            // {
            //     name: "item",
            //     label: t("Name"),
            //     renderCell: (params) => {
            //         return params.item.name;
            //     },
            // },
            {
                name: "lotNo",
                label: t("Lot No"),
            },
            // {
            //     name: "item",
            //     label: t("Type"),
            //     renderCell: (params) => {
            //         return t(params.item.type);
            //     },
            // },
            {
                name: "availableQty",
                label: t("Available Qty"),
                align: "right",
                headerAlign: "right",
                type: "integer",
            },
            {
                name: "uom",
                label: t("Stock UoM"),
                align: "left",
                headerAlign: "left",
            },
            // {
            //     name: "qtyPerSmallestUnit",
            //     label: t("Available Qty Per Smallest Unit"),
            //     align: "right",
            //     headerAlign: "right",
            //     type: "integer",
            // },
            // {
            //     name: "baseUom",
            //     label: t("Base UoM"),
            //     align: "left",
            //     headerAlign: "left",
            // },
            {
                name: "expiryDate",
                label: t("Expiry Date"),
                renderCell: (params) => {
                    return arrayToDateString(params.expiryDate)
                },
            },
            {
                name: "warehouse",
                label: t("Warehouse"),
                renderCell: (params) => {
                    return `${params.warehouse.code}`
                },
            },
            {
                name: "id",
                label: t("Download QR Code"),
                onClick: onDetailClick,
                buttonIcon: <QrCodeIcon />,
                align: "center",
                headerAlign: "center",
            },
            {
                name: "id",
                label: t("Print QR Code"),
                onClick: () => {},
                buttonIcon: <PrintIcon />,
                align: "center",
                headerAlign: "center",
            },
            {
                name: "id",
                label: t("Stock Transfer"),
                onClick: handleStockTransfer,
                buttonIcon: <SwapHoriz />,
                align: "center",
                headerAlign: "center",
            },
            // {
            //     name: "status",
            //     label: t("Status"),
            //     type: "icon",
            //     icons: {
            //         available: <CheckCircleOutline fontSize="small"/>,
            //         unavailable: <DoDisturb fontSize="small"/>,
            //     },
            //     colors: {
            //         available: "success",
            //         unavailable: "error",
            //     }
            // },
        ],
        [t, onDetailClick, downloadQrCode, handleStockTransfer],
    );

    const handleCloseStockTransferModal = useCallback(() => {
        setStockTransferModalOpen(false);
        setSelectedLotLine(null);
        setStartLocation("");
        setTargetLocation("");
        setTargetLocationInput("");
        setQtyToBeTransferred(0);
    }, []);

    const handleSubmitStockTransfer = useCallback(async () => {
        try {
            setIsUploading(true);
            
            // Decrease the inQty (availableQty) in the source inventory lot line


            // TODO: Add logic to increase qty in target location warehouse
            
            alert(t("Stock transfer successful"));
            handleCloseStockTransferModal();
            
            // TODO: Refresh the inventory lot lines list
            } catch (error: any) {
                console.error("Error transferring stock:", error);
                alert(error?.message || t("Failed to transfer stock. Please try again."));
            } finally {
                setIsUploading(false);
        }
    }, [selectedLotLine, targetLocation, qtyToBeTransferred, originalQty, handleCloseStockTransferModal, setIsUploading, t]);

    return <>
    <Typography variant="h6">{inventory ? `${t("Item selected")}: ${inventory.itemCode} | ${inventory.itemName} (${t(inventory.itemType)})` : t("No items are selected yet.")}</Typography>
    <SearchResults<InventoryLotLineResult>
        items={inventoryLotLines ?? []}
        columns={columns}
        pagingController={pagingController}
        setPagingController={setPagingController}
        totalCount={totalCount}
    />
    
    <Modal
      open={stockTransferModalOpen}
      onClose={handleCloseStockTransferModal}
      sx={{
        display: 'flex',
        alignItems: 'center',
        justifyContent: 'center',
      }}
    >
      <Card
        sx={{
          position: 'relative',
          width: '95%',
          maxWidth: '1200px',
          maxHeight: '90vh',
          overflow: 'auto',
          p: 3,
        }}
      >
        <Box sx={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', mb: 2 }}>
          <Typography variant="h6">
            {inventory && selectedLotLine 
              ? `${inventory.itemCode} ${inventory.itemName} (${selectedLotLine.lotNo})`
              : t("Stock Transfer")
            }
          </Typography>
          <IconButton onClick={handleCloseStockTransferModal}>
            <CloseIcon />
          </IconButton>
        </Box>
        <Grid container spacing={1} sx={{ mt: 2 }}>
        <Grid item xs={5.5}>
            <TextField
                label={t("Start Location")}
                fullWidth
                variant="outlined"
                value={startLocation}
                disabled
                InputLabelProps={{
                    shrink: !!startLocation,
                    sx: { fontSize: "0.9375rem" },
                }}
            />
        </Grid>
        <Grid item xs={1} sx={{ display: 'flex', alignItems: 'center', justifyContent: 'center' }}>
            <Typography variant="body1">{t("to")}</Typography>
        </Grid>
        <Grid item xs={5.5}>
        <Autocomplete
            options={warehouses.filter(w => w.code !== startLocation)}
            getOptionLabel={(option) => option.code || ""}
            value={targetLocation ? warehouses.find(w => w.code === targetLocation) || null : null}
            inputValue={targetLocationInput}
            onInputChange={(event, newInputValue) => {
                setTargetLocationInput(newInputValue);
                if (targetLocation && newInputValue !== targetLocation) {
                    setTargetLocation("");
                }
            }}
            onChange={(event, newValue) => {
                if (newValue) {
                    setTargetLocation(newValue.code);
                    setTargetLocationInput(newValue.code);
                } else {
                    setTargetLocation("");
                    setTargetLocationInput("");
                }
            }}
            filterOptions={(options, { inputValue }) => {
                if (!inputValue || inputValue.trim() === "") return options;
                const searchTerm = inputValue.toLowerCase().trim();
                return options.filter((option) =>
                    (option.code || "").toLowerCase().includes(searchTerm) ||
                    (option.name || "").toLowerCase().includes(searchTerm) ||
                    (option.description || "").toLowerCase().includes(searchTerm)
                );
            }}
            isOptionEqualToValue={(option, value) => option.code === value.code}
            autoHighlight={false}
            autoSelect={false}
            clearOnBlur={false}
            renderOption={(props, option) => (
                <li {...props}>
                    {option.code}
                </li>
            )}
            renderInput={(params) => (
                <TextField
                    {...params}
                    label={t("Target Location")}
                    variant="outlined"
                    fullWidth
                    InputLabelProps={{
                        shrink: !!targetLocation || !!targetLocationInput,
                        sx: { fontSize: "0.9375rem" },
                    }}
                />
            )}
        />
        </Grid>
        </Grid>
        <Grid container spacing={1} sx={{ mt: 2 }}>
            <Grid item xs={2}>
                <TextField
                    label={t("Original Qty")}
                    fullWidth
                    variant="outlined"
                    value={originalQty}
                    disabled
                    InputLabelProps={{
                        shrink: true,
                        sx: { fontSize: "0.9375rem" },
                    }}
                />
            </Grid>
            <Grid item xs={1} sx={{ display: 'flex', alignItems: 'center', justifyContent: 'center' }}>
                <Typography variant="body1">-</Typography>
            </Grid>
            <Grid item xs={2}>
                <TextField
                    label={t("Qty To Be Transferred")}
                    fullWidth
                    variant="outlined"
                    type="number"
                    value={qtyToBeTransferred}
                    onChange={(e) => {
                        const value = parseInt(e.target.value) || 0;
                        const maxValue = Math.max(0, originalQty);
                        setQtyToBeTransferred(Math.min(Math.max(0, value), maxValue));
                    }}
                    inputProps={{ min: 0, max: originalQty, step: 1 }}
                    InputLabelProps={{
                        shrink: true,
                        sx: { fontSize: "0.9375rem" },
                    }}
                />
            </Grid>
            <Grid item xs={1} sx={{ display: 'flex', alignItems: 'center', justifyContent: 'center' }}>
                <Typography variant="body1">=</Typography>
            </Grid>
            <Grid item xs={2}>
                <TextField
                    label={t("Remaining Qty")}
                    fullWidth
                    variant="outlined"
                    value={remainingQty}
                    disabled
                    InputLabelProps={{
                        shrink: true,
                        sx: { fontSize: "0.9375rem" },
                    }}
                />
            </Grid>
            <Grid item xs={2}>
                <TextField
                    label={t("Stock UoM")}
                    fullWidth
                    variant="outlined"
                    value={selectedLotLine?.uom || ""}
                    disabled
                    InputLabelProps={{
                        shrink: true,
                        sx: { fontSize: "0.9375rem" },
                    }}
                />
            </Grid>
            <Grid item xs={2} sx={{ display: 'flex', alignItems: 'center' }}>
                <Button
                    variant="contained"
                    fullWidth
                    sx={{ 
                        height: '56px',
                        fontSize: '0.9375rem',
                    }}
                    onClick={handleSubmitStockTransfer}
                    disabled={!selectedLotLine || !targetLocation || qtyToBeTransferred <= 0 || qtyToBeTransferred > originalQty}
                >
                    {t("Submit")}
                </Button>
            </Grid>
        </Grid>
      </Card> 
    </Modal>

    </>
}

export default InventoryLotLineTable;