"use client";

import React, { useCallback, useEffect, useMemo, useState } from "react";
import {
  Box,
  Button,
  Dialog,
  DialogActions,
  DialogContent,
  DialogTitle,
  Grid,
  Stack,
  Table,
  TableBody,
  TableCell,
  TableContainer,
  TableHead,
  TableRow,
  TextField,
  Typography,
  IconButton,
  CircularProgress,
} from "@mui/material";
import { useTranslation } from "react-i18next";
import { Add, Delete, Edit } from "@mui/icons-material";
import SearchBox, { Criterion } from "../SearchBox/SearchBox";
import SearchResults, { Column } from "../SearchResults/SearchResults";
import {
  saveItemQcCategoryMapping,
  deleteItemQcCategoryMapping,
  getItemQcCategoryMappings,
  fetchQcCategoriesForAll,
  fetchItemsForAll,
  getItemByCode,
} from "@/app/api/settings/qcItemAll/actions";
import {
  QcCategoryResult,
  ItemsResult,
} from "@/app/api/settings/qcItemAll";
import { ItemQcCategoryMappingInfo } from "@/app/api/settings/qcItemAll";
import {
  deleteDialog,
  errorDialogWithContent,
  submitDialog,
  successDialog,
} from "../Swal/CustomAlerts";

type SearchQuery = Partial<Omit<QcCategoryResult, "id">>;
type SearchParamNames = keyof SearchQuery;

const Tab0ItemQcCategoryMapping: React.FC = () => {
  const { t } = useTranslation("qcItemAll");
  const [qcCategories, setQcCategories] = useState<QcCategoryResult[]>([]);
  const [filteredQcCategories, setFilteredQcCategories] = useState<QcCategoryResult[]>([]);
  const [selectedCategory, setSelectedCategory] = useState<QcCategoryResult | null>(null);
  const [mappings, setMappings] = useState<ItemQcCategoryMappingInfo[]>([]);
  const [openDialog, setOpenDialog] = useState(false);
  const [openAddDialog, setOpenAddDialog] = useState(false);
  const [itemCode, setItemCode] = useState<string>("");
  const [validatedItem, setValidatedItem] = useState<ItemsResult | null>(null);
  const [itemCodeError, setItemCodeError] = useState<string>("");
  const [validatingItemCode, setValidatingItemCode] = useState<boolean>(false);
  const [selectedType, setSelectedType] = useState<string>("IQC");
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    const loadData = async () => {
      setLoading(true);
      try {
        // Only load categories list (same as Tab 2) - fast!
        const categories = await fetchQcCategoriesForAll();
        setQcCategories(categories || []);
        setFilteredQcCategories(categories || []);
      } catch (error) {
        console.error("Tab0: Error loading data:", error);
        setQcCategories([]);
        setFilteredQcCategories([]);
        if (error instanceof Error) {
          errorDialogWithContent(t("Error"), error.message, t);
        }
      } finally {
        setLoading(false);
      }
    };
    loadData();
  }, []);

  const handleViewMappings = useCallback(async (category: QcCategoryResult) => {
    setSelectedCategory(category);
    const mappingData = await getItemQcCategoryMappings(category.id);
    setMappings(mappingData);
    setOpenDialog(true);
  }, []);

  const handleAddMapping = useCallback(() => {
    if (!selectedCategory) return;
    setItemCode("");
    setValidatedItem(null);
    setItemCodeError("");
    setOpenAddDialog(true);
  }, [selectedCategory]);
  
  const handleItemCodeChange = useCallback(async (code: string) => {
    setItemCode(code);
    setValidatedItem(null);
    setItemCodeError("");
    
    if (!code || code.trim() === "") {
      return;
    }
    
    setValidatingItemCode(true);
    try {
      const item = await getItemByCode(code.trim());
      if (item) {
        setValidatedItem(item);
        setItemCodeError("");
      } else {
        setValidatedItem(null);
        setItemCodeError(t("Item code not found"));
      }
    } catch (error) {
      setValidatedItem(null);
      setItemCodeError(t("Error validating item code"));
    } finally {
      setValidatingItemCode(false);
    }
  }, [t]);

  const handleSaveMapping = useCallback(async () => {
    if (!selectedCategory || !validatedItem) return;

    await submitDialog(async () => {
      try {
        await saveItemQcCategoryMapping(
          validatedItem.id as number,
          selectedCategory.id,
          selectedType
        );
        // Close add dialog first
        setOpenAddDialog(false);
        setItemCode("");
        setValidatedItem(null);
        setItemCodeError("");
        // Reload mappings to update the view
        const mappingData = await getItemQcCategoryMappings(selectedCategory.id);
        setMappings(mappingData);
        // Show success message after closing dialogs
        await successDialog(t("Submit Success"), t);
        // Keep the view dialog open to show updated data
      } catch (error) {
        errorDialogWithContent(t("Submit Error"), String(error), t);
      }
    }, t);
  }, [selectedCategory, validatedItem, selectedType, t]);

  const handleDeleteMapping = useCallback(
    async (mappingId: number) => {
      if (!selectedCategory) return;

      deleteDialog(async () => {
        try {
          await deleteItemQcCategoryMapping(mappingId);
          await successDialog(t("Delete Success"), t);
        // Reload mappings
        const mappingData = await getItemQcCategoryMappings(selectedCategory.id);
        setMappings(mappingData);
        // No need to reload categories list - it doesn't change
        } catch (error) {
          errorDialogWithContent(t("Delete Error"), String(error), t);
        }
      }, t);
    },
    [selectedCategory, t]
  );

  const typeOptions = ["IQC", "IPQC", "OQC", "FQC"];

  const searchCriteria: Criterion<SearchParamNames>[] = useMemo(
    () => [
      { label: t("Code"), paramName: "code", type: "text" },
      { label: t("Name"), paramName: "name", type: "text" },
    ],
    [t]
  );

  const onReset = useCallback(() => {
    setFilteredQcCategories(qcCategories);
  }, [qcCategories]);

  const columnWidthSx = (width = "10%") => {
    return { width: width, whiteSpace: "nowrap" };
  };

  const columns = useMemo<Column<QcCategoryResult>[]>(
    () => [
      { name: "code", label: t("Qc Category Code"), sx: columnWidthSx("20%") },
      { name: "name", label: t("Qc Category Name"), sx: columnWidthSx("40%") },
      {
        name: "id",
        label: t("Actions"),
        onClick: (category) => handleViewMappings(category),
        buttonIcon: <Edit />,
        buttonIcons: {} as any,
        sx: columnWidthSx("10%"),
      },
    ],
    [t, handleViewMappings]
  );

  if (loading) {
    return (
      <Box sx={{ display: "flex", justifyContent: "center", alignItems: "center", minHeight: "200px" }}>
        <CircularProgress />
      </Box>
    );
  }

  return (
    <Box>
      <SearchBox
        criteria={searchCriteria}
        onSearch={(query) => {
          setFilteredQcCategories(
            qcCategories.filter(
              (qc) =>
                (!query.code || qc.code.toLowerCase().includes(query.code.toLowerCase())) &&
                (!query.name || qc.name.toLowerCase().includes(query.name.toLowerCase()))
            )
          );
        }}
        onReset={onReset}
      />
      <SearchResults<QcCategoryResult>
        items={filteredQcCategories}
        columns={columns}
      />

      {/* View Mappings Dialog */}
      <Dialog open={openDialog} onClose={() => setOpenDialog(false)} maxWidth="md" fullWidth>
        <DialogTitle>
          {t("Mapping Details")} - {selectedCategory?.name}
        </DialogTitle>
        <DialogContent>
          <Stack spacing={2} sx={{ mt: 1 }}>
            <Box sx={{ display: "flex", justifyContent: "flex-end" }}>
              <Button
                variant="contained"
                startIcon={<Add />}
                onClick={handleAddMapping}
              >
                {t("Add Mapping")}
              </Button>
            </Box>
            <TableContainer>
              <Table>
                <TableHead>
                  <TableRow>
                    <TableCell>{t("Item Code")}</TableCell>
                    <TableCell>{t("Item Name")}</TableCell>
                    <TableCell>{t("Type")}</TableCell>
                    <TableCell>{t("Actions")}</TableCell>
                  </TableRow>
                </TableHead>
                <TableBody>
                  {mappings.length === 0 ? (
                    <TableRow>
                      <TableCell colSpan={4} align="center">
                        {t("No mappings found")}
                      </TableCell>
                    </TableRow>
                  ) : (
                    mappings.map((mapping) => (
                      <TableRow key={mapping.id}>
                        <TableCell>{mapping.itemCode}</TableCell>
                        <TableCell>{mapping.itemName}</TableCell>
                        <TableCell>{mapping.type}</TableCell>
                        <TableCell>
                          <IconButton
                            color="error"
                            size="small"
                            onClick={() => handleDeleteMapping(mapping.id)}
                          >
                            <Delete />
                          </IconButton>
                        </TableCell>
                      </TableRow>
                    ))
                  )}
                </TableBody>
              </Table>
            </TableContainer>
          </Stack>
        </DialogContent>
        <DialogActions>
          <Button onClick={() => setOpenDialog(false)}>{t("Cancel")}</Button>
        </DialogActions>
      </Dialog>

      {/* Add Mapping Dialog */}
      <Dialog open={openAddDialog} onClose={() => setOpenAddDialog(false)} maxWidth="sm" fullWidth>
        <DialogTitle>{t("Add Mapping")}</DialogTitle>
        <DialogContent>
          <Stack spacing={2} sx={{ mt: 2 }}>
            <TextField
              label={t("Item Code")}
              value={itemCode}
              onChange={(e) => handleItemCodeChange(e.target.value)}
              error={!!itemCodeError}
              helperText={itemCodeError || (validatedItem ? `${validatedItem.code} - ${validatedItem.name}` : t("Enter item code to validate"))}
              fullWidth
              disabled={validatingItemCode}
              InputProps={{
                endAdornment: validatingItemCode ? <CircularProgress size={20} /> : null,
              }}
            />
            <TextField
              select
              label={t("Select Type")}
              value={selectedType}
              onChange={(e) => setSelectedType(e.target.value)}
              SelectProps={{
                native: true,
              }}
              fullWidth
            >
              {typeOptions.map((type) => (
                <option key={type} value={type}>
                  {type}
                </option>
              ))}
            </TextField>
          </Stack>
        </DialogContent>
        <DialogActions>
          <Button onClick={() => setOpenAddDialog(false)}>{t("Cancel")}</Button>
          <Button
            variant="contained"
            onClick={handleSaveMapping}
            disabled={!validatedItem}
          >
            {t("Save")}
          </Button>
        </DialogActions>
      </Dialog>
    </Box>
  );
};

export default Tab0ItemQcCategoryMapping;