"use client";

import { useCallback, useEffect } from "react";
import { useForm } from "react-hook-form";
import { zodResolver } from "@hookform/resolvers/zod";
import { useRouter } from "next/navigation";

import Input from "@/src/components/admin/form/input/InputField";
import Label from "@/src/components/admin/form/Label";
import Form from "@/src/components/admin/form/Form";
import FormGroup from "@/src/components/admin/form/FormGroup";

import { useToastMessage } from "@/src/hooks/admin/useToastMessage";
import { useStateContext } from "@/src/context/admin/StateContext";
import { useUniqueCheck } from "@/src/hooks/admin/useUniqueCheck";

import {
  submitDepartment,
  uniqueDepartment,
  getDepartmentById,
} from "@/src/services/admin/services";

import {
  departmentSchema,
  DepartmentFormData,
} from "@/src/validation/admin/validation";
import { useFetchById } from "@/src/hooks/admin/useFetchById";

interface AddDepartmentFormProps {
  onFormSubmit?: () => void;
}

export default function AddDepartmentForm({
  onFormSubmit,
}: AddDepartmentFormProps) {
    const router = useRouter();
  const { itemID, setItemID , setRefresh , setIsDrawerOpen, refresh , isDrawerOpen } = useStateContext();
  const { message, setMessage } = useToastMessage();

  const {
    register,
    handleSubmit,
    reset,
    watch,
    setValue,
    formState: { errors, isSubmitting },
  } = useForm<DepartmentFormData>({
    resolver: zodResolver(departmentSchema),
    defaultValues: {
      department_name: "",
    },
  });

  /* =======================
     Unique Check
  ======================= */

  const { isUnique, error, checkUnique } = useUniqueCheck(
    uniqueDepartment,
    800
  );

  const departmentName = watch("department_name");

  useEffect(() => {
    if (!departmentName?.trim()) return;
    checkUnique(departmentName.trim(), itemID);
  }, [departmentName, itemID, checkUnique]);

  /* =======================
     Fetch (Edit Mode)
  ======================= */

  const setFormData = useCallback((data: any) => {
    reset({
      department_name: data?.department_name || "",
    });
  }, [reset]);

  const fetchService = useCallback(async (itemID: number) => {
    const res = await getDepartmentById(itemID);
    return res.data.data;
  }, []);

  useFetchById({
    fetchService,
    setFormData,
    onError: (err) => console.error(err),
  });

  /* =======================
     Submit
  ======================= */

  const onSubmit = async (data: DepartmentFormData) => {
    if (isUnique === false) {
      setMessage({
        type: "error",
        text: "Department already exists.",
      });
      return;
    }

    setMessage(null);

    try {
      const res = await submitDepartment(itemID, {
        department_name: data.department_name.trim(),
      });

      if (!res.data.success) {
        throw new Error(res.data.message);
      }

      setMessage({
        type: "success",
        text: itemID
          ? "Department updated successfully!"
          : "Department added successfully!",
      });

      reset({ department_name: "" });
      setTimeout(() => {
        setRefresh(!refresh);
        setIsDrawerOpen(false);
        setItemID(undefined);   
      }, 200);

      onFormSubmit?.();
      
    } catch (err: any) {
      setMessage({
        type: "error",
        text: err?.response?.data?.message || err.message,
      });
    }
  };

  /* =======================
     Render
  ======================= */

  return (
    <Form
      onSubmit={handleSubmit(onSubmit)}
      className="space-y-1"
      message={message || undefined}
      isSubmitting={isSubmitting}
    >
      <FormGroup>
        <Label required>Department Name</Label>
        <Input
          placeholder="Enter department name"
          {...register("department_name")}
          error={!!errors.department_name || isUnique === false}
          errorMessage={
            errors.department_name?.message ||
            (isUnique === false
              ? "Department already exists"
              : undefined) ||
            (error ? "Error checking uniqueness" : undefined)
          }
          hint="e.g., Finance, HR, Operations"
        />
      </FormGroup>
    </Form>
  );
}