import React, {
  useState,
  createContext,
  useEffect,
  useContext,
  useCallback,
  useMemo,
} from "react";
import { useForm } from "react-hook-form";
import { zodResolver } from "@hookform/resolvers/zod";
import { useNavigate } from "react-router-dom";
import { useDispatch } from "react-redux";

// ------ Components -------
import Breadcrumb from "../../components/common/Breadcrumb";
import TenantsList from "../../components/Tenant/TenantsList";
import TenantFilterPanel from "../../components/Tenant/TenantFilterPanel";

// ------ Context & Utils -------
import { useDebounce } from "../../utils/appUtils";
import { useFab } from "../../Context/FabContext";
import { setCurrentTenant } from "../../slices/globalVariablesSlice";
import { hasUserPermission } from "../../utils/authUtils";

// ------ Schema -------
import {
  defaultFilterValues,
  filterSchema,
} from "../../components/Tenant/TenantSchema";

// ------ Constants -------
import {
  MANAGE_TENANTS,
  SUPPER_TENANT,
  VIEW_TENANTS,
} from "../../utils/constants";
import { useProfile } from "../../hooks/useProfile";

// ---------- Context ----------
export const TenantContext = createContext();
export const useTenantContext = () => {
  const context = useContext(TenantContext);
  if (!context) {
    throw new Error(
      "useTenantContext must be used within a TenantContext.Provider"
    );
  }
  return context;
};

const TenantPage = () => {
  const dispatch = useDispatch();
  const navigate = useNavigate();
  const { profile } = useProfile();

  // ---------- State ----------
  const [searchText, setSearchText] = useState("");
  const [isRefetching, setIsRefetching] = useState(false);
  const [refetchFn, setRefetchFn] = useState(null);
  const [filters, setFilters] = useState();

  // ---------- Hooks ----------
  const debouncedSearch = useDebounce(searchText, 500);
  const { setOffcanvasContent, setShowTrigger } = useFab();

  const isSuperTenant = hasUserPermission(SUPPER_TENANT);
  const canManageTenants = hasUserPermission(MANAGE_TENANTS);
  const isSelfTenant = hasUserPermission(VIEW_TENANTS);

  const methods = useForm({
    resolver: zodResolver(filterSchema),
    defaultValues: defaultFilterValues,
  });
  const { reset } = methods;

  const handleApplyFilters = useCallback((values) => {
    setFilters(values);
  }, []);

  const filterPanelElement = useMemo(
    () => <TenantFilterPanel onApply={handleApplyFilters} />,
    [handleApplyFilters]
  );
console.log(isSelfTenant)
  // ---------- Fab Filter Panel ----------
  useEffect(() => {
    if (!isSuperTenant) return;
    setShowTrigger(true);
    setOffcanvasContent("Tenant Filters", filterPanelElement);

    return () => {
      setShowTrigger(false);
      setOffcanvasContent("", null);
    };
  }, [isSuperTenant, filterPanelElement, profile]);

  // ---------- Redirect for Self Tenant ----------
  useEffect(() => {
    if (!isSuperTenant && isSelfTenant) {
      // Delay navigation to next tick to avoid "update during render" warning
      setTimeout(() => {
        navigate("/tenant/self");
      }, 0);
    }
  }, [isSuperTenant, isSelfTenant, navigate]);

  // ---------- Handlers ----------
  const handleNewTenant = () => {
    dispatch(setCurrentTenant(null));
    navigate("/tenants/new-tenant");
  };

  // ---------- Context Value ----------
  const contextValue = {};

  return (
    <TenantContext.Provider value={contextValue}>
      <div className="container-fluid">
        <Breadcrumb
          data={[
            { label: "Home", link: "/dashboard" },
            { label: "Tenant", link: null },
          ]}
        />

        {/* Super Tenant Actions */}
        {isSuperTenant && (
          <div className="card d-flex p-2">
            <div className="row align-items-center">
              {/* Search */}
              <div className="col-6 col-md-6 col-lg-3 mb-md-0">
                <input
                  type="search"
                  value={searchText}
                  onChange={(e) => setSearchText(e.target.value)}
                  className="form-control form-control-sm"
                  placeholder="Search Tenant"
                />
              </div>

              {/* Actions */}
              <div className="col-6 col-md-6 col-lg-9 text-end">
                <span
                  className="text-tiny text-muted p-1 border-0 bg-none lead mx-3 cursor-pointer"
                  disabled={isRefetching}
                  onClick={() => refetchFn && refetchFn()}
                >
                  Refresh{" "}
                  <i
                    className={`bx bx-refresh ms-1 ${
                      isRefetching ? "bx-spin" : ""
                    }`}
                  ></i>
                </span>

                <button
                  type="button"
                  title="Add New Tenant"
                  className="p-1 bg-primary rounded-circle cursor-pointer"
                  onClick={handleNewTenant}
                >
                  <i className="bx bx-plus fs-4 text-white"></i>
                </button>
              </div>
            </div>
          </div>
        )}

        {/* Tenant List or Access Denied */}
        {isSuperTenant ? (
          <TenantsList
            filters={filters}
            searchText={debouncedSearch}
            setIsRefetching={setIsRefetching}
            setRefetchFn={setRefetchFn}
          />
        ) : !isSelfTenant ? (
          <div className="card text-center my-4 p-2">
            <i className="fa-solid fa-triangle-exclamation fs-5"></i>
            <p>
              Access Denied: You don't have permission to perform this action!
            </p>
          </div>
        ) : null}
      </div>
    </TenantContext.Provider>
  );
};

export default TenantPage;