import React, { useState, useEffect, useCallback, useRef } from "react";
import {
  Card,
  Title,
  Subtitle,
  Table,
  TableHead,
  TableHeaderCell,
  TableRow,
  TableCell,
  TableBody,
  Tab,
  Text,
  TabGroup,
  TabList,
  TabPanels,
  Metric,
  Grid,
  TabPanel,
  Select,
  SelectItem,
  Dialog,
  DialogPanel,
  Icon,
  TextInput,
  NumberInput,
} from "@tremor/react";

import { message } from "antd";
import { Modal } from "antd";

import {
  userInfoCall,
  userUpdateUserCall,
  getPossibleUserRoles,
  userListCall,
} from "./networking";
import { Badge, BadgeDelta, Button } from "@tremor/react";
import RequestAccess from "./request_model_access";
import CreateUser from "./create_user_button";
import EditUserModal from "./edit_user";
import Paragraph from "antd/es/skeleton/Paragraph";
import {
  PencilAltIcon,
  InformationCircleIcon,
  TrashIcon,
} from "@heroicons/react/outline";

import { userDeleteCall } from "./networking";
import { columns } from "./view_users/columns";
import { UserDataTable } from "./view_users/table";
import { UserInfo } from "./view_users/types";
import BulkCreateUsers from "./bulk_create_users_button";
import SSOSettings from "./SSOSettings";
import debounce from "lodash/debounce";

interface ViewUserDashboardProps {
  accessToken: string | null;
  token: string | null;
  keys: any[] | null;
  userRole: string | null;
  userID: string | null;
  teams: any[] | null;
  setKeys: React.Dispatch<React.SetStateAction<Object[] | null>>;
}

interface UserListResponse {
  users: any[] | null;
  total: number;
  page: number;
  page_size: number;
  total_pages: number;
}

interface CreateuserProps {
  userID: string;
  accessToken: string;
  teams: any[];
  possibleUIRoles: Record<string, Record<string, string>>;
  onUserCreated: () => Promise<void>;
}

interface FilterState {
  email: string;
  user_id: string;
  user_role: string;
  sso_user_id: string;
  team: string;
  model: string;
  min_spend: number | null;
  max_spend: number | null;
  sort_by: string;
  sort_order: 'asc' | 'desc';
}

const isLocal = process.env.NODE_ENV === "development";
const proxyBaseUrl = isLocal ? "http://localhost:4000" : null;
if (isLocal != true) {
  console.log = function() {};
}

const ViewUserDashboard: React.FC<ViewUserDashboardProps> = ({
  accessToken,
  token,
  keys,
  userRole,
  userID,
  teams,
  setKeys,
}) => {
  const [userListResponse, setUserListResponse] = useState<UserListResponse | null>(null);
  const [endUsers, setEndUsers] = useState<null | any[]>(null);
  const [currentPage, setCurrentPage] = useState(1);
  const [openDialogId, setOpenDialogId] = React.useState<null | number>(null);
  const [selectedItem, setSelectedItem] = useState<null | any>(null);
  const [editModalVisible, setEditModalVisible] = useState(false);
  const [selectedUser, setSelectedUser] = useState<UserInfo | null>(null);
  const [isDeleteModalOpen, setIsDeleteModalOpen] = useState(false);
  const [userToDelete, setUserToDelete] = useState<string | null>(null);
  const [possibleUIRoles, setPossibleUIRoles] = useState<
    Record<string, Record<string, string>>
  >({});
  const defaultPageSize = 25;
  const [searchTerm, setSearchTerm] = useState("");
  const [activeTab, setActiveTab] = useState("users");
  const [filters, setFilters] = useState<FilterState>({
    email: "",
    user_id: "",
    user_role: "",
    sso_user_id: "",
    team: "",
    model: "",
    min_spend: null,
    max_spend: null,
    sort_by: "created_at",
    sort_order: "desc"
  });
  const [showFilters, setShowFilters] = useState(false);
  const [showColumnDropdown, setShowColumnDropdown] = useState(false);
  const [selectedFilter, setSelectedFilter] = useState("Email");
  const filtersRef = useRef(null);
  const lastSearchTimestamp = useRef(0);

  // check if window is not undefined
  if (typeof window !== "undefined") {
    window.addEventListener("beforeunload", function () {
      // Clear session storage
      sessionStorage.clear();
    });
  }

  const handleDelete = (userId: string) => {
    setUserToDelete(userId);
    setIsDeleteModalOpen(true);
  };

  const handleFilterChange = (key: keyof FilterState, value: string | number | null) => {
    const newFilters = { ...filters, [key]: value };
    setFilters(newFilters);
    console.log("called from handleFilterChange - newFilters:", JSON.stringify(newFilters));
    debouncedSearch(newFilters);
  };

  const handleSortChange = (sortBy: string, sortOrder: 'asc' | 'desc') => {
    const newFilters = {
      ...filters,
      sort_by: sortBy,
      sort_order: sortOrder
    };
    setFilters(newFilters);
    debouncedSearch(newFilters);
  };

  // Create a debounced version of the search function
  const debouncedSearch = useCallback(
    debounce(async (filters: FilterState) => {
      if (!accessToken || !token || !userRole || !userID) {
        return;
      }

      const currentTimestamp = Date.now();
      lastSearchTimestamp.current = currentTimestamp;

      try {
        // Make the API call using userListCall with all filter parameters
        const data = await userListCall(
          accessToken,
          filters.user_id ? [filters.user_id] : null,
          1, // Reset to first page when searching
          defaultPageSize,
          filters.email || null,
          filters.user_role || null,
          filters.team || null,
          filters.sso_user_id || null,
          filters.sort_by,
          filters.sort_order
        );
        
        // Only update state if this is the most recent search
        if (currentTimestamp === lastSearchTimestamp.current) {
          if (data) {
            setUserListResponse(data);
            console.log("called from debouncedSearch filters:", JSON.stringify(filters));
            console.log("called from debouncedSearch data:", JSON.stringify(data));
          }
        }
      } catch (error) {
        console.error("Error searching users:", error);
      }
    }, 300),
    [accessToken, token, userRole, userID]
  );

  // Cleanup the debounced function on component unmount
  useEffect(() => {
    return () => {
      debouncedSearch.cancel();
    };
  }, [debouncedSearch]);

  const handleSearch = (value: string) => {
    setSearchTerm(value);
    if (value === "") {
      refreshUserData(); // Reset to original data when search is cleared
    } else {
      debouncedSearch(filters);
    }
  };

  const confirmDelete = async () => {
    if (userToDelete && accessToken) {
      try {
        await userDeleteCall(accessToken, [userToDelete]);
        message.success("User deleted successfully");
        // Update the user list after deletion
        if (userListResponse) {
          const updatedUserData = userListResponse.users?.filter(user => user.user_id !== userToDelete);
          setUserListResponse({ ...userListResponse, users: updatedUserData || [] });
        }
      } catch (error) {
        console.error("Error deleting user:", error);
        message.error("Failed to delete user");
      }
    }
    setIsDeleteModalOpen(false);
    setUserToDelete(null);
  };

  const cancelDelete = () => {
    setIsDeleteModalOpen(false);
    setUserToDelete(null);
  };

  const handleEditCancel = async () => {
    setSelectedUser(null);
    setEditModalVisible(false);
  };

  const handleEditSubmit = async (editedUser: any) => {
    console.log("inside handleEditSubmit:", editedUser);

    if (!accessToken || !token || !userRole || !userID) {
      return;
    }

    try {
      await userUpdateUserCall(accessToken, editedUser, null);
      message.success(`User ${editedUser.user_id} updated successfully`);
    } catch (error) {
      console.error("There was an error updating the user", error);
    }
    if (userListResponse) {
      const updatedUserData = userListResponse.users?.map((user) =>
        user.user_id === editedUser.user_id ? editedUser : user
      );
      setUserListResponse({ ...userListResponse, users: updatedUserData || [] });
    }
    setSelectedUser(null);
    setEditModalVisible(false);
    // Close the modal
  };

  const refreshUserData = async () => {
    console.log("called from refreshUserData");
    if (!accessToken || !token || !userRole || !userID) {
      return;
    }
    
    try {
      const userDataResponse = await userInfoCall(
        accessToken,
        null,
        userRole,
        true,
        currentPage,
        defaultPageSize
      );
      
      // Update session storage with new data
      sessionStorage.setItem(
        `userList_${currentPage}`,
        JSON.stringify(userDataResponse)
      );
      console.log("called from refreshUserData");
      setUserListResponse(userDataResponse);
    } catch (error) {
      console.error("Error refreshing user data:", error);
    }
  };

  const handlePageChange = async (newPage: number) => {
    if (!accessToken || !token || !userRole || !userID) {
      return;
    }
    
    try {
      const userDataResponse = await userListCall(
        accessToken,
        filters.user_id ? [filters.user_id] : null,
        newPage,
        defaultPageSize,
        filters.email || null,
        filters.user_role || null,
        filters.team || null,
        filters.sort_by,
        filters.sort_order
      );
      
      // Update session storage with new data
      sessionStorage.setItem(
        `userList_${newPage}`,
        JSON.stringify(userDataResponse)
      );
      
      setUserListResponse(userDataResponse);
      setCurrentPage(newPage);
    } catch (error) {
      console.error("Error changing page:", error);
    }
  };

  useEffect(() => {
    if (!accessToken || !token || !userRole || !userID) {
      return;
    }
    const fetchData = async () => {
      try {
        // Check session storage first
        const cachedUserData = sessionStorage.getItem(`userList_${currentPage}`);
        if (cachedUserData) {
          const parsedData = JSON.parse(cachedUserData);
          setUserListResponse(parsedData);
          console.log("called from useEffect");
        } else {
          // Fetch from API using userListCall with current filters
          const userDataResponse = await userListCall(
            accessToken,
            filters.user_id ? [filters.user_id] : null,
            currentPage,
            defaultPageSize,
            filters.email || null,
            filters.user_role || null,
            filters.team || null,
            filters.sort_by,
            filters.sort_order
          );

          // Store in session storage
          sessionStorage.setItem(
            `userList_${currentPage}`,
            JSON.stringify(userDataResponse)
          );

          setUserListResponse(userDataResponse);
          console.log("called from useEffect 2");
        }

        // Fetch roles if not cached
        const cachedRoles = sessionStorage.getItem('possibleUserRoles');
        if (cachedRoles) {
          setPossibleUIRoles(JSON.parse(cachedRoles));
        } else {
          const availableUserRoles = await getPossibleUserRoles(accessToken);
          sessionStorage.setItem('possibleUserRoles', JSON.stringify(availableUserRoles));
          setPossibleUIRoles(availableUserRoles);
        }
      } catch (error) {
        console.error("There was an error fetching the model data", error);
      }
    };

    if (accessToken && token && userRole && userID) {
      fetchData();
    }

  }, [accessToken, token, userRole, userID]);

  if (!userListResponse) {
    return <div>Loading...</div>;
  }

  if (!accessToken || !token || !userRole || !userID) {
    return <div>Loading...</div>;
  }

  const tableColumns = columns(
    possibleUIRoles,
    (user) => {
      setSelectedUser(user);
      setEditModalVisible(true);
    },
    handleDelete
  );

  return (
    <div className="w-full p-6">
      <div className="flex items-center justify-between mb-4">
        <h1 className="text-xl font-semibold">Users</h1>
        <div className="flex space-x-3">
          <CreateUser
            userID={userID}
            accessToken={accessToken}
            teams={teams}
            possibleUIRoles={possibleUIRoles}
          />
        </div>
      </div>
      
      <TabGroup defaultIndex={0} onIndexChange={(index) => setActiveTab(index === 0 ? "users" : "settings")}>
        <TabList className="mb-4">
          <Tab>Users</Tab>
          <Tab>Default User Settings</Tab>
        </TabList>
        
        <TabPanels>
          <TabPanel>
            <div className="bg-white rounded-lg shadow">
              <div className="border-b px-6 py-4">
                <div className="flex flex-col space-y-4">
                  {/* Search and Filter Controls */}
                  <div className="flex flex-wrap items-center gap-3">
                    {/* Email Search */}
                    <div className="relative w-64">
                      <input
                        type="text"
                        placeholder="Search by email..."
                        className="w-full px-3 py-2 pl-8 border rounded-md text-sm focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-blue-500"
                        value={filters.email}
                        onChange={(e) => handleFilterChange('email', e.target.value)}
                      />
                      <svg
                        className="absolute left-2.5 top-2.5 h-4 w-4 text-gray-500"
                        fill="none"
                        stroke="currentColor"
                        viewBox="0 0 24 24"
                      >
                        <path
                          strokeLinecap="round"
                          strokeLinejoin="round"
                          strokeWidth={2}
                          d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z"
                        />
                      </svg>
                    </div>

                    {/* Filter Button */}
                    <button
                      className={`px-3 py-2 text-sm border rounded-md hover:bg-gray-50 flex items-center gap-2 ${showFilters ? 'bg-gray-100' : ''}`}
                      onClick={() => setShowFilters(!showFilters)}
                    >
                      <svg
                        className="w-4 h-4"
                        fill="none"
                        stroke="currentColor"
                        viewBox="0 0 24 24"
                      >
                        <path
                          strokeLinecap="round"
                          strokeLinejoin="round"
                          strokeWidth={2}
                          d="M3 4a1 1 0 011-1h16a1 1 0 011 1v2.586a1 1 0 01-.293.707l-6.414 6.414a1 1 0 00-.293.707V17l-4 4v-6.586a1 1 0 00-.293-.707L3.293 7.293A1 1 0 013 6.586V4z"
                        />
                      </svg>
                      Filters
                      {(filters.user_id || filters.user_role || filters.team) && (
                        <span className="w-2 h-2 rounded-full bg-blue-500"></span>
                      )}
                    </button>

                    {/* Reset Filters Button */}
                    <button
                      className="px-3 py-2 text-sm border rounded-md hover:bg-gray-50 flex items-center gap-2"
                      onClick={() => {
                        setFilters({
                          email: "",
                          user_id: "",
                          user_role: "",
                          team: "",
                          sso_user_id: "",
                          model: "",
                          min_spend: null,
                          max_spend: null,
                          sort_by: "created_at",
                          sort_order: "desc"
                        });
                      }}
                    >
                      <svg
                        className="w-4 h-4"
                        fill="none"
                        stroke="currentColor"
                        viewBox="0 0 24 24"
                      >
                        <path
                          strokeLinecap="round"
                          strokeLinejoin="round"
                          strokeWidth={2}
                          d="M4 4v5h.582m15.356 2A8.001 8.001 0 004.582 9m0 0H9m11 11v-5h-.581m0 0a8.003 8.003 0 01-15.357-2m15.357 2H15"
                        />
                      </svg>
                      Reset Filters
                    </button>
                  </div>

                  {/* Additional Filters */}
                  {showFilters && (
                    <div className="flex flex-wrap items-center gap-3 mt-3">
                      {/* User ID Search */}
                      <div className="relative w-64">
                        <input
                          type="text"
                          placeholder="Filter by User ID"
                          className="w-full px-3 py-2 pl-8 border rounded-md text-sm focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-blue-500"
                          value={filters.user_id}
                          onChange={(e) => handleFilterChange('user_id', e.target.value)}
                        />
                        <svg
                          className="absolute left-2.5 top-2.5 h-4 w-4 text-gray-500"
                          fill="none"
                          stroke="currentColor"
                          viewBox="0 0 24 24"
                        >
                          <path
                            strokeLinecap="round"
                            strokeLinejoin="round"
                            strokeWidth={2}
                            d="M5.121 17.804A13.937 13.937 0 0112 16c2.5 0 4.847.655 6.879 1.804M15 10a3 3 0 11-6 0 3 3 0 016 0zm6 2a9 9 0 11-18 0 9 9 0 0118 0z"
                          />
                        </svg>
                      </div>

                      {/* Role Dropdown */}
                      <div className="w-64">
                        <Select
                          value={filters.user_role}
                          onValueChange={(value) => handleFilterChange('user_role', value)}
                          placeholder="Select Role"
                        >
                          {Object.entries(possibleUIRoles).map(([key, value]) => (
                            <SelectItem key={key} value={key}>
                              {value.ui_label}
                            </SelectItem>
                          ))}
                        </Select>
                      </div>

                      {/* Team Dropdown */}
                      <div className="w-64">
                        <Select
                          value={filters.team}
                          onValueChange={(value) => handleFilterChange('team', value)}
                          placeholder="Select Team"
                        >
                          {teams?.map((team) => (
                            <SelectItem key={team.team_id} value={team.team_id}>
                              {team.team_alias || team.team_id}
                            </SelectItem>
                          ))}
                        </Select>
                      </div>
                      
                      {/* SSO ID Search */}
                      <div className="relative w-64">
                        <input
                          type="text"
                          placeholder="Filter by SSO ID"
                          className="w-full px-3 py-2 pl-8 border rounded-md text-sm focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-blue-500"
                          value={filters.sso_user_id}
                          onChange={(e) => handleFilterChange('sso_user_id', e.target.value)}
                        />
                      </div>
                    </div>
                  )}

                  {/* Results Count and Pagination */}
                  <div className="flex justify-between items-center">
                    <span className="text-sm text-gray-700">
                      Showing{" "}
                      {userListResponse && userListResponse.users && userListResponse.users.length > 0
                        ? (userListResponse.page - 1) * userListResponse.page_size + 1
                        : 0}{" "}
                      -{" "}
                      {userListResponse && userListResponse.users
                        ? Math.min(
                            userListResponse.page * userListResponse.page_size,
                            userListResponse.total
                          )
                        : 0}{" "}
                      of {userListResponse ? userListResponse.total : 0} results
                    </span>
                    
                    {/* Pagination Buttons */}
                    <div className="flex space-x-2">
                      <button
                        onClick={() => handlePageChange(currentPage - 1)}
                        disabled={currentPage === 1}
                        className={`px-3 py-1 text-sm border rounded-md ${
                          currentPage === 1
                            ? 'bg-gray-100 text-gray-400 cursor-not-allowed'
                            : 'hover:bg-gray-50'
                        }`}
                      >
                        Previous
                      </button>
                      <button
                        onClick={() => handlePageChange(currentPage + 1)}
                        disabled={!userListResponse || currentPage >= userListResponse.total_pages}
                        className={`px-3 py-1 text-sm border rounded-md ${
                          !userListResponse || currentPage >= userListResponse.total_pages
                            ? 'bg-gray-100 text-gray-400 cursor-not-allowed'
                            : 'hover:bg-gray-50'
                        }`}
                      >
                        Next
                      </button>
                    </div>
                  </div>
                </div>
              </div>

              <UserDataTable
                data={userListResponse?.users || []}
                columns={tableColumns}
                isLoading={!userListResponse}
                onSortChange={handleSortChange}
                currentSort={{
                  sortBy: filters.sort_by,
                  sortOrder: filters.sort_order
                }}
              />
            </div>
          </TabPanel>
          
          <TabPanel>
            <SSOSettings accessToken={accessToken} possibleUIRoles={possibleUIRoles} userID={userID} userRole={userRole}/>
          </TabPanel>
        </TabPanels>
      </TabGroup>

      {/* Existing Modals */}
      <EditUserModal
        visible={editModalVisible}
        possibleUIRoles={possibleUIRoles}
        onCancel={handleEditCancel}
        user={selectedUser}
        onSubmit={handleEditSubmit}
      />

      {/* Delete Confirmation Modal */}
      {isDeleteModalOpen && (
        <div className="fixed z-10 inset-0 overflow-y-auto">
          <div className="flex items-end justify-center min-h-screen pt-4 px-4 pb-20 text-center sm:block sm:p-0">
            <div
              className="fixed inset-0 transition-opacity"
              aria-hidden="true"
            >
              <div className="absolute inset-0 bg-gray-500 opacity-75"></div>
            </div>

            {/* Modal Panel */}
            <span
              className="hidden sm:inline-block sm:align-middle sm:h-screen"
              aria-hidden="true"
            >
              &#8203;
            </span>

            {/* Confirmation Modal Content */}
            <div className="inline-block align-bottom bg-white rounded-lg text-left overflow-hidden shadow-xl transform transition-all sm:my-8 sm:align-middle sm:max-w-lg sm:w-full">
              <div className="bg-white px-4 pt-5 pb-4 sm:p-6 sm:pb-4">
                <div className="sm:flex sm:items-start">
                  <div className="mt-3 text-center sm:mt-0 sm:ml-4 sm:text-left">
                    <h3 className="text-lg leading-6 font-medium text-gray-900">
                      Delete User
                    </h3>
                    <div className="mt-2">
                      <p className="text-sm text-gray-500">
                        Are you sure you want to delete this user?
                      </p>
                      <p className="text-sm font-medium text-gray-900 mt-2">
                        User ID: {userToDelete}
                      </p>
                    </div>
                  </div>
                </div>
              </div>
              <div className="bg-gray-50 px-4 py-3 sm:px-6 sm:flex sm:flex-row-reverse">
                <Button onClick={confirmDelete} color="red" className="ml-2">
                  Delete
                </Button>
                <Button onClick={cancelDelete}>Cancel</Button>
              </div>
            </div>
          </div>
        </div>
      )}
    </div>
  );
};

export default ViewUserDashboard;