'use client';

import { useUsers, useDeleteUser } from '@/hooks/use-users';
import { useOrganizations } from '@/hooks/use-master-data';
import { Button } from '@/components/ui/button';
import { DataTable } from '@/components/common/data-table';
import { Plus, MoreHorizontal, Pencil, Trash, Search } from 'lucide-react';
import { useState } from 'react';
import { UserDialog } from '@/components/admin/user-dialog';
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuTrigger,
} from '@/components/ui/dropdown-menu';
import { Badge } from '@/components/ui/badge';
import { ColumnDef } from '@tanstack/react-table';
import { User } from '@/types/user';
import { Input } from '@/components/ui/input';
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select';
import {
  AlertDialog,
  AlertDialogAction,
  AlertDialogCancel,
  AlertDialogContent,
  AlertDialogDescription,
  AlertDialogFooter,
  AlertDialogHeader,
  AlertDialogTitle,
} from '@/components/ui/alert-dialog';
import { Skeleton } from '@/components/ui/skeleton';

import { Organization } from '@/types/organization';
import { getApiErrorMessage } from '@/types/api-error';

export default function UsersPage() {
  const [search, setSearch] = useState('');
  const [selectedOrgId, setSelectedOrgId] = useState<string | null>(null);

  const {
    data: users,
    isLoading,
    isError,
    error,
  } = useUsers({
    search: search || undefined,
    primaryOrganizationId: selectedOrgId ?? undefined,
  });

  const { data: organizations = [] } = useOrganizations();
  const userList = Array.isArray(users) ? users : [];
  const organizationList: Organization[] = Array.isArray(organizations) ? organizations : [];

  const deleteMutation = useDeleteUser();
  const [dialogOpen, setDialogOpen] = useState(false);
  const [selectedUser, setSelectedUser] = useState<User | null>(null);

  // Stats for Delete Dialog
  const [deleteDialogOpen, setDeleteDialogOpen] = useState(false);
  const [userToDelete, setUserToDelete] = useState<User | null>(null);

  const handleDeleteClick = (user: User) => {
    setUserToDelete(user);
    setDeleteDialogOpen(true);
  };

  const confirmDelete = () => {
    if (userToDelete) {
      deleteMutation.mutate(userToDelete.uuid, {
        onSuccess: () => {
          setDeleteDialogOpen(false);
          setUserToDelete(null);
        },
      });
    }
  };

  const columns: ColumnDef<User>[] = [
    {
      accessorKey: 'username',
      header: 'Username',
      cell: ({ row }) => <span className="font-semibold">{row.original.username}</span>,
    },
    {
      accessorKey: 'email',
      header: 'Email',
    },
    {
      id: 'name',
      header: 'Name',
      cell: ({ row }) => `${row.original.firstName} ${row.original.lastName}`,
    },
    {
      id: 'organization',
      header: 'Organization',
      cell: ({ row }) => {
        const orgId = row.original.primaryOrganizationId;
        if (!orgId) {
          return 'All Organizations';
        }

        const org = organizationList.find(
          (o) => (o.id ?? o.uuid) === orgId?.toString() || o.uuid === orgId?.toString()
        );
        return org ? org.organizationCode : 'All Organizations';
      },
    },
    {
      id: 'roles',
      header: 'Roles',
      cell: ({ row }) => {
        const roles = row.original.roles || [];
        return (
          <div className="flex flex-wrap gap-1">
            {roles.map((r) => (
              <Badge key={r.roleId} variant="outline" className="text-xs">
                {r.roleName}
              </Badge>
            ))}
          </div>
        );
      },
    },
    {
      accessorKey: 'isActive',
      header: 'Status',
      cell: ({ row }) => (
        <Badge variant={row.original.isActive ? 'default' : 'secondary'}>
          {row.original.isActive ? 'Active' : 'Inactive'}
        </Badge>
      ),
    },
    {
      id: 'actions',
      header: 'Actions',
      cell: ({ row }) => {
        const user = row.original;
        return (
          <DropdownMenu>
            <DropdownMenuTrigger asChild>
              <Button variant="ghost" className="h-8 w-8 p-0">
                <span className="sr-only">Open menu</span>
                <MoreHorizontal className="h-4 w-4" />
              </Button>
            </DropdownMenuTrigger>
            <DropdownMenuContent align="end">
              <DropdownMenuItem
                onClick={() => {
                  setSelectedUser(user);
                  setDialogOpen(true);
                }}
              >
                <Pencil className="mr-2 h-4 w-4" /> Edit
              </DropdownMenuItem>
              <DropdownMenuItem className="text-red-600 focus:text-red-600" onClick={() => handleDeleteClick(user)}>
                <Trash className="mr-2 h-4 w-4" /> Delete
              </DropdownMenuItem>
            </DropdownMenuContent>
          </DropdownMenu>
        );
      },
    },
  ];

  return (
    <div className="space-y-6 p-6">
      <div className="flex justify-between items-center">
        <div>
          <h1 className="text-3xl font-bold">User Management</h1>
          <p className="text-muted-foreground mt-1">Manage system users and roles</p>
        </div>
        <Button
          onClick={() => {
            setSelectedUser(null);
            setDialogOpen(true);
          }}
        >
          <Plus className="mr-2 h-4 w-4" /> Add User
        </Button>
      </div>

      <div className="flex gap-4 items-center bg-muted/30 p-4 rounded-lg">
        <div className="relative flex-1 max-w-sm">
          <Search className="absolute left-2.5 top-2.5 h-4 w-4 text-muted-foreground" />
          <Input
            placeholder="Search users..."
            value={search}
            onChange={(e) => setSearch(e.target.value)}
            className="pl-8 bg-background"
          />
        </div>
        <div className="w-[250px]">
          <Select value={selectedOrgId || 'all'} onValueChange={(val) => setSelectedOrgId(val === 'all' ? null : val)}>
            <SelectTrigger className="bg-background">
              <SelectValue placeholder="All Organizations" />
            </SelectTrigger>
            <SelectContent>
              <SelectItem value="all">All Organizations</SelectItem>
              {organizationList.map((org) => (
                <SelectItem key={org.uuid} value={org.uuid}>
                  {org.organizationCode} - {org.organizationName}
                </SelectItem>
              ))}
            </SelectContent>
          </Select>
        </div>
      </div>

      {isError && (
        <div className="rounded-md border border-destructive/30 bg-destructive/5 px-4 py-3 text-sm text-destructive">
          {getApiErrorMessage(error, 'Failed to load users')}
        </div>
      )}

      {isLoading ? (
        <div className="space-y-2">
          {[1, 2, 3, 4, 5].map((i) => (
            <div key={i} className="flex items-center space-x-4">
              <Skeleton className="h-12 w-full" />
            </div>
          ))}
        </div>
      ) : (
        <DataTable columns={columns} data={userList} />
      )}

      <UserDialog open={dialogOpen} onOpenChange={setDialogOpen} user={selectedUser} />

      <AlertDialog open={deleteDialogOpen} onOpenChange={setDeleteDialogOpen}>
        <AlertDialogContent>
          <AlertDialogHeader>
            <AlertDialogTitle>Are you absolutely sure?</AlertDialogTitle>
            <AlertDialogDescription>
              This action cannot be undone. This will permanently delete the user
              <span className="font-semibold text-foreground"> {userToDelete?.username} </span>
              and remove them from the system.
            </AlertDialogDescription>
          </AlertDialogHeader>
          <AlertDialogFooter>
            <AlertDialogCancel>Cancel</AlertDialogCancel>
            <AlertDialogAction onClick={confirmDelete} className="bg-red-600 hover:bg-red-700">
              {deleteMutation.isPending ? 'Deleting...' : 'Delete User'}
            </AlertDialogAction>
          </AlertDialogFooter>
        </AlertDialogContent>
      </AlertDialog>
    </div>
  );
}