'use client';

import { useState, useEffect } from 'react';
import { Button } from '@/components/ui/button';
import { Card, CardHeader, CardTitle, CardContent } from "@/components/ui/card"
import strings from "@/strings.json"
import { UserPlus, CircleAlert } from "lucide-react"

export default function Users() {
  const [totalUsers, setTotalUsers] = useState(0);
  const [userCtCardError, setUserCtCardError] = useState(false);
  const [userCtCardLoading, setUserCtCardLoading] = useState(true);

  useEffect(() => {
    console.log(strings.logsCalculatingUserCt);
    (async () => {
      try {
        const username = document.cookie.split('; ').find(row => row.startsWith('username='))?.split('=')[1] || '';
        const key = document.cookie.split('; ').find(row => row.startsWith('key='))?.split('=')[1] || '';
        
        const res = await fetch(`http://localhost:3001/api/admin/users/totalUsers`, {
          method: 'POST',
          headers: {
            'Content-Type': 'application/json',
          },
          body: JSON.stringify({
            username,
            key
          }),
          cache: 'no-store',
        });

        if (!res.ok) {
          alert(strings.errorsFetchTotalUserCtErr);
          setUserCtCardError(true);
          throw new Error(`${strings.errorsFetchTotalUserCtErr}: ${res.status}`);
        }

        const data = await res.json();
        if (data.success === false) {
          if (data.message) {
            alert(data.message);
            setUserCtCardError(true);
            setUserCtCardLoading(false);
            throw new Error(data.message);
          } else {
            alert(strings.errorsUnknownError);
            setUserCtCardError(true);
            setUserCtCardLoading(false);
            throw new Error(strings.errorsUnknownError);
          }
        } else if (data.count) {
          console.log(strings.logsTotalUsers, data.count);
          setTotalUsers(data.count);
          setUserCtCardLoading(false);
        }
      } catch (error) {
        alert(strings.errorsFetchTotalUserCtErr);
        setUserCtCardError(true);
        setUserCtCardLoading(false);
        console.error(strings.errorsFetchTotalUserCtErrFancy, error);
      }
    })();
  }, []);
  
  return (
    <div className="space-y-8">
      <h1 className="text-4xl font-bold text-primary">{strings.usersHeader}</h1>
      <div className="grid gap-6 sm:grid-cols-3 lg:grid-cols-4">
        <Card className="flex flex-col justify-between">
          <CardHeader>
            <CardTitle>{strings.adminQuickActionsCardTitle}</CardTitle>
          </CardHeader>
          <CardContent className="grid gap-4">
            <Button className="w-full justify-start" variant="outline" asChild>
              <a href="/admin/users/new">
                <UserPlus className="mr-2 h-4 w-4" />
                {strings.createUserButtonText}
              </a>
            </Button>
          </CardContent>
        </Card>
        <Card className="flex flex-col justify-between">
          <CardHeader>
            <div className="flex justify-between items-start">
              <CardTitle className="text-xl text-primary">{strings.totalUsersCardTitle}</CardTitle>
              <span className="text-4xl font-bold text-primary ml-2">
                {userCtCardLoading ? (
                  <div className="animate-spin rounded-full h-16 w-16 border-4 border-t-slate-800 border-white"></div>
                ) : userCtCardError ? (
                  <div className="flex items-center text-red-500">
                    <CircleAlert />
                    <p className="text-base ml-1.5">{strings.errorsSuperGeneric}</p>
                  </div>
                ) : (
                  totalUsers
                )}
              </span>
            </div>
          </CardHeader>
        </Card>
      </div>
    </div>
  )
}