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"use client";

import type React from "react";

import { useState } from "react";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import {
  Card,
  CardContent,
  CardDescription,
  CardFooter,
  CardHeader,
  CardTitle,
} from "@/components/ui/card";
import { useRouter } from "next/navigation";

export default function Home() {
  const [rm, setRm] = useState("");
  const [nome, setNome] = useState("");
  const [cpf, setCpf] = useState("");
  const [errors, setErrors] = useState<{
    rm?: string;
    nome?: string;
    cpf?: string;
  }>({});
  const router = useRouter();

  function validateCPF(cpf: string): boolean {
    cpf = cpf.replace(/\D/g, "");

    if (cpf.length !== 11 || /^(\d)\1{10}$/.test(cpf)) return false;

    const calc = (factor: number) =>
      cpf
        .split("")
        .slice(0, factor - 1)
        .reduce(
          (sum, num, index) => sum + parseInt(num) * (factor - index),
          0
        ) %
        11 <
      2
        ? 0
        : 11 -
          (cpf
            .split("")
            .slice(0, factor - 1)
            .reduce(
              (sum, num, index) => sum + parseInt(num) * (factor - index),
              0
            ) %
            11);

    return calc(10) === parseInt(cpf[9]) && calc(11) === parseInt(cpf[10]);
  }

  const handleSubmit = (e: React.FormEvent) => {
    e.preventDefault();

    const newErrors: { rm?: string; nome?: string; cpf?: string } = {};

    if (!/^\d{5}$/.test(rm)) {
      newErrors.rm = "O RM deve conter exatamente 5 dígitos numéricos.";
    }

    if (!nome || nome.trim().length < 3) {
      newErrors.nome = "Por favor, insira seu nome completo.";
    }

    if (!validateCPF(cpf)) {
      newErrors.cpf = "CPF inválido. Insira um CPF válido com 11 dígitos.";
    }

    if (Object.keys(newErrors).length > 0) {
      setErrors(newErrors);
      return;
    }

    setErrors({});

    router.push(
      `/confirmar?rm=${rm}&nome=${encodeURIComponent(nome)}&cpf=${cpf}`
    );
  };

  const formatCPF = (value: string) => {
    const cpfClean = value.replace(/\D/g, "");
    let formatted = cpfClean;

    if (cpfClean.length > 3) {
      formatted = cpfClean.substring(0, 3) + "." + cpfClean.substring(3);
    }
    if (cpfClean.length > 6) {
      formatted = formatted.substring(0, 7) + "." + cpfClean.substring(6, 9);
    }
    if (cpfClean.length > 9) {
      formatted = formatted.substring(0, 11) + "-" + cpfClean.substring(9, 11);
    }

    return formatted;
  };

  const handleCPFChange = (e: React.ChangeEvent<HTMLInputElement>) => {
    const value = e.target.value;
    const formatted = formatCPF(value);
    setCpf(formatted);

    if (errors.cpf) {
      setErrors((prev) => ({ ...prev, cpf: undefined }));
    }
  };

  return (
    <div className="flex min-h-screen flex-col items-center justify-center bg-[#f0f5fa] px-4 sm:px-6 lg:px-8">
      <div className="w-full max-w-md">
      <div className="mb-6 flex items-center justify-center">
        <div className="flex flex-col items-center">
        <div className="mb-2 text-center text-2xl sm:text-3xl font-bold text-[#004a93]">
          JUSTIÇA ELEITORAL ESTUDANTIL
        </div>
        <div className="h-2 w-full bg-gradient-to-r from-[#009c3b] via-[#ffdf00] to-[#002776]"></div>
        </div>
      </div>

      <Card className="border-2 border-[#004a93] shadow-lg overflow-hidden">
        <CardHeader className="bg-[#004a93] text-center text-white">
        <CardTitle className="text-xl sm:text-2xl">ELEIÇÕES ESTUDANTIS</CardTitle>
        <CardDescription className="text-gray-100">
          Identificação do Eleitor
        </CardDescription>
        </CardHeader>
        <CardContent className="pt-6">
        <form onSubmit={handleSubmit} className="space-y-4">
          <div className="space-y-2">
          <label
            htmlFor="rm"
            className="text-sm font-medium text-[#004a93]"
          >
            Digite seu RM:
          </label>
          <Input
            id="rm"
            type="text"
            value={rm}
            onChange={(e) => {
            setRm(e.target.value);
            if (errors.rm) {
              setErrors((prev) => ({ ...prev, rm: undefined }));
            }
            }}
            placeholder="Digite os 5 dígitos do seu RM"
            className="border-2 border-[#004a93]"
            maxLength={5}
          />
          {errors.rm && (
            <p className="text-sm text-red-500">{errors.rm}</p>
          )}
          </div>

          <div className="space-y-2">
          <label
            htmlFor="nome"
            className="text-sm font-medium text-[#004a93]"
          >
            Digite seu nome completo:
          </label>
          <Input
            id="nome"
            type="text"
            value={nome}
            onChange={(e) => {
            setNome(e.target.value);
            if (errors.nome) {
              setErrors((prev) => ({ ...prev, nome: undefined }));
            }
            }}
            placeholder="Digite seu nome completo"
            className="border-2 border-[#004a93]"
          />
          {errors.nome && (
            <p className="text-sm text-red-500">{errors.nome}</p>
          )}
          </div>

          <div className="space-y-2">
          <label
            htmlFor="cpf"
            className="text-sm font-medium text-[#004a93]"
          >
            Digite seu CPF:
          </label>
          <Input
            id="cpf"
            type="text"
            value={cpf}
            onChange={handleCPFChange}
            placeholder="Digite seu CPF"
            className="border-2 border-[#004a93]"
            maxLength={14}
          />
          {errors.cpf && (
            <p className="text-sm text-red-500">{errors.cpf}</p>
          )}
          </div>

          <Button
          type="submit"
          className="w-full bg-[#004a93] text-white hover:bg-[#003a73]"
          >
          CONFIRMAR
          </Button>
        </form>
        </CardContent>
        <CardFooter className="flex justify-center border-t border-[#004a93] bg-[#f8f8f8] py-3 text-sm text-[#004a93] rounded-b-lg">
        Seu voto é secreto e seguro.
        </CardFooter>
      </Card>

      <div className="mt-4 flex justify-center">
        <div className="text-center text-sm text-[#004a93]">
        © {new Date().getFullYear()} Justiça Eleitoral Estudantil
        </div>
      </div>
      </div>
    </div>
  );
}