import { Card, CardContent } from "@/components/ui/card";
import { Mail, Lock, User, Phone } from "lucide-react";
import { Link, useLocation } from "react-router";
import { Input } from "@/components/ui/input";
import { Button } from "@/components/ui/button";

import { useCallback, useState } from "react";
import { useForm, type SubmitHandler } from "react-hook-form";

interface RegisterForm {
  fullName: string;
  email: string;
  phoneNumber: string;
  password: string;
  repeatPassword: string;
}

export default function RegisterPage() {
  const {
    register,
    handleSubmit,
    reset,
    formState: { errors },
  } = useForm<RegisterForm>();

  const location = useLocation();

  const [isLoading, setLoading] = useState(false);
  const [error, setError] = useState("");
  const [success, setSuccess] = useState("");

  const onSubmit: SubmitHandler<RegisterForm> = useCallback(
    async (data) => {
      setLoading(true);
      setError("");
      setSuccess("");

      try {
        const response = await fetch("/api/v1/register", {
          method: "POST",
          body: JSON.stringify({
            full_name: data.fullName,
            email: data.email,
            ...(data.phoneNumber ? { phone_number: data.phoneNumber } : {}),
            password: data.password,
          }),
          headers: {
            "Content-Type": "application/json",
          },
        });
        if (response.status != 200) {
          const json = await response.json();
          const text = json.error || "Unexpected error happened";
          setError(
            `Failed to create an account. ${
              text[0].toUpperCase() + text.slice(1)
            }`,
          );
        } else {
          setSuccess(
            "Account has been created. You can now log into your new account",
          );
          reset();
        }
      } catch (err) {
        console.log(err);
        setError("Failed to create account. Unexpected error happened");
      } finally {
        setLoading(false);
      }
    },
    [reset],
  );

  return (
    <div className="relative z-10 flex items-center justify-center min-h-screen">
      <Card className="sm:w-96 sm:min-w-96 sm:max-w-96 sm:min-h-auto p-3 min-h-screen w-full min-w-full shadow-lg bg-white/65 dark:bg-black/65 backdrop-blur-md">
        <div className="flex flex-col items-center pt-16 sm:pt-0">
          <img
            src="/icon.png"
            alt="icon"
            className="w-16 h-16 mb-4 mt-2 sm:mt-6"
          />

          <div className="px-4 sm:mt-4 mt-8">
            <h2 className="text-2xl font-bold text-gray-800 dark:text-gray-200 text-left w-full">
              Sign Up
            </h2>
            <h4 className="text-base mb-3 text-gray-400 dark:text-gray-600 text-left">
              Fill up this form to start using homelab services and tools.
            </h4>
          </div>

          <CardContent className="w-full space-y-4">
            <form onSubmit={handleSubmit(onSubmit)}>
              <div className="mb-4">
                <div className="relative">
                  <User className="absolute left-3 top-1/2 transform -translate-y-1/2 text-gray-400 w-4 h-4" />
                  <Input
                    id="full_name"
                    type="text"
                    placeholder="Full Name"
                    className="pl-10"
                    {...register("fullName", { required: true })}
                    aria-invalid={errors.fullName ? "true" : "false"}
                  />
                </div>
                {!!errors.fullName && (
                  <p className="text-red-600 opacity-70 text-sm">
                    {errors.fullName.message ?? "Full Name is required"}
                  </p>
                )}
              </div>

              <div className="mb-4">
                <div className="relative">
                  <Mail className="absolute left-3 top-1/2 transform -translate-y-1/2 text-gray-400 w-4 h-4" />
                  <Input
                    id="email"
                    type="email"
                    placeholder="Email Address"
                    className="pl-10"
                    {...register("email", {
                      required: true,
                      pattern: {
                        value: /\S+@\S+\.\S+/,
                        message: "Invalid email",
                      },
                    })}
                    aria-invalid={errors.email ? "true" : "false"}
                  />
                </div>
                {!!errors.email && (
                  <p className="text-red-600 opacity-70 text-sm">
                    {errors.email.message ?? "Email is required"}
                  </p>
                )}
              </div>

              <div className="mb-4">
                <div className="relative">
                  <Phone className="absolute left-3 top-1/2 transform -translate-y-1/2 text-gray-400 w-4 h-4" />
                  <Input
                    id="phone_number"
                    type="tel"
                    placeholder="Phone Number"
                    className="pl-10"
                    {...register("phoneNumber", {
                      required: false,
                    })}
                    aria-invalid={errors.phoneNumber ? "true" : "false"}
                  />
                </div>
                {!!errors.phoneNumber && (
                  <p className="text-red-600 opacity-70 text-sm">
                    {errors.phoneNumber.message ?? "Phone Number is required"}
                  </p>
                )}
              </div>

              <div className="mb-4">
                <div className="relative">
                  <Lock className="absolute left-3 top-1/2 transform -translate-y-1/2 text-gray-400 w-4 h-4" />
                  <Input
                    id="password"
                    type="password"
                    placeholder="Password"
                    className="pl-10"
                    {...register("password", {
                      required: true,
                      validate: (password) => {
                        if (password.length < 8) {
                          return "Password must be at least 8 characters long";
                        }
                        if (!password.match(/[a-zA-Z]+/gi)) {
                          return "Password must contain characters";
                        }
                        if (
                          password.split("").every((c) => c.toLowerCase() == c)
                        ) {
                          return "Password should contain at least 1 uppercase character";
                        }
                        if (!password.match(/\d+/gi)) {
                          return "Password should contain at least 1 digit";
                        }
                      },
                    })}
                    aria-invalid={errors.password ? "true" : "false"}
                  />
                </div>
                {!!errors.password && (
                  <p className="text-red-600 opacity-70 text-sm">
                    {errors.password.message ?? "Password is required"}
                  </p>
                )}
              </div>

              <div className="mb-4">
                <div className="relative">
                  <Lock className="absolute left-3 top-1/2 transform -translate-y-1/2 text-gray-400 w-4 h-4" />
                  <Input
                    id="repeat_password"
                    type="password"
                    placeholder="Repeat Password"
                    className="pl-10"
                    {...register("repeatPassword", {
                      required: true,
                      validate: (repeatPassword, { password }) => {
                        if (repeatPassword != password) {
                          return "Password does not match";
                        }
                      },
                    })}
                    aria-invalid={errors.repeatPassword ? "true" : "false"}
                  />
                </div>
                {!!errors.repeatPassword && (
                  <p className="text-red-600 opacity-70 text-sm">
                    {errors.repeatPassword.message ?? "Password is required"}
                  </p>
                )}
              </div>

              {success.length > 0 && (
                <div className="border border-green-400 p-2 rounded bg-green-200 text-sm">
                  {success}
                </div>
              )}

              {error.length > 0 && (
                <div className="border border-red-400 p-2 rounded bg-red-200 dark:border-red-600 dark:bg-red-400 text-sm">
                  {error}
                </div>
              )}

              <Button className="w-full mt-2 mb-4" loading={isLoading}>
                Register
              </Button>
              <div className="text-sm text-center text-gray-600">
                Already have an account?{" "}
                <Link
                  to="/auth/login"
                  state={location.state}
                  className="text-blue-600 hover:underline"
                >
                  Login
                </Link>
              </div>
            </form>
          </CardContent>
        </div>
      </Card>
    </div>
  );
}
