'use client';

import { ArrowLeft, CableTag } from 'iconoir-react';
import { useRouter } from 'next/navigation';
import { nip19 } from 'nostr-tools';
import { Resolver, useForm } from 'react-hook-form';

type FormValues = {
  key: string;
};

const resolver: Resolver<FormValues> = async (values) => {
  return {
    values: values.key ? values : {},
    errors: !values.key
      ? {
          key: {
            type: 'required',
            message: 'This is required.',
          },
        }
      : {},
  };
};

export default function Page() {
  const router = useRouter();
  const {
    register,
    setError,
    handleSubmit,
    formState: { errors, isDirty, isValid, isSubmitting },
  } = useForm<FormValues>({ resolver });

  const goBack = () => {
    router.back();
  };

  const onSubmit = async (data: any) => {
    let privkey = data['key'];

    if (privkey.substring(0, 4) === 'nsec') {
      privkey = nip19.decode(privkey).data;
    }

    try {
      router.push(`/onboarding/login/${privkey}`);
    } catch (error) {
      setError('key', {
        type: 'custom',
        message: 'Private Key is invalid, please check again',
      });
    }
  };

  return (
    <div className="grid h-full w-full grid-rows-5">
      <div className="row-span-1 mx-auto flex w-full max-w-md items-center justify-between">
        <button
          onClick={() => goBack()}
          className="group inline-flex h-6 w-6 items-center justify-center rounded-md hover:bg-zinc-900"
        >
          <ArrowLeft width={16} height={16} className="text-zinc-500 group-hover:text-zinc-300" />
        </button>
        <div>
          <h1 className="bg-gradient-to-br from-zinc-200 via-white to-zinc-300 bg-clip-text text-3xl font-semibold text-transparent">
            Login with Private Key
          </h1>
        </div>
        <div></div>
      </div>
      <form onSubmit={handleSubmit(onSubmit)} className="row-span-4">
        <div className="mx-auto w-full max-w-md">
          <div className="flex flex-col gap-4">
            <div>
              {/* #TODO: add function */}
              <button className="inline-flex w-full transform items-center justify-center gap-1.5 rounded-lg bg-zinc-700 px-3.5 py-2.5 font-medium text-zinc-200 shadow-input ring-1 ring-zinc-600 active:translate-y-1">
                {/* #TODO: change to nostr connect logo */}
                <CableTag width={20} height={20} className="text-fuchsia-500" />
                <span>Continue with Nostr Connect</span>
              </button>
            </div>
            <div className="relative">
              <div className="absolute inset-0 flex items-center">
                <div className="w-full border-t border-zinc-800"></div>
              </div>
              <div className="relative flex justify-center">
                <span className="bg-black px-2 text-sm text-zinc-500">or</span>
              </div>
            </div>
            <div className="flex flex-col gap-2">
              <div className="relative shrink-0 before:pointer-events-none before:absolute before:-inset-1 before:rounded-[11px] before:border before:border-blue-500 before:opacity-0 before:ring-2 before:ring-blue-500/20 before:transition after:pointer-events-none after:absolute after:inset-px after:rounded-[7px] after:shadow-highlight after:shadow-white/5 after:transition focus-within:before:opacity-100 focus-within:after:shadow-blue-500/100 dark:focus-within:after:shadow-blue-500/20">
                <input
                  {...register('key', { required: true, minLength: 32 })}
                  type={'password'}
                  placeholder="Paste private key here..."
                  className="relative w-full rounded-lg border border-black/5 px-3.5 py-2.5 text-center shadow-input shadow-black/5 !outline-none placeholder:text-zinc-400 dark:bg-zinc-800 dark:text-zinc-200 dark:shadow-black/10 dark:placeholder:text-zinc-500"
                />
              </div>
              <span className="text-sm text-red-400">{errors.key && <p>{errors.key.message}</p>}</span>
            </div>
          </div>
          <div className="mt-1 flex h-10 items-center justify-center">
            {isSubmitting ? (
              <svg
                className="h-5 w-5 animate-spin text-white"
                xmlns="http://www.w3.org/2000/svg"
                fill="none"
                viewBox="0 0 24 24"
              >
                <circle className="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" strokeWidth="4"></circle>
                <path
                  className="opacity-75"
                  fill="currentColor"
                  d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"
                ></path>
              </svg>
            ) : (
              <button
                type="submit"
                disabled={!isDirty || !isValid}
                className="w-full transform rounded-lg bg-gradient-to-r from-fuchsia-300 via-orange-100 to-amber-300 px-3.5 py-2.5 font-medium text-zinc-800 active:translate-y-1 disabled:cursor-not-allowed disabled:opacity-30"
              >
                <span className="drop-shadow-lg">Continue →</span>
              </button>
            )}
          </div>
        </div>
      </form>
    </div>
  );
}
