import { observer } from "mobx-react";
import type { FormEvent } from "react";
import { useMemo, useRef, useState } from "react";
// icons
import { CircleAlert, XCircle } from "lucide-react";
// buzzwareTech imports
import { useTranslation } from "@buzzwaretech/i18n";
import { Button } from "@buzzwaretech/propel/button";
import type { IEmailCheckData } from "@buzzwaretech/types";
import { Input, Spinner } from "@buzzwaretech/ui";
import { checkEmailValidity, cn } from "@buzzwaretech/utils";
// helpers
type TAuthEmailForm = {
  defaultEmail: string;
  onSubmit: (data: IEmailCheckData) => Promise<void>;
};

export const AuthEmailForm = observer(function AuthEmailForm(
  props: TAuthEmailForm,
) {
  const { onSubmit, defaultEmail } = props;
  // states
  const [isSubmitting, setIsSubmitting] = useState(false);
  const [email, setEmail] = useState(defaultEmail);
  // buzzwareTech hooks
  const { t } = useTranslation();
  const emailError = useMemo(
    () =>
      email && !checkEmailValidity(email)
        ? { email: "auth.common.email.errors.invalid" }
        : undefined,
    [email],
  );

  const handleFormSubmit = async (event: FormEvent<HTMLFormElement>) => {
    event.preventDefault();
    setIsSubmitting(true);
    const payload: IEmailCheckData = {
      email: email,
    };
    await onSubmit(payload);
    setIsSubmitting(false);
  };

  const isButtonDisabled =
    email.length === 0 || Boolean(emailError?.email) || isSubmitting;

  const [isFocused, setIsFocused] = useState(true);
  const inputRef = useRef<HTMLInputElement>(null);

  return (
    <form onSubmit={handleFormSubmit} className="space-y-4">
      <div className="space-y-1">
        <label htmlFor="email" className="text-13 font-medium text-tertiary">
          {t("auth.common.email.label")}
        </label>
        <div
          className={cn(
            `relative flex items-center rounded-md border bg-surface-1`,
            !isFocused && Boolean(emailError?.email)
              ? `border-danger-strong`
              : `border-strong`,
          )}
          onFocus={() => {
            setIsFocused(true);
          }}
          onBlur={() => {
            setIsFocused(false);
          }}
        >
          <Input
            id="email"
            name="email"
            type="email"
            value={email}
            onChange={(e) => setEmail(e.target.value)}
            placeholder={t("auth.common.email.placeholder")}
            className={`h-10 w-full border-0 disable-autofill-style placeholder:text-placeholder autofill:bg-danger-primary focus:bg-none active:bg-transparent`}
            autoComplete="off"
            autoFocus
            ref={inputRef}
          />
          {email.length > 0 && (
            <button
              type="button"
              onClick={() => {
                setEmail("");
                inputRef.current?.focus();
              }}
              className="absolute right-3 grid size-5 place-items-center"
              aria-label={t("aria_labels.auth_forms.clear_email")}
              tabIndex={-1}
            >
              <XCircle className="size-5 stroke-placeholder" />
            </button>
          )}
        </div>
        {emailError?.email && !isFocused && (
          <p className="flex items-center gap-1 px-0.5 text-11 text-danger-primary">
            <CircleAlert height={12} width={12} />
            {t(emailError.email)}
          </p>
        )}
      </div>
      <Button
        type="submit"
        variant="primary"
        className="w-full"
        size="xl"
        disabled={isButtonDisabled}
      >
        {isSubmitting ? (
          <Spinner height="20px" width="20px" />
        ) : (
          t("common.continue")
        )}
      </Button>
    </form>
  );
});