import { observer } from "mobx-react";
import { useSearchParams } from "next/navigation";
import type { FormEvent } from "react";
import { useMemo, useState } from "react";
// icons
import { Eye, EyeOff } from "lucide-react";
// buzzwareTech imports
import { E_PASSWORD_STRENGTH } from "@buzzwaretech/constants";
import { useTranslation } from "@buzzwaretech/i18n";
import { Button } from "@buzzwaretech/propel/button";
import { TOAST_TYPE, setToast } from "@buzzwaretech/propel/toast";
import { Input, PasswordStrengthIndicator } from "@buzzwaretech/ui";
// components
import { getPasswordStrength } from "@buzzwaretech/utils";
// hooks
import { useUser } from "@/hooks/store/user";
import { useAppRouter } from "@/hooks/use-app-router";
// local components
import { FormContainer } from "./common/container";
import { AuthFormHeader } from "./common/header";

type TResetPasswordFormValues = {
  password: string;
  confirm_password?: string;
};

const defaultValues: TResetPasswordFormValues = {
  password: "",
};

export const SetPasswordForm = observer(function SetPasswordForm() {
  // router
  const router = useAppRouter();
  // search params
  const searchParams = useSearchParams();
  const oobCode = searchParams.get("oobCode");
  // states
  const [showPassword, setShowPassword] = useState({
    password: false,
    retypePassword: false,
  });
  const [passwordFormData, setPasswordFormData] =
    useState<TResetPasswordFormValues>(defaultValues);
  const [isPasswordInputFocused, setIsPasswordInputFocused] = useState(false);
  const [isRetryPasswordInputFocused, setIsRetryPasswordInputFocused] =
    useState(false);
  // buzzwareTech hooks
  const { t } = useTranslation();
  // hooks
  const { handleSetPassword } = useUser();

  const handleShowPassword = (key: keyof typeof showPassword) =>
    setShowPassword((prev) => ({ ...prev, [key]: !prev[key] }));

  const handleFormChange = (
    key: keyof TResetPasswordFormValues,
    value: string,
  ) => setPasswordFormData((prev) => ({ ...prev, [key]: value }));

  const isButtonDisabled = useMemo(
    () =>
      !!passwordFormData.password &&
      getPasswordStrength(passwordFormData.password) ===
        E_PASSWORD_STRENGTH.STRENGTH_VALID &&
      passwordFormData.password === passwordFormData.confirm_password
        ? false
        : true,
    [passwordFormData],
  );

  const handleSubmit = async (e: FormEvent<HTMLFormElement>) => {
    try {
      e.preventDefault();
      if (!oobCode) throw new Error("oobCode not found");
      await handleSetPassword(oobCode, passwordFormData.password);
      router.push("/");
    } catch (error: unknown) {
      let message = undefined;
      if (error instanceof Error) {
        const err = error as Error & { error?: string };
        message = err.error;
      }
      setToast({
        type: TOAST_TYPE.ERROR,
        title: t("common.errors.default.title"),
        message: message ?? t("common.errors.default.message"),
      });
    }
  };

  const password = passwordFormData?.password ?? "";
  const confirmPassword = passwordFormData?.confirm_password ?? "";
  const renderPasswordMatchError =
    !isRetryPasswordInputFocused || confirmPassword.length >= password.length;

  return (
    <FormContainer>
      <AuthFormHeader
        title="Set password"
        description="Create a new password."
      />
      <form className="space-y-4" onSubmit={(e) => handleSubmit(e)}>
        <div className="space-y-1">
          <label
            className="text-13 font-medium text-tertiary"
            htmlFor="password"
          >
            {t("auth.common.password.label")}
          </label>
          <div className="relative flex items-center rounded-md bg-surface-1">
            <Input
              type={showPassword.password ? "text" : "password"}
              name="password"
              value={passwordFormData.password}
              onChange={(e) => handleFormChange("password", e.target.value)}
              //hasError={Boolean(errors.password)}
              placeholder={t("auth.common.password.placeholder")}
              className="h-10 w-full border border-strong !bg-surface-1 pr-12 placeholder:text-placeholder"
              minLength={8}
              onFocus={() => setIsPasswordInputFocused(true)}
              onBlur={() => setIsPasswordInputFocused(false)}
              autoComplete="new-password"
              autoFocus
            />
            {showPassword.password ? (
              <EyeOff
                className="absolute right-3 h-5 w-5 stroke-placeholder hover:cursor-pointer"
                onClick={() => handleShowPassword("password")}
              />
            ) : (
              <Eye
                className="absolute right-3 h-5 w-5 stroke-placeholder hover:cursor-pointer"
                onClick={() => handleShowPassword("password")}
              />
            )}
          </div>
          <PasswordStrengthIndicator
            password={passwordFormData.password}
            isFocused={isPasswordInputFocused}
          />
        </div>
        <div className="space-y-1">
          <label
            className="text-13 font-medium text-tertiary"
            htmlFor="confirm_password"
          >
            {t("auth.common.password.confirm_password.label")}
          </label>
          <div className="relative flex items-center rounded-md bg-surface-1">
            <Input
              type={showPassword.retypePassword ? "text" : "password"}
              name="confirm_password"
              value={passwordFormData.confirm_password}
              onChange={(e) =>
                handleFormChange("confirm_password", e.target.value)
              }
              placeholder={t(
                "auth.common.password.confirm_password.placeholder",
              )}
              className="h-10 w-full border border-strong !bg-surface-1 pr-12 placeholder:text-placeholder"
              onFocus={() => setIsRetryPasswordInputFocused(true)}
              onBlur={() => setIsRetryPasswordInputFocused(false)}
              autoComplete="new-password"
            />
            {showPassword.retypePassword ? (
              <EyeOff
                className="absolute right-3 h-5 w-5 stroke-placeholder hover:cursor-pointer"
                onClick={() => handleShowPassword("retypePassword")}
              />
            ) : (
              <Eye
                className="absolute right-3 h-5 w-5 stroke-placeholder hover:cursor-pointer"
                onClick={() => handleShowPassword("retypePassword")}
              />
            )}
          </div>
          {!!passwordFormData.confirm_password &&
            passwordFormData.password !== passwordFormData.confirm_password &&
            renderPasswordMatchError && (
              <span className="text-13 text-danger-primary">
                {t("auth.common.password.errors.match")}
              </span>
            )}
        </div>
        <Button
          type="submit"
          variant="primary"
          className="w-full"
          size="xl"
          disabled={isButtonDisabled}
        >
          {t("common.continue")}
        </Button>
      </form>
    </FormContainer>
  );
});