"use client";

import { coerceToArrayBuffer, coerceToBase64Url } from "@/helpers/base64";
import { registerPasskeyLink, verifyPasskeyRegistration } from "@/lib/server/passkeys";
import { useRouter } from "next/navigation";
import { useState, useEffect, useCallback } from "react";
import { useForm } from "react-hook-form";
import { Alert } from "./alert";
import { BackButton } from "./back-button";
import { Button, ButtonVariants } from "./button";
import { Spinner } from "./spinner";
import { Translated } from "./translated";

type Inputs = {};

type Props = {
  sessionId?: string;
  userId?: string;
  isPrompt: boolean;
  requestId?: string;
  organization?: string;
  code?: string;
  codeId?: string;
  loginName?: string;
};

export function RegisterPasskey({
  sessionId,
  userId,
  isPrompt,
  organization,
  requestId,
  code,
  codeId,
  loginName: initialLoginName,
}: Props) {
  const { handleSubmit, formState } = useForm<Inputs>({
    mode: "onChange",
  });

  const [error, setError] = useState<string>("");

  const [loading, setLoading] = useState<boolean>(false);

  const router = useRouter();

  async function submitVerify(
    passkeyId: string,
    passkeyName: string,
    publicKeyCredential: any,
    currentSessionId?: string,
    currentUserId?: string,
  ) {
    setLoading(true);
    const response = await verifyPasskeyRegistration({
      passkeyId,
      passkeyName,
      publicKeyCredential,
      sessionId: currentSessionId,
      userId: currentUserId,
    })
      .catch(() => {
        setError("Could not verify Passkey");
        return;
      })
      .finally(() => {
        setLoading(false);
      });

    return response;
  }

  const submitRegisterAndContinue = useCallback(async (): Promise<boolean | void> => {
    // Require either sessionId or userId
    if (!sessionId && !userId) {
      setError("Missing session or user information");
      return;
    }

    setLoading(true);

    let regReq;

    if (sessionId) {
      regReq = { sessionId };
    } else if (userId && code && codeId) {
      regReq = { userId, code, codeId };
    } else {
      setError("Missing code for user-based registration");
      setLoading(false);
      return;
    }

    const resp = await registerPasskeyLink(regReq)
      .catch(() => {
        setError("Could not register passkey");
        return;
      })
      .finally(() => {
        setLoading(false);
      });

    if (!resp) {
      setError("An error on registering passkey");
      return;
    }

    if ("error" in resp && resp.error) {
      setError(resp.error);
      return;
    }

    if (!("passkeyId" in resp)) {
      setError("An error on registering passkey");
      return;
    }

    const passkeyId = resp.passkeyId;
    const options: CredentialCreationOptions = (resp.publicKeyCredentialCreationOptions as CredentialCreationOptions) ?? {};

    if (!options.publicKey) {
      setError("An error on registering passkey");
      return;
    }

    options.publicKey.challenge = coerceToArrayBuffer(options.publicKey.challenge, "challenge");
    options.publicKey.user.id = coerceToArrayBuffer(options.publicKey.user.id, "userid");
    if (options.publicKey.excludeCredentials) {
      options.publicKey.excludeCredentials.map((cred: any) => {
        cred.id = coerceToArrayBuffer(cred.id as string, "excludeCredentials.id");
        return cred;
      });
    }

    const credentials = await navigator.credentials.create(options);

    if (
      !credentials ||
      !(credentials as any).response?.attestationObject ||
      !(credentials as any).response?.clientDataJSON ||
      !(credentials as any).rawId
    ) {
      setError("An error on registering passkey");
      return;
    }

    const attestationObject = (credentials as any).response.attestationObject;
    const clientDataJSON = (credentials as any).response.clientDataJSON;
    const rawId = (credentials as any).rawId;

    const data = {
      id: credentials.id,
      rawId: coerceToBase64Url(rawId, "rawId"),
      type: credentials.type,
      response: {
        attestationObject: coerceToBase64Url(attestationObject, "attestationObject"),
        clientDataJSON: coerceToBase64Url(clientDataJSON, "clientDataJSON"),
      },
    };

    const verificationResponse = await submitVerify(passkeyId, "", data, sessionId, userId);

    if (!verificationResponse) {
      setError("Could not verify Passkey!");
      return;
    }

    continueAndLogin(verificationResponse.loginName);
  }, [sessionId, userId, code]);

  // Auto-submit when code is provided (similar to VerifyForm)
  useEffect(() => {
    if (code) {
      submitRegisterAndContinue();
    }
  }, [code, submitRegisterAndContinue]);

  function continueAndLogin(loginName?: string) {
    const params = new URLSearchParams();

    if (organization) {
      params.set("organization", organization);
    }

    if (requestId) {
      params.set("requestId", requestId);
    }

    if (sessionId) {
      params.set("sessionId", sessionId);
    }

    if (userId) {
      params.set("userId", userId);
    }

    if (loginName ?? initialLoginName) {
      params.set("loginName", loginName ?? initialLoginName ?? "");
    }

    router.push("/passkey?" + params);
  }

  return (
    <form className="w-full">
      {error && (
        <div className="py-4">
          <Alert>{error}</Alert>
        </div>
      )}

      <div className="mt-8 flex w-full flex-row items-center">
        {isPrompt ? (
          <Button
            type="button"
            variant={ButtonVariants.Secondary}
            onClick={() => {
              continueAndLogin();
            }}
          >
            <Translated i18nKey="set.skip" namespace="passkey" />
          </Button>
        ) : (
          <BackButton />
        )}

        <span className="flex-grow"></span>
        <Button
          type="submit"
          className="self-end"
          variant={ButtonVariants.Primary}
          disabled={loading || !formState.isValid}
          onClick={handleSubmit(submitRegisterAndContinue)}
          data-testid="submit-button"
        >
          {loading && <Spinner className="mr-2 h-5 w-5" />} <Translated i18nKey="set.submit" namespace="passkey" />
        </Button>
      </div>
    </form>
  );
}