import { loadWebConfig } from "@toolctrl/config";
import { getAppConfiguration, updateAppConfiguration } from "~/utils/db/appConfiguration.db.server";

export const MAILJET_PROVIDER_ID = "mailjet" as const;

type MailjetProviderId = typeof MAILJET_PROVIDER_ID;
type MailjetSource = "environment" | "missing";

export type MailjetProviderStatus = {
  id: MailjetProviderId;
  name: "Mailjet";
  configured: boolean;
  source: {
    apiKey: MailjetSource;
    secretKey: MailjetSource;
    fromEmail: MailjetSource;
  };
  missing: string[];
};

export type UpdateMailjetSettingsResult =
  | { success: true }
  | { success: false; error: string };

export async function getMailjetProviderStatus({ request }: { request: Request }): Promise<MailjetProviderStatus> {
  await getAppConfiguration({ request });

  const mailjet = loadWebConfig().config.mailjet;

  const source = {
    apiKey: mailjet.apiKey ? "environment" : "missing",
    secretKey: mailjet.secretKey ? "environment" : "missing",
    fromEmail: mailjet.fromEmail ? "environment" : "missing",
  } satisfies MailjetProviderStatus["source"];

  const missing = [
    source.apiKey === "missing" ? "MAILJET_API_KEY" : null,
    source.secretKey === "missing" ? "MAILJET_SECRET_KEY" : null,
    source.fromEmail === "missing" ? "MAILJET_FROM_EMAIL" : null,
  ].filter((item): item is string => Boolean(item));

  return {
    id: MAILJET_PROVIDER_ID,
    name: "Mailjet",
    configured: missing.length === 0,
    source,
    missing,
  };
}

export async function updateMailjetSettings(form: FormData): Promise<UpdateMailjetSettingsResult> {
  const provider = form.get("emailProvider")?.toString();
  if (provider !== MAILJET_PROVIDER_ID) {
    return { success: false, error: "Only Mailjet is supported for transactional email." };
  }

  if (form.get("apiKey")?.toString().trim()) {
    return { success: false, error: "Mailjet API keys are configured through environment variables only." };
  }

  await updateAppConfiguration({
    emailProvider: MAILJET_PROVIDER_ID,
    emailSupportEmail: form.get("emailSupportEmail")?.toString(),
  });

  return { success: true };
}