import { browser } from "wxt/browser";
import { defineContentScript } from "wxt/utils/define-content-script";

type PublisherRequestMessage = {
  source: "geo-admin";
  type: "geo.publisher.request";
  requestId: string;
  action: "ping" | "detectPlatforms" | "registerInstallation" | "bindAccount" | "publishArticle";
  payload?: unknown;
};

type BackgroundSuccessResponse = {
  ok: true;
  data: unknown;
};

type BackgroundErrorResponse = {
  ok: false;
  error?: string;
};

function isBackgroundResponse(value: unknown): value is BackgroundSuccessResponse | BackgroundErrorResponse {
  return typeof value === "object" && value !== null && "ok" in value;
}

export default defineContentScript({
  matches: ["http://*/*", "https://*/*"],
  main() {
    window.addEventListener("message", async (event: MessageEvent<PublisherRequestMessage>) => {
      if (event.source !== window || !event.data || event.data.type !== "geo.publisher.request") {
        return;
      }
      if (event.data.source !== "geo-admin") {
        return;
      }

      const { requestId, action, payload } = event.data;

      try {
        const response = await browser.runtime.sendMessage({
          type: "geo.publisher.request",
          action,
          payload,
        });

        const data = isBackgroundResponse(response)
          ? (() => {
              if (!response.ok) {
                throw new Error(response.error || "publisher_plugin_unknown_error");
              }
              return response.data;
            })()
          : response;

        if (typeof data === "undefined") {
          throw new Error("publisher_plugin_empty_response");
        }

        window.postMessage(
          {
            source: "geo-extension",
            type: "geo.publisher.response",
            requestId,
            success: true,
            data,
          },
          window.location.origin,
        );
      } catch (error) {
        window.postMessage(
          {
            source: "geo-extension",
            type: "geo.publisher.response",
            requestId,
            success: false,
            error: error instanceof Error ? error.message : "publisher_plugin_unknown_error",
          },
          window.location.origin,
        );
      }
    });
  },
});