import browser from "webextension-polyfill";
import localforage from "localforage";
import { cloudAuth } from "@/seqta/utils/CloudAuth";

const ACCOUNTS_BASE = "https://accounts.betterseqta.org";
const PLUGIN_SETTINGS_KEY = "plugin.profile-picture.settings";

const profileStore = localforage.createInstance({
  name: "profile-picture-store",
  storeName: "profilePicture",
});

function cacheBustPfpUrl(url: string): string {
  const base = url.split("?")[0]!;
  return `${base}?v=${Date.now()}`;
}

export async function isUseCloudPfpEnabled(): Promise<boolean> {
  const stored = await browser.storage.local.get(PLUGIN_SETTINGS_KEY);
  const settings = stored[PLUGIN_SETTINGS_KEY] as { useCloudPfp?: boolean } | undefined;
  return !!settings?.useCloudPfp;
}

async function parseJsonResponse(r: Response): Promise<Record<string, unknown>> {
  const text = await r.text();
  try {
    return text ? (JSON.parse(text) as Record<string, unknown>) : {};
  } catch {
    return {};
  }
}

export async function syncLocalProfilePictureToCloud(): Promise<{
  success: boolean;
  error?: string;
}> {
  if (!(await isUseCloudPfpEnabled()) || !cloudAuth.state.isLoggedIn) {
    return { success: true };
  }

  const token = await cloudAuth.getStoredToken();
  if (!token) return { success: false, error: "Not logged in" };

  const blob = await profileStore.getItem<Blob>("profile-picture");

  try {
    if (!blob || !(blob instanceof Blob)) {
      const res = await fetch(`${ACCOUNTS_BASE}/api/user/pfp/clear`, {
        method: "POST",
        headers: {
          Authorization: `Bearer ${token}`,
          "Content-Type": "application/json",
        },
        body: JSON.stringify({}),
      });
      const data = await parseJsonResponse(res);
      if (!res.ok) {
        return { success: false, error: (data.error as string) ?? `Clear failed (${res.status})` };
      }
      const user = cloudAuth.state.user;
      if (user) {
        await cloudAuth.setUser({ ...user, pfpUrl: undefined });
      }
      return { success: true };
    }

    if (!blob.type.startsWith("image/")) {
      return { success: false, error: "Invalid file type" };
    }
    if (blob.size > 5 * 1024 * 1024) {
      return { success: false, error: "File too large (max 5MB)" };
    }

    const formData = new FormData();
    formData.append("file", blob, "profile-picture");

    const res = await fetch(`${ACCOUNTS_BASE}/api/user/pfp`, {
      method: "POST",
      headers: { Authorization: `Bearer ${token}` },
      body: formData,
    });
    const data = await parseJsonResponse(res);
    if (!res.ok) {
      return { success: false, error: (data.error as string) ?? `Upload failed (${res.status})` };
    }

    const pfpUrl = data.pfpUrl as string | undefined;
    const user = cloudAuth.state.user;
    if (user && pfpUrl) {
      await cloudAuth.setUser({ ...user, pfpUrl: cacheBustPfpUrl(pfpUrl) });
    }
    return { success: true };
  } catch (err) {
    return {
      success: false,
      error: err instanceof Error ? err.message : "Cloud profile picture sync failed",
    };
  }
}

/** Notify SEQTA content scripts to refresh the in-page profile image. */
export async function notifyProfilePictureChanged(): Promise<void> {
  const revision = Date.now();
  await browser.storage.local.set({ profile_picture_revision: revision });
}