"use server";

import { revalidatePath } from "next/cache";
import { getPaths } from "yt-dlp-transcript-common/lib/paths";
import {
  getHomepageConfig,
  writeHomepageConfig,
  parseHomepageUrl,
  type HomepageConfig,
} from "yt-dlp-transcript-common/lib/homepage";
import { formValues, type FormState } from "../../lib/formState";

// A failure carries what was submitted (lib/formState.ts).
export type SaveResult = FormState;

// Branding/config for the hub landing site. The hub is a single cross-site
// landing page (no authored Markdown pages), so this is the only homepage action.
export async function saveHomepageConfigAction(
  _prev: SaveResult | undefined,
  formData: FormData,
): Promise<SaveResult> {
  const values = formValues(formData);
  const paths = getPaths();
  const current = getHomepageConfig(paths);
  const siteTitle = String(formData.get("siteTitle") ?? "").trim();
  const headerTitle = String(formData.get("headerTitle") ?? "").trim();
  if (!siteTitle) {
    return { ok: false, error: "Site title is required", values };
  }
  if (!headerTitle) {
    return { ok: false, error: "Header title is required", values };
  }
  const siteUrlRaw = String(formData.get("siteUrl") ?? "").trim();
  if (siteUrlRaw && !parseHomepageUrl(siteUrlRaw)) {
    return {
      ok: false,
      error: "Public URL must be an absolute http(s):// URL, or left blank.",
      values,
    };
  }
  const cloudflareProject = String(
    formData.get("cloudflareProject") ?? "",
  ).trim();
  const next: HomepageConfig = {
    ...current,
    siteTitle,
    headerTitle,
    siteDescription: String(formData.get("siteDescription") ?? "").trim(),
    homeTagline: String(formData.get("homeTagline") ?? "").trim(),
    siteUrl: parseHomepageUrl(siteUrlRaw),
    cloudflareProject: cloudflareProject || undefined,
    // Default on, the site form's opt-out idiom: unticked → false → persisted.
    transcriptDownloads:
      formData.get("transcriptDownloads") === "on" ? undefined : false,
  };
  try {
    await writeHomepageConfig(next, paths);
  } catch (err) {
    return {
      ok: false,
      error: err instanceof Error ? err.message : String(err),
      values,
    };
  }
  revalidatePath("/sites");
  return { ok: true };
}