Initial OSS scaffold from Songs2VID (pre-strip)

lib/watermark-policy.ts

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+import path from "path";
+import type { Plan } from "@prisma/client";
+import { hasProFeatures } from "./edition";
+import {
+  DEFAULT_WATERMARK,
+  normalizeWatermarkSettings,
+  type WatermarkSettings,
+} from "./watermark";
+
+/** Free users get this many lifetime watermark-free successful videos. */
+export const FREE_UNWATERMARKED_VIDEO_LIMIT = 2;
+
+export type SubscriptionStatusLabel = "free" | "pro";
+
+export function subscriptionStatusFromPlan(plan: Plan): SubscriptionStatusLabel {
+  return hasProFeatures(plan) ? "pro" : "free";
+}
+
+/**
+ * Whether the Songs2VID brand watermark must be applied for this render slot.
+ * Pro / self-hosted: never forced. Free: forced after FREE_UNWATERMARKED_VIDEO_LIMIT.
+ */
+export function shouldApplyBrandWatermark(options: {
+  plan: Plan;
+  createdVideoCount: number;
+  /** 0-based index within the current batch (accounts for multi-file jobs). */
+  itemIndex?: number;
+}): boolean {
+  if (hasProFeatures(options.plan)) return false;
+  const slot = options.createdVideoCount + (options.itemIndex ?? 0);
+  return slot >= FREE_UNWATERMARKED_VIDEO_LIMIT;
+}
+
+/**
+ * Apply free/pro brand-watermark policy to normalized settings.
+ * - Pro: strip default brand watermark (custom text/logo kept).
+ * - Free under limit: force mode `none`.
+ * - Free at/over limit: force default brand overlay (bottom-right).
+ */
+export function applyBrandWatermarkPolicy(
+  input: Partial<WatermarkSettings> | null | undefined,
+  includeWatermarkFallback: boolean,
+  options: {
+    plan: Plan;
+    createdVideoCount: number;
+    itemIndex?: number;
+  },
+): WatermarkSettings {
+  const base = normalizeWatermarkSettings(input, includeWatermarkFallback);
+
+  if (hasProFeatures(options.plan)) {
+    if (base.mode === "default") {
+      return { ...base, mode: "none" };
+    }
+    return base;
+  }
+
+  if (shouldApplyBrandWatermark(options)) {
+    return {
+      ...DEFAULT_WATERMARK,
+      mode: "default",
+      position: "bottom-right",
+      offsetX: 20,
+      offsetY: 20,
+    };
+  }
+
+  return {
+    ...base,
+    mode: "none",
+  };
+}
+
+export function watermarkFreeRendersRemaining(createdVideoCount: number): number {
+  return Math.max(0, FREE_UNWATERMARKED_VIDEO_LIMIT - createdVideoCount);
+}
+
+/** Absolute path to the Songs2VID brand watermark asset (PNG). */
+export const WATERMARK_FILE_PATH = path.join(process.cwd(), "assets", "watermark.png");