import type { Platform } from "./platform";
import { daysSince } from "./format";

// Retention window (days) after which a platform's stream VODs are typically
// deleted, making playback impossible. Only platforms whose VODs expire appear
// here; YouTube/Rumble/Odysee keep uploads indefinitely and are omitted.
//
// These are best-effort thresholds, not exact per-video promises:
//   - Kick: free-tier VODs live in a `kick-prod-videos-30-day` bucket (~30d).
//   - Twitch: past broadcasts last 7d (regular) / 14d (affiliate) /
//     60d (partner, Prime, Turbo). We can't detect a streamer's tier from
//     metadata, so we use 14d (the affiliate tier) as the flag point. The
//     "Likely expired" wording + the tooltip acknowledge the uncertainty for
//     partner (still up to 60d) and regular (already gone at 7d) accounts.
// Tune here if the retention policy changes.
export const VOD_RETENTION_DAYS: Partial<Record<Platform, number>> = {
  kick: 30,
  twitch: 14,
};

const RETENTION_TOOLTIP: Partial<Record<Platform, string>> = {
  kick: "Kick keeps VODs about 30 days after the stream, so this one has most likely been deleted. The transcript is still searchable here.",
  twitch:
    "Twitch keeps VODs 7–60 days depending on the streamer's account tier, so this one has most likely been deleted. The transcript is still searchable here.",
};

export type VodExpiryInfo = { likelyExpired: boolean; tooltip: string };

// Whether a VOD is likely past its platform's retention window, with a tooltip
// explaining why. Returns null for platforms whose content doesn't expire (or
// when the upload date is unknown), so callers render nothing.
export function vodExpiry(
  platform: Platform,
  uploadDate: string | undefined | null,
): VodExpiryInfo | null {
  const retention = VOD_RETENTION_DAYS[platform];
  if (retention === undefined) return null;
  const age = daysSince(uploadDate);
  if (age === null) return null;
  return {
    likelyExpired: age > retention,
    tooltip: RETENTION_TOOLTIP[platform] ?? "This VOD has most likely expired.",
  };
}