import { randomUUID } from "crypto";
import type { Config } from "../config";
import { prisma } from "../database/client";
import { loadXtreamByLineId } from "./service";

export type IptvWatchKind = "live" | "vod" | "series";

export type IptvActiveWatch = {
  id: string;
  iptvLineId: string;
  viewerUserId: string | null;
  addonTokenId: string | null;
  kind: IptvWatchKind;
  streamId: number;
  title: string;
  startedAt: Date;
  lastActivity: Date;
};

/** Eén actieve IPTV-kijk per lijn (nieuwste zender wint). */
const byLineId = new Map<string, IptvActiveWatch>();

/** Cache Xtream active_cons per lijn (admin pollt elke 5s). */
const consCache = new Map<string, { at: number; active: number }>();
const CONS_CACHE_MS = 20_000;
/** Altijd tonen na play, ook als XUI de connectie nog niet telt. */
const GRACE_MS = 3 * 60_000;
/** Hard maximum zonder enige activiteit / connectie. */
const MAX_AGE_MS = 6 * 60 * 60_000;

function viewerKey(viewerUserId: string | null, addonTokenId: string | null): string {
  return viewerUserId ?? addonTokenId ?? "anon";
}

export function touchIptvWatch(input: {
  iptvLineId: string;
  viewerUserId?: string | null;
  addonTokenId?: string | null;
  kind: IptvWatchKind;
  streamId: number;
  title: string;
}): IptvActiveWatch {
  const now = new Date();
  const existing = byLineId.get(input.iptvLineId);
  const sameChannel =
    existing &&
    existing.streamId === input.streamId &&
    existing.kind === input.kind &&
    viewerKey(existing.viewerUserId, existing.addonTokenId) ===
      viewerKey(input.viewerUserId ?? null, input.addonTokenId ?? null);

  const watch: IptvActiveWatch = {
    id: sameChannel ? existing.id : `iptv-${randomUUID()}`,
    iptvLineId: input.iptvLineId,
    viewerUserId: input.viewerUserId ?? existing?.viewerUserId ?? null,
    addonTokenId: input.addonTokenId ?? existing?.addonTokenId ?? null,
    kind: input.kind,
    streamId: input.streamId,
    title: input.title.trim() || existing?.title || `IPTV #${input.streamId}`,
    startedAt: sameChannel ? existing.startedAt : now,
    lastActivity: now,
  };
  byLineId.set(input.iptvLineId, watch);
  return watch;
}

export function refreshIptvWatch(opts: {
  iptvLineId: string;
  streamId?: number;
  title?: string;
}): void {
  const w = byLineId.get(opts.iptvLineId);
  if (!w) return;
  if (opts.streamId != null && w.streamId !== opts.streamId) return;
  w.lastActivity = new Date();
  if (opts.title?.trim()) w.title = opts.title.trim();
}

async function activeConsForLine(lineId: string, config: Config): Promise<number | null> {
  const cached = consCache.get(lineId);
  if (cached && Date.now() - cached.at < CONS_CACHE_MS) return cached.active;

  const xt = await loadXtreamByLineId(lineId, config);
  if (!xt) return null;
  try {
    const info = await xt.client.authenticate();
    const n = parseInt(String(info.activeConnections ?? "0"), 10);
    const active = Number.isFinite(n) ? n : 0;
    consCache.set(lineId, { at: Date.now(), active });
    return active;
  } catch {
    return null;
  }
}

/**
 * Actieve IPTV-kijks voor Admin Streams.
 * Na play: grace-periode. Daarna: aanhouden zolang Xtream active_cons > 0.
 */
export async function listActiveIptvWatches(config: Config): Promise<IptvActiveWatch[]> {
  const now = Date.now();
  const out: IptvActiveWatch[] = [];

  for (const [lineId, watch] of [...byLineId.entries()]) {
    const age = now - watch.lastActivity.getTime();
    if (age > MAX_AGE_MS) {
      byLineId.delete(lineId);
      continue;
    }

    if (age <= GRACE_MS) {
      out.push(watch);
      continue;
    }

    const cons = await activeConsForLine(lineId, config);
    if (cons != null && cons > 0) {
      watch.lastActivity = new Date();
      out.push(watch);
      continue;
    }
    if (cons === 0) {
      byLineId.delete(lineId);
      continue;
    }
    // Xtream onbereikbaar: nog even tonen
    if (age <= 15 * 60_000) out.push(watch);
    else byLineId.delete(lineId);
  }

  return out.sort((a, b) => b.lastActivity.getTime() - a.lastActivity.getTime());
}

/** Aantal watches in grace (dashboard-fallback zonder Xtream-check). */
export function countActiveIptvWatches(): number {
  const now = Date.now();
  let n = 0;
  for (const w of byLineId.values()) {
    if (now - w.lastActivity.getTime() <= MAX_AGE_MS) n += 1;
  }
  return n;
}

/** Stremio-addon: registreer kijk na stream-resolve. */
export async function touchIptvWatchForToken(
  tokenId: string,
  kind: IptvWatchKind,
  streamId: number,
  title: string
): Promise<void> {
  const token = await prisma.addonToken.findUnique({
    where: { id: tokenId },
    select: {
      id: true,
      viewerUserId: true,
      iptvLine: { select: { id: true } },
    },
  });
  if (!token) return;

  let lineId = token.iptvLine?.id ?? null;
  if (!lineId && token.viewerUserId) {
    const line = await prisma.iptvLine.findUnique({
      where: { viewerUserId: token.viewerUserId },
      select: { id: true },
    });
    lineId = line?.id ?? null;
  }
  if (!lineId) return;

  touchIptvWatch({
    iptvLineId: lineId,
    viewerUserId: token.viewerUserId,
    addonTokenId: token.id,
    kind,
    streamId,
    title,
  });
}

/** App-client: registreer kijk na /play. */
export async function touchIptvWatchForViewer(
  viewerId: string,
  kind: IptvWatchKind,
  streamId: number,
  title: string
): Promise<void> {
  const line = await prisma.iptvLine.findUnique({
    where: { viewerUserId: viewerId },
    select: { id: true },
  });
  if (!line) {
    // Legacy: lijn via iptvAddonTokenId
    const viewer = await prisma.viewerUser.findUnique({
      where: { id: viewerId },
      select: { iptvAddonTokenId: true },
    });
    if (!viewer?.iptvAddonTokenId) return;
    const legacy = await prisma.iptvLine.findUnique({
      where: { addonTokenId: viewer.iptvAddonTokenId },
      select: { id: true },
    });
    if (!legacy) return;
    touchIptvWatch({
      iptvLineId: legacy.id,
      viewerUserId: viewerId,
      addonTokenId: viewer.iptvAddonTokenId,
      kind,
      streamId,
      title,
    });
    return;
  }

  touchIptvWatch({
    iptvLineId: line.id,
    viewerUserId: viewerId,
    kind,
    streamId,
    title,
  });
}