import { logVerbose, shouldLogVerbose } from "../../globals.js";
import { createDedupeCache, type DedupeCache } from "../../infra/dedupe.js";
import type { MsgContext } from "../templating.js";

const DEFAULT_INBOUND_DEDUPE_TTL_MS = 20 * 60_000;
const DEFAULT_INBOUND_DEDUPE_MAX = 5000;

const inboundDedupeCache = createDedupeCache({
  ttlMs: DEFAULT_INBOUND_DEDUPE_TTL_MS,
  maxSize: DEFAULT_INBOUND_DEDUPE_MAX,
});

const normalizeProvider = (value?: string | null) =>
  value?.trim().toLowerCase() || "";

const resolveInboundPeerId = (ctx: MsgContext) =>
  ctx.OriginatingTo ?? ctx.To ?? ctx.From ?? ctx.SessionKey;

export function buildInboundDedupeKey(ctx: MsgContext): string | null {
  const provider = normalizeProvider(
    ctx.OriginatingChannel ?? ctx.Provider ?? ctx.Surface,
  );
  const messageId = ctx.MessageSid?.trim();
  if (!provider || !messageId) return null;
  const peerId = resolveInboundPeerId(ctx);
  if (!peerId) return null;
  const sessionKey = ctx.SessionKey?.trim() ?? "";
  const accountId = ctx.AccountId?.trim() ?? "";
  const threadId =
    typeof ctx.MessageThreadId === "number" ? String(ctx.MessageThreadId) : "";
  return [provider, accountId, sessionKey, peerId, threadId, messageId]
    .filter(Boolean)
    .join("|");
}

export function shouldSkipDuplicateInbound(
  ctx: MsgContext,
  opts?: { cache?: DedupeCache; now?: number },
): boolean {
  const key = buildInboundDedupeKey(ctx);
  if (!key) return false;
  const cache = opts?.cache ?? inboundDedupeCache;
  const skipped = cache.check(key, opts?.now);
  if (skipped && shouldLogVerbose()) {
    logVerbose(`inbound dedupe: skipped ${key}`);
  }
  return skipped;
}

export function resetInboundDedupe(): void {
  inboundDedupeCache.clear();
}