import crypto from "node:crypto";
export class SessionRegistry {
    ttlMs;
    bindings = new Map();
    constructor(ttlSeconds) {
        this.ttlMs = ttlSeconds * 1000;
    }
    upsert(context, sessionId) {
        const binding = {
            conversationId: context.conversationId,
            sessionId,
            lastUsedAt: Date.now(),
        };
        this.bindings.set(this.makeKey(context), binding);
        return binding;
    }
    get(context) {
        const key = this.makeKey(context);
        const binding = this.bindings.get(key);
        if (!binding) {
            return null;
        }
        if (Date.now() - binding.lastUsedAt > this.ttlMs) {
            this.bindings.delete(key);
            return null;
        }
        binding.lastUsedAt = Date.now();
        return binding;
    }
    count() {
        this.evictExpired();
        return this.bindings.size;
    }
    evictExpired() {
        const expired = [];
        const now = Date.now();
        for (const [key, binding] of this.bindings.entries()) {
            if (now - binding.lastUsedAt > this.ttlMs) {
                expired.push(binding.sessionId);
                this.bindings.delete(key);
            }
        }
        return expired;
    }
    makeKey(context) {
        const digest = crypto
            .createHash("sha256")
            .update([
            context.conversationId,
            context.accessToken ?? "",
            context.projectId ?? "",
        ].join("|"))
            .digest("hex");
        return digest;
    }
}