export default () => ({
    port: parseInt(process.env.PORT ?? '4100', 10),
    corsOrigin: process.env.CORS_ORIGIN ?? 'http://localhost:5173',
    platform: {
        graphqlUrl: process.env.PLATFORM_GRAPHQL_URL ?? 'http://localhost:4000/graphql',
        apiKey: process.env.PLATFORM_API_KEY ?? '',
    },
    exotel: {
        apiKey: process.env.EXOTEL_API_KEY ?? '',
        apiToken: process.env.EXOTEL_API_TOKEN ?? '',
        accountSid: process.env.EXOTEL_ACCOUNT_SID ?? '',
        subdomain: process.env.EXOTEL_SUBDOMAIN ?? 'api.exotel.com',
        webhookSecret: process.env.EXOTEL_WEBHOOK_SECRET ?? '',
    },
    redis: {
        url: process.env.REDIS_URL ?? 'redis://localhost:6379',
    },
    sip: {
        domain: process.env.SIP_DOMAIN ?? 'blr-pub-rtc4.ozonetel.com',
        wsPort: process.env.SIP_WS_PORT ?? '444',
    },
    missedQueue: {
        pollIntervalMs: parseInt(process.env.MISSED_QUEUE_POLL_INTERVAL_MS ?? '30000', 10),
    },
    worklist: {
        // Per-page fetch size from the platform GraphQL endpoint. Tuned to
        // balance response size vs. page count. Platform's Relay pagination
        // typically caps at 100–200 per page.
        pageSize: parseInt(process.env.WORKLIST_PAGE_SIZE ?? '50', 10),
        // Hard ceiling on pages fetched per poll. Safety valve against
        // unbounded cost when a tenant has thousands of pending callbacks.
        // maxPages * pageSize = effective worklist size.
        maxPages: parseInt(process.env.WORKLIST_MAX_PAGES ?? '10', 10),
    },
    ai: {
        provider: process.env.AI_PROVIDER ?? 'openai',
        anthropicApiKey: process.env.ANTHROPIC_API_KEY ?? '',
        openaiApiKey: process.env.OPENAI_API_KEY ?? '',
        model: process.env.AI_MODEL ?? 'gpt-4o-mini',
    },
});