/**
 * Copyright (C) 2024-present Puter Technologies Inc.
 *
 * This file is part of Puter.
 *
 * Puter is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

import type { PuterRouter } from './core/http/PuterRouter';

export interface IAWSCredentials {
    access_key?: string;
    secret_key?: string;
    region?: string;
}

export interface IDynamoConfig {
    aws?: IAWSCredentials;
    endpoint?: string;
    /**
     * Filesystem path for the local dynalite store. Defaults to
     * `./volatile/runtime/puter-ddb`. Pass `':memory:'` (or set
     * `inMemory: true`) to run dynalite without persistence — the
     * recommended setup for unit/integration tests.
     */
    path?: string;
    /**
     * Run dynalite in-memory with no on-disk state. Equivalent to
     * `path: ':memory:'`. Intended for tests so each suite gets a
     * pristine in-process DynamoDB.
     */
    inMemory?: boolean;
    /**
     * Create required tables on startup if they don't exist. Off by
     * default because real-AWS deployments provision tables externally
     * (Terraform / IaC). Set to `true` when pointing at a local
     * DynamoDB emulator so self-hosters don't have to bootstrap by hand.
     */
    bootstrapTables?: boolean;
}

export interface IRedisConfig {
    startupNodes?: Array<{
        host: string;
        port: number;
    }>;
    /**
     * Use TLS for cluster connections. Defaults to `true` (matches prod
     * ElastiCache). Set `false` for self-host plain-TCP Valkey/Redis.
     */
    tls?: boolean;
    /**
     * Use ioredis-mock instead of a real Redis cluster — fully
     * in-process, no network. Defaults to `true` when `startupNodes`
     * is empty (so tests with no redis config get a mock for free).
     * Intended for unit/integration tests.
     */
    useMock?: boolean;
}

export interface IPagerConfig {
    pagerduty?: {
        enabled?: boolean;
        routingKey?: string;
    };
}

export interface ICfFileCacheConfig {
    /** POST endpoint that accepts batched `{ site, path }[]` invalidation payloads. */
    endpoint: string;
    /** Flush cadence in ms. Default 500. */
    throttle_ms?: number;
}

export interface IClickhouseConfig {
    url: string;
    username?: string;
    password?: string;
    /** Milliseconds. Default 15000. */
    request_timeout?: number;
    /** Max pending rows before backpressure drops oldest. Default 100000. */
    max_buffer_size?: number;
    /** Rows per flush. Default 500. */
    batch_size?: number;
    /** Flush cadence in ms. Default 5000. */
    flush_interval_ms?: number;
}

export interface IEmailConfig {
    /** "From" address used when callers don't override. */
    from?: string;
    // nodemailer transport options (passed through as-is)
    host?: string;
    port?: number;
    secure?: boolean;
    auth?: {
        user?: string;
        pass?: string;
    };
    service?: string;
    [key: string]: unknown;
}

/** Prelude (https://prelude.so) Verify v2 — SMS phone verification provider. */
export interface IPreludeConfig {
    /** Prelude v2 API key (sent as `Authorization: Bearer <apiKey>`). */
    apiKey?: string;
    /** Default region for parsing local-format phone numbers (e.g. 'US'). */
    defaultCountry?: string;
    /**
     * Per-SMS cost ceiling in EUR.
     */
    maxSmsCostEur?: number;
    /**
     * Verification template id (from the Prelude dashboard) that controls the
     * SMS wording — e.g. a "Your Puter verification code is {{code}}" template.
     * The message text itself is authored in Prelude, not here; this just
     * selects it. Omit to use the dashboard default.
     */
    templateId?: string;
    /**
     * Alphanumeric Sender ID to brand who the SMS is "from" (e.g. "Puter").
     * Must be pre-enabled by Prelude and isn't supported by all carriers/regions
     * (notably US long/short codes). Omit to use Prelude's default sender.
     */
    senderId?: string;
    /**
     * Channel Prelude prioritizes for delivery. Defaults to 'rcs' (much cheaper
     * than SMS); Prelude falls back to SMS when RCS isn't reachable. Requires an
     * RCS agent provisioned in the Prelude account to actually use RCS.
     */
    preferredChannel?:
        | 'sms'
        | 'rcs'
        | 'whatsapp'
        | 'viber'
        | 'zalo'
        | 'telegram';
}

/**
 * S3-compatible bucket the thumbnails extension uses for storing generated
 * thumbnails. When unset, the extension falls back to the main `S3Client`
 * (fauxqs locally, real S3 in prod) and writes into the default bucket.
 */
export interface IThumbnailStoreConfig {
    /** Bucket name. Default: `puter-local`. */
    name?: string;
    /** Endpoint URL — unset forces the fallback. */
    endpoint?: string;
    credentials?: {
        accessKeyId: string;
        secretAccessKey: string;
    };
}

/**
 * Shape of an entry under `config.providers.*` — each AI / integration driver
 * reads a slightly different subset of these keys. Kept permissive so new
 * providers don't have to touch the root type.
 */
export interface IAIProviderConfig {
    /** API key. Sole canonical name — drivers no longer accept `secret_key`/`api_key`/`key` aliases. */
    apiKey?: string;
    /** Cloudflare API token (semantically distinct from a regular key). Cloudflare-only. */
    apiToken?: string;
    /** Override the provider's HTTP base URL (OpenRouter, Cloudflare, ElevenLabs, Ollama). */
    apiBaseUrl?: string;
    /** Azure AI Foundry deployment endpoint (azure-openai). Required alongside `apiKey`. */
    apiURL?: string;
    /** Cloudflare account id. */
    accountId?: string;
    /** ElevenLabs default voice id. */
    defaultVoiceId?: string;
    /** ElevenLabs speech-to-speech model id. */
    speechToSpeechModelId?: string;
    /** Ollama toggle — defaults true; set `false` to disable. */
    enabled?: boolean;
    /** AWS credentials for AWS-backed providers (Polly, Textract). */
    aws?: IAWSCredentials;
    /** Escape hatch — providers often expose additional tuning knobs. */
    [key: string]: unknown;
}

/**
 * OIDC provider sub-config (google, custom, …). `google` uses discovery, so
 * only `client_id` + `client_secret` are required; custom providers must
 * also supply the three endpoint URLs explicitly.
 */
export interface IOIDCProviderConfig {
    client_id?: string;
    client_secret?: string;
    authorization_endpoint?: string;
    token_endpoint?: string;
    userinfo_endpoint?: string;
    /** Space-separated OAuth scopes. Default depends on provider. */
    scopes?: string;
    /** Apple Developer Team ID (apple provider only). */
    team_id?: string;
    /** Key ID for the Sign in with Apple private key (apple provider only). */
    key_id?: string;
    /** PKCS#8 PEM private key content from Apple (apple provider only). */
    private_key?: string;
    /** Azure AD tenant ID (microsoft provider only). Defaults to "common". */
    tenant_id?: string;
    [key: string]: unknown;
}

export interface IOIDCConfig {
    providers?: Record<string, IOIDCProviderConfig>;
}

export interface IPeersConfig {
    /** WebRTC signaller URL returned to clients. */
    signaller_url?: string;
    /** Fallback ICE server list when TURN credential generation fails. */
    fallback_ice?: unknown[];
    /** TURN credential generation config (Cloudflare-backed). */
    turn?: {
        cloudflare_turn_service_id?: string;
        cloudflare_turn_api_token?: string;
        /** Credential TTL in seconds. Default 86400. */
        ttl?: number;
    };
    /** Shared secret for the internal `/turn/ingest-usage` endpoint. */
    internal_auth_secret?: string;
}

export interface IBroadcastPeerConfig {
    /** Stable id of the peer (also sent as `X-Broadcast-Peer-Id`). */
    peerId?: string;
    /** Whether this peer should receive webhooks. Non-webhook peers are skipped. */
    webhook?: boolean;
    /** HTTPS endpoint to POST broadcast events to. */
    webhook_url?: string;
    /** HMAC-SHA256 secret shared with the peer for signing. */
    webhook_secret?: string;
}

export interface IBroadcastConfig {
    peers?: IBroadcastPeerConfig[];
    webhook?: {
        /** This server's peerId, sent in outbound POSTs as `X-Broadcast-Peer-Id`. */
        peerId?: string;
        /** Secret used to sign OUTBOUND POSTs. */
        secret?: string;
    };
    /** Reject webhooks whose timestamp is more than this many seconds in the past. Default 300. */
    webhook_replay_window_seconds?: number;
    /** Time to wait coalescing outbound events into a single peer POST. Default 2000ms. */
    outbound_flush_ms?: number;
}

/**
 * Cloudflare Workers deployment config used by `WorkerDriver`.
 */
export interface IWorkersConfig {
    XAUTHKEY?: string;
    ACCOUNTID?: string;
    /** Optional dispatch namespace — when set, scripts deploy under `/dispatch/namespaces/<ns>`. */
    namespace?: string;
    /** Base URL included as the `puter_endpoint` binding. Default `https://api.puter.com`. */
    internetExposedUrl?: string;
    /** URL returned by `getLoggingUrl()` — surfaced to clients that render worker logs. */
    loggingUrl?: string;
    [key: string]: string | undefined;
}

/**
 * Optional outbound-fetch proxy used by `secureFetch()` when the backend has
 * to fetch a user-supplied URL (e.g. image-gen `input_image`). Requests get
 * prefixed with `url` and sent through the Worker with `x-cors-proxy-auth-
 * secret: <secret>`; the Worker authenticates the secret, fetches the real
 * URL, and strips CORS on the response. Unset → fetches go direct (still
 * guarded by the URL/redirect/DNS checks in secureFetch).
 */
export interface ISecureCorsProxyConfig {
    url: string;
    secret: string;
}

export interface IWispConfig {
    /** WISP relay server address returned to clients on token create. */
    server?: string;
    [key: string]: unknown;
}

export interface IServerHealthConfig {
    /** DB liveness latency threshold (ms). Default 1500. */
    db_liveness_latency_fail_ms?: number;
    /** Staleness threshold for the health-check loop itself (ms). */
    stale_health_loop_fail_ms?: number;
}

export interface IS3LocalConfig {
    /**
     * Run fauxqs entirely in-memory: random port on `127.0.0.1`, no
     * `dataDir` / `s3StorageDir`. Intended for tests so each suite
     * gets a pristine in-process S3.
     */
    inMemory?: boolean;
    host?: string;
    port?: number;
    dataDir?: string;
    s3StorageDir?: string;
}

export interface IS3RemoteConfig {
    useCredentialChain?: boolean;
    endpoint: string;
    /**
     * Endpoint used when generating presigned URLs handed to clients
     * (browser uploads/downloads). Defaults to `endpoint`. Set this when
     * the server-side S3 endpoint isn't reachable from the browser — e.g.
     * self-host with `endpoint: http://s3:9000` (docker-internal) and
     * `publicEndpoint: http://localhost:9000` (host-published port).
     */
    publicEndpoint?: string;
    accessKeyId: string;
    secretAccessKey: string;
    region?: string;
    /**
     * Use path-style URLs (`<endpoint>/<bucket>`) instead of virtual-hosted
     * style (`<bucket>.<endpoint>`). Defaults to AWS SDK's default (virtual-
     * hosted, which only works on real AWS S3). Set `true` for S3-compatible
     * servers (RustFS, MinIO, fauxqs) where DNS-style addressing fails.
     */
    forcePathStyle?: boolean;
}

export interface IS3Config {
    localConfig?: IS3LocalConfig;
    s3Config?: IS3RemoteConfig;
}

export interface IDatabaseConfig {
    engine: 'sqlite' | 'mysql' | 'postgres';
    // sqlite
    /**
     * SQLite database file path. Defaults to `':memory:'` (the
     * better-sqlite3 in-memory mode), which is also what tests should
     * use. `inMemory: true` is an explicit alias for the same.
     */
    path?: string;
    /**
     * Force in-memory SQLite (ignores `path`). Equivalent to
     * `path: ':memory:'`. Intended for tests so each suite gets a
     * pristine in-process database. Test utilities also use
     * `engine: 'postgres'` with `inMemory: true` to run against pgmock.
     */
    inMemory?: boolean;
    targetVersion?: number;
    // mysql
    host?: string;
    port?: number;
    user?: string;
    password?: string;
    database?: string;
    connectionString?: string;
    url?: string;
    replica?: {
        host?: string;
        port?: number;
        user?: string;
        password?: string;
        database?: string;
        connectionString?: string;
        url?: string;
    };
    /**
     * Server-side execution cap for SELECT statements in ms (mysql engine;
     * applies to both pools — MySQL only enforces it on SELECTs, so writes
     * are unaffected). 0 disables. Default 30000.
     */
    selectTimeoutMs?: number;
    /**
     * Max time to wait for a pooled connection before the query batcher
     * treats acquisition as failed, in ms (mysql engine). 0 disables the
     * bound. Default 5000.
     */
    acquireTimeoutMs?: number;
    /**
     * Ordered list of directories whose `.sql` files are run sequentially at
     * server start (mysql/postgres engines). Numbered migration filenames sort
     * numerically; directories are processed in array order. Files MUST be
     * idempotent — there is no per-file applied-state tracking.
     * Relative paths resolve from `process.cwd()`.
     */
    migrationPaths?: string[];
}

/**
 * Bucket of pass-through values surfaced to the client-side `gui()` boot
 * function. Known fields are declared for lookup hygiene; unknown keys are
 * still tolerated so product teams can add one-off flags without churn.
 */
export interface IGuiParams {
    title?: string;
    short_description?: string;
    social_media_image?: string;
    /**
     * Public SDK key for Prelude's JS Signals SDK. When set, the phone-
     * verification window collects a `dispatch_id` (browser signals) and
     * forwards it to /send-confirm-phone, which passes it to Prelude's Verify
     * API so its abuse model can weigh the device. Omit to disable collection.
     */
    preludeSdkKey?: string;
    [key: string]: unknown;
}

export interface IDevWatcherConfig {
    /** Force-enable/disable the dev watcher. Defaults to enabled in dev. */
    enabled?: boolean;
    /** Root path for watcher entries. Relative paths resolve from package root. */
    root?: string;
    /** Delay after watcher startup before boot continues. Default: 5000. */
    ready_delay_ms?: number;
    /** Optional extra child processes to start with the dev watcher. */
    commands?: Array<{
        name: string;
        directory: string;
        command: string;
        args?: string[];
        env?: Record<string, string>;
    }>;
    /**
     * Optional webpack watcher entries.
     * Omit to use the built-in GUI/puter.js watchers.
     */
    webpack?: Array<{
        name?: string;
        directory: string;
        env?: Record<string, string>;
    }>;
}

/**
 * Complete shape of Puter's root config. Everything is optional here —
 * mandatory fields (only `port` + `extensions`) are pulled out of the
 * `Partial<...>` below and listed after it.
 *
 * When adding a new config field, declare it here with a doc comment so
 * there's a single discoverable reference for every config-driven switch.
 *
 * One value, one location: each setting lives at exactly one key. There are
 * no legacy aliases or fallback paths — older configs that relied on them
 * need to migrate.
 */
interface IConfigOptional {
    // -- Environment / identity --------------------------------------

    /** Environment marker. `dev` disables blocked-email checks, opens auto-browser, etc. */
    env: 'dev' | 'prod';
    /** Free-form name of the config profile (e.g. `oss-default`). Surfaced in logs. */
    config_name: string;
    /**
     * Console output format. `json` replaces the global console so every call
     * emits one structured JSON line (`level`, `timestamp`, `msg`, and the
     * active `traceId`) — one event per call, so a line-oriented log collector
     * can't split stack traces across events, and level filtering works. `text`
     * (the default) leaves console output human-readable for local/dev.
     */
    log_format: 'json' | 'text';
    /** Server version. Falls back to `npm_package_version`. */
    version: string;
    /** Stable identity for this server node. Enables pager alerts + graceful shutdown delay. */
    serverId: string;

    // -- Networking / URLs -------------------------------------------

    /** Protocol used for the externally-visible origin ('http' or 'https'). Default: 'http'. */
    protocol: string;
    /** Primary domain for Puter (e.g., `puter.localhost`, `puter.com`). */
    domain: string;
    /** Externally-visible port. Defaults to `port`. Behind a reverse proxy, set this to the public port. */
    pub_port: number;
    /** Fully-qualified externally-visible URL (protocol + domain + port). Computed from `protocol`/`domain`/`pub_port` if unset. */
    origin: string;
    /** Public base URL for the API subdomain, e.g. `https://api.puter.com`. Used to build signed URLs. */
    api_base_url: string;
    /** Static hosting domain for user sites (e.g., `puter.site`). */
    static_hosting_domain: string;
    /** Alt static hosting domain. */
    static_hosting_domain_alt: string;
    /** Private app hosting domain (e.g., `app.puter.localhost`). */
    private_app_hosting_domain: string;
    /** Alt private app hosting domain. */
    private_app_hosting_domain_alt: string;
    /**
     * Groups of equivalent app index_url hosts. Each group lists hosts that
     * should resolve to the same canonical app: `appUidFromOrigin` looks up
     * any DB row whose `index_url` is one of the group's hosts and returns
     * that row's UID for every host in the group.
     *
     * Hosts listed here are also reserved — `apps.create` / `apps.update`
     * reject any attempt to register a different app under one of these
     * hosts, so the group is owned by exactly one app row.
     *
     * Entries are bare hosts (no scheme), lowercased. Example:
     *   [
     *     ["camera.puter.com", "camera.puter.site", "camera.ca"],
     *     ["player.puter.com", "player.puter.site"],
     *   ]
     */
    app_origin_aliases?: string[][];
    /** When true, accept any Host header value. Dev/testing only. */
    allow_all_host_values: boolean;
    /** When true, accept requests without a Host header. */
    allow_no_host_header: boolean;
    /** When true, allow nip.io wildcard domains. */
    allow_nipio_domains: boolean;
    /** When true, support custom domain resolution for hosted sites. */
    custom_domains_enabled: boolean;
    /** When true, enable IP validation via event bus. */
    enable_ip_validation: boolean;
    /**
     * Express `trust proxy` setting — controls how `req.ip` is derived from
     * `X-Forwarded-For`. Set to the number of reverse-proxy hops in front of
     * the server (e.g. `1` for a single Cloudflare or nginx hop, `2` for
     * Cloudflare → ALB → app), or to a CIDR / IP / list of trusted proxy
     * addresses. `false` (default) disables XFF parsing — `req.ip` returns
     * the direct socket peer, which is the safe choice when no proxy is in
     * front. Never set to `true` in production: it trusts *every* hop and
     * makes XFF forgeable. See https://expressjs.com/en/guide/behind-proxies.html.
     */
    trust_proxy: boolean | number | string | string[];
    /** Don't launch browser when starting. */
    no_browser_launch: boolean;
    /** Disable dev-time frontend webpack watchers. */
    no_devwatch: boolean;
    /**
     * Skip first-boot bootstrap of the `admin` user and the credentials
     * banner that DefaultUserService prints. Intended for tests.
     */
    no_default_user: boolean;
    /**
     * Import `.ts` extension sources instead of built `.js`. Only for
     * transform-capable runtimes (the test harness sets this); plain node
     * cannot execute the TypeScript sources.
     */
    import_ts_extensions?: boolean;
    /** Optional dev-time frontend watcher overrides. */
    devwatch: IDevWatcherConfig;

    // -- Auth / session ----------------------------------------------

    /**
     * Legacy HMAC secret for v1 JWTs. New tokens are always signed with
     * `jwt_secret_v2`; this value is verify-only and accepted as long as
     * `allow_v1_tokens` is true (flipped off to retire v1).
     */
    jwt_secret: string;
    /** HMAC secret used to sign and verify v2 auth JWTs (`kid: 'v2'`). */
    jwt_secret_v2: string;
    /**
     * When false, v1 tokens (no `kid` header) are rejected at verify.
     * Default true during the v1→v2 migration window.
     */
    allow_v1_tokens: boolean;
    /**
     * When false, `POST /auth/migrate-token` returns 410 Gone for v1
     * `app-under-user` tokens. App-token migration is retired ahead
     * of access-token migration — keeping these on separate flags
     * lets ops kill apps first and keep API-key migration on
     * indefinitely. Default true.
     */
    allow_v1_app_migration: boolean;
    /**
     * Optional explicit allowlist of `Origin` header values that are
     * trusted by `POST /auth/migrate-token` to receive the
     * `puter_token_v2` companion cookie. The main `origin` is always
     * trusted. The token exchange itself is open to any browser origin
     * (the v1 bearer token is the credential); this list only gates
     * cookie issuance, so attacker pages can't plant a session cookie
     * on the GUI origin.
     */
    allow_migrate_token_origins?: string[];
    /** HMAC secret for signed file URLs (/file, /writeFile, /sign). */
    url_signature_secret: string;
    /** Name of the session cookie the auth probe reads. */
    cookie_name: string;
    /** Minimum password length for login/signup validation. */
    min_pass_length: number;
    /** When true, allow the 'system' user to log in. */
    allow_system_login: boolean;
    /**
     * When true, anonymous users cannot create new accounts or temporary
     * sessions. Existing accounts can still log in, and pre-existing
     * placeholder rows may still be claimed.
     */
    disable_user_signup: boolean;
    /** Reject auth-gated routes unless the user has confirmed their email. */
    strict_email_verification_required: boolean;
    /**
     * Force SMS phone verification on every new signup, regardless of abuse
     * reputation. Off by default; mainly a test/QA switch so the phone gate can
     * be exercised on demand (it otherwise only triggers for low-reputation
     * signups). Requires `prelude.apiKey` to actually deliver codes.
     */
    always_require_phone_verification: boolean;
    /**
     * Force credit-card verification on every new signup, regardless of abuse
     * reputation. Off by default; mainly a test/QA switch so the card gate can
     * be exercised on demand (it otherwise only triggers for low-reputation
     * signups). Requires a payments extension to actually run the $0 auth.
     */
    always_require_card_verification: boolean;
    /**
     * Let a user who keeps getting blocked on SMS phone verification fall
     * back to credit-card verification, which clears the phone gate (and the
     * card gate too, when one is set). Off by default.
     *
     * The fallback opens after `after_attempts` SMS *send* attempts inside
     * the send rate-limit window — successful sends count too, so a user who
     * receives codes fine can still choose the card path after that many
     * requests. This trades the phone signal for a card signal; it does NOT
     * guarantee SMS actually failed. Once open, the fallback stays open for
     * 24 hours so the user can finish the card flow. Requires a payments
     * extension to run the actual card check.
     */
    phone_verification_card_fallback: {
        enabled: boolean;
        /**
         * SMS send attempts (within the send rate-limit window) before the
         * card fallback opens. Defaults to 2 when omitted. Values above the
         * send route's rate limit (10/hour) are clamped down to it — requests
         * past the route limit never reach the attempt counter, so a higher
         * threshold could never be crossed.
         */
        after_attempts?: number;
    };
    /** Captcha configuration. */
    captcha: { enabled: boolean; difficulty?: 'easy' | 'medium' | 'hard' };
    /** OIDC / OAuth2 providers (google + custom). */
    oidc: IOIDCConfig;

    // -- Groups / provisioning ---------------------------------------

    /** UID of the persistent group that non-temp users are enrolled in at signup. */
    default_user_group: string;
    /** UID of the persistent group that temporary users are enrolled in at signup. */
    default_temp_group: string;
    /** When true, ACL grants read/list/see on `/<user>/Public` to any actor. */
    enable_public_folders: boolean;

    // -- Storage / S3 ------------------------------------------------

    /** S3 storage config (local fauxqs or remote). */
    s3: IS3Config;
    /** Default S3 bucket for file storage. */
    s3_bucket: string;
    /** Default S3 region. */
    s3_region: string;
    /** Fallback AWS region. */
    region: string;
    /** Default storage capacity per user (bytes). */
    storage_capacity: number;
    /** When false, storage is effectively unlimited (bounded by device space). */
    is_storage_limited: boolean;
    /** Bytes of device storage available (used when is_storage_limited=false). */
    available_device_storage: number;
    /** Optional dedicated S3-compatible bucket used by the thumbnails extension. */
    thumbnailStore: IThumbnailStoreConfig;

    // -- Database ----------------------------------------------------

    database: IDatabaseConfig;

    // -- Clients / infra ---------------------------------------------

    dynamo: IDynamoConfig;
    redis: IRedisConfig;
    pager: IPagerConfig;
    email: IEmailConfig;
    /** Optional — only set when SMS phone verification (Prelude) is wired in. */
    prelude: IPreludeConfig;
    /** Optional — only set when a ClickHouse analytics client is wired in. */
    clickhouse?: IClickhouseConfig;
    cf_file_cache: ICfFileCacheConfig;

    // -- Rate limiting -----------------------------------------------

    rate_limit: {
        /**
         * Rate limiter backend selection.
         *   - `memory`: per-node in-memory counters.
         *   - `redis`:  sorted-sets in Redis — shared state across nodes (default).
         *   - `kv`:     per-hit rows in the system KV store (DynamoDB), with TTL.
         */
        backend?: 'memory' | 'redis' | 'kv';
    };

    // -- AI / integration providers ----------------------------------
    //
    // All AI providers — chat, image, video, TTS, OCR, speech-to-text,
    // speech-to-speech — are configured under `providers[<provider-id>]`.
    // Provider ids match the driver-side identifier (e.g. `claude`,
    // `openai-image-generation`, `aws-textract`). There is no `services`
    // bag and no top-level `openai`/`gemini`/`mistral`/`elevenlabs`/`aws`
    // shortcut.
    providers: Record<string, IAIProviderConfig | undefined>;

    // -- Cross-node / external integrations --------------------------

    /** Cross-node event replication config. */
    broadcast: IBroadcastConfig;
    /** WebRTC signalling + TURN. */
    peers: IPeersConfig;
    /** WISP relay proxy. */
    wisp: IWispConfig;
    /** Cloudflare Workers driver config. */
    workers: IWorkersConfig;
    /** Optional CORS-stripping signed-Worker proxy used by `secureFetch`. */
    secureCorsProxy: ISecureCorsProxyConfig;
    /** Legacy Stripe billing extension. */

    // -- GUI / static mounts -----------------------------------------

    /** Absolute path to the GUI assets root. */
    gui_assets_root: string;
    /** Which profile in `puter-gui.json` to load. Default: `development`. */
    gui_profile: string;
    /**
     * Map of built-in app name → local directory served at `/builtin/<name>`.
     */
    builtin_apps: Record<string, string>;
    /** Force the bundled GUI even in dev. Default: false. */
    use_bundled_gui: boolean;
    /** Override the GUI bundle JS path. Default: `/dist/bundle.min.js`. */
    gui_bundle: string;
    /** Override the GUI CSS path when bundled. Default: `/dist/bundle.min.css`. */
    gui_css: string;
    /** Override the puter.js preload URL when bundled. Default: `https://js.puter.com/v2/`. */
    gui_puterjs_bundle: string;
    /** Free-form bag of values passed through to the client-side `gui()` function. */
    gui_params: IGuiParams;
    /**
     * Absolute path to the directory holding native app bundles, each in a
     * subdirectory matching its subdomain (e.g. `<root>/editor/`).
     */
    native_apps_root: string;
    /** Absolute path to a directory holding `puter.js`/`putility.js` version bundles. */
    client_libs_root: string;
    /** Path to the puter-js SDK root (serves `/sdk/*` and `/puter.js/v{1,2}`). */
    puterjs_root: string;

    // -- Extension-specific ------------------------------------------

    /**
     * Flat `{ flag_name: boolean }` bag of feature toggles. Non-boolean values
     * are coerced before use.
     *
     * Server-only by default. Flags are surfaced to clients via `/whoami` only
     * if their key is on the allowlist in `extensions/whoami.ts`
     * (`CLIENT_VISIBLE_FEATURE_FLAGS`). New flags should be assumed internal —
     * add them to the allowlist explicitly if (and only if) the client needs
     * to read them.
     */
    feature_flags: Record<string, boolean | string | number>;
    /** Blocked email TLDs / domains — checked in `prod` only. */
    blockedEmailDomains: string[];
    /** Contact-form recipient. Default `support@puter.com`. */
    support_email: string;
    /** Worker / subdomain names that cannot be allocated by users. */
    reserved_words: string[];
    /** Max subdomains a single user may own. Default 10. */
    max_subdomains_per_user: number;
    /** Health-check tuning. */
    server_health: IServerHealthConfig;

    //Metering
    unlimitedMetering?: boolean;
}

/**
 * Extension-augmentable config surface. Extensions add their own config keys
 * via TypeScript declaration merging:
 *
 *     declare module '@heyputer/backend/types' {
 *         interface IExtensionConfig {
 *             myExtension?: { foo: string };
 *         }
 *     }
 *
 * Augmentations flow into `IConfig`, which is what `this.config` /
 * `extension.config` are typed as everywhere.
 */
export interface IExtensionConfig {
    /**
     * Open index signature so config reads of extension-only keys return
     * `unknown` (not a type error). Extensions that declare-merge concrete
     * keys (`myExt?: { foo: string }`) override this for the named key —
     * the concrete property type wins over the index signature.
     */
    [key: string]: unknown;
}

export type IConfig = Partial<IConfigOptional> & {
    extensions: string[];
    port: number;
} & IExtensionConfig;

// eslint-disable-next-line @typescript-eslint/no-wrapper-object-types
export interface WithLifecycle extends Object {
    onServerStart?: () => Promise<void> | void;
    onServerShutdown?: () => Promise<void> | void;
    onServerPrepareShutdown?: () => Promise<void> | void;
}

export interface WithCostsReporting extends WithLifecycle {
    getReportedCosts?: () => // eslint-disable-next-line @typescript-eslint/no-explicit-any
        | Promise<Record<string, any>[]>
        // eslint-disable-next-line @typescript-eslint/no-explicit-any
        | Record<string, any>[];
}

export interface WithControllerRegistration extends WithCostsReporting {
    registerRoutes: (router: PuterRouter) => void;
}

export type LayerInstances<
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    T extends Record<string, (new (...args: any[]) => any) | any>,
> = {
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    [K in keyof T]: T[K] extends new (...args: any[]) => any
        ? InstanceType<T[K]>
        : T[K];
};