/// <reference types="node" />
import type { OutgoingHttpHeaders } from 'node:http';
import type { CreateStorageOptions, Storage } from 'unstorage';
import type { H3Event } from 'h3';
import type { NuxtMultiCacheRouteCacheHelper } from './helpers/RouteCacheHelper.js';
import type { NuxtMultiCacheCDNHelper } from './helpers/CDNHelper.js';
import type { MultiCacheState } from './helpers/MultiCacheState.js';
interface CacheConfigOptions {
    /**
     * Set if the cache is enabled.
     *
     * While the cache will be disabled during the app's runtime, all the
     * corresponding code (components, composables, etc.) will still be added,
     * even if the value is `false` here. This is so that it's possible to
     * disable caching without having to refactor your code.
     *
     * If you wish to completely disable a feature so that no code is added just
     * leave the entire configuration property undefined.
     */
    enabled?: boolean;
}
export type CDNOptions = {
    /**
     * Enable the CDN headers feature.
     */
    enabled: boolean;
    /**
     * The header to use for the cache-control settings.
     */
    cacheControlHeader?: string;
    /**
     * The header to use for the cache tags header.
     */
    cacheTagHeader?: string;
};
export interface NuxtMultiCacheOptions {
    /**
     * Component cache.
     *
     * When enabled you can use the <RenderCacheable> wrapper component to cache
     * the generated markup of its slot children. Each subsequent request will
     * load the markup from cache and bypass rendering entirely.
     *
     * This is generally used for global components like navigation or footer,
     * but it can also be used to cache an entire page when used in a layout
     * component. It also supports caching payloads.
     *
     * The performance improvements are most noticeable if you have complex
     * components and a lot of pages.
     */
    component?: CacheConfigOptions;
    /**
     * Generic data cache.
     *
     * Can be used for anything: Caching API responses, expensive calculations,
     * slow external APIs, etc.
     */
    data?: CacheConfigOptions;
    /**
     * Route cache.
     *
     * Caches routes based on the path. Works for both rendered Nuxt pages and
     * server API routes.
     */
    route?: CacheConfigOptions;
    /**
     * Configuration for the CDN headers feature.
     *
     * This feature allows you to manage special HTTP headers used by
     * Cloudflare, Fastly, Varnish and other caching services. These headers
     * control how long a page should be cached, how long stale cache entries
     * should be served, what the cache tags are, etc.
     *
     * Note that this is fundamentally different to the route cache: This
     * feature only sets response headers, while the route cache actually caches
     * pages.
     *
     * In addition, these headers are never sent to the client. They are
     * intercepted by the CDN/HTTP cache and only used internally.
     *
     * It's possible to use both the CDN feature and the route cache at the same
     * time. Note that they each have independent state; e.g. if you set a max
     * age for the route cache it doesn't affect the max age value for the CDN
     * headers.
     */
    cdn?: CDNOptions;
    /**
     * Settings for the API endpoints.
     */
    api?: {
        /**
         * Enable the API endpoints for cache management.
         */
        enabled?: boolean;
        /**
         * The prefix used for the API endpoints.
         *
         * @default '/__nuxt_multi_cache'
         */
        prefix?: string;
        /**
         * The authorization for the API endpoints.
         *
         * If a string is provided, the auth check will be done using the
         * `x-nuxt-multi-cache-token` header.
         *
         * If a function is provided you can implement a custom auth check that
         * should return a Promise that resolves to true or false.
         *
         * If `false` is provided then authorization check is skipped. Only do
         * this if you made sure that the API endpoints are not public, since this
         * can potentially leak sensitive information via cached data or allow
         * anyone to purge cache entries!
         */
        authorization: string | false;
        /**
         * Delay for invalidating cache tags.
         *
         * Since purging by cache tag requires looping over all cache entries this
         * action is debounced. The value (in milliseconds) will be the amount of
         * delay that is used to buffer incoming tag invalidations. The delay is
         * fixed and starts when the first invalidation request comes in, then all
         * requests are added to the buffer. Once the delay is over, the cache
         * entries for all the tags are purged and the timeout is reset.
         */
        cacheTagInvalidationDelay?: number;
    };
    /**
     * Log detailled messages to the console.
     */
    debug?: boolean;
}
export interface NuxtMultiCacheSSRContext {
    /**
     * The component cache instance.
     */
    component?: Storage;
    /**
     * The data cache instance.
     */
    data?: Storage;
    /**
     * The route cache instance.
     */
    route?: Storage;
}
export interface CacheItem {
    data: string;
    expires?: number;
    cacheTags?: string[];
}
export interface RouteCacheItem extends CacheItem {
    headers: Record<string, any>;
    statusCode: number;
    staleWhileRevalidate: boolean;
    staleIfErrorExpires?: number;
}
export interface ComponentCacheItem extends CacheItem {
    payload?: Record<string, any>;
}
export type ComponentCacheEntry = ComponentCacheItem | string;
export type MultiCacheServerOptions = {
    component?: {
        storage?: CreateStorageOptions;
    };
    data?: {
        storage?: CreateStorageOptions;
    };
    route?: {
        storage?: CreateStorageOptions;
        /**
         * Provide a custom function that builds the cache key for a route.
         */
        buildCacheKey?: (event: H3Event) => string;
        /**
         * Alter the headers that are stored in the cache.
         *
         * You can use this to prevent certain headers from ever being cached,
         * such as Set-Cookie.
         */
        alterCachedHeaders?: (headers: OutgoingHttpHeaders) => OutgoingHttpHeaders | Record<string, any>;
        /**
         * A function to determine whether route caching is potentially possible.
         *
         * In order to minimize the number of calls to get routes from the cache,
         * it makes sense to already exclude certain paths, such as `/_nuxt` or static assets like .css, .js, .png, .jpg, etc.
         */
        applies?: (path: string) => boolean;
    };
    /**
     * Determine if caching should be used for the given request.
     *
     * If the method resolves to `false` the cache context singleton is not
     * attached to the request, which prevents getting and setting cache entries
     * for the duration of the request.
     *
     * This does not affect the CDN feature.
     *
     * One use case might be to prevent caching for requests coming from
     * authenticated users to make it impossible to cache sensitive data.
     * Or to offer a quick way to disable caching based on local or remote
     * configuration.
     */
    enabledForRequest?: (event: H3Event) => Promise<boolean>;
    /**
     * Define a global cache key prefix.
     *
     * Can be a string or a method that returns a promise that resolves to a
     * string given the H3 request event.
     *
     * This is useful if you have multiple Nuxt instances running on the same
     * code base but with a different global context. For example in a
     * multi-domain setup you might have one instance per domain, but each
     * instance uses the same cache backend (e.g. redis). Setting a global prefix
     * will make sure that each instance is scoped.
     */
    cacheKeyPrefix?: string | ((event: H3Event) => Promise<string>);
    api?: {
        /**
         * The authorization for the API endpoints.
         *
         * should return a Promise that resolves to true or false.
         */
        authorization?: (event: H3Event) => Promise<boolean>;
    };
};
export type MutliCacheServerOptions = MultiCacheServerOptions;
export type MultiCacheRuntimeConfig = {
    cdn: {
        enabled: boolean;
        cacheControlHeader: string;
        cacheTagHeader: string;
    };
    component: boolean;
    data: boolean;
    route: boolean;
    api: {
        enabled: boolean;
        prefix: string;
        cacheTagInvalidationDelay: number;
        authorizationToken: string;
        authorizationDisabled: boolean;
    };
};
export interface MultiCacheApp {
    /**
     * The cache singleton.
     */
    cache: NuxtMultiCacheSSRContext;
    /**
     * The server options.
     */
    serverOptions: MultiCacheServerOptions;
    /**
     * The runtime configuration.
     */
    config: MultiCacheRuntimeConfig;
    /**
     * The state.
     */
    state: MultiCacheState;
}
declare module 'nitropack' {
    interface NitroApp {
        /**
         * The nuxt-multi-cache cache context.
         */
        multiCache: MultiCacheApp;
    }
}
declare module 'h3' {
    interface H3Event {
        /**
         * The nuxt-multi-cache cache context.
         */
        __MULTI_CACHE?: NuxtMultiCacheSSRContext;
        /**
         * The nuxt-multi-cache route cache helper.
         */
        __MULTI_CACHE_ROUTE?: NuxtMultiCacheRouteCacheHelper;
        /**
         * The nuxt-multi-cache CDN helper.
         */
        __MULTI_CACHE_CDN?: NuxtMultiCacheCDNHelper;
        /**
         * The nuxt-multi-cache global cache prefix that is applied to all caches.
         */
        __MULTI_CACHE_PREFIX?: string;
        /**
         * Contains the already fetched cached route, if it exists.
         */
        __MULTI_CACHE_DECODED_CACHED_ROUTE?: RouteCacheItem;
        /**
         * The route cache key that is currently being revalidated.
         */
        __MULTI_CACHE_REVALIDATION_KEY?: string;
        /**
         * Whether the current request has already been served from cache.
         */
        __MULTI_CACHE_SERVED_FROM_CACHE?: boolean;
    }
}
export {};