import type { OpenAPI } from '@scalar/openapi-types';
import type { ERRORS, OpenApiVersion } from '../configuration/index.js';
/**
 * Merge types with each other
 */
type Merge<A, B> = A & Omit<B, keyof A>;
export type AnyObject = Record<string, any>;
export type UnknownObject = Record<string, unknown>;
/**
 * JSON, YAML or object representation of an OpenAPI API definition
 */
export type AnyApiDefinitionFormat = string | AnyObject;
export type LoadResult = {
    filesystem: Filesystem;
    specification: AnyObject;
    errors?: ErrorObject[];
};
export type ValidateResult = {
    valid: boolean;
    specification?: OpenAPI.Document;
    version?: OpenApiVersion;
    errors?: ErrorObject[];
    schema?: OpenAPI.Document;
};
export type UpgradeResult<T extends OpenAPI.Document = OpenAPI.Document> = {
    specification: T;
    version: '3.1';
};
export type FilterResult = {
    specification: AnyObject;
};
export type DetailsResult = {
    version: OpenApiVersion;
    specificationType: string;
    specificationVersion: string;
};
export type DereferenceResult = {
    version?: OpenApiVersion;
    specification?: OpenAPI.Document;
    schema?: OpenAPI.Document;
    errors?: ErrorObject[];
};
export type ErrorObject = {
    path?: string[];
    message: string;
    code?: keyof typeof ERRORS | string;
};
/**
 * Not literally a filesystem, but a list of files with their content.
 * This is an abstraction layer to handle multiple files in the browser (without access to the hard disk).
 */
export type Filesystem = FilesystemEntry[];
/**
 * Holds all information about a single file (doesn't have to be a literal file, see Filesystem).
 */
export type FilesystemEntry = {
    dir: string;
    isEntrypoint: boolean;
    references: string[];
    filename: string;
    specification: AnyObject;
};
/**
 * Options, that can apply to all commands
 */
export type OpenApiOptions = ThrowOnErrorOption;
export type ThrowOnErrorOption = {
    /**
     * If `true`, the function will throw an error if the document is invalid.
     *
     * @default false
     */
    throwOnError?: boolean;
};
declare global {
    /**
     * Available commands, can be extended dynamically
     */
    interface Commands {
    }
}
/**
 * Input and a list of tasks to pipe the input through.
 */
export type Queue<T extends readonly Task[] = readonly Task[]> = {
    /** The original input, can be a JSON or YAML string or an object */
    input: AnyApiDefinitionFormat;
    /** The current OpenAPI document, but as an object */
    specification: AnyObject;
    /** Global options */
    options?: OpenApiOptions;
    /** Queued tasks */
    tasks: T;
};
/**
 * Available tasks, populated from the global Commands interface
 */
export type Task = Commands[keyof Commands]['task'];
type EmptyCommandChainResult = {
    filesystem: Filesystem;
    specification: AnyObject;
};
/**
 * Command chain magic
 *
 * This type recursively builds a merged type based on the sequence of tasks.
 *
 * How it works:
 * 1. It uses a conditional type with recursion to process the task array.
 * 2. For each iteration:
 *    a. It extracts the first task (First) and the rest of the tasks (Rest).
 *    b. It checks if First is a valid Task and Rest is a Task array.
 *    c. If valid, it merges the Command type for the First task with the
 *       result of recursively processing the Rest of the tasks.
 * 3. The recursion continues until the task array is empty.
 * 4. When empty, it returns NonNullable<unknown> (equivalent to {}).
 *
 * Example:
 * For tasks ['load', 'validate']:
 * 1st iteration: Merge<Commands['load'], CommandChain<['validate']>>
 * 2nd iteration: Merge<Commands['load'], Merge<Commands['validate'], NonNullable<unknown>>>
 * Result: LoadResult & ValidateResult
 *
 * This type enables the API to correctly infer the return type based on
 * the sequence of method calls in the fluent interface.
 */
export type CommandChain<T extends Task[]> = T extends [infer First, ...infer Rest] ? First extends Task ? Rest extends Task[] ? Merge<Commands[First['name']]['result'], CommandChain<Rest>> : never : never : EmptyCommandChainResult;
export {};
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