import { FastifyPluginCallback, FastifySchema, RouteOptions } from 'fastify'
import {
  OpenAPI,
  OpenAPIV2,
  OpenAPIV3,
  // eslint-disable-next-line camelcase
  OpenAPIV3_1
} from 'openapi-types'

/**
 * Swagger-UI Vendor Extensions
 * @see https://support.smartbear.com/swaggerhub/docs/apis/vendor-extensions.html#api-docs-x-tokenname
 */
declare module 'openapi-types' {
  namespace OpenAPIV3 {
    interface OAuth2SecurityScheme {
      'x-tokenName'?: string;
    }
  }
  namespace OpenAPIV2 {
    interface SecuritySchemeOauth2Base {
      'x-tokenName'?: string;
    }
  }
}

declare module 'fastify' {
  interface FastifyInstance {
    swagger:
    ((opts?: { yaml?: false }) => OpenAPI.Document) &
    ((opts: { yaml: true }) => string) &
    ((opts: { yaml: boolean }) => OpenAPI.Document | string);

    swaggerCSP: {
      script: string[];
      style: string[];
    }
  }

  interface FastifySchema {
    hide?: boolean;
    deprecated?: boolean;
    tags?: readonly string[];
    description?: string;
    summary?: string;
    consumes?: readonly string[];
    produces?: readonly string[];
    externalDocs?: OpenAPIV2.ExternalDocumentationObject | OpenAPIV3.ExternalDocumentationObject;
    security?: ReadonlyArray<{ [securityLabel: string]: readonly string[] }>;
    /**
     * OpenAPI operation unique identifier
     */
    operationId?: string;
  }

  interface RouteShorthandOptions {
    links?: {
      [statusCode: string]: OpenAPIV3.ResponseObject['links'];
    }
  }

  interface FastifyContextConfig {
    swaggerTransform?: fastifySwagger.SwaggerTransform | false;
    swagger?: {
      exposeHeadRoute?: boolean
    }
  }
}

type SwaggerDocumentObject = {
  swaggerObject: Partial<OpenAPIV2.Document>;
} | {
  // eslint-disable-next-line camelcase
  openapiObject: Partial<OpenAPIV3.Document | OpenAPIV3_1.Document>;
}

type FastifySwagger = FastifyPluginCallback<fastifySwagger.SwaggerOptions>

declare namespace fastifySwagger {
  export type SwaggerOptions = (FastifyStaticSwaggerOptions | FastifyDynamicSwaggerOptions)
  export interface FastifySwaggerOptions {
    mode?: 'static' | 'dynamic';
  }

  type JSONValue =
    | string
    | null
    | number
    | boolean
    | JSONObject
    | Array<JSONValue>

  export interface JSONObject {
    [key: string]: JSONValue;
  }

  export type SwaggerTransform<S extends FastifySchema = FastifySchema> = ({
    schema,
    url,
    route,
    ...documentObject
  }: {
    schema: S;
    url: string;
    route: RouteOptions;
  } & SwaggerDocumentObject) => { schema: FastifySchema; url: string }

  // eslint-disable-next-line camelcase
  export type SwaggerTransformObject = (documentObject: SwaggerDocumentObject) => Partial<OpenAPIV2.Document> | Partial<OpenAPIV3.Document | OpenAPIV3_1.Document>

  export interface FastifyDynamicSwaggerOptions extends FastifySwaggerOptions {
    mode?: 'dynamic';
    swagger?: Partial<OpenAPIV2.Document>;
    // eslint-disable-next-line camelcase
    openapi?: Partial<OpenAPIV3.Document | OpenAPIV3_1.Document>
    hiddenTag?: string;
    hideUntagged?: boolean;

    /** Include HEAD routes in the definitions */
    exposeHeadRoutes?: boolean;

    /**
     * Strips matching base path from routes in documentation
     * @default true
     */
    stripBasePath?: boolean;
    /**
     * custom function to transform the route's schema and url
     */
    transform?: SwaggerTransform;

    /**
     * custom function to transform the openapi or swagger object before it is rendered
     */
    transformObject?: SwaggerTransformObject;

    /** Overrides the Fastify decorator. */
    decorator?: 'swagger' | (string & Record<never, never>);

    refResolver?: {
      /** Clone the input schema without changing it. Default to `false`. */
      clone?: boolean;
      buildLocalReference: (
        /** The `json` that is being resolved. */
        json: JSONObject,
        /** The `baseUri` object of the schema. */
        baseUri: {
          scheme?: string;
          userinfo?: string;
          host?: string;
          port?: number | string;
          path?: string;
          query?: string;
          fragment?: string;
          reference?: string;
          error?: string;
        },
        /** `fragment` is the `$ref` string when the `$ref` is a relative reference. */
        fragment: string,
        /** `i` is a local counter to generate a unique key. */
        i: number
      ) => string;
    }

    /**
     * Whether to convert const definitions to enum definitions.
     * const support was added in OpenAPI 3.1, but not all tools support it.
     * This option only affects OpenAPI documents.
     * @default true
     */
    convertConstToEnum?: boolean;
  }

  export interface StaticPathSpec {
    path: string;
    postProcessor?: (spec: OpenAPI.Document) => OpenAPI.Document;
    baseDir: string;
  }

  export interface StaticDocumentSpec {
    document: OpenAPIV2.Document | OpenAPIV3.Document;
  }

  export interface FastifyStaticSwaggerOptions extends FastifySwaggerOptions {
    mode: 'static';
    specification: StaticPathSpec | StaticDocumentSpec;
  }

  export function formatParamUrl (paramUrl: string): string

  export const fastifySwagger: FastifySwagger
  export { fastifySwagger as default }
}

declare function fastifySwagger (...params: Parameters<FastifySwagger>): ReturnType<FastifySwagger>

export = fastifySwagger