import * as Koa from "koa";
import { Files } from 'formidable';

declare module "koa" {
    interface Request extends Koa.BaseRequest {
        body?: any;
        files?: Files;
    }
}

declare namespace koaBody {
    interface IKoaBodyFormidableOptions {

        /**
         * {Integer} Limits the amount of memory all fields together (except files) can allocate in bytes. If this value is exceeded, an 'error' event is emitted. The default size is 20MB.
         */
        maxFileSize?: number;

        /**
         * {Integer} Limits the number of fields that the querystring parser will decode, default 1000
         */
        maxFields?: number;

        /**
         * {Integer} Limits the amount of memory all fields together (except files) can allocate in bytes.
         * If this value is exceeded, an 'error' event is emitted, default 2mb (2 * 1024 * 1024)
         */
        maxFieldsSize?: number;

        /**
         * {String} Sets the directory for placing file uploads in, default os.tmpDir()
         */
        uploadDir?: string;

        /**
         * {Boolean} Files written to uploadDir will include the extensions of the original files, default false
         */
        keepExtensions?: boolean;

        /**
         * {String} If you want checksums calculated for incoming files, set this to either 'sha1' or 'md5', default false
         */
        hash?: string;

        /**
         * {Boolean} Multiple file uploads or no, default true
         */
        multiples?: boolean;

        /**
         * {Function} Special callback on file begin. The function is executed directly by formidable.
         * It can be used to rename files before saving them to disk. See https://github.com/felixge/node-formidable#filebegin
         */
        onFileBegin?: (name: string, file: any) => void;
    }
    interface IKoaBodyOptions {
        /**
         * {Boolean} Patch request body to Node's ctx.req, default false
         *
         * Note: You can patch request body to Node or Koa in same time if you want.
         */
        patchNode?: boolean;

        /**
         * {Boolean} Patch request body to Koa's ctx.request, default true
         *
         * Note: You can patch request body to Node or Koa in same time if you want.
         */
        patchKoa?: boolean;

        /**
         * {String|Integer} The byte (if integer) limit of the JSON body, default 1mb
         */
        jsonLimit?: string|number;

        /**
         * {String|Integer} The byte (if integer) limit of the form body, default 56kb
         */
        formLimit?: string|number;

        /**
         * {String|Integer} The byte (if integer) limit of the text body, default 56kb
         */
        textLimit?: string|number;

        /**
         * {String} Sets encoding for incoming form fields, default utf-8
         */
        encoding?: string;

        /**
         * {Boolean} Parse multipart bodies, default false
         */
        multipart?: boolean;

        /**
         * {Boolean} Parse urlencoded bodies, default true
         */
        urlencoded?: boolean;

        /**
         * {Boolean} Parse text bodies, default true
         */
        text?: boolean;

        /**
         * {Boolean} Parse json bodies, default true
         */
        json?: boolean;

        /**
         * Toggles co-body strict mode; if true, only parses arrays or objects, default true
         */
        jsonStrict?: boolean;
        
        /**
         * Toggles co-body returnRawBody mode; if true, 
         * the raw body will be available using a Symbol for 'unparsedBody'.
         * 
         * ```
         // Either: 
         const unparsed = require('koa-body/unparsed.js');
         const unparsed = Symbol.for('unparsedBody');
          
         // Then later, to access: 
         ctx.request.body[unparsed]
         ```
         * default false
         */
        includeUnparsed?: boolean;

        /**
         * {Object} Options to pass to the formidable multipart parser
         */
        formidable?: IKoaBodyFormidableOptions;

        /**
         * {Function} Custom error handle, if throw an error, you can customize the response - onError(error, context), default will throw
         */
        onError?: (err: Error, ctx: Koa.Context) => void;

        /**
         * {Boolean} If enabled, don't parse GET, HEAD, DELETE requests, default true
         *
         * GET, HEAD, and DELETE requests have no defined semantics for the request body,
         * but this doesn't mean they may not be valid in certain use cases.
         * koa-body is strict by default
         *
         * see http://tools.ietf.org/html/draft-ietf-httpbis-p2-semantics-19#section-6.3
         */
        strict?: boolean;
    }
}

declare function koaBody (options?: koaBody.IKoaBodyOptions): Koa.Middleware<{}, {}>;

export = koaBody;