import Cookie from './cookie';
/// <reference path="../typings/koa/koa.d.ts"/>
import * as Koa from 'koa';
const formy:any = require('formidable');
export enum MediaType {
    TEXT,
    JSON,
    FORM,
    MULTIPART
}
export enum HttpMethod {
    GET,
    POST,
    PUT,
    DELETE
}
export enum Charset {
    UTF8
}
export function mediaTypeToString(type: MediaType):string {
    switch (type) {
        case MediaType.TEXT:
            return 'text/plain';
        case MediaType.JSON:
            return 'application/json';
        case MediaType.FORM:
            return 'application/x-www-form-urlencoded';
        case MediaType.MULTIPART:
            return 'multipart/form-data';
    }
}
export interface Context extends Koa.IContext{
    cookie: Cookie;
}

/// <reference path="../node_modules/reflect-metadata/reflect-metadata.d.ts"/>
import 'reflect-metadata';
export class ReflectType {
    static TYPE:string = 'design:type';
    static PARAMETER_TYPE:string = 'design:paramtypes';
    static RETURN_TYPE:string = 'design:returntype';
}


export function parseMulti(ctx: Koa.IContext, opts?: any):Promise<any> {
    opts = opts || {};
    return new Promise<any>((resolve, reject) => {
        var fields = {};
        var files = {};
        var form = new formy.IncomingForm(opts);
        form
            .on('end', () => resolve({fields: fields, files: files}))
            .on('error', err => reject(err))
            .on('field', (field, value) => {
                if (fields[field]) {
                    if (Array.isArray(fields[field])) {
                        fields[field].push(value);
                    } else {
                        fields[field] = [fields[field], value];
                    }
                } else {
                    fields[field] = value;
                }
            })
            .on('file', (field, file) => {
                if (files[field]) {
                    if (Array.isArray(files[field])) {
                        files[field].push(file);
                    } else {
                        files[field] = [files[field], file];
                    }
                } else {
                    files[field] = file;
                }
            });
            if(opts.onFileBegin) {
                form.on('fileBegin', opts.onFileBegin);
            }
            form.parse(ctx.req);
     });
}