import { isNil } from 'lodash/fp';
import Koa from 'koa';
import createError from 'http-errors';
import delegate from 'delegates';
import { formatHttpError } from '../errors.mjs';
import { errorMethodEntries } from './koa-methods.mjs';

const addCustomMethods = (app)=>{
    const delegator = delegate(app.context, 'response');
    /* errors */ for (const { code, statusName, methodName } of errorMethodEntries()){
        app.response[methodName] = function responseCode(response = statusName, details = {}) {
            const httpError = createError(code, response, {
                details
            });
            const { status, body } = formatHttpError(httpError);
            this.status = status;
            this.body = body;
        };
        delegator.method(methodName);
    }
    /* send, created, deleted */ app.response.send = function send(data, status = 200) {
        this.status = status;
        this.body = data;
    };
    app.response.created = function created(data) {
        this.status = 201;
        this.body = data;
    };
    app.response.deleted = function deleted(data) {
        if (isNil(data)) {
            this.status = 204;
        } else {
            this.status = 200;
            this.body = data;
        }
    };
    delegator.method('send').method('created').method('deleted');
    return app;
};
const createKoaApp = ({ proxy, keys })=>{
    const app = new Koa({
        proxy
    });
    app.keys = keys;
    addCustomMethods(app);
    return app;
};

export { createKoaApp as default };
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