mattkrea/sequelize-handlers

'use strict';

const createController = require('./controller');
const { isSequelizeModel, applyMiddleware } = require('./utils');
const { errors } = require('./constants');
const dasherize = require('dasherize');
const express = require('express');

/**
 * Overrides default settings with those optionally provided at
 * the router level
 *
 * @param {Object} defaults - Default configuration
 * @param {Object} routerOptions - Global overrides
 */
const applyGlobalOptions = (defaults, routerOptions) => {
    if (routerOptions) {
        for (const option of Object.keys(routerOptions)) {
            switch (option) {
            case 'middleware':
                // Top-level middleware have already been applied
                break;
            case 'handlers':
                Object.assign(defaults[option], routerOptions[option]);
                break;
            default:
                defaults[option] = routerOptions[option];
            }
        }
    }
};

const createRouter = (controllerOptions, routerOptions) => {

    if (!Array.isArray(controllerOptions)) {
        throw new TypeError(`'controllerOptions' must be an array`);
    }

    const router = express.Router();

    // Append middleware to the start if we have any top-level included
    applyMiddleware(router, routerOptions);

    for (const controller of controllerOptions) {
        let model;
        let options = {
            handlers: {
                get: true,
                put: true,
                post: true,
                delete: true
            }
        };

        applyGlobalOptions(options, routerOptions);

        if (isSequelizeModel(controller)) {
            model = controller;
        } else if (isSequelizeModel(controller.model)) {
            model = controller.model;
            options = Object.assign(options, controller.options);
        } else {
            throw errors.invalidModel;
        }

        router.use(`/${dasherize(model.options.name.plural)}`, createController(model, options));
    }

    return router;
};

module.exports = createRouter;