import { Router } from 'express';
import type { APIExecuter, APINamespace } from './base.js';

export function buildAPISystem<N extends APINamespace, Q extends APIExecuter<any, any, any>>(api: N | Q): Router {
    const router = Router();
    for (const [key, value] of Object.entries(api)) {
        if (typeof value === 'function') {
            const executer = new value() as Q;
            if(!executer.reqType){
                throw new Error('APIExecuter.reqType is not defined');
            }
            if(!Array.isArray(executer.reqType)){
                router[executer.reqType](key, async (req, res) => {
                    await executer.run(req, res);
                });
                continue;
            }
            for(const type of new Set(executer.reqType)){
                router[type](key, async (req, res) => {
                    await executer.run(req, res);
                });
            }
        } else {
            router.use(key, buildAPISystem(value));
        }
    }
    return router;
}