import * as _ from "lodash";
import * as Hapi from "hapi";
import { Bundle, App, LogLevel } from "protoculture";
import { Route, ActionRoute, DirectoryRoute, FileRoute } from "./Route";
import { Handler } from "./Handler";


export class Dispatcher {

    public constructor(protected app: App) {

    }

    // Note: This is the root async context.
    public async dispatch(request: Hapi.Request, reply: Hapi.Base_Reply, route: ActionRoute, symbol: symbol) {

        const childContainer = await this.app.bundle.bootChild();

        const actionTarget = childContainer.get(symbol);
        const action: Handler = actionTarget[route.actionMethod] || actionTarget;

        try {

            await action(request, reply, route);
        }
        catch (error) {

            // ToDo: Certain types of automatic responses could be generated by catching here and forwarding to an error handler.
            this.error(error, request, reply, route);
        }
    }

    protected error(error: any, request: Hapi.Request, reply: Hapi.Base_Reply, route: Route) {

        if (_.isError(error)) {

            const {name, message, stack} = error;
            request.log(["error", "uncaught"], {name, message, stack});
        }
        else {

            request.log(["error", "uncaught"], {name: "Error", message: error});
            error = new Error(error);
        }

        reply(error);
    }
}