import { Config, Context, Effect, Layer } from "effect"
import type { Express } from "express"


export class ExpressApp extends Context.Tag("ExpressApp")<ExpressApp, Express>() {}


const importExpress = Effect.tryPromise({
    try: () => import("express"),
    catch: cause => new Error("Could not import 'express'. Make sure it is installed.", { cause }),
})

export const ExpressAppLive = (
    config: {
        readonly trustProxy?: Config.Config<boolean>
    } = {}
) => Layer.effect(ExpressApp, Effect.gen(function*() {
    const app = (yield* importExpress).default()
    app.set("trust proxy", yield* config.trustProxy || Config.succeed(false))
    return app
}))