import { Config, Effect, Layer } from "effect"
import { ImportError } from "../../ImportError"
import { ExpressApp } from "../express"
import { TRPCUnknownContextCreator } from "./TRPCContextCreator"
import { TRPCAnyRouter } from "./TRPCRouter"


const importTRPCServerExpressAdapter = Effect.tryPromise({
    try: () => import("@trpc/server/adapters/express"),
    catch: cause => new ImportError({ path: "@trpc/server/adapters/express", cause }),
})

export const TRPCExpressRouteLive = (
    config: {
        readonly path: Config.Config<string>
    }
) => Layer.effectDiscard(Effect.gen(function*() {
    const { createExpressMiddleware } = yield* importTRPCServerExpressAdapter
    const app = yield* ExpressApp.ExpressApp

    app.use(yield* config.path,
        createExpressMiddleware({
            router:         yield* TRPCAnyRouter,
            createContext:  (yield* TRPCUnknownContextCreator).createExpressContext,
        })
    )
}))