import { Effect, Layer, ManagedRuntime } from "effect"
import * as ServiceMap from "effect/ServiceMap"
import { Instance } from "@/project/instance"
import { Context } from "@/util/context"
import { InstanceRef } from "./instance-ref"

export const memoMap = Layer.makeMemoMapUnsafe()

function attach<A, E, R>(effect: Effect.Effect<A, E, R>): Effect.Effect<A, E, R> {
  try {
    const ctx = Instance.current
    return Effect.provideService(effect, InstanceRef, ctx)
  } catch (err) {
    if (!(err instanceof Context.NotFound)) throw err
  }
  return effect
}

export function makeRuntime<I, S, E>(service: ServiceMap.Service<I, S>, layer: Layer.Layer<I, E>) {
  let rt: ManagedRuntime.ManagedRuntime<I, E> | undefined
  const getRuntime = () => (rt ??= ManagedRuntime.make(layer, { memoMap }))

  return {
    runSync: <A, Err>(fn: (svc: S) => Effect.Effect<A, Err, I>) => getRuntime().runSync(attach(service.use(fn))),
    runPromiseExit: <A, Err>(fn: (svc: S) => Effect.Effect<A, Err, I>, options?: Effect.RunOptions) =>
      getRuntime().runPromiseExit(attach(service.use(fn)), options),
    runPromise: <A, Err>(fn: (svc: S) => Effect.Effect<A, Err, I>, options?: Effect.RunOptions) =>
      getRuntime().runPromise(attach(service.use(fn)), options),
    runFork: <A, Err>(fn: (svc: S) => Effect.Effect<A, Err, I>) => getRuntime().runFork(attach(service.use(fn))),
    runCallback: <A, Err>(fn: (svc: S) => Effect.Effect<A, Err, I>) =>
      getRuntime().runCallback(attach(service.use(fn))),
  }
}