import { assert, describe, it } from "@effect/vitest"
import { Context, Effect, Layer } from "effect"
import * as Exit from "effect/Exit"
import * as LayerRef from "effect/LayerRef"
import * as Scope from "effect/Scope"

class Resource extends Context.Service<Resource, { readonly id: number }>()("LayerRefTest/Resource") {}

const makeLayer = (acquired: Array<number>, released: Array<number>) =>
  Layer.effect(Resource)(
    Effect.acquireRelease(
      Effect.sync(() => {
        const id = acquired.length + 1
        acquired.push(id)
        return { id }
      }),
      (resource) =>
        Effect.sync(() => {
          released.push(resource.id)
        })
    )
  )

describe("LayerRef", () => {
  it.effect("make lazily acquires and releases resources", () =>
    Effect.gen(function*() {
      const acquired: Array<number> = []
      const released: Array<number> = []
      const refScope = yield* Scope.make()
      const ref = yield* LayerRef.make(makeLayer(acquired, released)).pipe(Scope.provide(refScope))

      assert.deepStrictEqual(acquired, [])
      assert.deepStrictEqual(released, [])

      const context = yield* Effect.scoped(ref.contextEffect)
      assert.strictEqual(Context.get(context, Resource).id, 1)
      assert.deepStrictEqual(acquired, [1])
      assert.deepStrictEqual(released, [1])

      const contextFromLayer = yield* Effect.scoped(Layer.build(ref.get))
      assert.strictEqual(Context.get(contextFromLayer, Resource).id, 2)
      assert.deepStrictEqual(acquired, [1, 2])
      assert.deepStrictEqual(released, [1, 2])

      yield* Scope.close(refScope, Exit.void)
      assert.deepStrictEqual(released, [1, 2])
    }))

  it.effect("invalidate releases an idle resource and acquires a fresh one", () =>
    Effect.gen(function*() {
      const acquired: Array<number> = []
      const released: Array<number> = []
      const refScope = yield* Scope.make()
      const ref = yield* LayerRef.make(makeLayer(acquired, released), {
        idleTimeToLive: "1 minute"
      }).pipe(Scope.provide(refScope))

      const context = yield* Effect.scoped(ref.contextEffect)
      assert.strictEqual(Context.get(context, Resource).id, 1)
      assert.deepStrictEqual(acquired, [1])
      assert.deepStrictEqual(released, [])

      const cachedContext = yield* Effect.scoped(ref.contextEffect)
      assert.strictEqual(Context.get(cachedContext, Resource).id, 1)
      assert.deepStrictEqual(acquired, [1])
      assert.deepStrictEqual(released, [])

      yield* ref.invalidate
      assert.deepStrictEqual(released, [1])

      const freshContext = yield* Effect.scoped(ref.contextEffect)
      assert.strictEqual(Context.get(freshContext, Resource).id, 2)
      assert.deepStrictEqual(acquired, [1, 2])
      assert.deepStrictEqual(released, [1])

      yield* Scope.close(refScope, Exit.void)
      assert.deepStrictEqual(released, [1, 2])
    }))

  it.effect("preload acquires the resource when the LayerRef is created", () =>
    Effect.gen(function*() {
      const acquired: Array<number> = []
      const released: Array<number> = []
      const refScope = yield* Scope.make()
      const ref = yield* LayerRef.make(makeLayer(acquired, released), {
        idleTimeToLive: "1 minute",
        preload: true
      }).pipe(Scope.provide(refScope))

      assert.deepStrictEqual(acquired, [1])
      assert.deepStrictEqual(released, [])

      const context = yield* Effect.scoped(ref.contextEffect)
      assert.strictEqual(Context.get(context, Resource).id, 1)
      assert.deepStrictEqual(acquired, [1])
      assert.deepStrictEqual(released, [])

      yield* Scope.close(refScope, Exit.void)
      assert.deepStrictEqual(released, [1])
    }))

  it.effect("Service exposes layer, get, contextEffect, and invalidate", () =>
    Effect.gen(function*() {
      const acquired: Array<number> = []
      const released: Array<number> = []

      class ResourceRef extends LayerRef.Service<ResourceRef>()("LayerRefTest/ResourceRef", {
        layer: makeLayer(acquired, released),
        idleTimeToLive: "1 minute"
      }) {}

      yield* Effect.gen(function*() {
        const context = yield* Effect.scoped(ResourceRef.contextEffect)
        assert.strictEqual(Context.get(context, Resource).id, 1)

        const contextFromLayer = yield* Effect.scoped(Layer.build(ResourceRef.get))
        assert.strictEqual(Context.get(contextFromLayer, Resource).id, 1)
        assert.deepStrictEqual(acquired, [1])
        assert.deepStrictEqual(released, [])

        yield* ResourceRef.invalidate
        assert.deepStrictEqual(released, [1])

        const freshContext = yield* Effect.scoped(ResourceRef.contextEffect)
        assert.strictEqual(Context.get(freshContext, Resource).id, 2)
        assert.deepStrictEqual(acquired, [1, 2])
      }).pipe(Effect.provide(ResourceRef.layer))

      assert.deepStrictEqual(released, [1, 2])
    }))
})