// Regression coverage for issue #26526's claim that promptAsync's
// Effect.forkIn loses the request's InstanceRef/WorkspaceRef. It does not —
// forkIn preserves Context.Reference values via standard fiber inheritance.
//
// The companion claim that the streaming prompt handler "captures and
// provides" those services is true and load-bearing: Stream.fromEffect's
// body runs detached from the request fiber's context, so the explicit
// Effect.provideService calls there are required, not defensive duplication.

import { NodeHttpServer, NodeServices } from "@effect/platform-node"
import { Flag } from "@opencode-ai/core/flag/flag"
import { describe, expect } from "bun:test"
import { Deferred, Effect, Layer, Scope } from "effect"
import * as Stream from "effect/Stream"
import { HttpClient, HttpRouter, HttpServerResponse } from "effect/unstable/http"
import * as Socket from "effect/unstable/socket/Socket"
import { mkdir } from "node:fs/promises"
import { registerAdapter } from "../../src/control-plane/adapters"
import type { WorkspaceAdapter } from "../../src/control-plane/types"
import { Workspace } from "../../src/control-plane/workspace"
import { InstanceRef, WorkspaceRef } from "../../src/effect/instance-ref"
import { InstanceBootstrap } from "../../src/project/bootstrap"
import { InstanceLayer } from "../../src/project/instance-layer"
import { InstanceStore } from "../../src/project/instance-store"
import { Project } from "../../src/project/project"
import { instanceRouterMiddleware } from "../../src/server/routes/instance/httpapi/middleware/instance-context"
import { workspaceRouterMiddleware } from "../../src/server/routes/instance/httpapi/middleware/workspace-routing"
import { resetDatabase } from "../fixture/db"
import { disposeAllInstances, tmpdirScoped } from "../fixture/fixture"
import { testEffect } from "../lib/effect"

const testStateLayer = Layer.effectDiscard(
  Effect.gen(function* () {
    const originalWorkspaces = Flag.OPENCODE_EXPERIMENTAL_WORKSPACES
    yield* Effect.promise(() => resetDatabase())
    Flag.OPENCODE_EXPERIMENTAL_WORKSPACES = true
    yield* Effect.addFinalizer(() =>
      Effect.promise(async () => {
        Flag.OPENCODE_EXPERIMENTAL_WORKSPACES = originalWorkspaces
        await disposeAllInstances()
        await resetDatabase()
      }),
    )
  }),
)

const workspaceLayer = Workspace.defaultLayer.pipe(
  Layer.provide(InstanceStore.defaultLayer),
  Layer.provide(InstanceBootstrap.defaultLayer),
)

const it = testEffect(
  Layer.mergeAll(
    testStateLayer,
    NodeHttpServer.layerTest,
    NodeServices.layer,
    InstanceLayer.layer,
    Project.defaultLayer,
    workspaceLayer,
  ),
)

const instanceContextTestLayer = instanceRouterMiddleware
  .combine(workspaceRouterMiddleware)
  .layer.pipe(Layer.provide(Socket.layerWebSocketConstructorGlobal))

const localAdapter = (directory: string): WorkspaceAdapter => ({
  name: "Local Test",
  description: "Create a local test workspace",
  configure: (info) => ({ ...info, name: "local-test", directory }),
  create: async () => {
    await mkdir(directory, { recursive: true })
  },
  async remove() {},
  target: () => ({ type: "local" as const, directory }),
})

const setupWorkspace = (kind: string) =>
  Effect.gen(function* () {
    const dir = yield* tmpdirScoped({ git: true })
    yield* Project.use.fromDirectory(dir)
    const projectID = yield* Project.Service.use((svc) => svc.fromDirectory(dir).pipe(Effect.map((p) => p.project.id)))
    registerAdapter(projectID, kind, localAdapter(dir))
    const workspace = yield* Workspace.Service.use((svc) =>
      svc.create({ type: kind, branch: null, extra: null, projectID }),
    )
    return { dir, workspace }
  })

type Capture = { directory?: string; workspaceID?: string }

const captureInstance = Effect.gen(function* () {
  const instance = yield* InstanceRef
  const workspaceID = yield* WorkspaceRef
  return { directory: instance?.directory, workspaceID } satisfies Capture
})

describe("HttpApi handler context inheritance", () => {
  // Mirrors handlers/session.ts:281 promptAsync. The forked fiber inherits
  // the request's Context — including InstanceRef and WorkspaceRef provided
  // by InstanceContextMiddleware — without any explicit re-provide.
  it.live("Effect.forkIn preserves InstanceRef/WorkspaceRef across the fork", () =>
    Effect.gen(function* () {
      const { dir, workspace } = yield* setupWorkspace("local-fork")
      const capture = yield* Deferred.make<Capture>()

      yield* HttpRouter.add(
        "POST",
        "/fork-probe",
        Effect.gen(function* () {
          const scope = yield* Scope.Scope
          yield* Effect.gen(function* () {
            yield* Deferred.succeed(capture, yield* captureInstance)
          }).pipe(Effect.forkIn(scope, { startImmediately: true }))
          return HttpServerResponse.empty({ status: 204 })
        }),
      ).pipe(Layer.provide(instanceContextTestLayer), HttpRouter.serve, Layer.build)

      const response = yield* HttpClient.post(
        `/fork-probe?directory=${encodeURIComponent(dir)}&workspace=${encodeURIComponent(workspace.id)}`,
      )
      expect(response.status).toBe(204)

      const observed = yield* Deferred.await(capture).pipe(Effect.timeout("2 seconds"))
      expect(observed.directory).toBe(dir)
      expect(observed.workspaceID).toBe(workspace.id)
    }),
  )

  // Mirrors handlers/session.ts:255 prompt — the streaming handler reads
  // InstanceRef/WorkspaceRef in the request fiber and re-provides them to
  // the Stream.fromEffect body. This test locks in why the explicit
  // provides are required: without them the stream body sees undefined.
  it.live("Stream.fromEffect body needs explicit provides — inheritance does not carry through", () =>
    Effect.gen(function* () {
      const { dir, workspace } = yield* setupWorkspace("local-stream")
      const withoutCapture = yield* Deferred.make<Capture>()
      const withCapture = yield* Deferred.make<Capture>()

      yield* HttpRouter.add(
        "POST",
        "/stream-probe-without",
        Effect.gen(function* () {
          return HttpServerResponse.stream(
            Stream.fromEffect(
              Effect.gen(function* () {
                yield* Deferred.succeed(withoutCapture, yield* captureInstance)
                return ""
              }),
            ).pipe(Stream.encodeText),
            { contentType: "application/json" },
          )
        }),
      ).pipe(Layer.provide(instanceContextTestLayer), HttpRouter.serve, Layer.build)

      yield* HttpRouter.add(
        "POST",
        "/stream-probe-with",
        Effect.gen(function* () {
          const instance = yield* InstanceRef
          const workspaceID = yield* WorkspaceRef
          return HttpServerResponse.stream(
            Stream.fromEffect(
              Effect.gen(function* () {
                yield* Deferred.succeed(withCapture, yield* captureInstance)
                return ""
              }).pipe(Effect.provideService(InstanceRef, instance), Effect.provideService(WorkspaceRef, workspaceID)),
            ).pipe(Stream.encodeText),
            { contentType: "application/json" },
          )
        }),
      ).pipe(Layer.provide(instanceContextTestLayer), HttpRouter.serve, Layer.build)

      const queryString = `directory=${encodeURIComponent(dir)}&workspace=${encodeURIComponent(workspace.id)}`
      const responseWithout = yield* HttpClient.post(`/stream-probe-without?${queryString}`)
      yield* responseWithout.text
      const responseWith = yield* HttpClient.post(`/stream-probe-with?${queryString}`)
      yield* responseWith.text

      const without = yield* Deferred.await(withoutCapture).pipe(Effect.timeout("2 seconds"))
      expect(without.directory).toBeUndefined()
      expect(without.workspaceID).toBeUndefined()

      const withProvide = yield* Deferred.await(withCapture).pipe(Effect.timeout("2 seconds"))
      expect(withProvide.directory).toBe(dir)
      expect(withProvide.workspaceID).toBe(workspace.id)
    }),
  )
})