import { describe, expect } from "bun:test"
import { Effect, Exit, Scope } from "effect"
import { AgentV2 } from "@opencode-ai/core/agent"
import { testEffect } from "./lib/effect"

const it = testEffect(AgentV2.locationLayer)

describe("AgentV2", () => {
  it.effect("starts without agents", () =>
    Effect.gen(function* () {
      const agent = yield* AgentV2.Service

      expect(yield* agent.all()).toEqual([])
      expect(yield* agent.get(AgentV2.ID.make("build"))).toBeUndefined()
    }),
  )

  it.effect("materializes replayable agent transforms", () =>
    Effect.gen(function* () {
      const agent = yield* AgentV2.Service
      const id = AgentV2.ID.make("reviewer")
      const transform = yield* agent.transform()

      yield* transform((editor) =>
        editor.update(id, (info) => {
          info.description = "Reviews code"
          info.mode = "subagent"
        }),
      )

      expect(yield* agent.get(id)).toMatchObject({ id, description: "Reviews code", mode: "subagent" })
      expect((yield* agent.all()).map((info) => info.id)).toEqual([id])
    }),
  )

  it.effect("rebuilds state when a transform is replaced", () =>
    Effect.gen(function* () {
      const agent = yield* AgentV2.Service
      const id = AgentV2.ID.make("reviewer")
      const transform = yield* agent.transform()

      yield* transform((editor) =>
        editor.update(id, (info) => {
          info.description = "Old description"
          info.hidden = true
        }),
      )
      yield* transform((editor) =>
        editor.update(id, (info) => {
          info.description = "New description"
        }),
      )

      expect(yield* agent.get(id)).toMatchObject({ description: "New description", hidden: false })
    }),
  )

  it.effect("removes a transform contribution when its scope closes", () =>
    Effect.gen(function* () {
      const agent = yield* AgentV2.Service
      const id = AgentV2.ID.make("scoped")
      const scope = yield* Scope.make()
      const transform = yield* agent.transform().pipe(Scope.provide(scope))

      yield* transform((editor) => editor.update(id, () => {}))
      expect(yield* agent.get(id)).toBeDefined()

      yield* Scope.close(scope, Exit.void)
      expect(yield* agent.get(id)).toBeUndefined()
    }),
  )

  it.effect("applies direct agent updates", () =>
    Effect.gen(function* () {
      const agent = yield* AgentV2.Service
      const id = AgentV2.ID.make("build")

      yield* agent.update((editor) =>
        editor.update(id, (info) => {
          info.mode = "primary"
          info.hidden = true
        }),
      )

      expect(yield* agent.get(id)).toMatchObject({ id, mode: "primary", hidden: true })
    }),
  )

  it.effect("creates agents with runtime defaults and supports direct removal", () =>
    Effect.gen(function* () {
      const agent = yield* AgentV2.Service
      const id = AgentV2.ID.make("custom")

      yield* agent.update((editor) => editor.update(id, () => {}))
      expect(yield* agent.get(id)).toEqual(AgentV2.Info.empty(id))

      yield* agent.update((editor) => editor.remove(id))
      expect(yield* agent.get(id)).toBeUndefined()
    }),
  )
})