import { beforeEach, describe, expect, test } from "bun:test"
import {
  createMessageQueueTarget,
  getMessageQueueKey,
  migrateMessageQueueState,
  parseMessageQueueKey,
  useMessageQueueStore,
} from "./messageQueueStore"

beforeEach(() => {
  useMessageQueueStore.setState({ queuedMessages: {}, quarantinedLegacyMessages: {}, sendingIds: {} })
})

describe("message queue runtime ownership", () => {
  test("isolates colliding session IDs by runtime and directory", () => {
    const a = createMessageQueueTarget("session-1", "/repo", "runtime-a")!
    const b = createMessageQueueTarget("session-1", "/repo", "runtime-b")!
    useMessageQueueStore.getState().addToQueue(a, { content: "from A" })
    useMessageQueueStore.getState().addToQueue(b, { content: "from B" })

    expect(useMessageQueueStore.getState().getQueueForTarget(a)[0]?.content).toBe("from A")
    expect(useMessageQueueStore.getState().getQueueForTarget(b)[0]?.content).toBe("from B")
  })

  test("round trips a composite queue key", () => {
    const target = createMessageQueueTarget("session-1", "/repo", "runtime-a")!
    expect(parseMessageQueueKey(getMessageQueueKey(target))).toEqual(target)
  })

  test("quarantines legacy session-only queues instead of activating them", () => {
    const migrated = migrateMessageQueueState({
      queuedMessages: {
        "session-1": [{ id: "queued-1", content: "legacy", createdAt: 1 }],
      },
    }, 1)

    expect(migrated.queuedMessages).toEqual({})
    expect(migrated.quarantinedLegacyMessages?.["session-1"]?.[0]?.content).toBe("legacy")
  })

  test("bounds each queue to the newest 20 messages", () => {
    const target = createMessageQueueTarget("session-1", "/repo", "runtime-a")!
    for (let index = 0; index < 25; index += 1) {
      useMessageQueueStore.getState().addToQueue(target, { content: `message-${index}` })
    }

    const queue = useMessageQueueStore.getState().getQueueForTarget(target)
    expect(queue).toHaveLength(20)
    expect(queue[0]?.content).toBe("message-5")
  })
})

describe("in-flight queued sends", () => {
  test("hides a dispatched message from the sendable queue but keeps it visible", () => {
    const target = createMessageQueueTarget("session-1", "/repo", "runtime-a")!
    const store = useMessageQueueStore.getState()
    store.addToQueue(target, { content: "first" })
    store.addToQueue(target, { content: "second" })
    const [first] = useMessageQueueStore.getState().getQueueForTarget(target)

    useMessageQueueStore.getState().markSending(target, first.id)

    expect(useMessageQueueStore.getState().getQueueForTarget(target)).toHaveLength(2)
    const sendable = useMessageQueueStore.getState().getSendableQueue(target)
    expect(sendable).toHaveLength(1)
    expect(sendable[0]?.content).toBe("second")

    useMessageQueueStore.getState().clearSending(target, first.id)
    expect(useMessageQueueStore.getState().getSendableQueue(target)).toHaveLength(2)
    expect(useMessageQueueStore.getState().sendingIds).toEqual({})
  })

  test("clearQueue retains a message whose send is still awaiting the server", () => {
    const target = createMessageQueueTarget("session-1", "/repo", "runtime-a")!
    const store = useMessageQueueStore.getState()
    store.addToQueue(target, { content: "in flight" })
    store.addToQueue(target, { content: "merged by composer" })
    const [inFlight] = useMessageQueueStore.getState().getQueueForTarget(target)
    useMessageQueueStore.getState().markSending(target, inFlight.id)

    useMessageQueueStore.getState().clearQueue(target)

    const remaining = useMessageQueueStore.getState().getQueueForTarget(target)
    expect(remaining).toHaveLength(1)
    expect(remaining[0]?.id).toBe(inFlight.id)
  })

  test("clearQueue drops everything once no send is in flight", () => {
    const target = createMessageQueueTarget("session-1", "/repo", "runtime-a")!
    useMessageQueueStore.getState().addToQueue(target, { content: "queued" })

    useMessageQueueStore.getState().clearQueue(target)

    expect(useMessageQueueStore.getState().getQueueForTarget(target)).toHaveLength(0)
  })
})