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import { describe, expect, it } from 'vitest'

import { AgentPromptRequestCorrelation } from './agent-prompt-request-correlation'

const PTY = 'pty-1'

const GENERATION = 1

function lifecycle(workingSequence: number) {

return { kind: 'lifecycle' as const, workingSequence }

}

function register(

correlation: AgentPromptRequestCorrelation,

requestId: string,

baselineWorkingSequence: number

): void {

correlation.register(PTY, {

generation: GENERATION,

requestId,

baselineWorkingSequence,

baselineExplicitWorkingStartedAt: null

})

}

describe('agent prompt request correlation', () => {

it('gives one lifecycle transition to exactly one queued request', () => {

const correlation = new AgentPromptRequestCorrelation()

register(correlation, 'first', 0)

register(correlation, 'second', 0)

expect(correlation.acceptTurnStart(PTY, GENERATION, 'first', 0, null, lifecycle(1))).toBe(true)

expect(correlation.acceptTurnStart(PTY, GENERATION, 'second', 0, null, lifecycle(1))).toBe(

false

)

expect(correlation.acceptTurnStart(PTY, GENERATION, 'second', 0, null, lifecycle(2))).toBe(true)

})

it('still allocates a later request when an earlier one has no free sequence', () => {

const correlation = new AgentPromptRequestCorrelation()

register(correlation, 'owner-of-6', 5)

expect(correlation.acceptTurnStart(PTY, GENERATION, 'owner-of-6', 5, null, lifecycle(6))).toBe(

true

)

// `late` can only take sequence 6, which is taken; `early` can still take 3.

register(correlation, 'late', 5)

register(correlation, 'early', 2)

expect(correlation.acceptTurnStart(PTY, GENERATION, 'early', 2, null, lifecycle(6))).toBe(true)

expect(correlation.acceptTurnStart(PTY, GENERATION, 'late', 5, null, lifecycle(6))).toBe(false)

})

it('reserves a hook turn start for the oldest eligible request', () => {

const correlation = new AgentPromptRequestCorrelation()

register(correlation, 'oldest', 0)

register(correlation, 'newest', 0)

const hook = { kind: 'hook' as const, workingStartedAt: 500 }

expect(correlation.acceptTurnStart(PTY, GENERATION, 'newest', 0, null, hook)).toBe(false)

expect(correlation.acceptTurnStart(PTY, GENERATION, 'oldest', 0, null, hook)).toBe(true)

expect(correlation.acceptTurnStart(PTY, GENERATION, 'newest', 0, null, hook)).toBe(false)

})

it('refuses a request the PTY no longer holds', () => {

const correlation = new AgentPromptRequestCorrelation()

register(correlation, 'cleared', 0)

correlation.clearForPty(PTY)

expect(correlation.acceptTurnStart(PTY, GENERATION, 'cleared', 0, null, lifecycle(1))).toBe(

false

)

})

it('scopes claims to the generation that recorded them', () => {

const correlation = new AgentPromptRequestCorrelation()

register(correlation, 'gen-1', 0)

correlation.register(PTY, {

generation: 2,

requestId: 'gen-2',

baselineWorkingSequence: 0,

baselineExplicitWorkingStartedAt: null

})

expect(correlation.acceptTurnStart(PTY, GENERATION, 'gen-1', 0, null, lifecycle(1))).toBe(true)

expect(correlation.acceptTurnStart(PTY, 2, 'gen-2', 0, null, lifecycle(1))).toBe(true)

})

})