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import { randomBytes } from 'node:crypto'

import { setTimeout as delay } from 'node:timers/promises'

import { z } from 'zod'

import { spawnProcess } from '@orca/process-host'

import {

forceTerminateProcessTree,

signalProcessTree

} from '@orca/process-host/process-tree-termination'

import { withTimeout } from '../../shared/promise-timeout-fallback'

import { createOutputSink } from '@orca/process-host/bounded-output-sink'

import { readFetchResponseJsonWithinLimit } from '../../shared/fetch-response-body'

import { cancelUnreadResponseBody } from '../lib/unread-response-body'

import type { ChildProcessHandle } from '@orca/process-host/process-spec'

import { createProviderSpawnSpec } from '../provider-process/provider-process-supervisor'

import { stopSupervisedChildProcess } from '../provider-process/supervised-child-process-stop'

import { guardSupervisedProviderGroup } from '../provider-process/provider-group-orphan-guard'

const OPENCODE_PREFLIGHT_KILL_SITE = 'opencode-launch-model-preflight'

// A supervisor's pipes are its own, so they close as it exits.

const SUPERVISOR_PIPE_CLOSE_MS = 1_000

const model = z.object({ id: z.string(), providerID: z.string() })

const availableModel = model.extend({ enabled: z.boolean() })

const agent = z.object({

id: z.string(),

mode: z.enum(['primary', 'subagent', 'all']),

hidden: z.boolean(),

model: model.optional()

})

const location = z.object({ directory: z.string() })

const modelResponse = z.object({ location, data: availableModel.array() })

const agentResponse = z.object({ location, data: agent.array() })

const defaultModelResponse = z.object({

location,

data: availableModel.nullable()

})

const configResponse = z.array(

z.object({

type: z.enum(['directory', 'document']),

info: z.object({ default_agent: z.string().optional() }).optional()

})

)

export type OpenCodeLaunchModelContext = {

primaryAgent: string

availableModels: string[]

primaryModel: string | null

}

export function parseOpenCodeLaunchModelContext(options: {

directory: string

models: unknown

agents: unknown

defaultModel: unknown

config: unknown

}): OpenCodeLaunchModelContext | null {

const models = modelResponse.safeParse(options.models)

const agents = agentResponse.safeParse(options.agents)

const defaultModel = defaultModelResponse.safeParse(options.defaultModel)

const config = configResponse.safeParse(options.config)

if (

!models.success ||

!agents.success ||

!defaultModel.success ||

!config.success ||

models.data.location.directory !== options.directory ||

agents.data.location.directory !== options.directory ||

defaultModel.data.location.directory !== options.directory ||

!defaultModel.data.data?.enabled ||

agents.data.data.length === 0

) {

return null

}

// Installed 2.0.16 returns the selected default first; newer source has a different order.

const primary = agents.data.data.find((item) => item.mode !== 'subagent' && !item.hidden)

const configured = config.data.reduce<string | undefined>(

(value, entry) => entry.info?.default_agent ?? value,

undefined

)

const available = models.data.data.filter((item) => item.enabled)

if (

!primary ||

(configured !== undefined && primary.id !== configured) ||

!available.some(

(item) =>

item.id === defaultModel.data.data?.id &&

item.providerID === defaultModel.data.data?.providerID

)

) {

return null

}

return {

primaryAgent: primary.id,

availableModels: available.map((item) => `${item.providerID}/${item.id}`),

primaryModel: primary.model ? `${primary.model.providerID}/${primary.model.id}` : null

}

}

export async function probeOpenCodeLaunchModelContext(options: {

executable: string

cwd: string

env: NodeJS.ProcessEnv

signal?: AbortSignal

expectedPrimaryAgent?: string

expectedPrimaryModel?: string

}): Promise<OpenCodeLaunchModelContext | null> {

const password = randomBytes(32).toString('base64url')

const spawnSpec = createProviderSpawnSpec(

{

command: options.executable,

args: ['serve', '--hostname', '127.0.0.1', '--port', '0'],

cwd: options.cwd

},

{

...options.env,

OPENCODE_SERVER_USERNAME: 'opencode',

OPENCODE_SERVER_PASSWORD: password

},

process.platform,

// `opencode serve` never exits on stdin end, so on POSIX only its supervisor stops it with Orca.

{ lifetime: 'one-shot' }

)

const child = spawnProcess({

program: spawnSpec.program,

args: spawnSpec.args,

cwd: options.cwd,

env: spawnSpec.env,

detached: true,

stdio: ['pipe', 'pipe', 'pipe', ...spawnSpec.groupReportStdio]

})

guardSupervisedProviderGroup(child, {

site: OPENCODE_PREFLIGHT_KILL_SITE,

supervised: spawnSpec.supervised

})

const output = createOutputSink(4096)

let childClosed = false

let rootExited = false

const closed = new Promise<boolean>((resolve) => {

child.once('close', () => {

childClosed = true

resolve(true)

})

})

let failed = false

child.on('error', () => {

failed = true

})

child.once('exit', () => {

rootExited = true

failed = true

})

child.stdout.on('data', output.write)

child.stdout.on('error', () => {

failed = true

})

child.stderr.on('error', () => {

failed = true

})

child.stderr.resume()

child.stdin.on('error', () => {

failed = true

})

child.stdin.end()

const signal = AbortSignal.any([

AbortSignal.timeout(10_000),

...(options.signal ? [options.signal] : [])

])

let context: OpenCodeLaunchModelContext | null = null

let stopped = false

try {

while (!failed && !signal.aborted && !output.truncated()) {

const address = output

.text()

.match(/^server listening on (http:\/\/127\.0\.0\.1:\d+)\s*$/m)?.[1]

if (address) {

const read = async (endpoint: string): Promise<unknown> => {

const url = new URL(`/api/${endpoint}`, address)

url.searchParams.set('location[directory]', options.cwd)

const response = await fetch(url, {

headers: {

Authorization: `Basic ${Buffer.from(`opencode:${password}`).toString('base64')}`

},

redirect: 'error',

signal

})

try {

if (!response.ok) {

throw new Error('OpenCode model preflight refused')

}

return await readFetchResponseJsonWithinLimit<unknown>(response, 1_048_576)

} finally {

await cancelUnreadResponseBody(response)

}

}

const [models, agents, defaultModel, config] = await Promise.all([

read('model'),

read('agent'),

read('model/default'),

read('config')

])

context = parseOpenCodeLaunchModelContext({

directory: options.cwd,

models,

agents,

defaultModel,

config

})

if (

context &&

(!options.expectedPrimaryAgent ||

context.primaryAgent === options.expectedPrimaryAgent) &&

(!options.expectedPrimaryModel || context.primaryModel === options.expectedPrimaryModel)

) {

break

}

context = null

}

await delay(100, undefined, { signal })

}

} catch {

context = null

} finally {

if (spawnSpec.supervised) {

stopped = await stopSupervisedPreflight(child, closed)

} else {

if (!childClosed && !rootExited) {

await signalProcessTree(child, 'SIGTERM')

}

stopped = childClosed || (await withTimeout(closed, 1_500, false))

// A reaped root's PID can be reused while descendants still hold its pipes.

if (!stopped && !rootExited) {

stopped = await forceTerminateProcessTree(child)

}

}

}

return stopped ? context : null

}

/**

* True only when the server's group is proven gone: the supervisor exited on its own stop or

* relayed the server's exit. A forced stop proves nothing: its teardown reaches the supervisor's

* group, not the server's own detached group. Exit 1 can be a group reap that failed.

*/

async function stopSupervisedPreflight(

child: ChildProcessHandle,

closed: Promise<boolean>

): Promise<boolean> {

if (!child.pid) {

// Never started, so there is nothing to stop.

return true

}

const { root, tree } = await stopSupervisedChildProcess(child, {

site: OPENCODE_PREFLIGHT_KILL_SITE

})

const forced = tree !== null || child.signalCode === 'SIGKILL'

const failedReap = child.signalCode === null && child.exitCode === 1

if (root !== 'exited' || forced || failedReap) {

return false

}

return withTimeout(closed, SUPERVISOR_PIPE_CLOSE_MS, false)

}