import fs from 'node:fs';

import os from 'node:os';

import path from 'node:path';

import { runCmdSync } from '@agent-device/host-kit/command';

import { REPO_ROOT, type PerfConfig } from './config.ts';

import type { RunMetadata } from './types.ts';

function capture(cmd: string, args: string[]): string | undefined {

try {

const result = runCmdSync(cmd, args, { cwd: REPO_ROOT, allowFailure: true });

return result.exitCode === 0 ? result.stdout.trim() : undefined;

} catch {

return undefined;

}

}

function readVersion(): string {

try {

const pkg = JSON.parse(fs.readFileSync(path.join(REPO_ROOT, 'package.json'), 'utf8'));

return typeof pkg.version === 'string' ? pkg.version : 'unknown';

} catch {

return 'unknown';

}

}

function simulator(udid: string): { name: string; runtime?: string } | undefined {

const raw = capture('xcrun', ['simctl', 'list', 'devices', '--json']);

if (!raw) return undefined;

const devices = (JSON.parse(raw) as { devices: Record<string, { udid: string; name: string }[]> })

.devices;

for (const [runtime, list] of Object.entries(devices)) {

const device = list.find((entry) => entry.udid === udid);

if (device) return { name: device.name, runtime: runtime.split('.').pop() };

}

return undefined;

}

/** Records what the numbers depend on: source, toolchain, host, and device. */

export function collectMetadata(cfg: PerfConfig, deviceName: string): RunMetadata {

const env = process.env;

const sim = cfg.platform === 'ios' && cfg.udid ? simulator(cfg.udid) : undefined;

const cpus = os.cpus();

return {

commit: env.GITHUB_SHA ?? capture('git', ['rev-parse', 'HEAD']) ?? 'unknown',

ref: env.GITHUB_REF_NAME ?? capture('git', ['rev-parse', '--abbrev-ref', 'HEAD']),

runId: env.GITHUB_RUN_ID,

runAttempt: env.GITHUB_RUN_ATTEMPT,

agentDeviceVersion: readVersion(),

host: {

os: `${os.type()} ${os.release()}`,

arch: os.arch(),

cpu: cpus[0]?.model ?? 'unknown',

cores: cpus.length,

memoryGb: Math.round(os.totalmem() / 1024 ** 3),

},

xcode:

cfg.platform === 'ios'

? capture('xcodebuild', ['-version'])?.replaceAll('\n', ' ')

: undefined,

node: process.version,

device: {

name: sim?.name ?? deviceName,

udid: cfg.udid,

serial: cfg.serial,

runtime: sim?.runtime,

},

fixture: cfg.platform === 'ios' ? { appId: cfg.appId, appPath: cfg.appPath } : undefined,

};

}