import * as fs from "node:fs";

function runCommand(command: string, args: string[]): string | null {
	try {
		const result = Bun.spawnSync([command, ...args], { stdout: "pipe", stderr: "pipe" });
		if (result.exitCode !== 0) return null;
		return result.stdout.toString("utf-8").trim();
	} catch {
		return null;
	}
}

export function detectHostAvx2Support(): boolean {
	if (process.arch !== "x64") return false;

	if (process.platform === "linux") {
		try {
			const cpuInfo = fs.readFileSync("/proc/cpuinfo", "utf8");
			return /\bavx2\b/i.test(cpuInfo);
		} catch {
			return false;
		}
	}

	if (process.platform === "darwin") {
		const leaf7 = runCommand("sysctl", ["-n", "machdep.cpu.leaf7_features"]);
		if (leaf7 && /\bAVX2\b/i.test(leaf7)) return true;
		const features = runCommand("sysctl", ["-n", "machdep.cpu.features"]);
		return Boolean(features && /\bAVX2\b/i.test(features));
	}

	if (process.platform === "win32") {
		const output = runCommand("powershell.exe", [
			"-NoProfile",
			"-NonInteractive",
			"-Command",
			"[System.Runtime.Intrinsics.X86.Avx2]::IsSupported",
		]);
		return output?.toLowerCase() === "true";
	}

	return false;
}