package kernel.ps;

import kernel.log.Log;
import kernel.ps.ProcessHandle.HandleConfig;

using tink.CoreApi;

typedef PID = Int;

class ProcessManager {
	private static final processList = new Map<PID, ProcessHandle>();

	public static function run(process:IProcess, config:HandleConfig):PID {
		var pid = createPID();
		var handle = new ProcessHandle(config, pid);

		processList.set(pid, handle);

		try {
			process.run(handle);
		} catch (e:Dynamic) {
			Log.error("Error while running process: " + e);
			handle.close(false);
		}

		return pid;
	}

	public static function kill(pid:PID) {
		if (!processList.exists(pid)) {
			Log.warn("Trying to kill non-existing process: " + pid);
			return;
		}

		var handle = processList.get(pid);

		handle.close();
	}

	private static function createPID():PID {
		// TODO: better PID generation

		// generate a random PID
		return Math.ceil(Math.random() * 1000000);
	}

	@:allow(kernel.ui.WindowManager)
	private static function getProcess(pid:PID):Null<ProcessHandle> {
		return processList.get(pid);
	}

	@:allow(kernel.ps.ProcessHandle)
	private static function removeProcess(pid:PID):Void {
		processList.remove(pid);
	}

	public static function listProcesses():Array<PID> {
		return [for (pid in processList.keys()) pid];
	}
}