#include "hasherthread.h"

#include <cassert>
#include <Log.h>

HasherThread::HasherThread(std::mutex& mutex, getNext_f next, doneCallback_f done) : mutex(mutex), getNext(next), doneCallback(done) {
	assert(getNext);
	assert(doneCallback);
}

HasherThread::~HasherThread() {
	stop();
	waitfor();
}

void HasherThread::start() {
	shouldrun = true;
	thread = std::thread(&HasherThread::threadLoop, this);
}

void HasherThread::stop() {
	shouldrun = false;
}

void HasherThread::waitfor() {
	if(thread.joinable()) {
		thread.join();
	}
}

void HasherThread::threadLoop() {
	while(shouldrun) {
		// get task
		std::shared_ptr<File> task;
		{
			std::lock_guard lock(mutex);
			task = getNext();
		}

		// no more tasks
		if(!task) {
			break;
		}

		// do the task
		Hash hash = task->createHash();

		// submit
		{
			std::lock_guard lock(mutex);
			doneCallback(std::move(hash), task);
		}
	}

	Log::info << "no more tasks, terminateing Hasherthread";
}