#include <framework/devicehandlers/AssemblyBase.h>

AssemblyBase::AssemblyBase(object_id_t objectId, object_id_t parentId,
		uint16_t commandQueueDepth) :
		SubsystemBase(objectId, parentId, MODE_OFF, commandQueueDepth), internalState(
				STATE_NONE), recoveryState(RECOVERY_IDLE), recoveringDevice(
				childrenMap.end()), targetMode(MODE_OFF), targetSubmode(
				SUBMODE_NONE) {
	recoveryOffTimer.setTimeout(POWER_OFF_TIME_MS);
}

AssemblyBase::~AssemblyBase() {
}

ReturnValue_t AssemblyBase::handleCommandMessage(CommandMessage* message) {
	return handleHealthReply(message);
}

void AssemblyBase::performChildOperation() {
	if (isInTransition()) {
		handleChildrenTransition();
	} else {
		handleChildrenChanged();
	}
}

void AssemblyBase::startTransition(Mode_t mode, Submode_t submode) {
	doStartTransition(mode, submode);
	if (modeHelper.isForced()) {
		triggerEvent(FORCING_MODE, mode, submode);
	} else {
		triggerEvent(CHANGING_MODE, mode, submode);
	}
}

void AssemblyBase::doStartTransition(Mode_t mode, Submode_t submode) {
	targetMode = mode;
	targetSubmode = submode;
	internalState = STATE_SINGLE_STEP;
	ReturnValue_t result = commandChildren(mode, submode);
	if (result == NEED_SECOND_STEP) {
		internalState = STATE_NEED_SECOND_STEP;
	}
}

bool AssemblyBase::isInTransition() {
	return (internalState != STATE_NONE) || (recoveryState != RECOVERY_IDLE);
}

bool AssemblyBase::handleChildrenChanged() {
	if (childrenChangedMode) {
		ReturnValue_t result = checkChildrenState();
		if (result != RETURN_OK) {
			handleChildrenLostMode(result);
		}
		return true;
	} else {
		return handleChildrenChangedHealth();
	}
}

void AssemblyBase::handleChildrenLostMode(ReturnValue_t result) {
	triggerEvent(CANT_KEEP_MODE, mode, submode);
	startTransition(MODE_OFF, SUBMODE_NONE);
}

bool AssemblyBase::handleChildrenChangedHealth() {
	auto iter = childrenMap.begin();
	for (; iter != childrenMap.end(); iter++) {
		if (iter->second.healthChanged) {
			iter->second.healthChanged = false;
			break;
		}
	}
	if (iter == childrenMap.end()) {
		return false;
	}
	HealthState healthState = healthHelper.healthTable->getHealth(iter->first);
	if (healthState == HasHealthIF::NEEDS_RECOVERY) {
		triggerEvent(TRYING_RECOVERY);
		recoveryState = RECOVERY_STARTED;
		recoveringDevice = iter;
		doStartTransition(targetMode, targetSubmode);
	} else {
		triggerEvent(CHILD_CHANGED_HEALTH);
		doStartTransition(mode, submode);
	}
	if (modeHelper.isForced()) {
		triggerEvent(FORCING_MODE, targetMode, targetSubmode);
	}
	return true;
}

void AssemblyBase::handleChildrenTransition() {
	if (commandsOutstanding <= 0) {
		switch (internalState) {
		case STATE_NEED_SECOND_STEP:
			internalState = STATE_SECOND_STEP;
			commandChildren(targetMode, targetSubmode);
			return;
		case STATE_OVERWRITE_HEALTH: {
			internalState = STATE_SINGLE_STEP;
			ReturnValue_t result = commandChildren(mode, submode);
			if (result == NEED_SECOND_STEP) {
				internalState = STATE_NEED_SECOND_STEP;
			}
			return;
		}
		case STATE_NONE:
			//Valid state, used in recovery.
		case STATE_SINGLE_STEP:
		case STATE_SECOND_STEP:
			if (checkAndHandleRecovery()) {
				return;
			}
			break;
		}
		ReturnValue_t result = checkChildrenState();
		if (result == RETURN_OK) {
			handleModeReached();
		} else {
			handleModeTransitionFailed(result);
		}
	}
}

void AssemblyBase::handleModeReached() {
	internalState = STATE_NONE;
	setMode(targetMode, targetSubmode);
}

void AssemblyBase::handleModeTransitionFailed(ReturnValue_t result) {
//always accept transition to OFF, there is nothing we can do except sending an info event
//In theory this should never happen, but we would risk an infinite loop otherwise
	if (targetMode == MODE_OFF) {
		triggerEvent(CHILD_PROBLEMS, result);
		internalState = STATE_NONE;
		setMode(targetMode, targetSubmode);
	} else {
		if (handleChildrenChangedHealth()) {
			//If any health change is pending, handle that first.
			return;
		}
		triggerEvent(MODE_TRANSITION_FAILED, result);
		startTransition(MODE_OFF, SUBMODE_NONE);
	}
}

void AssemblyBase::sendHealthCommand(MessageQueueId_t sendTo,
		HealthState health) {
	CommandMessage command;
	HealthMessage::setHealthMessage(&command, HealthMessage::HEALTH_SET,
			health);
	if (commandQueue->sendMessage(sendTo, &command) == RETURN_OK) {
		commandsOutstanding++;
	}
}

ReturnValue_t AssemblyBase::checkChildrenState() {
	if (targetMode == MODE_OFF) {
		return checkChildrenStateOff();
	} else {
		return checkChildrenStateOn(targetMode, targetSubmode);
	}
}

ReturnValue_t AssemblyBase::checkChildrenStateOff() {
	for (std::map<object_id_t, ChildInfo>::iterator iter = childrenMap.begin();
			iter != childrenMap.end(); iter++) {
		if (checkChildOff(iter->first) != RETURN_OK) {
			return NOT_ENOUGH_CHILDREN_IN_CORRECT_STATE;
		}
	}
	return RETURN_OK;
}

ReturnValue_t AssemblyBase::checkChildOff(uint32_t objectId) {
	ChildInfo childInfo = childrenMap.find(objectId)->second;
	if (healthHelper.healthTable->isCommandable(objectId)) {
		if (childInfo.submode != SUBMODE_NONE) {
			return RETURN_FAILED;
		} else {
			if ((childInfo.mode != MODE_OFF)
					&& (childInfo.mode != DeviceHandlerIF::MODE_ERROR_ON)) {
				return RETURN_FAILED;
			}
		}
	}
	return RETURN_OK;
}

ReturnValue_t AssemblyBase::checkModeCommand(Mode_t mode, Submode_t submode,
		uint32_t* msToReachTheMode) {

//always accept transition to OFF
	if (mode == MODE_OFF) {
		if (submode != SUBMODE_NONE) {
			return INVALID_SUBMODE;
		}
		return RETURN_OK;
	}

	if ((mode != MODE_ON) && (mode != DeviceHandlerIF::MODE_NORMAL)) {
		return INVALID_MODE;
	}

	if (internalState != STATE_NONE) {
		return IN_TRANSITION;
	}

	return isModeCombinationValid(mode, submode);
}

ReturnValue_t AssemblyBase::handleHealthReply(CommandMessage* message) {
	if (message->getCommand() == HealthMessage::HEALTH_INFO) {
		HealthState health = HealthMessage::getHealth(message);
		if (health != EXTERNAL_CONTROL) {
			updateChildChangedHealth(message->getSender(), true);
		}
		return RETURN_OK;
	}
	if (message->getCommand() == HealthMessage::REPLY_HEALTH_SET
			|| (message->getCommand() == CommandMessage::REPLY_REJECTED
					&& message->getParameter2() == HealthMessage::HEALTH_SET)) {
		if (isInTransition()) {
			commandsOutstanding--;
		}
		return RETURN_OK;
	}
	return RETURN_FAILED;
}

bool AssemblyBase::checkAndHandleRecovery() {
	switch (recoveryState) {
	case RECOVERY_STARTED:
		recoveryState = RECOVERY_WAIT;
		recoveryOffTimer.resetTimer();
		return true;
	case RECOVERY_WAIT:
		if (recoveryOffTimer.isBusy()) {
			return true;
		}
		triggerEvent(RECOVERY_STEP, 0);
		sendHealthCommand(recoveringDevice->second.commandQueue, HEALTHY);
		internalState = STATE_NONE;
		recoveryState = RECOVERY_ONGOING;
		//Don't check state!
		return true;
	case RECOVERY_ONGOING:
		triggerEvent(RECOVERY_STEP, 1);
		recoveryState = RECOVERY_ONGOING_2;
		recoveringDevice->second.healthChanged = false;
		//Device should be healthy again, so restart a transition.
		//Might be including second step, but that's already handled.
		doStartTransition(targetMode, targetSubmode);
		return true;
	case RECOVERY_ONGOING_2:
		triggerEvent(RECOVERY_DONE);
		//Now we're through, but not sure if it was successful.
		recoveryState = RECOVERY_IDLE;
		return false;
	case RECOVERY_IDLE:
	default:
		return false;
	}
}

void AssemblyBase::overwriteDeviceHealth(object_id_t objectId,
		HasHealthIF::HealthState oldHealth) {
	triggerEvent(OVERWRITING_HEALTH, objectId, oldHealth);
	internalState = STATE_OVERWRITE_HEALTH;
	modeHelper.setForced(true);
	sendHealthCommand(childrenMap[objectId].commandQueue, EXTERNAL_CONTROL);
}