#include <iostream>
#include <fstream>
#include <stdexcept>
#include <string>
#include <vector>
#include <sstream>
#include <memory>
#include <opts.h>
#include <asynchronousContinuation.h>
#include <callback.h>
#include <deviceManager/deviceManager.h>
#include <senseApis/senseApiManager.h>
#include <marionette/marionette.h>

namespace smo {
namespace device {

std::vector<std::shared_ptr<InteroceptorDevAttachmentSpec>>
    DeviceManager::interoceptorDeviceSpecs;
std::vector<std::shared_ptr<ExtrospectorDevAttachmentSpec>>
    DeviceManager::extrospectorDeviceSpecs;
std::vector<std::shared_ptr<DeviceAttachmentSpec>>
    DeviceManager::deviceAttachmentSpecs;
std::vector<std::shared_ptr<Device>>
    DeviceManager::devices;

const std::string DeviceManager::stringifyDeviceSpecs(void)
{
	std::ostringstream oss;

	for (const auto& spec : DeviceManager::interoceptorDeviceSpecs) {
		oss << "Interoceptor " << spec->stringify();
	}

	for (const auto& spec : DeviceManager::extrospectorDeviceSpecs) {
		oss << "Extrospector " << spec->stringify();
	}

	return oss.str();
}

class DeviceManager::NewDeviceAttachmentSpecInd
:	public PostedAsynchronousContinuation<newDeviceAttachmentSpecIndCbFn>
{
public:
	NewDeviceAttachmentSpecInd(
		std::shared_ptr<DeviceAttachmentSpec> s,
		const std::shared_ptr<ComponentThread> &caller,
		Callback<newDeviceAttachmentSpecIndCbFn> cb)
	:	PostedAsynchronousContinuation<newDeviceAttachmentSpecIndCbFn>(
			caller, cb),
	spec(s)
	{}

public:
	std::shared_ptr<DeviceAttachmentSpec> spec;

public:
	void newDeviceAttachmentSpecInd1_posted(
		[[maybe_unused]] std::shared_ptr<NewDeviceAttachmentSpecInd> context
		)
	{
		sense_api::SenseApiManager::getInstance().attachSenseDeviceReq(
			spec,
			{context, std::bind(
				&NewDeviceAttachmentSpecInd::newDeviceAttachmentSpecInd2,
				context.get(), context,
				std::placeholders::_1, std::placeholders::_2)});
	}

	void newDeviceAttachmentSpecInd2(
		[[maybe_unused]] std::shared_ptr<NewDeviceAttachmentSpecInd> context,
		bool success,
		std::shared_ptr<DeviceAttachmentSpec> deviceSpec
		)
	{
		if (!success)
		{
			std::cerr << __func__ << ": Attach failed for device spec "
				<< deviceSpec->stringify() << std::endl;
			callOriginalCb(false, nullptr, deviceSpec);
			return;
		}

		try {
			/**	EXPLANATION:
			 * Remember that deviceAttachmentSpecs don't refer to devices, but
			 * rather to roles that a device can enact when attached to in the
			 * described manner. Therefore, it's possible for multiple DA specs
			 * to refer to the same device.
			 *
			 * That's why we need to ensure that the device doesn't already
			 * exist before trying to create a new device for it.
			 */
			std::shared_ptr<Device> device = nullptr;
			for (const auto& existingDevice : devices)
			{
				if (existingDevice->deviceIdentifier != spec->deviceIdentifier)
					{ continue; }

				device = existingDevice;
				break;
			}

			// If device doesn't exist, create a new one and add it
			if (!device)
			{
				device = std::make_shared<Device>(spec->deviceIdentifier);
				devices.push_back(device);
			}

			// Add DeviceAttachmentSpec to device's list
			device->deviceAttachmentSpecs.push_back(spec);

			// Add DeviceAttachmentSpec to DeviceManager's list
			deviceAttachmentSpecs.push_back(spec);

			// Callback with success
			callOriginalCb(true, device, spec);
		} catch (const std::exception& e) {
			// Attach failed, callback with error
			callOriginalCb(false, nullptr, spec);
		}
	}
};

void DeviceManager::newDeviceAttachmentSpecInd(
	std::shared_ptr<DeviceAttachmentSpec> spec,
	Callback<newDeviceAttachmentSpecIndCbFn> callback)
{
	// Check if a DeviceAttachmentSpec already matches
	for (const auto& existingSpec : deviceAttachmentSpecs)
	{
		if (!(*existingSpec == *spec)) { continue; }
		// Already exists, callback with error
		callback.callbackFn(false, nullptr, spec);
		return;
	}

	// Create async continuation
	const auto& caller = ComponentThread::getSelf();
	auto continuation = std::make_shared<NewDeviceAttachmentSpecInd>(
		spec, caller, callback);

	mrntt::mrntt.thread->getIoService().post(
		std::bind(
			&NewDeviceAttachmentSpecInd::newDeviceAttachmentSpecInd1_posted,
			continuation.get(), continuation));
}

} // namespace device
} // namespace smo