State of all lights is saved and restored on switchOff().

Former-commit-id: 1ee26e8c01d90456424c1b5ea3f113dfd0ff6525

libsrc/leddevice/LedDevicePhilipsHue.cpp

@@ -1,16 +1,18 @@
 // Local-Hyperion includes
 #include "LedDevicePhilipsHue.h"
 
-#include <iostream>
+// jsoncpp includes
+#include <json/json.h>
 
+// qt includes
 #include <QtCore/qmath.h>
 #include <QUrl>
 #include <QHttpRequestHeader>
-#include <QThread>
+#include <QEventLoop>
 
 LedDevicePhilipsHue::LedDevicePhilipsHue(const std::string& output) :
-	host(output.c_str()), username("newdeveloper") {
-	http = new QHttp(host, 80);
+		host(output.c_str()), username("newdeveloper") {
+	http = new QHttp(host);
 }
 
 LedDevicePhilipsHue::~LedDevicePhilipsHue() {
@@ -18,15 +20,20 @@ LedDevicePhilipsHue::~LedDevicePhilipsHue() {
 }
 
 int LedDevicePhilipsHue::write(const std::vector<ColorRgb> & ledValues) {
+	// Save light states if not done before.
+	if (!statesSaved()) {
+		saveStates(ledValues.size());
+	}
+	// Iterate through colors and set light states.
 	unsigned int lightId = 1;
 	for (const ColorRgb& color : ledValues) {
 		float x, y, b;
 		// Scale colors from [0, 255] to [0, 1] and convert to xy space.
 		rgbToXYBrightness(color.red / 255.0f, color.green / 255.0f, color.blue / 255.0f, x, y, b);
 		// Send adjust color command in JSON format.
-		put(getRoute(lightId), QString("{\"xy\": [%1, %2]}").arg(x).arg(y));
+		put(getStateRoute(lightId), QString("{\"xy\": [%1, %2]}").arg(x).arg(y));
 		// Send brightness color command in JSON format.
-		put(getRoute(lightId), QString("{\"bri\": %1}").arg(qRound(b * 255.0f)));
+		put(getStateRoute(lightId), QString("{\"bri\": %1}").arg(qRound(b * 255.0f)));
 		// Next light id.
 		lightId++;
 	}
@@ -34,6 +41,11 @@ int LedDevicePhilipsHue::write(const std::vector<ColorRgb> & ledValues) {
 }
 
 int LedDevicePhilipsHue::switchOff() {
+	// If light states have been saved before, ...
+	if (statesSaved()) {
+		// ... restore them.
+		restoreStates();
+	}
 	return 0;
 }
 
@@ -47,15 +59,68 @@ void LedDevicePhilipsHue::put(QString route, QString content) {
 	http->request(header, content.toAscii());
 }
 
-QString LedDevicePhilipsHue::getRoute(unsigned int lightId) {
+QByteArray LedDevicePhilipsHue::get(QString route) {
+	QString url = QString("/api/%1/%2").arg(username).arg(route);
+	// Event loop to block until request finished.
+	QEventLoop loop;
+	// Connect requestFinished signal to quit slot of the loop.
+	loop.connect(http, SIGNAL(requestFinished(int, bool)), SLOT(quit()));
+	// Perfrom request
+	http->get(url);
+	// Go into the loop until the request is finished.
+	loop.exec();
+	// Read all data of the response.
+	return http->readAll();
+}
+
+QString LedDevicePhilipsHue::getStateRoute(unsigned int lightId) {
 	return QString("lights/%1/state").arg(lightId);
 }
 
+QString LedDevicePhilipsHue::getRoute(unsigned int lightId) {
+	return QString("lights/%1").arg(lightId);
+}
+
+void LedDevicePhilipsHue::saveStates(unsigned int nLights) {
+	// Clear saved light states.
+	states.clear();
+	// Use json parser to parse reponse.
+	Json::Reader reader;
+	Json::FastWriter writer;
+	// Iterate lights.
+	for (unsigned int i = 0; i < nLights; i++) {
+		// Read the response.
+		QByteArray response = get(getRoute(i + 1));
+		// Parse JSON.
+		Json::Value state;
+		if (!reader.parse(QString(response).toStdString(), state)) {
+			// Error occured, break loop.
+			break;
+		}
+		// Save state object.
+		states.push_back(QString(writer.write(state["state"]).c_str()));
+	}
+}
+
+void LedDevicePhilipsHue::restoreStates() {
+	unsigned int lightId = 1;
+	for (QString state : states) {
+		put(getStateRoute(lightId), state);
+		lightId++;
+	}
+	// Clear saved light states.
+	states.clear();
+}
+
+bool LedDevicePhilipsHue::statesSaved() {
+	return !states.empty();
+}
+
 void LedDevicePhilipsHue::rgbToXYBrightness(float red, float green, float blue, float& x, float& y, float& brightness) {
 	// Apply gamma correction.
 	red = (red > 0.04045f) ? qPow((red + 0.055f) / (1.0f + 0.055f), 2.4f) : (red / 12.92f);
-	green = (green > 0.04045f) ? qPow ((green + 0.055f) / (1.0f + 0.055f), 2.4f) : (green / 12.92f);
-	blue = (blue > 0.04045f) ? qPow ((blue + 0.055f) / (1.0f + 0.055f), 2.4f) : (blue / 12.92f);
+	green = (green > 0.04045f) ? qPow((green + 0.055f) / (1.0f + 0.055f), 2.4f) : (green / 12.92f);
+	blue = (blue > 0.04045f) ? qPow((blue + 0.055f) / (1.0f + 0.055f), 2.4f) : (blue / 12.92f);
 	// Convert to XYZ space.
 	float X = red * 0.649926f + green * 0.103455f + blue * 0.197109f;
 	float Y = red * 0.234327f + green * 0.743075f + blue * 0.022598f;