import QtQuick 2.0
import QtQuick.Window 2.0
import QtQuick.Layouts 1.0
import QtQuick.Controls 1.0
import QtQuick.Controls.Styles 1.1
import QtWebEngine 1.0
import QtWebEngine.experimental 1.0
import HttpServer 1.0
import "."

Item {
	id: webPreview
	property string pendingPageUrl: ""
	property bool initialized: false
	signal javaScriptMessage(var _level, string _sourceId, var _lineNb, string _content)

	function setPreviewUrl(url) {
		if (!initialized)
			pendingPageUrl = url;
		else {
			pendingPageUrl = "";
			updateContract();
			webView.runJavaScript("loadPage(\"" + url + "\")");
		}
	}

	function reload() {
		if (initialized) {
			updateContract();
			//webView.runJavaScript("reloadPage()");
			setPreviewUrl(urlInput.text);
		}
	}

	function updateContract() {
		var contracts = {};
		for (var c in codeModel.contracts) {
			var contract = codeModel.contracts[c];
			contracts[c] = {
				name: contract.contract.name,
				address: clientModel.contractAddresses[contract.contract.name],
				interface: JSON.parse(contract.contractInterface),
			};
		}
		webView.runJavaScript("updateContracts(" + JSON.stringify(contracts) + ")");
	}

	function reloadOnSave() {
		if (autoReloadOnSave.checked)
			reload();
	}

	function updateDocument(documentId, action) {
		for (var i = 0; i < pageListModel.count; i++)
			if (pageListModel.get(i).documentId === documentId)
				action(i);
	}

	function changePage() {
		setPreviewUrl(urlInput.text);
	}

	Connections {
		target: mainApplication
		onLoaded: {
			//We need to load the container using file scheme so that web security would allow loading local files in iframe
			var containerPage = fileIo.readFile("qrc:///qml/html/WebContainer.html");
			webView.loadHtml(containerPage, httpServer.url + "/WebContainer.html")

		}
	}

	Connections {
		target: clientModel
		onRunComplete: reload();
	}

	Connections {
		target: codeModel
		onContractInterfaceChanged: reload();
	}

	Connections {
		target: projectModel

		onDocumentAdded: {
			var document = projectModel.getDocument(documentId)
			if (document.isHtml)
				pageListModel.append(document);
		}
		onDocumentRemoved: {
			updateDocument(documentId, function(i) { pageListModel.remove(i) } )
		}

		onDocumentUpdated: {
			var document = projectModel.getDocument(documentId);
			for (var i = 0; i < pageListModel.count; i++)
				if (pageListModel.get(i).documentId === documentId)
				{
					pageListModel.set(i, document);
					break;
				}
		}

		onProjectLoading: {
			for (var i = 0; i < target.listModel.count; i++) {
				var document = target.listModel.get(i);
				if (document.isHtml) {
					pageListModel.append(document);
					if (pageListModel.count === 1) //first page added
					{
						urlInput.text = httpServer.url + "/" + document.documentId;
						setPreviewUrl(httpServer.url + "/" + document.documentId);
					}
				}
			}
		}

		onDocumentSaved:
		{
			if (!projectModel.getDocument(documentId).isContract)
				reloadOnSave();
		}

		onProjectClosed: {
			pageListModel.clear();
		}
	}

	ListModel {
		id: pageListModel
	}

	HttpServer {
		id: httpServer
		listen: true
		accept: true
		port: 8893
		onClientConnected: {
			var urlPath = _request.url.toString();
			if (urlPath.indexOf("/rpc/") === 0)
			{
				//jsonrpc request
				//filter polling requests //TODO: do it properly
				var log = _request.content.indexOf("eth_changed") < 0;
				if (log)
					console.log(_request.content);
				var response = clientModel.apiCall(_request.content);
				if (log)
					console.log(response);
				_request.setResponse(response);
			}
			else
			{
				//document request
				if (urlPath === "/")
					urlPath = "/index.html";
				var documentId = urlPath.substr(urlPath.lastIndexOf("/") + 1);
				var content = "";
				if (projectModel.codeEditor.isDocumentOpen(documentId))
					content = projectModel.codeEditor.getDocumentText(documentId);
				else
				{
					var doc = projectModel.getDocument(documentId);
					if (doc !== undefined)
						content = fileIo.readFile(doc.path);
				}

				if (documentId === urlInput.text.replace(httpServer.url + "/", "")) {
					//root page, inject deployment script
					content = "<script>web3=parent.web3;contracts=parent.contracts;</script>\n" + content;
					_request.setResponseContentType("text/html");
				}
				_request.setResponse(content);
			}
		}
	}

	ColumnLayout {
		anchors.fill: parent
		spacing: 0
		Rectangle
		{
			anchors.leftMargin: 4
			color: WebPreviewStyle.general.headerBackgroundColor
			Layout.preferredWidth: parent.width
			Layout.preferredHeight: 32
			Row {
				anchors.top: parent.top
				anchors.fill: parent
				anchors.leftMargin: 3
				spacing: 3

				DefaultTextField
				{
					id: urlInput
					anchors.verticalCenter: parent.verticalCenter
					height: 21
					width: 300
					Keys.onEnterPressed:
					{
						setPreviewUrl(text);
					}
					Keys.onReturnPressed:
					{
						setPreviewUrl(text);
					}
					focus: true
				}

				Action {
					tooltip: qsTr("Reload")
					id: buttonReloadAction
					onTriggered: {
						reload();
					}
				}

				Button {
					iconSource: "qrc:/qml/img/available_updates.png"
					action: buttonReloadAction
					anchors.verticalCenter: parent.verticalCenter
					width: 21
					height: 21
					focus: true
				}

				Rectangle
				{
					width: 1
					height: parent.height - 10
					color: WebPreviewStyle.general.separatorColor
					anchors.verticalCenter: parent.verticalCenter
				}

				CheckBox {
					id: autoReloadOnSave
					checked: true
					height: 21
					anchors.verticalCenter: parent.verticalCenter
					style: CheckBoxStyle {
						label: DefaultLabel {
							text: qsTr("Auto reload on save")
						}
					}
					focus: true
				}

				Rectangle
				{
					width: 1
					height: parent.height - 10
					color: WebPreviewStyle.general.separatorColor
					anchors.verticalCenter: parent.verticalCenter
				}

				Button
				{
					height: 28
					anchors.verticalCenter: parent.verticalCenter
					action: expressionAction
					iconSource: "qrc:/qml/img/console.png"
				}

				Action {
					id: expressionAction
					tooltip: qsTr("Expressions")
					onTriggered:
					{
						expressionPanel.visible = !expressionPanel.visible;
						if (expressionPanel.visible)
						{
							webView.width = webView.parent.width - 350
							expressionInput.forceActiveFocus();
						}
						else
							webView.width = webView.parent.width
					}
				}
			}
		}

		Rectangle
		{
			Layout.preferredHeight: 1
			Layout.preferredWidth: parent.width
			color: WebPreviewStyle.general.separatorColor
		}

		Splitter
		{
			Layout.preferredWidth: parent.width
			Layout.fillHeight: true
			WebEngineView {
				Layout.fillHeight: true
				width: parent.width
				Layout.preferredWidth: parent.width
				id: webView
				experimental.settings.localContentCanAccessRemoteUrls: true
				onJavaScriptConsoleMessage: {
					webPreview.javaScriptMessage(level, sourceID, lineNumber, message);
				}
				onLoadingChanged: {
					if (!loading) {
						initialized = true;
						webView.runJavaScript("init(\"" + httpServer.url + "/rpc/\")");
						if (pendingPageUrl)
							setPreviewUrl(pendingPageUrl);
					}
				}
			}

			Column {
				id: expressionPanel
				width: 350
				Layout.preferredWidth: 350
				Layout.fillHeight: true
				spacing: 0
				visible: false
				function addExpression()
				{
					if (expressionInput.text === "")
						return;
					expressionInput.history.unshift(expressionInput.text);
					expressionInput.index = -1;
					webView.runJavaScript("executeJavaScript(\"" + expressionInput.text.replace(/"/g, '\\"') + "\")", function(result) {
						resultTextArea.text = "> " + result + "\n\n" + resultTextArea.text;
						expressionInput.text = "";
					});
				}

				Row
				{
					id: rowConsole
					width: parent.width
					Button
					{
						height: 22
						width: 22
						action: clearAction
						iconSource: "qrc:/qml/img/broom.png"
					}

					Action {
						id: clearAction
						enabled: resultTextArea.text !== ""
						tooltip: qsTr("Clear")
						onTriggered: {
							resultTextArea.text = "";
						}
					}

					DefaultTextField {
						id: expressionInput
						width: parent.width - 15
						height: 20
						font.family: WebPreviewStyle.general.fontName
						font.italic: true
						font.pointSize: Style.absoluteSize(-3)
						anchors.verticalCenter: parent.verticalCenter

						property var history: []
						property int index: -1

						function displayCache(incr)
						{
							index = index + incr;
							if (history.length - 1 < index || index < 0)
							{
								if (incr === 1)
									index = 0;
								else
									index = history.length - 1;
							}
							expressionInput.text = history[index];
						}

						Keys.onDownPressed: {
							displayCache(1);
						}

						Keys.onUpPressed: {
							displayCache(-1);
						}

						Keys.onEnterPressed:
						{
							expressionPanel.addExpression();
						}

						Keys.onReturnPressed:
						{
							expressionPanel.addExpression();
						}

						onFocusChanged:
						{
							if (!focus && text == "")
								text = qsTr("Expression");
							if (focus && text === qsTr("Expression"))
								text = "";
						}

						style: TextFieldStyle {
							background: Rectangle {
								color: "transparent"
							}
						}
					}
				}

				TextArea {
					Layout.fillHeight: true
					height: parent.height - rowConsole.height
					readOnly: true
					id: resultTextArea
					width: expressionPanel.width
					wrapMode: Text.Wrap
					font.family: WebPreviewStyle.general.fontName
					font.pointSize: Style.absoluteSize(-3)
					backgroundVisible: true
					style: TextAreaStyle {
						backgroundColor: "#f0f0f0"
					}
				}
			}
		}
	}
}