
from qgis.PyQt.QtWidgets import QDialog,QLabel,QComboBox,QPushButton,QAction,QMessageBox,QCompleter,QPlainTextEdit,QLineEdit
from qgis.PyQt.QtCore import QUrl
from qgis.PyQt import QtCore
from qgis.PyQt.QtNetwork import QNetworkAccessManager,QNetworkRequest,QNetworkReply
from qgis.core import QgsVectorLayer,QgsRasterLayer,QgsProject,QgsGeometry,QgsFeature, QgsCoordinateReferenceSystem, QgsCoordinateTransform, QgsWkbTypes,QgsMapLayer,QgsPointXY
from qgis.gui import QgsMapCanvas,QgsMapToolPan,QgsProjectionSelectionWidget
from qgis.PyQt import uic
from .rectanglemaptool import RectangleMapTool
import os.path
import json

FORM_CLASS, _ = uic.loadUiType(os.path.join(
    os.path.dirname(__file__), 'bboxdialog.ui'))

class SPARQLCompleter(QCompleter):
    insertText = QtCore.pyqtSignal(str)

    def __init__(self,autocomplete, parent=None):
        QCompleter.__init__(self, autocomplete, parent)
        self.setCompletionMode(QCompleter.PopupCompletion)
        #self.setFilterMode(Qt.MatchContains)
        #self.highlighted.connect(self.setHighlighted)

    def setHighlighted(self, text):
        self.lastSelected = text

    def getSelected(self):
        return self.lastSelected
    
class NominatimText(QLineEdit):

    def __init__(self,parent,nominatimmap,map_canvas):
        super(self.__class__, self).__init__(parent)
        self.nominatimmap=nominatimmap
        self.map_canvas=map_canvas
        
    def insertCompletion(self, completion):
        self.map_canvas.zoomWithCenter(self.nominatimmap[completion][0],self.nominatimmap[completion][1],True)

    def setMap(self, nominatimmap):
        self.nominatimmap=nominatimmap

class BBOXDialog(QDialog,FORM_CLASS):
	
    def __init__(self,inp_sparql,triplestoreconf,endpointIndex):
        super(QDialog, self).__init__()
        self.setupUi(self)
        self.inp_sparql=inp_sparql
        self.triplestoreconf=triplestoreconf
        self.endpointIndex=endpointIndex
        self.vl = QgsVectorLayer("Point", "temporary_points", "memory")
        self.map_canvas = QgsMapCanvas(self)
        self.layerExtentOrBBOX=False
        self.map_canvas.setMinimumSize(500, 475)
        self.map_canvas.move(0,30)	
        self.nominatimmap={}
        actionPan = QAction("Pan", self)
        actionPan.setCheckable(True)
        actionPan.triggered.connect(self.pan)
        self.toolPan = QgsMapToolPan(self.map_canvas)
        self.toolPan.setAction(actionPan)
        uri="url=http://a.tile.openstreetmap.org/{z}/{x}/{y}.png&zmin=0&type=xyz"
        self.mts_layer=QgsRasterLayer(uri,'OSM','wms')
        if not self.mts_layer.isValid():
            print ("Layer failed to load!")
        self.rect_tool = RectangleMapTool(self.map_canvas)
        self.map_canvas.setMapTool(self.rect_tool)
        self.map_canvas.setExtent(self.mts_layer.extent())
        self.map_canvas.setLayers( [self.vl,self.mts_layer] )
        self.map_canvas.setCurrentLayer(self.mts_layer)
        self.pan()
        self.geocodeSearch=NominatimText(self,self.nominatimmap,self.map_canvas)
        self.move(120,0)
        self.crsdialog=QgsProjectionSelectionWidget(self)
        self.crsdialog.move(160,540)	
        self.crsdialog.resize(331, 30)
        self.crsdialog.setCrs(QgsCoordinateReferenceSystem('EPSG:4326'))
        self.crsdialog.show()
        self.nominatimurl='https://nominatim.openstreetmap.org/search?format=json&q={address}'
        self.panButton.clicked.connect(self.pan)
        self.selectButton.clicked.connect(self.selectarea)
        self.zoomIn.clicked.connect(self.map_canvas.zoomIn)
        self.zoomOut.clicked.connect(self.map_canvas.zoomOut)
        self.b2.clicked.connect(self.setBBOXExtentQuery)	
        self.searchButton.hide()
        self.searchPlace.hide()
        self.geocodeSearch.hide()
        layers = QgsProject.instance().layerTreeRoot().children()	
        for layer in layers:	
            self.chooseBBOXLayer.addItem(layer.name())  	
        self.searchButton.clicked.connect(self.geocode)
        self.b1.clicked.connect(self.setBBOXInQuery)

    def geocode(self):
        try: 
            nominatimurl = self.nominatimurl.format(**{'address': self.geocodeSearch.text()})
            self.networkrequest(nominatimurl)
        except Exception as e:
            msgBox=QMessageBox()
            msgBox.setWindowTitle("Mandatory variables missing!")
            msgBox.setText(str(e))
            msgBox.exec()

    def networkrequest(self,nurl):
        global reply
        self.manager = QNetworkAccessManager()
        url = QUrl(nurl)
        request = QNetworkRequest(url)
        self.manager.finished.connect(self.handleResponse)
        self.manager.get(request)
        
    def handleResponse(self, reply):
        er = reply.error()
        if er == QNetworkReply.NoError:
            bytes_string = reply.readAll()
            print(str(bytes_string, 'utf-8'))
            results = json.loads(str(bytes_string, 'utf-8'))
            self.nominatimmap={}
            chooselist=[]
            for rec in results:
                chooselist.append(rec['display_name'])
                self.nominatimmap[rec['display_name']]=[rec['lon'],rec['lat']]
            completer = SPARQLCompleter(chooselist)
            self.geocodeSearch.setMap(self.nominatimmap)
            self.geocodeSearch.setCompleter(completer)
            #self.geocodeSearch.insertCompletion.connect(self.zoomToCoordinates)
            completer.popup().show()
        else:
            print("Error occured: ", er)

    def zoomToCoordinates(self,completion):
        msgBox=QMessageBox()
        msgBox.setText(completion)
        msgBox.exec()
        self.map_canvas.zoomWithCenter(self.nominatimmap[completion][0],self.nominatimmap[completion][1],True)
	
    def pan(self):
        self.map_canvas.setMapTool(self.toolPan)

    def selectarea(self):
        self.map_canvas.setMapTool(self.rect_tool)
        
    def setBBOXExtentQuery(self):
        if len(QgsProject.instance().layerTreeRoot().children())>0:
            self.mts_layer=QgsProject.instance().layerTreeRoot().children()[self.chooseBBOXLayer.currentIndex()].layer()	
            self.layerExtentOrBBOX=True	
            self.setBBOXInQuery()
        else:
            msgBox=QMessageBox()
            msgBox.setWindowTitle("No layer loaded in QGIS!")
            msgBox.setText("No layer has been loaded in QGIS to get an extent from!")
            msgBox.exec()
	
    def setBBOXInQuery(self):
        sourceCrs=None
        if self.layerExtentOrBBOX:
            xMax=self.mts_layer.extent().xMaximum()
            xMin=self.mts_layer.extent().xMinimum()
            yMin=self.mts_layer.extent().yMinimum()
            yMax=self.mts_layer.extent().yMaximum()
            pointt1=QgsGeometry.fromPointXY(QgsPointXY(xMax,yMin))	
            pointt2=QgsGeometry.fromPointXY(QgsPointXY(xMin,yMin))	
            pointt3=QgsGeometry.fromPointXY(QgsPointXY(xMin,yMax))	
            pointt4=QgsGeometry.fromPointXY(QgsPointXY(xMax,yMax))
            sourceCrs = QgsCoordinateReferenceSystem(self.mts_layer.crs())	
        else:	
            pointt1=QgsGeometry.fromWkt(self.rect_tool.point1.asWkt())	
            pointt2=QgsGeometry.fromWkt(self.rect_tool.point2.asWkt())	
            pointt3=QgsGeometry.fromWkt(self.rect_tool.point3.asWkt())	
            pointt4=QgsGeometry.fromWkt(self.rect_tool.point4.asWkt())	
            sourceCrs = QgsCoordinateReferenceSystem(self.mts_layer.crs())
        if sourceCrs!=None:
            destCrs = self.crsdialog.crs()
            tr = QgsCoordinateTransform(sourceCrs, destCrs, QgsProject.instance())
            pointt1.transform(tr)
            pointt2.transform(tr)
            pointt3.transform(tr)
            pointt4.transform(tr)
        polygon = QgsGeometry.fromPolylineXY( [pointt1.asPoint(),pointt2.asPoint(),pointt3.asPoint(),pointt4.asPoint()] )
        center=polygon.centroid()
        #distance = QgsDistanceArea()
        #distance.setSourceCrs(destCrs)
        #distance.setEllipsoidalMode(True)
        #distance.setEllipsoid('WGS84')
        widthm = 100 #distance.measureLine(pointt1, pointt2)
        self.curbbox=[]
        self.curbbox.append(pointt1)
        self.curbbox.append(pointt2)
        self.curbbox.append(pointt3)
        self.curbbox.append(pointt4)
        self.close()
        curquery=self.inp_sparql.toPlainText()
        if "bboxquery" in self.triplestoreconf[self.endpointIndex] and self.triplestoreconf[self.endpointIndex]["bboxquery"]["type"]=="geosparql":
             curquery=curquery[0:curquery.rfind('}')]+self.triplestoreconf[self.endpointIndex]["bboxquery"]["query"].replace("%%x1%%",str(pointt1.asPoint().x())).replace("%%x2%%",str(pointt3.asPoint().x())).replace("%%y1%%",str(pointt1.asPoint().y())).replace("%%y2%%",str(pointt3.asPoint().y()))+"}\n"+curquery[curquery.rfind('}')+1:]
        elif "bboxquery" in self.triplestoreconf[self.endpointIndex] and self.triplestoreconf[self.endpointIndex]["bboxquery"]["type"]=="minmax":
             curquery=curquery[0:curquery.rfind('}')]+self.triplestoreconf[self.endpointIndex]["bboxquery"]["query"].replace("%%minPoint%%",pointt2.asWkt()).replace("%%maxPoint%%",pointt4.asWkt())+curquery[curquery.rfind('}')+1:]
        elif "bboxquery" in self.triplestoreconf[self.endpointIndex] and self.triplestoreconf[self.endpointIndex]["bboxquery"]["type"]=="pointdistance":
            curquery=curquery[0:curquery.rfind('}')]+self.triplestoreconf[self.endpointIndex]["bboxquery"]["query"].replace("%%lat%%",str(center.asPoint().y())).replace("%%lon%%",str(center.asPoint().x())).replace("%%distance%%",str(widthm/1000))+curquery[curquery.rfind('}')+1:]
        self.inp_sparql.setPlainText(curquery)
