# -*- coding: utf-8 -*-
"""
/***************************************************************************
 DsgTools
                                 A QGIS plugin
 Brazilian Army Cartographic Production Tools
                             -------------------
        begin                : 2023-05-17
        git sha              : $Format:%H$
        copyright            : (C) 2023 by Philipe Borba - Cartographic Engineer @ Brazilian Army
                                   2023 by Pedro Martins - Cartographic Engineer @ Brazilian Army
        email                : borba.philipe@eb.mil.br
                               pedromartins.souza@eb.mil.br
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
"""


from qgis.PyQt.QtWidgets import QToolTip
from DsgTools.gui.ProductionTools.MapTools.FreeHandTool.models.acquisitionFree import (
    AcquisitionFree,
)
from qgis.core import (
    QgsCoordinateTransformContext,
    QgsDistanceArea,
    QgsGeometry,
    QgsProject,
    QgsUnitTypes,
    QgsVectorLayer,
    QgsWkbTypes,
)
from qgis.gui import QgisInterface, QgsMapToolDigitizeFeature
from qgis.PyQt.QtCore import QEvent, QObject, QRect, Qt
from qgis.PyQt.QtWidgets import QPushButton


class MeasureTool(QObject):
    def __init__(self, iface: QgisInterface):
        """
        Hides or show active layers labels.
        """
        self.iface = iface
        self.canvas = self.iface.mapCanvas()
        super(MeasureTool, self).__init__()
        self.toolAction = None
        self.distance_area = QgsDistanceArea()
        self.acquisitionTooltipButton = QPushButton()
        self.acquisitionTooltipButton.setToolTip(self.tr("Show acquisition tooltip"))
        self.pointList = PointList()
        self.eventFilter = None
        self.isFreeHand = False

    def addTool(self, manager, callback, parentToolbar, stackButton, iconBasePath):
        self.stackButton = stackButton
        icon_path = iconBasePath + "/measure_tool.png"
        toolTip = self.tr("DSGTools: Measure while digitizing")
        action = manager.add_action(
            icon_path,
            text=self.tr("DSGTools: Measure while digitizing"),
            callback=self.activateTool,
            add_to_menu=False,
            add_to_toolbar=True,
            withShortcut=True,
            tooltip=toolTip,
            parentButton=stackButton,
            isCheckable=True,
        )
        self.setAction(action)

    def activateTool(self):
        state = self.toolAction.isChecked()
        if state:
            self.canvas.mapToolSet.connect(self.activateFilterMapTool)
            if not isinstance(self.canvas.mapTool(), QgsMapToolDigitizeFeature):
                return
        else:
            try:
                self.canvas.mapToolSet.disconnect(self.activateFilterMapTool)
            except TypeError:
                pass
        self.activateFilter(state)

    def activateFilterMapTool(self, mapTool):
        state = isinstance(mapTool, QgsMapToolDigitizeFeature)
        self.isFreeHand = isinstance(mapTool, AcquisitionFree)
        self.activateFilter(state)

    def setToolEnabled(self):
        layer = self.iface.activeLayer()
        if (
            not isinstance(layer, QgsVectorLayer)
            or layer.geometryType() == QgsWkbTypes.GeometryType.PointGeometry
            or not layer.isEditable()
        ):
            enabled = False
        else:
            enabled = True
        if not enabled:
            self.closeAndRemoveEventFilter()
        self.toolAction.setEnabled(enabled)
        return enabled

    def activateFilter(self, state: bool):
        if self.isFreeHand:
            return
        elif state:
            self.eventFilter = EventFilter(self.iface, self.pointList)
            self.canvas.viewport().setMouseTracking(True)
            self.canvas.viewport().installEventFilter(self.eventFilter)
            self.canvas.installEventFilter(self.eventFilter)
        else:
            self.closeAndRemoveEventFilter()

    def setAction(self, action):
        self.toolAction = action
        self.toolAction.setCheckable(True)
        self.setToolEnabled()

    def closeAndRemoveEventFilter(self):
        self.toolAction.setChecked(False)
        if self.eventFilter is None:
            return
        self.eventFilter.close()
        self.canvas.viewport().removeEventFilter(self.eventFilter)
        self.canvas.removeEventFilter(self.eventFilter)
        self.eventFilter = None
        try:
            self.canvas.mapToolSet.disconnect(self.activateFilterMapTool)
        except TypeError:
            pass

    def unload(self):
        self.closeAndRemoveEventFilter()


class PointList(list):
    def __init__(self):
        list.__init__(self)

    def empty(self):
        self[:] = []

    def newPoint(self):
        if len(self) > 0:
            self.insert(0, self[0])

    def updateCurrentPoint(self, point):
        if len(self) > 0:
            self[0] = point
        else:
            self.insert(0, point)

    def previousPoint(self):
        if len(self) > 1:
            return self[1]
        else:
            return None

    def removeLastPoint(self):
        if len(self) > 1:
            del self[1]


class EventFilter(QObject):
    def __init__(self, iface: QgisInterface, pointList: PointList):
        QObject.__init__(self)
        self.iface = iface
        self.mapCanvas = iface.mapCanvas()
        self.pointList = pointList
        self.dist_area = QgsDistanceArea()
        self.updateDistArea()
        QgsProject.instance().crsChanged.connect(self.updateDistArea)

    def close(self):
        QgsProject.instance().crsChanged.disconnect(self.updateDistArea)

    def updateDistArea(self):
        projCrs = QgsProject.instance().crs()
        self.dist_area.setSourceCrs(projCrs, QgsCoordinateTransformContext())
        ellipsoidAcronym = projCrs.ellipsoidAcronym()
        if ellipsoidAcronym != "":
            self.dist_area.setEllipsoid(ellipsoidAcronym)

    def eventFilter(self, obj, event):
        if not event.spontaneous():
            return QObject.eventFilter(self, obj, event)
        if (
            (
                event.type() == QEvent.Type.MouseButtonPress
                and event.button() == Qt.MouseButton.LeftButton
            )
            or (
                event.type() == QEvent.Type.MouseButtonRelease
                and event.button() == Qt.MouseButton.LeftButton
            )
            or (
                event.type() == QEvent.Type.MouseMove
                and event.button() != Qt.MouseButton.MiddleButton
            )
        ):
            curPoint = (
                self.iface.mapCanvas()
                .getCoordinateTransform()
                .toMapCoordinates(event.pos())
            )
            self.updateMeasure()
            self.pointList.updateCurrentPoint(curPoint)
        if (
            event.type() == QEvent.Type.MouseButtonRelease
            and event.button() == Qt.MouseButton.LeftButton
        ):
            self.pointList.newPoint()
        elif event.type() == QEvent.Type.KeyPress:
            if event.key() == Qt.Key.Key_Backspace or event.key() == Qt.Key.Key_Delete:
                self.pointList.removeLastPoint()
            elif event.key() == Qt.Key.Key_Escape:
                self.pointList.empty()
        elif (
            event.type() == QEvent.Type.MouseButtonRelease
            and event.button() == Qt.MouseButton.RightButton
        ):
            self.pointList.empty()
        return QObject.eventFilter(self, obj, event)

    def updateMeasure(self):
        length, distAcum = None, None
        area = None
        if (
            self.iface.mapCanvas().currentLayer().geometryType()
            == QgsWkbTypes.GeometryType.LineGeometry
        ):
            if len(self.pointList) > 1:
                line_dist = QgsGeometry.fromPolylineXY(self.pointList[:2])
                length = line_dist.length()
            line_acum = QgsGeometry.fromPolylineXY(self.pointList)
            measure_distAcum = self.dist_area.measureLength(line_acum)
            distAcum = self.dist_area.convertLengthMeasurement(
                measure_distAcum, QgsUnitTypes.DistanceMeters
            )
            tooltip = QToolTip
            if length != None or length == 0:
                measure_dist = self.dist_area.measureLength(line_dist)
                dist = self.dist_area.convertLengthMeasurement(
                    measure_dist, QgsUnitTypes.DistanceMeters
                )
                txt = f"<b>Parcial: {dist:.3f} m</b><br/><b>Total: {distAcum:.3f} m</b></p>"
                tooltip.showText(
                    self.mapCanvas.mapToGlobal(self.mapCanvas.mouseLastXY()),
                    txt,
                    self.mapCanvas,
                    QRect(),
                    5000,
                )
            else:
                tooltip.hideText()
        elif (
            self.iface.mapCanvas().currentLayer().geometryType()
            == QgsWkbTypes.GeometryType.PolygonGeometry
        ):
            tempPointList = []
            if len(self.pointList) > 2:
                tempPointList = self.pointList[:]
                tempPointList.append(self.pointList[0])
                polygon = QgsGeometry.fromPolygonXY([tempPointList])
                area = polygon.area()
            if area != None:
                measure_area = self.dist_area.measureArea(polygon)
                area = self.dist_area.convertAreaMeasurement(
                    measure_area, QgsUnitTypes.AreaSquareMeters
                )
                txt = f"<b>Area: {area:.3f}m²</b></p>"
                QToolTip.showText(
                    self.mapCanvas.mapToGlobal(self.mapCanvas.mouseLastXY()),
                    txt,
                    self.mapCanvas,
                )
            else:
                QToolTip.hideText()
