# -*- coding: utf-8 -*-
"""
/***************************************************************************
 drag_box_tool
        A class for dragging a box on the map
 FSC QGIS plugin for biological recorders
                              -------------------
        begin                : 2014-02-17
        copyright            : (C) 2014 by Rich Burkmar, Field Studies Council
        email                : richardb@field-studies-council.org
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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.core import *
from qgis.gui import *
from qgis.PyQt.QtCore import *
from qgis.PyQt.QtGui import *


class RectangleMapTool(QgsMapToolEmitPoint):

    boxDragged = pyqtSignal()

    def __init__(self, canvas, iface):
        self.canvas = canvas
        self.iface = iface
        QgsMapToolEmitPoint.__init__(self, self.canvas)
        self.rubberBand = QgsRubberBand(self.canvas)
        self.rubberBand.setColor(Qt.GlobalColor.black)
        self.rubberBand.setWidth(1)
        self.reset()

    def reset(self):
        self.startPoint = self.endPoint = None
        self.isEmittingPoint = False
        self.rubberBand.reset()

    def canvasPressEvent(self, e):
        self.startPoint = self.toMapCoordinates(e.pos())
        self.endPoint = self.startPoint
        self.isEmittingPoint = True
        self.showRect(self.startPoint, self.endPoint)

    def canvasReleaseEvent(self, e):
        self.isEmittingPoint = False
        r = self.rectangle()
        if r is not None:
            # strMessage = str(r.xMinimum()) + ":" +  str(r.yMinimum()) + ":" + str(r.xMaximum()) + ":" + str(r.yMaximum())
            # self.iface.messageBar().pushMessage("Output", strMessage, level=Qgis.Info)
            self.xMinimum = r.xMinimum()
            self.xMaximum = r.xMaximum()
            self.yMinimum = r.yMinimum()
            self.yMaximum = r.yMaximum()
            self.rubberBand.reset()
            self.boxDragged.emit()

    def canvasMoveEvent(self, e):
        if not self.isEmittingPoint:
            return

        self.endPoint = self.toMapCoordinates(e.pos())
        self.showRect(self.startPoint, self.endPoint)

    def showRect(self, startPoint, endPoint):
        self.rubberBand.reset()
        if startPoint.x() == endPoint.x() or startPoint.y() == endPoint.y():
            return

        point1 = QgsPoint(startPoint.x(), startPoint.y())
        point2 = QgsPoint(startPoint.x(), endPoint.y())
        point3 = QgsPoint(endPoint.x(), endPoint.y())
        point4 = QgsPoint(endPoint.x(), startPoint.y())

        points = [point1, point2, point3, point4, point1]
        self.rubberBand.setToGeometry(QgsGeometry.fromPolyline(points), None)

    def rectangle(self):
        if self.startPoint is None or self.endPoint is None:
            return None
        elif self.startPoint.x() == self.endPoint.x() or self.startPoint.y() == \
                self.endPoint.y():
            return None

        return QgsRectangle(self.startPoint, self.endPoint)

    def deactivate(self):
        # AttributeError: 'NoneType' object has no attribute 'deactivate'
        # QgsMapTool.deactivate(self)
        # self.emit(SIGNAL("deactivated()"))
        pass
