# -*- coding: utf-8 -*-

"""
***************************************************************************
    SelectByLocation.py
    ---------------------
    Date                 : August 2012
    Copyright            : (C) 2012 by Victor Olaya
    Email                : volayaf at gmail dot com
***************************************************************************
*                                                                         *
*   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.                                   *
*                                                                         *
***************************************************************************
"""

__author__ = 'Victor Olaya'
__date__ = 'August 2012'
__copyright__ = '(C) 2012, Victor Olaya'
# This will get replaced with a git SHA1 when you do a git archive
__revision__ = '$Format:%H$'

from PyQt4.QtCore import *
from qgis.core import *
from sextante.core.GeoAlgorithm import GeoAlgorithm
from sextante.core.QGisLayers import QGisLayers
from sextante.parameters.ParameterSelection import ParameterSelection
from sextante.parameters.ParameterVector import ParameterVector


from sextante.outputs.OutputVector import OutputVector

class SelectByLocation(GeoAlgorithm):

    INPUT = "INPUT"
    INTERSECT = "INTERSECT"
    METHOD = "METHOD"    
    OUTPUT = "OUTPUT"

    METHODS = ["creating new selection",
               "adding to current selection",
               "removing from current selection"]

    #===========================================================================
    # def getIcon(self):
    #    return QtGui.QIcon(os.path.dirname(__file__) + "/icons/select_location.png")
    #===========================================================================

    def defineCharacteristics(self):
        self.name = "Select by location"
        self.group = "Vector selection tools"
        self.addParameter(ParameterVector(self.INPUT, "Layer to select from", ParameterVector.VECTOR_TYPE_ANY))
        self.addParameter(ParameterVector(self.INTERSECT, "Additional layer (intersection layer)", ParameterVector.VECTOR_TYPE_ANY))
        self.addParameter(ParameterSelection(self.METHOD, "Modify current selection by", self.METHODS, 0))        
        self.addOutput(OutputVector(self.OUTPUT, "Selection", True))

    def processAlgorithm(self, progress):
        filename = self.getParameterValue(self.INPUT)
        inputLayer = QGisLayers.getObjectFromUri(filename)
        method = self.getParameterValue(self.METHOD)
        filename = self.getParameterValue(self.INTERSECT)
        selectLayer = QGisLayers.getObjectFromUri(filename)
        inputProvider = inputLayer.dataProvider()

        oldSelection = set(inputLayer.selectedFeaturesIds())                
        index = QgsSpatialIndex()
        feat = QgsFeature()
        for feat in inputLayer.getFeatures():        
            index.insertFeature(feat)
     
        infeat = QgsFeature()
        geom = QgsGeometry()
        selectedSet = []        
        current = 0
        features = QGisLayers.features(selectLayer)
        total = 100.0 / float(len(features))
        for feat in features:
            geom = QgsGeometry(feat.geometry())
            intersects = index.intersects(geom.boundingBox())
            for i in intersects:
                inputLayer.featureAtId(i, infeat, True)
                tmpGeom = QgsGeometry( infeat.geometry() )
                if geom.intersects(tmpGeom):
                    selectedSet.append(infeat.id())
            current += 1
            progress.setPercentage(int(current * total))

        if method == 1:
            selectedSet = list(oldSelection.union(selectedSet))
        elif method == 2:
            selectedSet = list(oldSelection.difference(selectedSet))

        inputLayer.setSelectedFeatures(selectedSet)
        self.setOutputValue(self.OUTPUT, filename)