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

"""
***************************************************************************
    Gridify.py
    ---------------------
    Date                 : May 2010
    Copyright            : (C) 2010 by Michael Minn
    Email                : pyqgis at michaelminn 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__ = 'Michael Minn'
__date__ = 'May 2010'
__copyright__ = '(C) 2010, Michael Minn'

# 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 processing.core.GeoAlgorithm import GeoAlgorithm
from processing.core.GeoAlgorithmExecutionException import \
        GeoAlgorithmExecutionException
from processing.core.parameters import ParameterVector
from processing.core.parameters import ParameterTableField
from processing.core.parameters import ParameterSelection
from processing.core.outputs import OutputVector

from processing.tools import dataobjects, vector

class HubLines(GeoAlgorithm):
    HUBS = 'HUBS'
    HUB_FIELD = 'HUB_FIELD'
    SPOKES = 'SPOKES'
    SPOKE_FIELD = 'SPOKE_FIELD'
    OUTPUT = 'OUTPUT'

    def defineCharacteristics(self):
        self.name = 'Hub lines'
        self.group = 'Vector analysis tools'

        self.addParameter(ParameterVector(self.HUBS,
            self.tr('Hub point layer'), [ParameterVector.VECTOR_TYPE_ANY]))
        self.addParameter(ParameterTableField(self.HUB_FIELD,
            self.tr('Hub ID field'), self.HUBS))
        self.addParameter(ParameterVector(self.SPOKES,
            self.tr('Spoke point layer'), [ParameterVector.VECTOR_TYPE_ANY]))
        self.addParameter(ParameterTableField(self.SPOKE_FIELD,
            self.tr('Spoke ID field'), self.SPOKES))

        self.addOutput(OutputVector(self.OUTPUT, self.tr('Output')))

    def processAlgorithm(self, progress):
        layerHub = dataobjects.getObjectFromUri(
            self.getParameterValue(self.HUBS))
        layerSpoke = dataobjects.getObjectFromUri(
            self.getParameterValue(self.SPOKES))

        fieldHub = self.getParameterValue(self.HUB_FIELD)
        fieldSpoke = self.getParameterValue(self.SPOKE_FIELD)

        if layerHub.source() == layerSpoke.source():
            raise GeoAlgorithmExecutionException(
                self.tr('Same layer given for both hubs and spokes'))

        writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(
            layerSpoke.pendingFields(), QGis.WKBLineString, layerSpoke.crs())

        spokes = vector.features(layerSpoke)
        hubs = vector.features(layerHub)

        count = len(spokes)
        total = 100.0 / float(count)

        for count, spokepoint in enumerate(spokes):
            p = spokepoint.geometry().boundingBox().center()
            spokeX = p.x()
            spokeY = p.y()
            spokeId = unicode(spokepoint[fieldSpoke])

            for hubpoint in hubs:
                hubId = unicode(hubpoint[fieldHub])
                if hubId == spokeId:
                    p = hubpoint.geometry().boundingBox().center()
                    hubX = p.x()
                    hubY = p.y()

                    f = QgsFeature()
                    f.setAttributes(spokepoint.attributes())
                    f.setGeometry(QgsGeometry.fromPolyline(
                        [QgsPoint(spokeX, spokeY), QgsPoint(hubX, hubY)]))
                    writer.addFeature(f)

                    break

            progress.setPercentage(int(count * total))

        del writer