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

"""
***************************************************************************
    ExportGeometryInfo.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 processing import interface
from processing.core.GeoAlgorithm import GeoAlgorithm
from processing.tools import dataobjects, vector
from processing.parameters.ParameterVector import ParameterVector
from processing.parameters.ParameterSelection import ParameterSelection
from processing.outputs.OutputVector import OutputVector
from processing.tools import vector as utils

class ExportGeometryInfo(GeoAlgorithm):

    INPUT = "INPUT"
    METHOD = "CALC_METHOD"
    OUTPUT = "OUTPUT"

    CALC_METHODS = ["Layer CRS",
                    "Project CRS",
                    "Ellipsoidal"
                   ]

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

    def defineCharacteristics(self):
        self.name = "Export/Add geometry columns"
        self.group = "Vector table tools"

        self.addParameter(ParameterVector(self.INPUT, "Input layer", [ParameterVector.VECTOR_TYPE_ANY]))
        self.addParameter(ParameterSelection(self.METHOD, "Calculate using", self.CALC_METHODS, 0))

        self.addOutput(OutputVector(self.OUTPUT, "Output layer"))

    def processAlgorithm(self, progress):
        layer = dataobjects.getObjectFromUri(self.getParameterValue(self.INPUT))
        method = self.getParameterValue(self.METHOD)

        geometryType = layer.geometryType()

        idx1 = -1
        idx2 = -1
        fields = layer.pendingFields()

        if geometryType == QGis.Polygon:
            idx1, fields = utils.findOrCreateField(layer, fields, "area", 21, 6)
            idx2, fields = utils.findOrCreateField(layer, fields, "perimeter", 21, 6)
        elif geometryType == QGis.Line:
            idx1, fields = utils.findOrCreateField(layer, fields, "length", 21, 6)
            idx2 = idx1
        else:
            idx1, fields = utils.findOrCreateField(layer, fields, "xcoord", 21, 6)
            idx2, fields = utils.findOrCreateField(layer, fields, "ycoord", 21, 6)

        writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fields.toList(),
                     layer.dataProvider().geometryType(), layer.crs())

        print idx1, idx2

        ellips = None
        crs = None
        coordTransform = None

        # calculate with:
        # 0 - layer CRS
        # 1 - project CRS
        # 2 - ellipsoidal
        if method == 2:
            ellips = QgsProject.instance().readEntry("Measure", "/Ellipsoid", "NONE")[0]
            crs = layer.crs().srsid()
        elif method == 1:
            mapCRS = interface.iface.mapCanvas().mapRenderer().destinationCrs()
            layCRS = layer.crs()
            coordTransform = QgsCoordinateTransform(layCRS, mapCRS)

        outFeat = QgsFeature()
        inGeom = QgsGeometry()

        outFeat.initAttributes(len(fields))
        outFeat.setFields(fields)

        current = 0
        features = vector.features(layer)
        total = 100.0 / float(len(features))
        for f in features:
            inGeom = f.geometry()

            if method == 1:
                inGeom.transform(coordTransform)

            (attr1, attr2) = utils.simpleMeasure(inGeom, method, ellips, crs)

            outFeat.setGeometry(inGeom)
            attrs = f.attributes()
            attrs.insert(idx1, attr1)
            if attr2 is not None:
                attrs.insert(idx2, attr2)
            outFeat.setAttributes(attrs)
            writer.addFeature(outFeat)

            current += 1
            progress.setPercentage(int(current * total))

        del writer