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

"""
***************************************************************************
    Centroids.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 archive323

__revision__ = '$Format:%H$'

import os

from qgis.PyQt.QtGui import QIcon

from qgis.core import (QgsWkbTypes,
                       QgsProcessingUtils,
                       QgsMessageLog)

from processing.core.GeoAlgorithm import GeoAlgorithm
from processing.core.parameters import ParameterVector
from processing.core.outputs import OutputVector
from processing.tools import dataobjects, vector

pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]


class Centroids(GeoAlgorithm):

    INPUT_LAYER = 'INPUT_LAYER'
    OUTPUT_LAYER = 'OUTPUT_LAYER'

    def icon(self):
        return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'centroids.png'))

    def group(self):
        return self.tr('Vector geometry tools')

    def name(self):
        return 'centroids'

    def displayName(self):
        return self.tr('Centroids')

    def defineCharacteristics(self):
        self.addParameter(ParameterVector(self.INPUT_LAYER,
                                          self.tr('Input layer')))

        self.addOutput(OutputVector(self.OUTPUT_LAYER, self.tr('Centroids'), datatype=[dataobjects.TYPE_VECTOR_POINT]))

    def processAlgorithm(self, context, feedback):
        layer = dataobjects.getLayerFromString(
            self.getParameterValue(self.INPUT_LAYER))

        writer = self.getOutputFromName(
            self.OUTPUT_LAYER).getVectorWriter(layer.fields(), QgsWkbTypes.Point, layer.crs(), context)

        features = QgsProcessingUtils.getFeatures(layer, context)
        total = 100.0 / QgsProcessingUtils.featureCount(layer, context)
        for current, input_feature in enumerate(features):
            output_feature = input_feature
            if input_feature.geometry():
                output_geometry = input_feature.geometry().centroid()
                if not output_geometry:
                    QgsMessageLog.logMessage('Error calculating centroid for feature {}'.format(input_feature.id()), self.tr('Processing'), QgsMessageLog.WARNING)
                output_feature.setGeometry(output_geometry)

            writer.addFeature(output_feature)
            feedback.setProgress(int(current * total))

        del writer