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

"""
***************************************************************************
    IdwInterpolationAttribute.py
    ---------------------
    Date                 : October 2016
    Copyright            : (C) 2016 by Alexander Bruy
    Email                : alexander dot bruy 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__ = 'Alexander Bruy'
__date__ = 'October 2016'
__copyright__ = '(C) 2016, Alexander Bruy'

# This will get replaced with a git SHA1 when you do a git archive

__revision__ = '$Format:%H$'

import os

from qgis.PyQt.QtGui import QIcon

from qgis.core import QgsRectangle
from qgis.analysis import (QgsInterpolator,
                           QgsIDWInterpolator,
                           QgsGridFileWriter
                           )

from processing.core.GeoAlgorithm import GeoAlgorithm
from processing.core.parameters import ParameterVector
from processing.core.parameters import ParameterTableField
from processing.core.parameters import ParameterSelection
from processing.core.parameters import ParameterNumber
from processing.core.parameters import ParameterExtent
from processing.core.outputs import OutputRaster
from processing.tools import dataobjects

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


class IdwInterpolationAttribute(GeoAlgorithm):

    INPUT_LAYER = 'INPUT_LAYER'
    ATTRIBUTE = 'ATTRIBUTE'
    LAYER_TYPE = 'LAYER_TYPE'
    DISTANCE_COEFFICIENT = 'DISTANCE_COEFFICIENT'
    COLUMNS = 'COLUMNS'
    ROWS = 'ROWS'
    CELLSIZE_X = 'CELLSIZE_X'
    CELLSIZE_Y = 'CELLSIZE_Y'
    EXTENT = 'EXTENT'
    OUTPUT_LAYER = 'OUTPUT_LAYER'

    def getIcon(self):
        return QIcon(os.path.join(pluginPath, 'images', 'interpolation.png'))

    def defineCharacteristics(self):
        self.name, self.i18n_name = self.trAlgorithm('IDW interpolation (using attribute)')
        self.group, self.i18n_group = self.trAlgorithm('Interpolation')

        self.TYPES = [self.tr('Points'),
                      self.tr('Structure lines'),
                      self.tr('Break lines')
                      ]

        self.addParameter(ParameterVector(self.INPUT_LAYER,
                                          self.tr('Vector layer')))
        self.addParameter(ParameterTableField(self.ATTRIBUTE,
                                              self.tr('Interpolation attribute'),
                                              self.INPUT_LAYER,
                                              ParameterTableField.DATA_TYPE_NUMBER))
        self.addParameter(ParameterSelection(self.LAYER_TYPE,
                                             self.tr('Type'),
                                             self.TYPES,
                                             0))
        self.addParameter(ParameterNumber(self.DISTANCE_COEFFICIENT,
                                          self.tr('Distance coefficient P'),
                                          0.0, 99.99, 2.0))
        self.addParameter(ParameterNumber(self.COLUMNS,
                                          self.tr('Number of columns'),
                                          0, 10000000, 300))
        self.addParameter(ParameterNumber(self.ROWS,
                                          self.tr('Number of rows'),
                                          0, 10000000, 300))
        self.addParameter(ParameterNumber(self.CELLSIZE_X,
                                          self.tr('Cellsize X'),
                                          0.0, 999999.000000, 0.0))
        self.addParameter(ParameterNumber(self.CELLSIZE_Y,
                                          self.tr('Cellsize Y'),
                                          0.0, 999999.000000, 0.0))
        self.addParameter(ParameterExtent(self.EXTENT,
                                          self.tr('Extent')))
        self.addOutput(OutputRaster(self.OUTPUT_LAYER,
                                    self.tr('Interpolated')))

    def processAlgorithm(self, progress):
        layer = dataobjects.getObjectFromUri(
            self.getParameterValue(self.INPUT_LAYER))
        fieldName = self.getParameterValue(self.ATTRIBUTE)
        layerType = self.getParameterValue(self.LAYER_TYPE)
        coefficient = self.getParameterValue(self.DISTANCE_COEFFICIENT)
        columns = self.getParameterValue(self.COLUMNS)
        rows = self.getParameterValue(self.ROWS)
        cellsizeX = self.getParameterValue(self.CELLSIZE_X)
        cellsizeY = self.getParameterValue(self.CELLSIZE_Y)
        extent = self.getParameterValue(self.EXTENT).split(',')
        output = self.getOutputValue(self.OUTPUT_LAYER)

        xMin = float(extent[0])
        xMax = float(extent[1])
        yMin = float(extent[2])
        yMax = float(extent[3])
        bbox = QgsRectangle(xMin, yMin, xMax, yMax)

        layerData = QgsInterpolator.LayerData()
        layerData.vectorLayer = layer
        layerData.zCoordInterpolation = False
        layerData.interpolationAttribute = layer.dataProvider().fieldNameIndex(fieldName)

        if layerType == 0:
            layerData.mInputType = QgsInterpolator.POINTS
        elif layerType == 1:
            layerData.mInputType = QgsInterpolator.STRUCTURE_LINES
        else:
            layerData.mInputType = QgsInterpolator.BREAK_LINES

        interpolator = QgsIDWInterpolator([layerData])
        interpolator.setDistanceCoefficient(coefficient)

        writer = QgsGridFileWriter(interpolator,
                                   output,
                                   bbox,
                                   columns,
                                   rows,
                                   cellsizeX,
                                   cellsizeY)

        writer.writeFile()