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

"""
***************************************************************************
    peukerdouglas.py
    ---------------------
    Date                 : October 2012
    Copyright            : (C) 2012 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 2012'
__copyright__ = '(C) 2012, Alexander Bruy'
# This will get replaced with a git SHA1 when you do a git archive
__revision__ = '$Format:%H$'

import os

from PyQt4.QtGui import *

from processing.core.GeoAlgorithm import GeoAlgorithm
from processing.core.ProcessingLog import ProcessingLog
from processing.core.ProcessingUtils import ProcessingUtils
from processing.core.ProcessingConfig import ProcessingConfig
from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException

from processing.parameters.ParameterRaster import ParameterRaster
from processing.parameters.ParameterNumber import ParameterNumber

from processing.outputs.OutputRaster import OutputRaster

from processing.taudem.TauDEMUtils import TauDEMUtils

class PeukerDouglas(GeoAlgorithm):
    ELEVATION_GRID = "ELEVATION_GRID"
    CENTER_WEIGHT = "CENTER_WEIGHT"
    SIDE_WEIGHT = "SIDE_WEIGHT"
    DIAGONAL_WEIGHT = "DIAGONAL_WEIGHT"

    STREAM_SOURCE_GRID = "STREAM_SOURCE_GRID"

    def getIcon(self):
        return  QIcon(os.path.dirname(__file__) + "/../images/taudem.png")

    def defineCharacteristics(self):
        self.name = "Peuker Douglas"
        self.cmdName = "peukerdouglas"
        self.group = "Stream Network Analysis tools"

        self.addParameter(ParameterRaster(self.ELEVATION_GRID, "Elevation Grid", False))
        self.addParameter(ParameterNumber(self.CENTER_WEIGHT, "Center Smoothing Weight", 0, None, 0.4))
        self.addParameter(ParameterNumber(self.SIDE_WEIGHT, "Side Smoothing Weight", 0, None, 0.1))
        self.addParameter(ParameterNumber(self.DIAGONAL_WEIGHT, "Diagonal Smoothing Weight", 0, None, 0.05))

        self.addOutput(OutputRaster(self.STREAM_SOURCE_GRID, "Stream Source Grid"))

    def processAlgorithm(self, progress):
        commands = []
        commands.append(os.path.join(TauDEMUtils.mpiexecPath(), "mpiexec"))

        processNum = ProcessingConfig.getSetting(TauDEMUtils.MPI_PROCESSES)
        if processNum <= 0:
          raise GeoAlgorithmExecutionException("Wrong number of MPI processes used.\nPlease set correct number before running TauDEM algorithms.")

        commands.append("-n")
        commands.append(str(processNum))
        commands.append(os.path.join(TauDEMUtils.taudemPath(), self.cmdName))
        commands.append("-fel")
        commands.append(self.getParameterValue(self.ELEVATION_GRID))
        commands.append("-par")
        commands.append(str(self.getParameterValue(self.CENTER_WEIGHT)))
        commands.append(str(self.getParameterValue(self.SIDE_WEIGHT)))
        commands.append(str(self.getParameterValue(self.DIAGONAL_WEIGHT)))
        commands.append("-ss")
        commands.append(self.getOutputValue(self.STREAM_SOURCE_GRID))

        loglines = []
        loglines.append("TauDEM execution command")
        for line in commands:
            loglines.append(line)
        ProcessingLog.addToLog(ProcessingLog.LOG_INFO, loglines)

        TauDEMUtils.executeTauDEM(commands, progress)

    #def helpFile(self):
    #    return os.path.join(os.path.dirname(__file__), "help", self.cmdName + ".html")