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

"""
***************************************************************************
    lengtharea.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.tools.system import *
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 LengthArea(GeoAlgorithm):
    LENGTH_GRID = "LENGTH_GRID"
    CONTRIB_AREA_GRID = "CONTRIB_AREA_GRID"
    THRESHOLD = "THRESHOLD"
    EXPONENT = "EXPONENT"

    STREAM_SOURCE_GRID = "STREAM_SOURCE_GRID"

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

    def defineCharacteristics(self):
        self.name = "Length Area Stream Source"
        self.cmdName = "lengtharea"
        self.group = "Stream Network Analysis tools"

        self.addParameter(ParameterRaster(self.LENGTH_GRID, "Length Grid", False))
        self.addParameter(ParameterRaster(self.CONTRIB_AREA_GRID, "Contributing Area Grid", False))
        self.addParameter(ParameterNumber(self.THRESHOLD, "Threshold", 0, None, 0.03))
        self.addParameter(ParameterNumber(self.EXPONENT, "Exponent", 0, None, 1.3))

        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("-plen")
        commands.append(self.getParameterValue(self.LENGTH_GRID))
        commands.append("-ad8")
        commands.append(self.getParameterValue(self.CONTRIB_AREA_GRID))
        commands.append("-par")
        commands.append(str(self.getParameterValue(self.THRESHOLD)))
        commands.append(str(self.getParameterValue(self.EXPONENT)))
        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")