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

"""
***************************************************************************
    BarPlot.py
    ---------------------
    Date                 : January 2013
    Copyright            : (C) 2013 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__ = 'January 2013'
__copyright__ = '(C) 2013, Victor Olaya'

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

__revision__ = '$Format:%H$'

import matplotlib.pyplot as plt
import matplotlib.pylab as lab
import numpy as np
from PyQt4.QtCore import *
from qgis.core import *
from processing.parameters.ParameterTable import ParameterTable
from processing.parameters.ParameterTableField import ParameterTableField
from processing.core.GeoAlgorithm import GeoAlgorithm
from processing.outputs.OutputHTML import OutputHTML
from processing.tools import *


class BarPlot(GeoAlgorithm):

    INPUT = 'INPUT'
    OUTPUT = 'OUTPUT'
    NAME_FIELD = 'NAME_FIELD'
    VALUE_FIELD = 'VALUE_FIELD'

    def processAlgorithm(self, progress):
        uri = self.getParameterValue(self.INPUT)
        layer = getObjectFromUri(uri)
        namefieldname = self.getParameterValue(self.NAME_FIELD)
        valuefieldname = self.getParameterValue(self.VALUE_FIELD)
        output = self.getOutputValue(self.OUTPUT)
        values = vector.getAttributeValues(layer, namefieldname,
                                           valuefieldname)
        plt.close()

        ind = np.arange(len(values[namefieldname]))
        width = 0.8
        plt.bar(ind, values[valuefieldname], width, color='r')

        plt.xticks(ind, values[namefieldname], rotation=45)
        plotFilename = output + '.png'
        lab.savefig(plotFilename)
        f = open(output, 'w')
        f.write('<img src="' + plotFilename + '"/>')
        f.close()

    def defineCharacteristics(self):
        self.name = 'Bar plot'
        self.group = 'Graphics'
        self.addParameter(ParameterTable(self.INPUT, 'Input table'))
        self.addParameter(ParameterTableField(self.NAME_FIELD,
                          'Category name field', self.INPUT))
        self.addParameter(ParameterTableField(self.VALUE_FIELD, 'Value field',
                          self.INPUT))
        self.addOutput(OutputHTML(self.OUTPUT, 'Output'))
