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

"""
***************************************************************************
    ogrsql.py
    ---------------------
    Date                 : November 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__ = 'November 2012'
__copyright__ = '(C) 2012, Victor Olaya'

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

__revision__ = '$Format:%H$'

from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
from processing.core.parameters import ParameterTable
from processing.core.parameters import ParameterString
from processing.core.parameters import ParameterSelection
from processing.core.outputs import OutputVector

from processing.algs.gdal.GdalUtils import GdalUtils
from processing.algs.gdal.GdalAlgorithm import GdalAlgorithm

from processing.tools.vector import ogrConnectionString


DIALECTS = [None, 'ogrsql', 'sqlite']


class OgrSql(GdalAlgorithm):

    INPUT = 'INPUT'
    OUTPUT = 'OUTPUT'
    SQL = 'SQL'
    DIALECT = 'DIALECT'

    def defineCharacteristics(self):
        self.name, self.i18n_name = self.trAlgorithm('Execute SQL')
        self.group, self.i18n_group = self.trAlgorithm('[OGR] Miscellaneous')

        self.addParameter(ParameterTable(self.INPUT, self.tr('Input layer or table')))
        self.addParameter(ParameterString(self.SQL, self.tr('SQL'), ''))

        self.addParameter(ParameterSelection(
            self.DIALECT,
            self.tr('Dialect'),
            DIALECTS)
        )

        self.addOutput(OutputVector(self.OUTPUT, self.tr('SQL result')))

    def getConsoleCommands(self):
        sql = self.getParameterValue(self.SQL)
        if sql == '':
            raise GeoAlgorithmExecutionException(
                self.tr('Empty SQL. Please enter valid SQL expression and try again.'))

        arguments = []
        arguments.append('-sql')
        arguments.append(sql)

        dialectIdx = self.getParameterValue(self.DIALECT)
        dialect = DIALECTS[dialectIdx]

        if dialect:
            arguments.append("-dialect")
            arguments.append(dialect)

        output = self.getOutputFromName(self.OUTPUT)
        outFile = output.value
        arguments.append(outFile)

        layer = self.getParameterValue(self.INPUT)
        conn = ogrConnectionString(layer)[1:-1]
        arguments.append(conn)

        return ['ogr2ogr', GdalUtils.escapeAndJoin(arguments)]