# Copyright INRA (Institut National de la Recherche Agronomique)
# http://www.inra.fr
# http://urgi.versailles.inra.fr
#
# This software is governed by the CeCILL license under French law and
# abiding by the rules of distribution of free software.  You can  use, 
# modify and/ or redistribute the software under the terms of the CeCILL
# license as circulated by CEA, CNRS and INRIA at the following URL
# "http://www.cecill.info". 
#
# As a counterpart to the access to the source code and  rights to copy,
# modify and redistribute granted by the license, users are provided only
# with a limited warranty  and the software's author,  the holder of the
# economic rights,  and the successive licensors  have only  limited
# liability. 
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# In this respect, the user's attention is drawn to the risks associated
# with loading,  using,  modifying and/or developing or reproducing the
# software by the user in light of its specific status of free software,
# that may mean  that it is complicated to manipulate,  and  that  also
# therefore means  that it is reserved for developers  and  experienced
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import re
import sys
from commons.core.utils.RepetConfigParser import RepetConfigParser
from commons.core.checker.ConfigValue import ConfigValue
from commons.core.checker.IChecker import IChecker
from commons.core.checker.RepetException import RepetException
from commons.core.utils.FileUtils import FileUtils


class Rule(object):
    
    def __init__(self, mandatory= False, isPattern=False, type="", set=(), help =""):
        self.mandatory = mandatory
        self.isPattern = isPattern
        self.type = type
        self.set = set
        self.help = help
        
class ConfigRules(object):
    
    def __init__(self, configName = "", configDescription = ""):
        self.configName = configName
        self.configDescription = configDescription
        self.dRules4Sections={}
        
    def _addRule(self, section, option="DEFAULT", mandatory=False, isPattern=False, type="", set=(), help =""):
        if not self.dRules4Sections.has_key(section):
            self.dRules4Sections[section] = {}
        self.dRules4Sections[section][option]=Rule(mandatory, isPattern, type.lower(), set) 
        
    def addRuleSection(self, section, mandatory=False, isPattern=False, help = ""):
        self._addRule(section = section, option = "DEFAULT", mandatory = mandatory, isPattern =  isPattern, help = "")
   
    def addRuleOption(self, section, option, mandatory=False, isPattern=False, type="", set=(), help = ""):
        self._addRule(section = section, option = option, mandatory = mandatory, isPattern =  isPattern, type = type, set=set , help = "")
            
    def isSectionMandatory(self, section):
        if self.dRules4Sections.has_key(section):
            if self.dRules4Sections[section].has_key("DEFAULT"):
                return self.dRules4Sections[section]["DEFAULT"].mandatory
        return False
        
    def isOptionMandatory(self, section, option):
        if self.dRules4Sections.has_key(section):
            if self.dRules4Sections[section].has_key(option):
                return self.dRules4Sections[section][option].mandatory
        return False
    
    def getRule(self, section, option):
        if self.dRules4Sections.has_key(section):
            if self.dRules4Sections[section].has_key(option):
                return self.dRules4Sections[section][option]
        return None
    
class ConfigChecker(IChecker):
    
    def __init__ (self, cfgFileName, iCfgRules):
        self._configFileName = cfgFileName
        self._iConfigRules = iCfgRules
        self._iRawConfig = ConfigValue()
        self._iExtendedConfigRules = ConfigRules()
        
    def readConfigFile(self):
        iConfig = RepetConfigParser()
        try:
            iConfig.readfp(open(self._configFileName))
            return iConfig
# TODO USE OF CONFIG ERROR
#            if DuplicateSectionError:
#                raise Exception ("Duplicate section exist in config file %s" %(self._configFileName ))
        except :
            raise RepetException ("Unexpected error: %s" %  sys.exc_info()[0])
        
    def setRawConfig(self, iConfig ):
        for sectionName in iConfig.sections(): 
            for optionName in iConfig.options(sectionName):
                optionValue = iConfig.get(sectionName, optionName)
                self._iRawConfig.set(sectionName, optionName, optionValue)
                
    def getOptionValueAccordingRule(self, iConfig, sectionName, optionName):
        optionRule = self._iExtendedConfigRules.getRule(sectionName, optionName)
        if optionRule == None : 
            return iConfig.get(sectionName, optionName)
        
        if optionRule.type == "int":
            optionValue = iConfig.getint(sectionName, optionName)
        elif optionRule.type == "float":
            optionValue = iConfig.getfloat(sectionName, optionName)
        elif optionRule.type == "bool" or optionRule.type == "boolean":
            optionValue = iConfig.getboolean(sectionName, optionName)
        else:
            optionValue = iConfig.get(sectionName, optionName)
        if optionRule.set!=() and not(optionValue in optionRule.set):  
            #TODO : test and fix    
            raise RepetException ("value must be in %s " % set.__repr__())
        
        return optionValue
    
    def setConfig(self, iConfig ):
        config = ConfigValue()
        valueErr = ""
        for sectionName in iConfig.sections():
            for optionName in iConfig.options(sectionName):
                try:    
                    optionValue = self.getOptionValueAccordingRule(iConfig, sectionName, optionName )
                    config.set(sectionName, optionName, optionValue)
                except RepetException, re :
                    #TODO : test and fix    
                    valueErr += "\n - [%s]: %s %s" % re.getMessage()
        if valueErr == "":
            self._iRawConfig = config
        else:
            raise RepetException ("Following errors occurs:%s\n" %valueErr)
        
    def checkIfExistsConfigFile (self):   
        if not (FileUtils.isRessourceExists(self._configFileName)):
            raise RepetException("CONFIG FILE not found - '%s'" % self._configFileName)
    
    def checkMandatorySections (self):
        missingSection = ""
        for sectionName in self._iExtendedConfigRules.dRules4Sections.keys():
            if self._iExtendedConfigRules.isSectionMandatory(sectionName) and not self._iRawConfig.has_section(sectionName):
                    missingSection += "\n - %s" %(sectionName)
        if missingSection != "":
            raise RepetException ("Error in configuration file %s, following sections are missing:%s\n" % (self._configFileName, missingSection))
    
    def checkMandatoryOptions (self):
        missingOption = ""
        for sectionName in self._iExtendedConfigRules.dRules4Sections.keys():
            if self._iExtendedConfigRules.isSectionMandatory(sectionName) or self._iRawConfig.has_section(sectionName) :
                dRules4OptionsOfThisSection = self._iExtendedConfigRules.dRules4Sections[sectionName]
                for optionName in dRules4OptionsOfThisSection.keys():
                    if optionName != "DEFAULT" and self._iExtendedConfigRules.isOptionMandatory(sectionName, optionName) and not self._iRawConfig.has_option(sectionName, optionName):
                        missingOption += "\n - [%s]: %s" % (sectionName, optionName)
        if missingOption != "":
            raise RepetException ("Error in configuration file %s, following options are missing: %s\n" % (self._configFileName, missingOption))
    
    def getSectionNamesAccordingPatternRules (self, sectionWordOrPattern, isPattern):          
        lSectionsFoundAccordingPatternRules=[]
        if isPattern == False:
            if self._iRawConfig.has_section(sectionWordOrPattern):
                lSectionsFoundAccordingPatternRules.append(sectionWordOrPattern)
        else:
            for sectionName in self._iRawConfig.sections():
                if re.search(sectionWordOrPattern, sectionName, re.IGNORECASE):
                    lSectionsFoundAccordingPatternRules.append(sectionName)
        return lSectionsFoundAccordingPatternRules
    
    def getOptionsNamesAccordingPatternRules(self, sectionName, optionWordOrPattern, isPattern):
        lOptionsFoundAccordingPatternRules=[]
        if isPattern == False:
            if self._iRawConfig.has_option(sectionName, optionWordOrPattern):
                lOptionsFoundAccordingPatternRules.append(optionWordOrPattern)
        else :
            for optionName in self._iRawConfig.options(sectionName):
                if re.search(optionWordOrPattern, optionName, re.IGNORECASE)!= None:
                    lOptionsFoundAccordingPatternRules.append(optionName)
        return lOptionsFoundAccordingPatternRules
    
    def extendConfigRulesWithPatternRules(self):
        for sectionName in self._iConfigRules.dRules4Sections.keys():
            dRules4OptionsOfThisSection = self._iConfigRules.dRules4Sections[sectionName] 
            lRawSections=[]
            if dRules4OptionsOfThisSection.has_key("DEFAULT"):
                mandatorySection = dRules4OptionsOfThisSection["DEFAULT"].mandatory
                isPatternSection = dRules4OptionsOfThisSection["DEFAULT"].isPattern
                lRawSections=self.getSectionNamesAccordingPatternRules(sectionName, isPatternSection)
                for rawSectionName in lRawSections:
                    self._iExtendedConfigRules.addRuleSection(rawSectionName, "DEFAULT", mandatorySection )
                if mandatorySection and (len(lRawSections)==0):
                    self._iExtendedConfigRules.addRuleSection(sectionName, "DEFAULT", mandatorySection )
            else:
                lRawSections.append(sectionName) 
            for optionName in dRules4OptionsOfThisSection.keys():
                setOption = dRules4OptionsOfThisSection[optionName].set
                isPatternOption = dRules4OptionsOfThisSection[optionName].isPattern
                mandatoryOption = dRules4OptionsOfThisSection[optionName].mandatory
                typeOption = dRules4OptionsOfThisSection[optionName].type
                if optionName != "DEFAULT":
                    for rawSectionName in lRawSections:
                        lRawOptions=self.getOptionsNamesAccordingPatternRules(rawSectionName, optionName, isPatternOption)
                        for rawOptionName in lRawOptions:
                            self._iExtendedConfigRules.addRuleOption(rawSectionName, rawOptionName, mandatoryOption, False, typeOption, setOption)
                        if mandatoryOption and (len(lRawOptions)==0):
                            self._iExtendedConfigRules.addRuleOption(rawSectionName, optionName, mandatoryOption, False, typeOption, setOption)
                                                          
    def getConfig(self):
        self.checkIfExistsConfigFile()
        iConfig = self.readConfigFile()
        self.setRawConfig(iConfig)
        self.extendConfigRulesWithPatternRules()
        self.checkMandatorySections()
        self.checkMandatoryOptions()
        self.setConfig(iConfig)
        return self._iRawConfig