# $Id$
# $URL$

logger = logging.getLogger('meresco.drilldown')
logger.debug("Starting logger")
drilldownConfig = configs['drilldown']
serverConfig = configs['server']
spy = any.spy()

fieldFeatures = any.getFieldFeatures()
drilldownFields =  any.getDrilldownFields( 'drilldownFields')
drilldownFieldsTop = any.getDrilldownFields( 'drilldownFields-top')

drilldownFieldsNoMultiLevel = []
drilldownFieldsNoMultiLevel.extend(drilldownFieldsTop)
drilldownFieldsNoMultiLevel.extend(drilldownFields)

space = "\n             "

def fieldAndTermSplit(fieldAndTerm):
    return fieldAndTerm.split(':', 1)

def fieldAndTermJoin(field, term):
    return '%s:%s' % (field, term)

def shrink(aString, maxLength=160):
    if len(aString) > maxLength:
        return aString[:maxLength] + '...'
    return aString

def createDrilldownQuery(drilldownArgs, sortKeys):
    newArguments = [];
    if sortKeys: newArguments.append(('sortKeys', sortKeys))
    for existing in drilldownArgs:
        # make sure to convert the unicode into a native string before calling urlencode 
        newArguments.append(('drilldown', str(existing)))
#    logger.debug(infra.prpt('newArguments',newArguments))
    return urlencode(newArguments)

def displayLabel(label):
    return '<div class="label">%s</div>' % label

def displayTerm(term, fieldName, language ):
    maxLength = int(drilldownConfig.get('maxFacetItemLength', section = 'behavior', default = "25"))
    if fieldName == 'drilldown.mods.genre': term = term.replace('info:eu-repo/semantics/', '')
    elif fieldName == 'drilldown.meta.repository.repositoryGroupId':
        term = drilldownConfig.get(term, section = 'sourceName')
    elif fieldName == 'drilldown.norm.date.decennium':
	to = int(term) + 9
	term = term + '-' + str(to)
    elif fieldName == 'drilldown.norm.date.centennium':
	to = int(term) + 99
	term = term + '-' + str(to)
    return shrink(term, maxLength)

def displayItem(query, term, selected, field, language, count):
    text = escapeHtml(displayTerm(term, field, language)) + ' <span class="count">(' + str(count) + ')</span>'
    if selected:
        s = ''
    else:
        s = '<div class="item"><a href="?' + query + '" title="' + escapeHtml(term) + '"'
        s += 'onclick="return relocateKeepQueryHref(\'' + query + '\')">'
        s += text
        s += '</a></div>'
    return s

def showFacets(idType, text,  label, showButton):
    if idType == 'full':
        if (showButton == True):
            displayType = 'none'
        else:
            displayType = 'blocked'

        buttonText = drilldownConfig.get('less', section = 'facets')
    else:
        displayType = 'block'
        buttonText = drilldownConfig.get('more', section = 'facets')

    s = space + '<div class="facet" id="' + idType + '-' + label + '"'
    s += ' style="display:' + displayType + '"'
    s += '>' + displayLabel(label) + text
    if (showButton):
        s += '<a title="' +  buttonText + '" '
        s += ' class="MoreOrLess" onclick="morelessFacets( \'' + buttonText + '\',\'' + label + '\')" '
        s += ' >' + buttonText + '</a>'
    s += '</div>'
    return s;

def displayItemGroup(label, termCounts, selectedFacets, fieldName, selectedFieldNames, arguments, language, sortKeys):
#    logger.debug(infra.prpt('fieldFeatures', fieldFeatures))
    
    if fieldName in fieldFeatures:
        limit = int(fieldFeatures[fieldName][1])
    else:
        logger.error('Fieldname: "' + str(fieldName) + '" NOT decleared in server.cfg[indices]drilldownFieldNames')
        limit = int(drilldownConfig.get('defaultDefaultDisplaySize',section = 'facets', default = '5'))

    growingString =  totalString =  choppedString = ''
    showButton = False
#    logger.debug(infra.prpt('termCount', termCounts))
#    logger.debug('fieldname: ' + fieldName + ' limit: ' + str(limit) + 'aantal: ' )

    forceCollapse = 0
    if limit < 0: forceCollapse = 1

    number = 0
    for term, count in termCounts:
        number += 1
#        logger.debug('label: ' + label + 'term: ' + term + 'count: ' + str(count))

        limit -= 1
        if fieldName in selectedFieldNames and term in selectedFieldNames[fieldName]:
            drilldownArgs = list(selectedFacets)
            drilldownArgs.remove(fieldName + ":" + term)
            query = createDrilldownQuery(drilldownArgs, sortKeys)
            growingString += displayItem(query, term, True, fieldName, language, count)
        else:
            drilldownArgs = list(arguments.get('drilldown', []) + [fieldAndTermJoin(fieldName, term)])
            query = createDrilldownQuery(drilldownArgs, sortKeys)
            growingString += displayItem(query, term, False, fieldName, language, count)

        if (limit == 0):
            choppedString = growingString
            showButton = True

    if len(choppedString) and len (choppedString) < len (growingString):
        showButton = True
    elif len (choppedString) == len (growingString):
        choppedString = ''
        showButton = False

    if forceCollapse:
        choppedString = ' '
        showButton = True

    if (number > 0):
        if choppedString:
            totalString += showFacets( 'chopped', choppedString, label, showButton) ;

        if growingString:
            totalString += showFacets( 'full', growingString,  label ,  showButton);


    return totalString

def displayFilter(query, term , category, selection):
    logger.debug(infra.prpt('******** Query:', query))
    deselectImage = '/files/' + drilldownConfig.get('deselect', section='images')

    s =  '<div class="facet"><div class="item"><a href="' + query + '" title="deselect:' + term +'" '
    s += 'onclick="return relocateKeepQueryHref(\'' + query +'\')">'
    s += '<img class="deselect" src="' + deselectImage + '" alt="deselect' + term + '"/>' + escapeHtml(selection)
    s += '</a></div></div>'
    return s

def displayDrilldownExtraLabel(levelField, selectedFieldNames,
                               language, selectedFacets, sortKeys, total ):
    previousUpField = ""
    s = ''
    upField = ""

    if levelField == "drilldown.norm.date.decennium" and "drilldown.norm.date.centennium" in selectedFieldNames:
        upField = "drilldown.norm.date.centennium"
    elif levelField == "drilldown.norm.date.year" and "drilldown.norm.date.centennium" in selectedFieldNames:
        upField = "drilldown.norm.date.centennium"
    elif levelField == "drilldown.norm.date.year" and "drilldown.norm.date.decennium" in selectedFieldNames:
        upField = "drilldown.norm.date.decennium"
    elif levelField == "drilldown.norm.name.oneinitial" and "drilldown.norm.name.lastname" in selectedFieldNames:
        upField = "drilldown.norm.name.lastname"
    if upField:
        for term in selectedFieldNames[upField]:
            if not (upField == previousUpField):
#                label = drilldownFieldNames.get(upField, {'en':upField, 'nl':upField})[language]
                label = drilldownConfig.get(upField, section = 'fieldNames')
                s += displayLabel(label)
            drilldownArgs = list(selectedFacets)
            drilldownArgs.remove(upField + ":" + term)
            query = createDrilldownQuery(drilldownArgs, sortKeys)
            s += displayItem(query, term, True, upField, language, total)
            previousUpField = upField
    return s

def displayDrilldownFields(total, docset, drilldownResults, multilevelResults, arguments, language):
    chooseFromTitle = drilldownConfig.get('choosefrom')
    selectedFacets = arguments.get('drilldown', [])

    selectedFieldNames = {}
    if selectedFacets:
        for drilldownItem in selectedFacets:
            fieldName, value = fieldAndTermSplit(drilldownItem)
	    if not fieldName in selectedFieldNames: selectedFieldNames[fieldName] = []
            selectedFieldNames[fieldName].append(value)
    yield '<div class="list">'
    yield '<div class="heading">' + chooseFromTitle +'</div>'

    sortKeys = arguments.get('sortKeys', [''])[0]

    if multilevelResults or total < 5000000:
        # TP: result set is not too large, multilevel results will be calculated
        # or this is already done (multilevelResults)

        if not multilevelResults:
            # Note: using a UvT version of multiLevelDrilldown
            multilevelResults = any.multiLevelDrilldown(docset, (['date', 'author']))
            
            for (fieldName, levelField), termCounts in multilevelResults:
#                logger.debug("fieldName: " + fieldName + ', levelField: ' + levelField)
                
                if levelField == None or levelField == '':
                    logger.error("displayDrilldownFields skipping record: " + fieldName )
                    continue

                yield displayDrilldownExtraLabel(levelField, selectedFieldNames,
                                                 language, selectedFacets, sortKeys, total)

                label = drilldownConfig.get(levelField, section = 'fieldNames',default='LEEG')

                yield displayItemGroup(label, termCounts, selectedFacets, levelField, selectedFieldNames,
                                       arguments, language, sortKeys)
        else:
            for fieldName in multilevelResults:
                result = multilevelResults[fieldName]
                levelField = ''
                if not 'level' in result:
                   logger.error("displayDrilldownFields skipping record: " + fieldName )
                else: levelField = result['level']

                label = drilldownConfig.get(levelField, section = 'fieldNames',default='LEEG')
                termCounts = result['termCounts']
                yield displayItemGroup(label, termCounts, selectedFacets, levelField, selectedFieldNames,
                                       arguments, language, sortKeys)

        fields = drilldownFields
        # fields = sortedDrilldownFields
    else:
        # TP: result set is too large, only one level of the multilevel facests will be calculated.
        fields = drilldownFieldsNoMultiLevel

#    spy(infra.prpt("fields",fields))
#    spy(infra.prpt('------------------------drilldownResults' ,  drilldownResults))

    if not drilldownResults:
        drilldownResults = any.drilldown(docset, fields)
        drilldownResultsAsDict = dict(drilldownResults)
    else: drilldownResultsAsDict = drilldownResults

    for fieldName, number, sorted in fields:
        termCounts = []
        if fieldName in drilldownResults:
            termCounts = drilldownResults[fieldName]
        else:
            termCounts = drilldownResultsAsDict.get(fieldName,[])
        label = drilldownConfig.get(fieldName, section = 'fieldNames')
        if termCounts == []:
            continue

        yield displayItemGroup(label, termCounts, selectedFacets, fieldName, selectedFieldNames, arguments, language, sortKeys)
    yield """
    %(space)s </div>
    %(space)s <! -- close drilldownfields -->""" % {'space': space}

def main(total, docset, drilldownResults, multilevelResults, arguments, path='', *args, **kwargs):
### forcing english as language
    language = 'en'
#    language = path.startswith('/en/') and 'en' or 'nl'
    drilldownConfig.setDefaults(section='labels', language=language)

    yield space + '<div id="facets">'

    selectedFacets = arguments.get('drilldown', [])
    selectedLabel= drilldownConfig.get('limitTo',default='Selected:')

    sortKeys = arguments.get('sortKeys', [''])[0]
    if selectedFacets:
        yield space + '<div class="selected"><div class="heading">%s</div>' % selectedLabel
        for drilldownItem in reversed (selectedFacets):
            fieldName, value = fieldAndTermSplit(drilldownItem)
            drilldownArgs = set(selectedFacets)
            drilldownArgs.remove(drilldownItem)

            label = drilldownConfig.get(fieldName, section = 'fieldNames')

            query = createDrilldownQuery(drilldownArgs, sortKeys)
            term = displayTerm(value, fieldName, language)

            yield displayFilter(query, value, label, term)
        yield space + '</div><!-- close selected -->'

    if total > 0:
        yield displayDrilldownFields(total, docset, drilldownResults, multilevelResults, arguments, language)

    yield space + '</div><!-- close facets -->'