# ------------------------------------------------------------------------------
# This file is part of Appy, a framework for building applications in the Python
# language. Copyright (C) 2007 Gaetan Delannay

# Appy 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 3 of the License, or (at your option) any later
# version.

# Appy is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU General Public License for more details.

# You should have received a copy of the GNU General Public License along with
# Appy. If not, see <http://www.gnu.org/licenses/>.

# ------------------------------------------------------------------------------
from appy.fields import Field
from appy.px import Px
from appy.gen.layout import Table

# ------------------------------------------------------------------------------
class Boolean(Field):
    '''Field for storing boolean values.'''

    yesNo = {'true': 'yes', 'false': 'no', True: 'yes', False: 'no'}
    trueFalse = {True: 'true', False: 'false'}

    # Default layout (render = "checkbox") ("b" stands for "base").
    bLayouts = {'view': 'lf', 'edit': Table('f;lrv;=', width=None),
                'search': 'l-f'}
    # Layout including a description.
    dLayouts = {'view': 'lf', 'edit': Table('flrv;=d', width=None)}
    # Centered layout, no description.
    cLayouts = {'view': 'lf|', 'edit': 'flrv|'}
    # Layout for radio buttons (render = "radios")
    rLayouts = {'edit': 'f', 'view': 'f', 'search': 'l-f'}
    rlLayouts = {'edit': 'l-f', 'view': 'lf', 'search': 'l-f'}

    pxView = pxCell = Px('''<x>:value</x>
     <input type="hidden" if="masterCss"
            class=":masterCss" value=":rawValue" name=":name" id=":name"/>''')

    pxEdit = Px('''<x var="isTrue=field.isTrue(zobj, rawValue)">
     <x if="field.render == 'checkbox'">
      <input type="checkbox" name=":name + '_visible'" id=":name"
             class=":masterCss" checked=":isTrue"
             onclick=":'toggleCheckbox(%s, %s); %s' % (q(name), \
                       q('%s_hidden' % name), \
                       field.getOnChange(zobj, layoutType))"/>
      <input type="hidden" name=":name" id=":'%s_hidden' % name"
             value=":isTrue and 'True' or 'False'"/>
     </x>
     <x if="field.render == 'radios'"
        var2="falseId='%s_false' % name;
              trueId='%s_true' % name">
      <input type="radio" name=":name" id=":falseId" class=":masterCss"
             value="False" checked=":not isTrue"/>
      <label lfor=":falseId">:_(field.labelId + '_false')</label><br/>
      <input type="radio" name=":name" id=":trueId" class=":masterCss"
             value="True" checked=":isTrue"/>
      <label lfor=":trueId">:_(field.labelId + '_true')</label>
     </x></x>''')

    pxSearch = Px('''<x var="typedWidget='%s*bool' % widgetName">
      <x var="valueId='%s_yes' % name">
       <input type="radio" value="True" name=":typedWidget" id=":valueId"/>
       <label lfor=":valueId">:_(field.getValueLabel(True))</label>
      </x>
      <x var="valueId='%s_no' % name">
       <input type="radio" value="False" name=":typedWidget" id=":valueId"/>
       <label lfor=":valueId">:_(field.getValueLabel(False))</label>
      </x>
      <x var="valueId='%s_whatever' % name">
       <input type="radio" value="" name=":typedWidget" id=":valueId"
              checked="checked"/>
       <label lfor=":valueId">:_('whatever')</label>
      </x><br/></x>''')

    def __init__(self, validator=None, multiplicity=(0,1), default=None,
                 show=True, page='main', group=None, layouts = None, move=0,
                 indexed=False, searchable=False, specificReadPermission=False,
                 specificWritePermission=False, width=None, height=None,
                 maxChars=None, colspan=1, master=None, masterValue=None,
                 focus=False, historized=False, mapping=None, label=None,
                 sdefault=False, scolspan=1, swidth=None, sheight=None,
                 persist=True, render='checkbox'):
        # By default, a boolean is edited via a checkbox. It can also be edited
        # via 2 radio buttons (p_render="radios").
        self.render = render
        Field.__init__(self, validator, multiplicity, default, show, page,
                       group, layouts, move, indexed, searchable,
                       specificReadPermission, specificWritePermission, width,
                       height, None, colspan, master, masterValue, focus,
                       historized, mapping, label, sdefault, scolspan, swidth,
                       sheight, persist)
        self.pythonType = bool

    def getDefaultLayouts(self):
        return (self.render == 'radios') and self.rLayouts or self.bLayouts

    def getValue(self, obj):
        '''Never returns "None". Returns always "True" or "False", even if
           "None" is stored in the DB.'''
        value = Field.getValue(self, obj)
        if value == None: return False
        return value

    def getValueLabel(self, value):
        '''Returns the label for p_value (True or False): if self.render is
           "checkbox", the label is simply the translated version of "yes" or
           "no"; if self.render is "radios", there are specific labels.'''
        if self.render == 'radios':
            return '%s_%s' % (self.labelId, self.trueFalse[value])
        return self.yesNo[value]

    def getFormattedValue(self, obj, value, showChanges=False):
        return obj.translate(self.getValueLabel(value))

    def getStorableValue(self, value):
        if not self.isEmptyValue(value):
            exec 'res = %s' % value
            return res

    def isTrue(self, obj, dbValue):
        '''When rendering this field as a checkbox, must it be checked or
           not?'''
        rq = obj.REQUEST
        # Get the value we must compare (from request or from database)
        if rq.has_key(self.name):
            return rq.get(self.name) in ('True', 1, '1')
        return dbValue
# ------------------------------------------------------------------------------