class Form():
    def __init__(self, action=None, cls='form', title=None, onsubmit=None, name=None, message='', method="get"):
        """Note that there appears to be a bug in cherrypy whereby
        forms submitted via post don't have their fields included in
        kwargs for the default index method.  So we use get by
        default, though it's not as neat."""

        action = self.get_form_attrib_text('action', action)
        onsubmit = self.get_form_attrib_text('onsubmit', onsubmit)
        name = self.get_form_attrib_text('name', name)

        self.pretext = '           <form class="%s" method="%s" %s%s%s>\n' % (cls, method, action, onsubmit, name)
        if title:
            self.pretext += '             <h2>%s</h2>\n' % title

        if message:
            self.message = "<h3>%s</h3>" % message
        else:
            self.message = ''
        self.text = ''
        self.end_text = "</form>\n"
    def get_form_attrib_text(self, field, val):
        if val:
            return ' %s="%s"' % (field, val)
        else:
            return ''
    def html(self, html):
        self.text += html
    def dropdown(self, label='', name=None, id=None, vals=None, select=None, onchange=''):
        """vals is a list of values.
        select is the index in vals of the selected item.  None means no item is selected yet."""
        name, id = self.name_or_id(name, id)
        self.text += ("""             <label>
                <span>%(label)s</span>
                <select name="%(name)s" id="%(id)s" onchange="%(onchange)s">\n""" 
                      % {'label':label, 'name':name, 'id':id, 'onchange':onchange})
        for i in range(len(vals)):
            v = vals[i]
            if i == select:
                selected = "SELECTED"
            else:
                selected = ''
            self.text +="                   <option value=\"%s\" %s>%s</option>\n" % (v, selected, v)
        self.text += """                </select>
             </label>\n"""

    def dotted_quad(self, label='', name=None, id=None, quad=None):
        name, id = self.name_or_id(name, id)
        if not quad:
            quad = [0,0,0,0]
        self.text += """             <label>
                <span>%(label)s</span>
                <input type="text" class="inputtextnowidth" name="%(name)s0" id="%(id)s0" value="%(q0)s" maxlength="3" size="1"/><strong>.</strong>
                <input type="text" class="inputtextnowidth" name="%(name)s1" id="%(id)s1" value="%(q1)s" maxlength="3" size="1"/><strong>.</strong>
                <input type="text" class="inputtextnowidth" name="%(name)s2" id="%(id)s2" value="%(q2)s" maxlength="3" size="1"/><strong>.</strong>
                <input type="text" class="inputtextnowidth" name="%(name)s3" id="%(id)s3" value="%(q3)s" maxlength="3" size="1"/>
             </label>""" % {'label':label, 'name':name, 'id':id, 'q0':quad[0], 'q1':quad[1], 'q2':quad[2], 'q3':quad[3]}

    def text_input(self, label='', name=None, id=None, type='text', value='', size=20):
        name, id = self.name_or_id(name, id)
        if type=="hidden":
            self.text += '<input type="%s" class="inputtext" name="%s" id="%s" value="%s"/>' % (type, name, id, value)
        else:
            self.text += """             <label>
                <span>%s</span>
                <input type="%s" class="inputtext" name="%s" id="%s" value="%s" size="%s"/>
             </label>""" % (label, type, name, id, value, size)
    def text_box(self, label='', name=None, id=None):
        name, id = self.name_or_id(name, id)
        self.text += """
             <label>
                 <span>%s</span>
                 <textarea class="textbox" name="%s" id="%s"></textarea>
             </label>""" % (label, name, id)
    def submit(self, label='', name=None, id=None):
        name, id = self.name_or_id(name, id)
        self.text += """
             <div class="submit">
             <label><span></span>
                 <input type="submit" class="btn-primary" value="%s" name="%s" id="%s" />
             </label></div>\n""" % (label, name, id)
    def submit_row(self, buttons):
        """buttons is a list of tuples, each containing label, name, id.  Name and id are optional."""
        self.text += '<div class="submit"><label>'
        button_text = ''
        for button in buttons:
            label = button[0]
            try:
                name = button[1]
            except:
                name = None

            try:
                id = button[2]
            except:
                id = None

            name, id = self.name_or_id(name, id)

            if button_text != '':
                button_text += "&nbsp;"
            button_text += '<input type="submit" class="btn-primary" value="%s" name="%s" id="%s" />\n' % (label, name, id)
        self.text += '%s</div></label>' % button_text
    def name_or_id(self, name, id):
        if not name: name = id
        if not id: id = name
        if not name: name = ''
        if not id: id = ''
        return name, id
    def checkbox(self, label='', name='', id='', checked=''): 
        name, id = self.name_or_id(name, id)
        if checked:
            checked = 'checked="on"'
        self.text += """
             <div class="checkbox">
             <label>
                <span>%s</span>
                <input type=checkbox name="%s" id="%s" %s/>
             </label></div>\n""" % (label, name, id, checked)
    def get_checkbox(self, name='', id=''):
        return '<input type=checkbox name="%s" id="%s" />\n' % self.name_or_id(name, id)
    def render(self):
        return self.pretext+self.message+self.text+self.end_text