# Copyright (C) 1998-2007 by the Free Software Foundation, Inc.
#
# 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.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
# USA.

"""Library for program-based construction of an HTML documents.

Encapsulate HTML formatting directives in classes that act as containers
for python and, recursively, for nested HTML formatting objects.
"""

from Mailman import Defaults
from Mailman import Utils
from Mailman import Version
from Mailman.configuration import config
from Mailman.i18n import _

SPACE = ' '
EMPTYSTRING = ''
NL = '\n'



# Format an arbitrary object.
def HTMLFormatObject(item, indent):
    "Return a presentation of an object, invoking their Format method if any."
    if hasattr(item, 'Format'):
        return item.Format(indent)
    if isinstance(item, basestring):
        return item
    return str(item)

def CaseInsensitiveKeyedDict(d):
    result = {}
    for (k,v) in d.items():
        result[k.lower()] = v
    return result

# Given references to two dictionaries, copy the second dictionary into the
# first one.
def DictMerge(destination, fresh_dict):
    for (key, value) in fresh_dict.items():
        destination[key] = value

class Table:
    def __init__(self, **table_opts):
        self.cells = []
        self.cell_info = {}
        self.row_info = {}
        self.opts = table_opts

    def AddOptions(self, opts):
        DictMerge(self.opts, opts)

    # Sets all of the cells.  It writes over whatever cells you had there
    # previously.

    def SetAllCells(self, cells):
        self.cells = cells

    # Add a new blank row at the end
    def NewRow(self):
        self.cells.append([])

    # Add a new blank cell at the end
    def NewCell(self):
        self.cells[-1].append('')

    def AddRow(self, row):
        self.cells.append(row)

    def AddCell(self, cell):
        self.cells[-1].append(cell)

    def AddCellInfo(self, row, col, **kws):
        kws = CaseInsensitiveKeyedDict(kws)
        if not self.cell_info.has_key(row):
            self.cell_info[row] = { col : kws }
        elif self.cell_info[row].has_key(col):
            DictMerge(self.cell_info[row], kws)
        else:
            self.cell_info[row][col] = kws

    def AddRowInfo(self, row, **kws):
        kws = CaseInsensitiveKeyedDict(kws)
        if not self.row_info.has_key(row):
            self.row_info[row] = kws
        else:
            DictMerge(self.row_info[row], kws)

    # What's the index for the row we just put in?
    def GetCurrentRowIndex(self):
        return len(self.cells)-1

    # What's the index for the col we just put in?
    def GetCurrentCellIndex(self):
        return len(self.cells[-1])-1

    def ExtractCellInfo(self, info):
        valid_mods = ['align', 'valign', 'nowrap', 'rowspan', 'colspan',
                      'bgcolor']
        output = ''

        for (key, val) in info.items():
            if not key in valid_mods:
                continue
            if key == 'nowrap':
                output = output + ' NOWRAP'
                continue
            else:
                output = output + ' %s="%s"' % (key.upper(), val)

        return output

    def ExtractRowInfo(self, info):
        valid_mods = ['align', 'valign', 'bgcolor']
        output = ''

        for (key, val) in info.items():
            if not key in valid_mods:
                continue
            output = output + ' %s="%s"' % (key.upper(), val)

        return output

    def ExtractTableInfo(self, info):
        valid_mods = ['align', 'width', 'border', 'cellspacing', 'cellpadding',
                      'bgcolor']

        output = ''

        for (key, val) in info.items():
            if not key in valid_mods:
                continue
            if key == 'border' and val == None:
                output = output + ' BORDER'
                continue
            else:
                output = output + ' %s="%s"' % (key.upper(), val)

        return output

    def FormatCell(self, row, col, indent):
        try:
            my_info = self.cell_info[row][col]
        except:
            my_info = None

        output = '\n' + ' '*indent + '<td'
        if my_info:
            output = output + self.ExtractCellInfo(my_info)
        item = self.cells[row][col]
        item_format = HTMLFormatObject(item, indent+4)
        output = '%s>%s</td>' % (output, item_format)
        return output

    def FormatRow(self, row, indent):
        try:
            my_info = self.row_info[row]
        except:
            my_info = None

        output = '\n' + ' '*indent + '<tr'
        if my_info:
            output = output + self.ExtractRowInfo(my_info)
        output = output + '>'

        for i in range(len(self.cells[row])):
            output = output + self.FormatCell(row, i, indent + 2)

        output = output + '\n' + ' '*indent + '</tr>'

        return output

    def Format(self, indent=0):
        output = '\n' + ' '*indent + '<table'
        output = output + self.ExtractTableInfo(self.opts)
        output = output + '>'

        for i in range(len(self.cells)):
            output = output + self.FormatRow(i, indent + 2)

        output = output + '\n' + ' '*indent + '</table>\n'

        return output


class Link:
    def __init__(self, href, text, target=None):
        self.href = href
        self.text = text
        self.target = target

    def Format(self, indent=0):
        texpr = ""
        if self.target != None:
            texpr = ' target="%s"' % self.target
        return '<a href="%s"%s>%s</a>' % (HTMLFormatObject(self.href, indent),
                                          texpr,
                                          HTMLFormatObject(self.text, indent))

class FontSize:
    """FontSize is being deprecated - use FontAttr(..., size="...") instead."""
    def __init__(self, size, *items):
        self.items = list(items)
        self.size = size

    def Format(self, indent=0):
        output = '<font size="%s">' % self.size
        for item in self.items:
            output = output + HTMLFormatObject(item, indent)
        output = output + '</font>'
        return output

class FontAttr:
    """Present arbitrary font attributes."""
    def __init__(self, *items, **kw):
        self.items = list(items)
        self.attrs = kw

    def Format(self, indent=0):
        seq = []
        for k, v in self.attrs.items():
            seq.append('%s="%s"' % (k, v))
        output = '<font %s>' % SPACE.join(seq)
        for item in self.items:
            output = output + HTMLFormatObject(item, indent)
        output = output + '</font>'
        return output


class Container:
    def __init__(self, *items):
        if not items:
            self.items = []
        else:
            self.items = items

    def AddItem(self, obj):
        self.items.append(obj)

    def Format(self, indent=0):
        output = []
        for item in self.items:
            output.append(HTMLFormatObject(item, indent))
        return EMPTYSTRING.join(output)


class Label(Container):
    align = 'right'

    def __init__(self, *items):
        Container.__init__(self, *items)

    def Format(self, indent=0):
        return ('<div align="%s">' % self.align) + \
               Container.Format(self, indent) + \
               '</div>'


# My own standard document template.  YMMV.
# something more abstract would be more work to use...

class Document(Container):
    title = None
    language = None
    bgcolor = Defaults.WEB_BG_COLOR
    suppress_head = 0

    def set_language(self, lang=None):
        self.language = lang

    def set_bgcolor(self, color):
        self.bgcolor = color

    def SetTitle(self, title):
        self.title = title

    def Format(self, indent=0, **kws):
        charset = 'us-ascii'
        if self.language:
            charset = Utils.GetCharSet(self.language)
        output = ['Content-Type: text/html; charset=%s\n' % charset]
        if not self.suppress_head:
            kws.setdefault('bgcolor', self.bgcolor)
            tab = ' ' * indent
            output.extend([tab,
                           '<HTML>',
                           '<HEAD>'
                           ])
            if config.IMAGE_LOGOS:
                output.append('<LINK REL="SHORTCUT ICON" HREF="%s">' %
                              (config.IMAGE_LOGOS + config.SHORTCUT_ICON))
            # Hit all the bases
            output.append('<META http-equiv="Content-Type" '
                          'content="text/html; charset=%s">' % charset)
            if self.title:
                output.append('%s<TITLE>%s</TITLE>' % (tab, self.title))
            output.append('%s</HEAD>' % tab)
            quals = []
            # Default link colors
            if config.WEB_VLINK_COLOR:
                kws.setdefault('vlink', config.WEB_VLINK_COLOR)
            if config.WEB_ALINK_COLOR:
                kws.setdefault('alink', config.WEB_ALINK_COLOR)
            if config.WEB_LINK_COLOR:
                kws.setdefault('link', config.WEB_LINK_COLOR)
            for k, v in kws.items():
                quals.append('%s="%s"' % (k, v))
            output.append('%s<BODY %s>' % (tab, SPACE.join(quals)))
        # Always do this...
        output.append(Container.Format(self, indent))
        if not self.suppress_head:
            output.append('%s</BODY>' % tab)
            output.append('%s</HTML>' % tab)
        return NL.join(output)

    def addError(self, errmsg, tag=None):
        if tag is None:
            tag = _('Error: ')
        self.AddItem(Header(3, Bold(FontAttr(
            _(tag), color=config.WEB_ERROR_COLOR, size='+2')).Format() +
                            Italic(errmsg).Format()))


class HeadlessDocument(Document):
    """Document without head section, for templates that provide their own."""
    suppress_head = 1


class StdContainer(Container):
    def Format(self, indent=0):
        # If I don't start a new I ignore indent
        output = '<%s>' % self.tag
        output = output + Container.Format(self, indent)
        output = '%s</%s>' % (output, self.tag)
        return output


class QuotedContainer(Container):
    def Format(self, indent=0):
        # If I don't start a new I ignore indent
        output = '<%s>%s</%s>' % (
            self.tag,
            Utils.websafe(Container.Format(self, indent)),
            self.tag)
        return output

class Header(StdContainer):
    def __init__(self, num, *items):
        self.items = items
        self.tag = 'h%d' % num

class Address(StdContainer):
    tag = 'address'

class Underline(StdContainer):
    tag = 'u'

class Bold(StdContainer):
    tag = 'strong'

class Italic(StdContainer):
    tag = 'em'

class Preformatted(QuotedContainer):
    tag = 'pre'

class Subscript(StdContainer):
    tag = 'sub'

class Superscript(StdContainer):
    tag = 'sup'

class Strikeout(StdContainer):
    tag = 'strike'

class Center(StdContainer):
    tag = 'center'

class Form(Container):
    def __init__(self, action='', method='POST', encoding=None, *items):
        apply(Container.__init__, (self,) +  items)
        self.action = action
        self.method = method
        self.encoding = encoding

    def set_action(self, action):
        self.action = action

    def Format(self, indent=0):
        spaces = ' ' * indent
        encoding = ''
        if self.encoding:
            encoding = 'enctype="%s"' % self.encoding
        output = '\n%s<FORM action="%s" method="%s" %s>\n' % (
            spaces, self.action, self.method, encoding)
        output = output + Container.Format(self, indent+2)
        output = '%s\n%s</FORM>\n' % (output, spaces)
        return output


class InputObj:
    def __init__(self, name, ty, value, checked, **kws):
        self.name = name
        self.type = ty
        self.value = value
        self.checked = checked
        self.kws = kws

    def Format(self, indent=0):
        output = ['<INPUT name="%s" type="%s" value="%s"' %
                  (self.name, self.type, self.value)]
        for item in self.kws.items():
            output.append('%s="%s"' % item)
        if self.checked:
            output.append('CHECKED')
        output.append('>')
        return SPACE.join(output)


class SubmitButton(InputObj):
    def __init__(self, name, button_text):
        InputObj.__init__(self, name, "SUBMIT", button_text, checked=0)

class PasswordBox(InputObj):
    def __init__(self, name, value='', size=Defaults.TEXTFIELDWIDTH):
        InputObj.__init__(self, name, "PASSWORD", value, checked=0, size=size)

class TextBox(InputObj):
    def __init__(self, name, value='', size=Defaults.TEXTFIELDWIDTH):
        InputObj.__init__(self, name, "TEXT", value, checked=0, size=size)

class Hidden(InputObj):
    def __init__(self, name, value=''):
        InputObj.__init__(self, name, 'HIDDEN', value, checked=0)

class TextArea:
    def __init__(self, name, text='', rows=None, cols=None, wrap='soft',
                 readonly=0):
        self.name = name
        self.text = text
        self.rows = rows
        self.cols = cols
        self.wrap = wrap
        self.readonly = readonly

    def Format(self, indent=0):
        output = '<TEXTAREA NAME=%s' % self.name
        if self.rows:
            output += ' ROWS=%s' % self.rows
        if self.cols:
            output += ' COLS=%s' % self.cols
        if self.wrap:
            output += ' WRAP=%s' % self.wrap
        if self.readonly:
            output += ' READONLY'
        output += '>%s</TEXTAREA>' % self.text
        return output

class FileUpload(InputObj):
    def __init__(self, name, rows=None, cols=None, **kws):
        apply(InputObj.__init__, (self, name, 'FILE', '', 0), kws)

class RadioButton(InputObj):
    def __init__(self, name, value, checked=0, **kws):
        apply(InputObj.__init__, (self, name, 'RADIO', value, checked), kws)

class CheckBox(InputObj):
    def __init__(self, name, value, checked=0, **kws):
        apply(InputObj.__init__, (self, name, "CHECKBOX", value, checked), kws)

class VerticalSpacer:
    def __init__(self, size=10):
        self.size = size
    def Format(self, indent=0):
        output = '<spacer type="vertical" height="%d">' % self.size
        return output

class WidgetArray:
    Widget = None

    def __init__(self, name, button_names, checked, horizontal, values):
        self.name = name
        self.button_names = button_names
        self.checked = checked
        self.horizontal = horizontal
        self.values = values
        assert len(values) == len(button_names)
        # Don't assert `checked' because for RadioButtons it is a scalar while
        # for CheckedBoxes it is a vector.  Subclasses will assert length.

    def ischecked(self, i):
        raise NotImplemented

    def Format(self, indent=0):
        t = Table(cellspacing=5)
        items = []
        for i, name, value in zip(range(len(self.button_names)),
                                  self.button_names,
                                  self.values):
            ischecked = (self.ischecked(i))
            item = self.Widget(self.name, value, ischecked).Format() + name
            items.append(item)
            if not self.horizontal:
                t.AddRow(items)
                items = []
        if self.horizontal:
            t.AddRow(items)
        return t.Format(indent)

class RadioButtonArray(WidgetArray):
    Widget = RadioButton

    def __init__(self, name, button_names, checked=None, horizontal=1,
                 values=None):
        if values is None:
            values = range(len(button_names))
        # BAW: assert checked is a scalar...
        WidgetArray.__init__(self, name, button_names, checked, horizontal,
                             values)

    def ischecked(self, i):
        return self.checked == i

class CheckBoxArray(WidgetArray):
    Widget = CheckBox

    def __init__(self, name, button_names, checked=None, horizontal=0,
                 values=None):
        if checked is None:
            checked = [0] * len(button_names)
        else:
            assert len(checked) == len(button_names)
        if values is None:
            values = range(len(button_names))
        WidgetArray.__init__(self, name, button_names, checked, horizontal,
                             values)

    def ischecked(self, i):
        return self.checked[i]

class UnorderedList(Container):
    def Format(self, indent=0):
        spaces = ' ' * indent
        output = '\n%s<ul>\n' % spaces
        for item in self.items:
            output = output + '%s<li>%s\n' % \
                     (spaces, HTMLFormatObject(item, indent + 2))
        output = output + '%s</ul>\n' % spaces
        return output

class OrderedList(Container):
    def Format(self, indent=0):
        spaces = ' ' * indent
        output = '\n%s<ol>\n' % spaces
        for item in self.items:
            output = output + '%s<li>%s\n' % \
                     (spaces, HTMLFormatObject(item, indent + 2))
        output = output + '%s</ol>\n' % spaces
        return output

class DefinitionList(Container):
    def Format(self, indent=0):
        spaces = ' ' * indent
        output = '\n%s<dl>\n' % spaces
        for dt, dd in self.items:
            output = output + '%s<dt>%s\n<dd>%s\n' % \
                     (spaces, HTMLFormatObject(dt, indent+2),
                      HTMLFormatObject(dd, indent+2))
        output = output + '%s</dl>\n' % spaces
        return output



# Logo constants
#
# These are the URLs which the image logos link to.  The Mailman home page now
# points at the gnu.org site instead of the www.list.org mirror.

PYTHON_URL  = 'http://www.python.org/'
GNU_URL     = 'http://www.gnu.org/'

# The names of the image logo files.  These are concatentated onto
# config.IMAGE_LOGOS (not urljoined).
DELIVERED_BY = 'mailman.jpg'
PYTHON_POWERED = 'PythonPowered.png'
GNU_HEAD = 'gnu-head-tiny.jpg'


def MailmanLogo():
    t = Table(border=0, width='100%')
    if config.IMAGE_LOGOS:
        def logo(file):
            return config.IMAGE_LOGOS + file
        mmlink = '<img src="%s" alt="Delivered by Mailman" border=0>' \
                 '<br>version %s' % (logo(DELIVERED_BY), Version.VERSION)
        pylink = '<img src="%s" alt="Python Powered" border=0>' % \
                 logo(PYTHON_POWERED)
        gnulink = '<img src="%s" alt="GNU\'s Not Unix" border=0>' % \
                  logo(GNU_HEAD)
        t.AddRow([mmlink, pylink, gnulink])
    else:
        # use only textual links
        version = Version.VERSION
        mmlink = Link(config.MAILMAN_URL,
                      _('Delivered by Mailman<br>version %(version)s'))
        pylink = Link(PYTHON_URL, _('Python Powered'))
        gnulink = Link(GNU_URL, _("Gnu's Not Unix"))
        t.AddRow([mmlink, pylink, gnulink])
    return t


class SelectOptions:
   def __init__(self, varname, values, legend,
                selected=0, size=1, multiple=None):
      self.varname  = varname
      self.values   = values
      self.legend   = legend
      self.size     = size
      self.multiple = multiple
      # we convert any type to tuple, commas are needed
      if not multiple:
         if isinstance(selected, int):
             self.selected = (selected,)
         elif isinstance(selected, tuple):
             self.selected = (selected[0],)
         elif isinstance(selected, list):
             self.selected = (selected[0],)
         else:
             self.selected = (0,)

   def Format(self, indent=0):
      spaces = " " * indent
      items  = min( len(self.values), len(self.legend) )

      # jcrey: If there is no argument, we return nothing to avoid errors
      if items == 0:
          return ""

      text = "\n" + spaces + "<Select name=\"%s\"" % self.varname
      if self.size > 1:
          text = text + " size=%d" % self.size
      if self.multiple:
          text = text + " multiple"
      text = text + ">\n"

      for i in range(items):
          if i in self.selected:
              checked = " Selected"
          else:
              checked = ""

          opt = " <option value=\"%s\"%s> %s </option>" % (
              self.values[i], checked, self.legend[i])
          text = text + spaces + opt + "\n"

      return text + spaces + '</Select>'