import email
from urwid import Text
from urwid import Edit
from urwid import Pile
from urwid import Columns
from urwid import AttrMap
from urwid import WidgetWrap
from urwid import ListBox
from urwid import SimpleListWalker
from datetime import datetime

import settings
from helper import shorten
from helper import pretty_datetime


class ThreadlineWidget(AttrMap):
    def __init__(self, tid, dbman):
        self.dbman = dbman
        self.thread = dbman.get_thread(tid)
        self.rebuild()
        AttrMap.__init__(self, self.columns, 'threadline', 'threadline_focus')

    def rebuild(self):
        datestring = pretty_datetime(self.thread.get_newest_date())
        self.date_w = AttrMap(Text(datestring), 'threadline_date')

        mailcountstring = "(%d)" % self.thread.get_total_messages()
        self.mailcount_w = AttrMap(Text(mailcountstring),
                                   'threadline_mailcount')

        tagsstring = " ".join(self.thread.get_tags())
        self.tags_w = AttrMap(Text(tagsstring), 'threadline_tags')

        authors = self.thread.get_authors() or '(None)'
        authorsstring = shorten(authors, settings.authors_maxlength)
        self.authors_w = AttrMap(Text(authorsstring), 'threadline_authors')

        subjectstring = self.thread.get_subject() or ''
        self.subject_w = AttrMap(Text(subjectstring, wrap='clip'),
                                 'threadline_subject')

        self.columns = Columns([
            ('fixed', len(datestring), self.date_w),
            ('fixed', len(mailcountstring), self.mailcount_w),
            ('fixed', len(tagsstring), self.tags_w),
            ('fixed', len(authorsstring), self.authors_w),
            self.subject_w,
            ],
            dividechars=1)
        self.original_widget = self.columns

    def render(self, size, focus=False):
        if focus:
            self.date_w.set_attr_map({None: 'threadline_date_linefocus'})
            self.mailcount_w.set_attr_map({None:
                                           'threadline_mailcount_linefocus'})
            self.tags_w.set_attr_map({None: 'threadline_tags_linefocus'})
            self.authors_w.set_attr_map({None: 'threadline_authors_linefocus'})
            self.subject_w.set_attr_map({None: 'threadline_subject_linefocus'})
        else:
            self.date_w.set_attr_map({None: 'threadline_date'})
            self.mailcount_w.set_attr_map({None: 'threadline_mailcount'})
            self.tags_w.set_attr_map({None: 'threadline_tags'})
            self.authors_w.set_attr_map({None: 'threadline_authors'})
            self.subject_w.set_attr_map({None: 'threadline_subject'})
        return AttrMap.render(self, size, focus)

    def selectable(self):
        return True

    def keypress(self, size, key):
        return key

    def get_thread(self):
        return self.thread


class BufferlineWidget(Text):
    def __init__(self, buffer):
        self.buffer = buffer
        Text.__init__(self, str(buffer), wrap='clip')

    def selectable(self):
        return True

    def keypress(self, size, key):
        return key

    def get_buffer(self):
        return self.buffer


class TagWidget(Text):
    def __init__(self, tag):
        self.tag = tag
        Text.__init__(self, tag, wrap='clip')

    def selectable(self):
        return True

    def keypress(self, size, key):
        return key

    def get_tag(self):
        return self.tag


class PromptWidget(AttrMap):
    def __init__(self, prefix):
        leftpart = Text(prefix, align='left')
        self.editpart = Edit()
        both = Columns(
            [
                ('fixed', len(prefix) + 1, leftpart),
                ('weight', 1, self.editpart),
            ])
        AttrMap.__init__(self, both, 'prompt', 'prompt')

    def set_input(self, txt):
        return self.editpart.set_edit_text(txt)

    def get_input(self):
        return self.editpart.get_edit_text()


class MessageWidget(WidgetWrap):
    def __init__(self, message, even=False, folded=True):
        self.message = message
        if even:
            sumattr = 'messagesummary_even'
        else:
            sumattr = 'messagesummary_odd'

        self.sumw = MessageSummaryWidget(self.message)
        self.headerw = MessageHeaderWidget(self.message.get_email())
        self.bodyw = MessageBodyWidget(self.message.get_email())
        self.displayed_list = [AttrMap(self.sumw, sumattr)]
        if not folded:
            self.displayed_list.append(self.bodyw)
        self.body = Pile(self.displayed_list)
        WidgetWrap.__init__(self, self.body)

    def rebuild(self):
        self.body = Pile(self.displayed_list)
        self._w = self.body

    def toggle_header(self):
        if self.headerw in self.displayed_list:
            self.displayed_list.remove(self.headerw)
        else:
            self.displayed_list.insert(1, self.headerw)
        self.rebuild()

    def toggle_body(self):
        if self.bodyw in self.displayed_list:
            self.displayed_list.remove(self.bodyw)
        else:
            self.displayed_list.append(self.bodyw)
        self.sumw.toggle_folded()
        self.rebuild()

    def selectable(self):
        return True

    def keypress(self, size, key):
        if key == 'h':
            self.toggle_header()
        elif key == 'enter':
            self.toggle_body()
        else:
            return self.body.keypress(size, key)

    def get_message(self):
        return self.message

    def get_email(self):
        return self.message.get_email()


class MessageSummaryWidget(WidgetWrap):
    def __init__(self, message, folded=True):
        self.message = message
        self.folded = folded
        WidgetWrap.__init__(self, Text(str(self)))

    def __str__(self):
        prefix = "-"
        if self.folded:
            prefix = '+'
        return prefix + str(self.message)

    def toggle_folded(self):
        self.folded = not self.folded
        self._w = Text(str(self))

    def selectable(self):
        return True

    def keypress(self, size, key):
        return key


class MessageHeaderWidget(AttrMap):
    def __init__(self, eml):
        self.eml = eml
        headerlines = []
        for line in settings.displayed_headers:
            if line in eml:
                headerlines.append('%s:%s' % (line, eml.get(line)))
        headertxt = '\n'.join(headerlines)
        AttrMap.__init__(self, Text(headertxt), 'message_header')

    def selectable(self):
        return True

    def keypress(self, size, key):
        return key


class MessageBodyWidget(AttrMap):
    def __init__(self, eml):
        self.eml = eml
        bodytxt = ''.join(email.iterators.body_line_iterator(self.eml))
        AttrMap.__init__(self, Text(bodytxt), 'message_body')

    def selectable(self):
        return True

    def keypress(self, size, key):
        return key