######################################################################
# Copyright (c) 2007, Petteri Aimonen <jpa@kapsi.fi>
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#     * Redistributions of source code must retain the above copyright
#       notice and this list of conditions.
#     * Redistributions in binary form must reproduce the above copyright
#       notice and this list of conditions in the documentation and/or other
#       materials provided with the distribution.

'''Panel for displaying import log (and generic class for other logs)'''

import wx
import wx.html
import events
import re
from dataaccess import get_importlogs

def replacevisited(page, href):
    '''Replace all links with href with visited-colored versions'''
    pattern = '<a href="' + href + '">([^<]+)</a>'
    repl = '<a href="' + href + '"><font color="purple">\\1</font></a>'
    return re.sub(pattern, repl, page)

class LogHtmlWindow(wx.html.HtmlWindow):
    def __init__(self, *args, **kwargs):
        wx.html.HtmlWindow.__init__(self, *args, **kwargs)
        self.SetStandardFonts()
        self.lastlinks = []
        self.currentpage = ''
    
    def SetPage(self, page):
        '''Set page and replace visited links'''
        for href in self.lastlinks:
            page = replacevisited(page, href)
        
        self._SetPage(page)
    
    def _SetPage(self, page, keepscroll = False):
        '''Set page, store to internal variable. If keepscroll is True,
        retain scrollbar position'''
        oldpos = self.GetViewStart()[1]
        self.currentpage = page
        wx.html.HtmlWindow.SetPage(self, page)
        
        if keepscroll:
            self.Scroll(-1, oldpos)
    
    def OnLinkClicked(self, linkinfo):
        '''Send NodeSelectEvent. Node userdata is in event.userdata,
        eg. ('animal', 1234). Link href is parsed as the tuple, splitting
        by ':'. Thus <a href="animal:1234"> results in ('animal', 1234).'''
        
        self.lastlinks.append(linkinfo.GetHref())
        page = replacevisited(self.currentpage, linkinfo.GetHref())
        self._SetPage(page, keepscroll = True)
        
        try:
            level, number = linkinfo.GetHref().split(':')
            number = int(number)
        except (TypeError, ValueError):
            print "Invalid link href:", linkinfo.GetHref()
            return
        
        event = events.NodeSelectEvent()
        event.userdata = (level, number)
        wx.PostEvent(self, event)

class ImportLogPanel(wx.Panel):
    '''Show previous import log from ImportLogger instance'''
    def __init__(self, *args, **kwargs):
        wx.Panel.__init__(self, *args, **kwargs)
        
        self.datechoice = wx.Choice(self)
        self.logwindow = LogHtmlWindow(self, style = wx.BORDER_SUNKEN)
        
        self.sizer = wx.BoxSizer(wx.VERTICAL)
        self.sizer.Add(self.datechoice, flag = wx.ALL | wx.EXPAND, border = 5)
        self.sizer.Add(self.logwindow, flag = wx.ALL | wx.EXPAND,
                       border = 5, proportion = 1)
        
        self.SetAutoLayout(True)
        self.SetSizer(self.sizer)
        self.Layout()
        
        self.logs = {}
        
        self.refresh()
    
        self.datechoice.Bind(wx.EVT_CHOICE, self.render)
    
    def refresh(self, evt = None):
        '''Reload available logs from database and re-render'''
        self.logs = dict(get_importlogs())
        
        choices = self.logs.keys()
        choices.sort()
        
        self.datechoice.Clear()
        for c in choices:
            self.datechoice.Append(c)
        
        # Select newest
        self.datechoice.SetSelection(len(choices) - 1)
        self.render()

    def render(self, evt = None):
        '''(Re-)render selected log'''
        log = self.logs[self.datechoice.GetStringSelection()]
        self.logwindow.SetPage(log)