"""
    MoinMoin edit log class

    @license: GNU GPL, see COPYING for details.
"""

import os.path
from logfile import LogFile
from MoinMoin import wikiutil, user, config
from MoinMoin.Page import Page

class EditLogLine:
    """
    Has the following attributes

    ed_time_usecs
    rev
    action
    pagename
    addr
    hostname
    userid
    extra
    comment
    """
    def __init__(self, usercache):
        self._usercache = usercache

    def __cmp__(self, other):
        try:
            return cmp(self.ed_time_usecs, other.ed_time_usecs)
        except AttributeError:
            return cmp(self.ed_time_usecs, other)

    def is_from_current_user(self, request):
        user = request.user
        if user.id: return user.id==self.userid
        return request.remote_addr==self.addr        

    def getEditorData(self, request):
        """ Return a tuple of type id and string or Page object
            representing the user that did the edit.

            DEPRECATED - try to use getInterwikiEditorData
            NOT USED ANY MORE BY MOIN CODE!

            The type id is one of 'ip' (DNS or numeric IP), 'user' (user name)
            or 'homepage' (Page instance of user's homepage).
        """
        result = 'ip', request.cfg.show_hosts and self.hostname or ''
        if self.userid:
            if not self._usercache.has_key(self.userid):
                self._usercache[self.userid] = user.User(request, self.userid, auth_method="editlog:53")
            userdata = self._usercache[self.userid]
            if userdata.name:
                pg = wikiutil.getHomePage(request, username=userdata.name)
                if pg:
                    result = ('homepage', pg)
                else:
                    result = ('user', userdata.name)

        return result


    def getInterwikiEditorData(self, request):
        """ Return a tuple of type id and string or Page object
            representing the user that did the edit.

            The type id is one of 'ip' (DNS or numeric IP), 'user' (user name)
            or 'homepage' (Page instance of user's homepage).
        """
        result = 'ip', request.cfg.show_hosts and self.hostname or ''
        if self.userid:
            if not self._usercache.has_key(self.userid):
                self._usercache[self.userid] = user.User(request, self.userid, auth_method="editlog:75")
            userdata = self._usercache[self.userid]
            if userdata.mailto_author and userdata.email:
                return ('email', userdata.email)
            elif userdata.name:
                interwiki = wikiutil.getInterwikiHomePage(request, username=userdata.name)
                if interwiki:
                    result = ('interwiki', interwiki)
        return result


    def getEditor(self, request):
        """ Return a HTML-safe string representing the user that did the edit.
        """
        if request.cfg.show_hosts:
            title = " @ %s[%s]" % (self.hostname, self.addr)
        else:
            title = ""
        kind, info = self.getInterwikiEditorData(request)
        if kind == 'interwiki':
            name = self._usercache[self.userid].name
            aliasname = self._usercache[self.userid].aliasname
            if not aliasname:
                aliasname = name
            title = wikiutil.escape(aliasname + title)
            text = (request.formatter.interwikilink(1, title=title, *info) +
                    request.formatter.text(name) +
                    request.formatter.interwikilink(0, title=title, *info))
        elif kind == 'email':
            name = self._usercache[self.userid].name
            aliasname = self._usercache[self.userid].aliasname
            if not aliasname:
                aliasname = name
            title = wikiutil.escape(aliasname + title)
            url = 'mailto:%s' % info
            text = (request.formatter.url(1, url, css='mailto', title=title) +
                    request.formatter.text(name) +
                    request.formatter.url(0))
        elif kind == 'ip':
            idx = info.find('.')
            if idx==-1:
                idx = len(info)
            title = wikiutil.escape('???' + title)
            text = wikiutil.escape(info[:idx])
        else:
            raise "unknown EditorData type"
        return '<span title="%s">%s</span>' % (title, text)


class EditLog(LogFile):

    def __init__(self, request, filename=None, buffer_size=65536, **kw):
        if filename == None:
            rootpagename = kw.get('rootpagename', None)
            if rootpagename:
                filename = Page(request, rootpagename).getPagePath('edit-log', isfile=1)
            else:
                filename = request.rootpage.getPagePath('edit-log', isfile=1)
        LogFile.__init__(self, filename, buffer_size)
        self._NUM_FIELDS = 9
        self._usercache = {}
        
        # Used by antispam in order to show an internal name instead
        # of a confusing userid
        self.uid_override = kw.get('uid_override', None)

    def add(self, request, mtime, rev, action, pagename, host=None, extra=u'', comment=u''):
            """ Generate a line for the editlog.
    
            If `host` is None, it's read from request vars.
            """
            if host is None:
                host = request.remote_addr

            if request.cfg.log_reverse_dns_lookups:
                import socket
                try:
                    hostname = socket.gethostbyaddr(host)[0]
                    hostname = unicode(hostname, config.charset)
                except (socket.error, UnicodeError), err:
                    hostname = host
            else:
                hostname = host
            
            remap_chars = {u'\t': u' ', u'\r': u' ', u'\n': u' ',}
            comment = comment.translate(remap_chars)
            user_id = request.user.valid and request.user.id or ''

            if self.uid_override != None:
                user_id = ''
                hostname = self.uid_override
                host = ''
            
            line = u"\t".join((str(long(mtime)), # has to be long for py 2.2.x
                               "%08d" % rev,
                               action,
                               wikiutil.quoteWikinameFS(pagename),
                               host,
                               hostname,
                               user_id,
                               extra,
                               comment,
                               )) + "\n"
            self._add(line)

    def parser(self, line):
        """ Parser edit log line into fields """
        fields = line.strip().split('\t')
        # Pad empty fields
        missing = self._NUM_FIELDS - len(fields)
        if missing:
            fields.extend([''] * missing)
        result = EditLogLine(self._usercache)
        (result.ed_time_usecs, result.rev, result.action,
         result.pagename, result.addr, result.hostname, result.userid,
         result.extra, result.comment,) = fields[:self._NUM_FIELDS]
        if not result.hostname:
            result.hostname = result.addr
        result.pagename = wikiutil.unquoteWikiname(result.pagename.encode('ascii'))
        result.ed_time_usecs = long(result.ed_time_usecs or '0') # has to be long for py 2.2.x
        return result
    
    def set_filter(self, **kw):
        expr = "1"
        for field in ['pagename', 'addr', 'hostname', 'userid']:
            if kw.has_key(field):
                expr = "%s and x.%s == %s" % (expr, field, `kw[field]`)
                
        if kw.has_key('ed_time_usecs'):
            expr = "%s and long(x.ed_time_usecs) == %s" % (expr, long(kw['ed_time_usecs'])) # must be long for py 2.2.x

        self.filter = eval("lambda x: " + expr)
    

