#!/usr/bin/env python

###
# Copyright (c) 2003, Daniel Berlin
# Based on code from kibot
# All rights reserved.
#
# 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,
#     this list of conditions, and the following disclaimer.
#   * Redistributions in binary form must reproduce the above copyright notice,
#     this list of conditions, and the following disclaimer in the
#     documentation and/or other materials provided with the distribution.
#   * Neither the name of the author of this software nor the name of
#     contributors to this software may be used to endorse or promote products
#     derived from this software without specific prior written consent.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
###

"""
Bugzilla bug retriever
"""

import os
import re
import string
import urllib
import base64
import xml.dom.minidom as minidom
from htmlentitydefs import entitydefs as entities

import sqlite

import conf
import utils
import plugins
import privmsgs
import callbacks
import ircutils

dbfilename = os.path.join(conf.dataDir, 'Bugzilla.db')
def makeDb(filename):
    if os.path.exists(filename):
        return sqlite.connect(filename)
    db = sqlite.connect(filename)
    cursor = db.cursor()
    cursor.execute("""CREATE TABLE bugzillas (
                      shorthand TEXT UNIQUE ON CONFLICT REPLACE,
                      url TEXT,
                      description TEXT
                      )""")
    cursor = db.cursor();
    cursor.execute("""INSERT INTO bugzillas VALUES (%s, %s, %s)""",
                    'rh', 'http://bugzilla.redhat.com/bugzilla', 'Red Hat')
    cursor.execute("""INSERT INTO bugzillas VALUES (%s, %s, %s)""",
                    'gnome', 'http://bugzilla.gnome.org', 'Gnome')
    cursor.execute("""INSERT INTO bugzillas VALUES (%s, %s, %s)""",
                    'xim', 'http://bugzilla.ximian.com', 'Ximian')
    cursor.execute("""INSERT INTO bugzillas VALUES (%s, %s, %s)""",
                    'moz', 'http://bugzilla.mozilla.org', 'Mozilla')
    cursor.execute("""INSERT INTO bugzillas VALUES (%s, %s, %s)""",
                    'gcc', 'http://gcc.gnu.org/bugzilla', 'GCC')
    db.commit()
    return db

class BugError(Exception):
    """A bugzilla error"""
    pass

def configure(onStart, afterConnect, advanced):
    from questions import expect, anything, yn
    onStart.append('load Bugzilla')
    if advanced:
        print 'The Bugzilla plugin has the functionality to watch for URLs'
        print 'that match a specific pattern (we call this a snarfer). When'
        print 'supybot sees such a URL, he will parse the web page for'
        print 'information and reply with the results.\n'
        if yn('Do you want the Bugzilla snarfer enabled by default?') == 'n':
            onStart.append('Bugzilla config bug-snarfer off')

class Bugzilla(callbacks.PrivmsgCommandAndRegexp, plugins.Configurable):
    """Show a link to a bug report with a brief description"""
    threaded = True
    regexps = ['bzSnarfer']
    configurables = plugins.ConfigurableDictionary(
        [('bug-snarfer', plugins.ConfigurableTypes.bool, True,
         """Determines whether the bug snarfer will be enabled, such that any
         Bugzilla URLs seen in the channel will have their information reported
         into the channel.""")]
    )
    def __init__(self):
        callbacks.PrivmsgCommandAndRegexp.__init__(self)
        self.entre = re.compile('&(\S*?);')
        self.db = makeDb(dbfilename)

    def die(self):
        self.db.close()
        del self.db
    
    def add(self, irc, msg, args):
        """<abbreviation> <url> <description>

        Add a bugzilla <url> to the list of defined bugzillae. <abbreviation>
        is the name that will be used to reference the zilla in all other
        commands. <description> is the common name for the bugzilla and will
        be listed with the bugzilla query.
        """
        (shorthand, url, description) = privmsgs.getArgs(args, needed=3)
        cursor = self.db.cursor()
        cursor.execute("""INSERT INTO bugzillas VALUES (%s, %s, %s)""",
                    shorthand, url, description)
        self.db.commit()
        irc.reply(msg, 'Added bugzilla entry for "%s" with shorthand "%s"' % (
            description, shorthand))
        return

    def remove(self, irc, msg, args):
        """<abbreviation>

        Remove the bugzilla associated with <abbreviation> from the list of
        defined bugzillae.
        """
        shorthand = privmsgs.getArgs(args)
        cursor = self.db.cursor()
        cursor.execute("""SELECT * from bugzillas where shorthand = %s""",
            shorthand)
        if cursor.rowcount == 0:
            irc.reply(msg, 'Bugzilla "%s" not defined. Try list.' %
                shorthand)
            return
        cursor.execute("""DELETE FROM bugzillas where shorthand = %s""",
            shorthand)
        self.db.commit()
        irc.reply(msg, 'Deleted bugzilla "%s"' % shorthand)
        return

    def list(self, irc,  msg, args):
        """[<abbreviation>]

        List defined bugzillae. If <abbreviation> is specified, list the
        information for that bugzilla.
        """
        shorthand = privmsgs.getArgs(args, needed=0, optional=1)
        if shorthand:
            cursor = self.db.cursor()
            cursor.execute("""SELECT url,description from bugzillas where
                              shorthand = %s""", shorthand)
            if cursor.rowcount == 0:
                irc.reply(msg, 'No such bugzilla defined: "%s".' % shorthand)
                return
            url, description = cursor.fetchone()
            irc.reply(msg, '%s: %s, %s' % (shorthand, description, url))
            return
        else:
            cursor = self.db.cursor()
            cursor.execute("""SELECT shorthand from bugzillas""")
            if cursor.rowcount == 0:
                irc.reply(msg, 'No bugzillae defined. Add some with "add"!')
                return
            results = ['%s' % (item[0]) for item in cursor.fetchall()]
            irc.reply(msg, 'Defined bugzillae: %s' % ' '.join(results))
            return    

    def bzSnarfer(self, irc, msg, match):
        r"(http://\S+)/show_bug.cgi\?id=([0-9]+)"
        if not self.configurables.get('bug-snarfer', channel=msg.args[0]):
            return
        queryurl = '%s/xml.cgi?id=%s' % (match.group(1), match.group(2))
        try:
            summary = self._get_short_bug_summary(queryurl, 'Snarfed '\
                'Bugzilla URL', match.group(2))
        except BugError, e:
            irc.reply(msg, str(e))
            return
        except IOError, e:
            msgtouser = '%s. Try yourself: %s' % (e, queryurl)
            irc.reply(msg, msgtouser)
            return
        report = {}
        report['id'] = match.group(2)
        report['url'] = str('%s/show_bug.cgi?id=%s' % (match.group(1),
            match.group(2)))
        report['title'] = str(summary['title'])
        report['summary'] = str(self._mk_summary_string(summary))
        report['product'] = str(summary['product'])
        s = '%(product)s bug #%(id)s: %(title)s %(summary)s' % report
        irc.reply(msg, s, prefixName=False)
    bzSnarfer = privmsgs.urlSnarfer(bzSnarfer)
        
    def bug(self, irc, msg, args):
        """<abbreviation> <number>

        Look up bug <number> in the bugzilla associated with <abbreviation>.
        """
        (shorthand, num) = privmsgs.getArgs(args, needed=2)
        cursor = self.db.cursor()
        cursor.execute("""SELECT url,description from bugzillas where
                          shorthand = %s""", shorthand)
        if cursor.rowcount == 0:
            irc.reply(msg, 'Bugzilla "%s" is not defined.' % shorthand)
            return
        if not self._is_bug_number(num):
            irc.reply(msg, '"%s" does not seem to be a number' % num)
            return
        url, desc = cursor.fetchone()
        queryurl = '%s/xml.cgi?id=%s' % (url, num)
        try:
            summary = self._get_short_bug_summary(queryurl, desc, num)
        except BugError, e:
            irc.reply(msg, str(e))
            return
        except IOError, e:
            msgtouser = '%s. Try yourself: %s' % (e, queryurl)
            irc.reply(msg, msgtouser)
            return

        report = {}
        report['zilla'] = str(desc)
        report['id'] = str(num)
        report['url'] = str('%s/show_bug.cgi?id=%s' % (url, num))
        report['title'] = str(summary['title'])
        report['summary'] = str(self._mk_summary_string(summary))
        s = '%(zilla)s bug #%(id)s: %(title)s %(summary)s %(url)s' % report
        irc.reply(msg, s)

    def _mk_summary_string(self, summary):
        L = []
        if 'product' in summary:
            L.append(ircutils.bold('Product: ') + summary['product'])
        if 'component' in summary:
            L.append(ircutils.bold('Component: ') + summary['component'])
        if 'severity' in summary:
            L.append(ircutils.bold('Severity: ') + summary['severity'])
        if 'assigned to' in summary:
            L.append(ircutils.bold('Assigned to: ') + summary['assigned to'])
        if 'status' in summary:
            L.append(ircutils.bold('Status: ') + summary['status'])
        if 'resolution' in summary:
            L.append(ircutils.bold('Resolution: ') + summary['resolution'])
        return ', '.join(L)

    def _is_bug_number(self, bug):
        try:
            int(bug)
            return True
        except ValueError:
            return False
        
    def _get_short_bug_summary(self, url, desc, num):
        bugxml = self._getbugxml(url, desc)
        try: zilladom = minidom.parseString(bugxml)
        except Exception, e:
            msg = 'Could not parse XML returned by %s bugzilla: %s'
            raise BugError, msg % (desc, e)
        bug_n = zilladom.getElementsByTagName('bug')[0]
        if bug_n.hasAttribute('error'):
            errtxt = bug_n.getAttribute('error')
            zilladom.unlink()
            msg = 'Error getting %s bug #%s: %s' % (desc, num, errtxt)
            raise BugError(str(msg))
        summary = {}
        try:
            node = bug_n.getElementsByTagName('short_desc')[0]
            summary['title'] = self._getnodetxt(node)
            node = bug_n.getElementsByTagName('bug_status')[0]
            summary['status'] = self._getnodetxt(node)
            try:
                node = bug_n.getElementsByTagName('resolution')[0]
                summary['resolution'] = self._getnodetxt(node)
            except:
                pass
            node = bug_n.getElementsByTagName('assigned_to')[0]
            summary['assigned to'] = self._getnodetxt(node)
            node = bug_n.getElementsByTagName('product')[0]
            summary['product'] = self._getnodetxt(node)
            node = bug_n.getElementsByTagName('component')[0]
            summary['component'] = self._getnodetxt(node)
            node = bug_n.getElementsByTagName('bug_severity')[0]
            summary['severity'] = self._getnodetxt(node)
        except Exception, e:
            zilladom.unlink()
            msg = 'Could not parse XML returned by %s bugzilla: %s'
            raise BugError(str(msg % (desc, e)))
        zilladom.unlink()
        return summary

    def _getbugxml(self, url, desc):
        try:
            fh = urllib.urlopen(url)
        except:
            raise IOError('Connection to %s bugzilla failed' % desc)
        bugxml = fh.read()
        fh.close()
        if not bugxml:
            raise IOError, 'Error getting bug content from %s' % desc
        return bugxml

    def _getnodetxt(self, node):
        L = []
        for childnode in node.childNodes:
            if childnode.nodeType == childnode.TEXT_NODE:
                L.append(childnode.data)
        val = ''.join(L)
        if node.hasAttribute('encoding'):
            encoding = node.getAttribute('encoding')
            if encoding == 'base64':
                try:
                    val = val.decode('base64')
                except:
                    val = 'Cannot convert bug data from base64.'
        while self.entre.search(val):
            entity = self.entre.search(val).group(1)
            if entity in entities:
                val = re.sub(self.entre, entities[entity], val)
            else:
                val = re.sub(self.entre, '_', val)
        return val


Class = Bugzilla

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