#!/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 urllib as _urllib
import string as _string
import xml.dom.minidom as _minidom
import base64 as _base64
import re as _re
import os
from htmlentitydefs import entitydefs as _entities

import plugins

import string

import utils
import privmsgs
import callbacks
import conf
import sqlite

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"""
    def __init__(self, args = None):
        Exception.__init__(self)
        self.args = args

def configure(onStart, afterConnect, advanced):
    from questions import expect, anything, yn
    onStart.append('load Bugzilla')

class Bugzilla(callbacks.Privmsg):
    """Show a link to a bug report with a brief description"""
    threaded = True
    def __init__(self):
        callbacks.Privmsg.__init__(self)
        self.entre = _re.compile('&(\S*?);')
        self.db = makeDb(dbfilename)

    def die(self):
        self.db.close()
        del self.db
        # quick hack for testing only
        import sys
        global _base64, _minidom
        del _base64
        del _minidom
        for mod in ['xml.dom.minidom', 'base64']:
            if sys.modules.has_key(mod):
                del sys.modules[mod]
        import gc
        gc.collect()

    def addzilla(self, irc, msg, args):
        """shorthand url description
        Add a bugzilla to the list of defined bugzillae.
        E.g.: addzilla rh http://bugzilla.redhat.com/bugzilla Red Hat Zilla"""
        try:
            words = args
            shorthand = words.pop(0)
            url = words.pop(0)
            description = ' '.join(words)
        except:
            irc.reply(msg, 'Invalid format, please see help addzilla')
            return
        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 delzilla(self, irc, msg, args):
        """shorthand
        Delete a bugzilla from the list of define bugzillae.
        E.g.: delzilla rh"""
        shorthand = ' '.join(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 zillalist.' % shorthand)
            return
        cursor.execute("""DELETE FROM bugzillas where shorthand = %s""", shorthand)
        self.db.commit()
        irc.reply(msg, 'Deleted bugzilla "%s"' % shorthand)
        return

    def listzilla(self, irc,  msg, args):
        """[shorthand]
        List defined bugzillae
        E.g.: listzilla rh; or just listzilla"""
        shorthand = ' '.join(args)
        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 "addzilla"!')
                return
            results = ['%s' % (item[0]) for item in cursor.fetchall()]
            irc.reply(msg, 'Defined bugzillae: %s' % ' '.join(results))
            return    

    def bug(self, irc, msg, args):
        """bug shorthand number
        Look up a bug number in a bugzilla.
        E.g.: bug rh 10301"""
        try: shorthand, num = args
        except:
            irc.reply(msg, 'Invalid format. Try help bug')
            return
        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_component_severity_status(summary))
        irc.reply(msg, '%(zilla)s bug #%(id)s: %(title)s' % report)
        irc.reply(msg, '  %(summary)s' % report)
        irc.reply(msg, '  %(url)s' % report)
        return

    def _mk_component_severity_status(self, summary):
        ary = []
        if summary.has_key('component'):
            ary.append('Component: %s' % summary['component'])
        if summary.has_key('severity'):
            ary.append('Severity: %s' % summary['severity'])
        if summary.has_key('status'):
            if summary.has_key('resolution'):
                ary.append('Status: %s/%s' %
                           (summary['status'], summary['resolution']))
            else:
                ary.append('Status: %s' % summary['status'])
        out = _string.join(ary, ', ')
        return out

    def _is_bug_number(self, bug):
        try: int(bug)
        except: return 0
        else: return 1
        
    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(str(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('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 = ''
        while 1:
            chunk = fh.read(8192)
            if chunk == '':
                break
            bugxml = bugxml + chunk
        fh.close()
        if not len(bugxml):
            msg = 'Error getting bug content from %s' % desc
            raise IOError(msg)
        return bugxml

    def _getnodetxt(self, node):
        val = ''
        for childnode in node.childNodes:
            if childnode.nodeType == childnode.TEXT_NODE:
                val = val + childnode.data
        if node.hasAttribute('encoding'):
            encoding = node.getAttribute('encoding')
            if encoding == 'base64':
                try:
                    val = _base64.decodestring(val)
                except:
                    val = 'Cannot convert bug data from base64!'
        entre = self.entre
        while entre.search(val):
            entity = entre.search(val).group(1)
            if _entities.has_key(entity):
                val = _re.sub(entre, _entities[entity], val)
            else:
                val = _re.sub(entre, '_', val)
        return val
Class = Bugzilla