# Copyright (C) 2008-2009 W. Trevor King <wking@drexel.edu>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
"""Merge duplicate bugs"""
from libbe import cmdutil, bugdir
import os, copy
__desc__ = __doc__

def execute(args, test=False):
    """
    >>> from libbe import utility
    >>> bd = bugdir.simple_bug_dir()
    >>> bd.set_sync_with_disk(True)
    >>> a = bd.bug_from_shortname("a")
    >>> a.comment_root.time = 0
    >>> dummy = a.new_comment("Testing")
    >>> dummy.time = 1
    >>> dummy = dummy.new_reply("Testing...")
    >>> dummy.time = 2
    >>> b = bd.bug_from_shortname("b")
    >>> b.status = "open"
    >>> b.comment_root.time = 0
    >>> dummy = b.new_comment("1 2")
    >>> dummy.time = 1
    >>> dummy = dummy.new_reply("1 2 3 4")
    >>> dummy.time = 2
    >>> os.chdir(bd.root)
    >>> execute(["a", "b"], test=True)
    Merging bugs a and b
    >>> bd._clear_bugs()
    >>> a = bd.bug_from_shortname("a")
    >>> a.load_comments()
    >>> mergeA = a.comment_from_shortname(":3")
    >>> mergeA.time = 3
    >>> print a.string(show_comments=True) # doctest: +ELLIPSIS
              ID : a
      Short name : a
        Severity : minor
          Status : open
        Assigned : 
          Target : 
        Reporter : 
         Creator : John Doe <jdoe@example.com>
         Created : ...
    Bug A
    --------- Comment ---------
    Name: a:1
    From: ...
    Date: ...
    <BLANKLINE>
    Testing
      --------- Comment ---------
      Name: a:2
      From: ...
      Date: ...
    <BLANKLINE>
      Testing...
    --------- Comment ---------
    Name: a:3
    From: ...
    Date: ...
    <BLANKLINE>
    Merged from bug b
      --------- Comment ---------
      Name: a:4
      From: ...
      Date: ...
    <BLANKLINE>
      1 2
        --------- Comment ---------
        Name: a:5
        From: ...
        Date: ...
    <BLANKLINE>
        1 2 3 4
    >>> b = bd.bug_from_shortname("b")
    >>> b.load_comments()
    >>> mergeB = b.comment_from_shortname(":3")
    >>> mergeB.time = 3
    >>> print b.string(show_comments=True) # doctest: +ELLIPSIS
              ID : b
      Short name : b
        Severity : minor
          Status : closed
        Assigned : 
          Target : 
        Reporter : 
         Creator : Jane Doe <jdoe@example.com>
         Created : ...
    Bug B
    --------- Comment ---------
    Name: b:1
    From: ...
    Date: ...
    <BLANKLINE>
    1 2
      --------- Comment ---------
      Name: b:2
      From: ...
      Date: ...
    <BLANKLINE>
      1 2 3 4
    --------- Comment ---------
    Name: b:3
    From: ...
    Date: ...
    <BLANKLINE>
    Merged into bug a
    >>> print b.status
    closed
    """
    parser = get_parser()
    options, args = parser.parse_args(args)
    cmdutil.default_complete(options, args, parser,
                             bugid_args={0: lambda bug : bug.active==True,
                                         1: lambda bug : bug.active==True})

    if len(args) < 2:
        raise cmdutil.UsageError("Please specify two bug ids.")
    if len(args) > 2:
        help()
        raise cmdutil.UsageError("Too many arguments.")
    
    bd = bugdir.BugDir(from_disk=True, manipulate_encodings=not test)
    bugA = cmdutil.bug_from_shortname(bd, args[0])
    bugA.load_comments()
    bugB = cmdutil.bug_from_shortname(bd, args[1])
    bugB.load_comments()
    mergeA = bugA.new_comment("Merged from bug %s" % bugB.uuid)
    newCommTree = copy.deepcopy(bugB.comment_root)
    for comment in newCommTree.traverse(): # all descendant comments
        comment.bug = bugA
        comment.save() # force onto disk under bugA
    for comment in newCommTree: # just the child comments
        mergeA.add_reply(comment, allow_time_inversion=True)
    bugB.new_comment("Merged into bug %s" % bugA.uuid)
    bugB.status = "closed"
    print "Merging bugs %s and %s" % (bugA.uuid, bugB.uuid)

def get_parser():
    parser = cmdutil.CmdOptionParser("be merge BUG-ID BUG-ID")
    return parser

longhelp="""
The second bug (B) is merged into the first (A).  This adds merge
comments to both bugs, closes B, and appends B's comment tree to A's
merge comment.
"""

def help():
    return get_parser().help_str() + longhelp