#! /usr/bin/env python
# Copyright (C) 2012 Dr. Ralf Schlatterbeck Open Source Consulting.
# Reichergasse 131, A-3411 Weidling.
# Web: http://www.runtux.com Email: rsc@runtux.com
# All rights reserved
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
#   The above copyright notice and this permission notice shall be included in
#   all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

_doc = '''
%prog [options]
Remove file attachment spam from a tracker:
- Edit the journal of the given issue(s) and remove the links to the
  spam-files
- Set the contents of the spam-files involved to zero length
WARNING:
This is a dangerous operation as it will edit the history *and* remove
data that is not in the journal (the contents of files). Be careful with
the file pattern (start of filename) you specify!
'''

import sys
from   optparse import OptionParser
from   roundup  import instance, hyperdb

def main():
    cmd = OptionParser(usage=_doc)
    cmd.add_option \
        ( "-i", "--instance"
        , help    = "Instance home"
        , default = "."
        )
    cmd.add_option \
        ( "-d", "--designator"
        , dest    = "designators"
        , help    = "Item designator for issue(s), to remove files from,\n"
                    "e.g. issue4711"
        , action  = "append"
        , default = []
        )
    cmd.add_option \
        ( "-f", "--filename"
        , dest    = "filenames"
        , help    = "Exact spam-filename to remove from issue(s)"
        , action  = "append"
        , default = []
        )
    cmd.add_option \
        ( "-a", "--action", "--no-dry-run"
        , dest    = "doit"
        , help    = "Don't perform any action by default unless specified"
        , action  = "store_true"
        )
    cmd.add_option \
        ( "-s", "--file-start-pattern"
        , dest    = "file_pattern"
        , help    = "Start of spam-filename to remove from issue(s)"
        , action  = "append"
        , default = []
        )
    cmd.add_option \
        ( "-u", "--spam-user"
        , dest    = "users"
        , help    = "Username that created the spam-files to remove"
        , action  = "append"
        , default = []
        )
    cmd.add_option \
        ( "-q", "--quiet"
        , dest    = "quiet"
        , help    = "Be quiet about what we're doing"
        , action  = "store_true"
        )
    opt, args = cmd.parse_args()
    # open the instance
    if len(args):
        print("This command doesn't take arguments", file=sys.stderr)
        cmd.show_help()
    tracker = instance.open(opt.instance)
    db = tracker.open('admin')
    db.tx_Source = "cli"

    users = dict.fromkeys (db.user.lookup(u) for u in opt.users)
    files_to_remove = {}
    for fn in opt.filenames:
        for fid in db.file.filter(None,dict(name=fn)):
            if db.file.get(fid,'name') == fn:
                files_to_remove[fid] = True
    for fn in opt.file_pattern:
        for fid in db.file.filter(None,dict(name=fn)):
            if db.file.get(fid,'name').startswith(fn):
                files_to_remove[fid] = True
    files_found = {}
    for d in opt.designators:
        clsname, id = hyperdb.splitDesignator(d)
        cls = db.getclass(clsname)
        issuefiles = dict.fromkeys(cls.get (id, 'files'))
        for fid in list(issuefiles.keys()):
            f = db.file.getnode(fid)
            if fid in files_to_remove or f.creator in users:
                files_to_remove[fid] = True
                files_found[fid] = True
                if not opt.quiet:
                    print("deleting file %s from issue" % f)
                del issuefiles[fid]
        if opt.doit:
            cls.set(id, files=list(issuefiles.keys()))
        journal = oldjournal = db.getjournal(clsname, id)
        # do this twice, we may have file-removals *before* file
        # additions for files to delete and may discover mid-journal
        # that there are new files to remove
        for x in range(2):
            newjournal = []
            for j in journal:
                if j[3] == 'set' and 'files' in j[4]:
                    if j[4]['files'][0][0] not in ('-', '+') :
                        newjournal.append(j)
                        continue
                    changes = dict(j[4]['files'])
                    # only consider file additions by this user
                    if j[2] in users and '+' in changes:
                        f = dict.fromkeys(changes['+'])
                        files_found.update(f)
                        files_to_remove.update(f)
                        del changes['+']
                    # change dict in-place
                    for k, v in list(changes.items()):
                        new_f = []
                        for f in v:
                            if f in files_to_remove:
                                files_found[f] = True
                            else:
                                new_f.append(f)
                        if new_f :
                            changes[k] = new_f
                        else:
                            del changes[k]
                    msg = []
                    if not opt.quiet:
                        msg.append ("Old journal entry: %s" % str(j))
                    if changes:
                        j[4]['files'] = tuple(changes.items())
                    else:
                        del j[4]['files']
                    if j[4]:
                        newjournal.append(j)
                        if not opt.quiet:
                            msg.append ("New journal entry: %s" % str(j))
                    elif not opt.quiet:
                        msg.append ("deleted")
                    if len(msg) == 2 and msg[0][4:] != msg[1][4:]:
                        for m in msg:
                            print(m)
                else:
                    newjournal.append(j)
            journal = newjournal
        if newjournal != oldjournal and opt.doit:
            db.setjournal(clsname, id, newjournal)
    if opt.doit:
        for f in files_found:
            db.file.set(f, content=' ')
        db.commit()
    else:
        print("Database not changed")


if __name__ == '__main__':
    main()