#
# Copyright (C) 2008 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from command import PagedCommand

#try:
import threading as _threading
#except ImportError:
#  import dummy_threading as _threading

import glob
import itertools
import os
import sys
import io

from color import Coloring


class Status(PagedCommand):
    common = True
    helpSummary = "Show the working tree status"
    helpUsage = """
%prog [<project>...]
"""
    helpDescription = """
'%prog' compares the working tree to the staging area (aka index),
and the most recent commit on this branch (HEAD), in each project
specified.  A summary is displayed, one line per file where there
is a difference between these three states.

The -j/--jobs option can be used to run multiple status queries
in parallel.

The -o/--orphans option can be used to show objects that are in
the working directory, but not associated with a repo project.
This includes unmanaged top-level files and directories, but also
includes deeper items.  For example, if dir/subdir/proj1 and
dir/subdir/proj2 are repo projects, dir/subdir/proj3 will be shown
if it is not known to repo.

Status Display
--------------

The status display is organized into three columns of information,
for example if the file 'subcmds/status.py' is modified in the
project 'repo' on branch 'devwork':

  project repo/                                   branch devwork
   -m     subcmds/status.py

The first column explains how the staging area (index) differs from
the last commit (HEAD).  Its values are always displayed in upper
case and have the following meanings:

 -:  no difference
 A:  added         (not in HEAD,     in index                     )
 M:  modified      (    in HEAD,     in index, different content  )
 D:  deleted       (    in HEAD, not in index                     )
 R:  renamed       (not in HEAD,     in index, path changed       )
 C:  copied        (not in HEAD,     in index, copied from another)
 T:  mode changed  (    in HEAD,     in index, same content       )
 U:  unmerged; conflict resolution required

The second column explains how the working directory differs from
the index.  Its values are always displayed in lower case and have
the following meanings:

 -:  new / unknown (not in index,     in work tree                )
 m:  modified      (    in index,     in work tree, modified      )
 d:  deleted       (    in index, not in work tree                )

"""

    def _Options(self, p):
        p.add_option('-j', '--jobs',
                     dest='jobs', action='store', type='int', default=2,
                     help="number of projects to check simultaneously")
        p.add_option('-o', '--orphans',
                     dest='orphans', action='store_true',
                     help="include objects in working directory outside of repo projects")

    def _StatusHelper(self, project, clean_counter, sem, output):
        """Obtains the status for a specific project.

        Obtains the status for a project, redirecting the output to
        the specified object. It will release the semaphore
        when done.

        Args:
          project: Project to get status of.
          clean_counter: Counter for clean projects.
          sem: Semaphore, will call release() when complete.
          output: Where to output the status.
        """
        try:
            state = project.PrintWorkTreeStatus(output)
            if state == 'CLEAN':
                clean_counter.__next__()
        finally:
            sem.release()

    def _FindOrphans(self, dirs, proj_dirs, proj_dirs_parents, outstring):
        """find 'dirs' that are present in 'proj_dirs_parents' but not in 'proj_dirs'"""
        status_header = ' --\t'
        for item in dirs:
            if not os.path.isdir(item):
                outstring.write(''.join([status_header, item]))
                continue
            if item in proj_dirs:
                continue
            if item in proj_dirs_parents:
                self._FindOrphans(glob.glob('%s/.*' % item) + \
                                  glob.glob('%s/*' % item), \
                                  proj_dirs, proj_dirs_parents, outstring)
                continue
            outstring.write(''.join([status_header, item, '/']))

    def Execute(self, opt, args):
        all_projects = self.GetProjects(args)
        counter = itertools.count()

        if opt.jobs == 1:
            for project in all_projects:
                state = project.PrintWorkTreeStatus()
                if state == 'CLEAN':
                    counter.__next__()
        else:
            sem = _threading.Semaphore(opt.jobs)
            threads_and_output = []
            for project in all_projects:
                sem.acquire()

                class BufList(io.StringIO):
                    def dump(self, ostream):
                        ostream.write(self.getvalue())

                output = BufList()

                t = _threading.Thread(target=self._StatusHelper,
                                      args=(project, counter, sem, output))
                threads_and_output.append((t, output))
                t.daemon = True
                t.start()
            for (t, output) in threads_and_output:
                t.join()
                output.dump(sys.stdout)
                output.close()
        if len(all_projects) == counter.__next__():
            print('nothing to commit (working directory clean)')

        if opt.orphans:
            proj_dirs = set()
            proj_dirs_parents = set()
            for project in self.GetProjects(None, missing_ok=True):
                proj_dirs.add(project.relpath)
                (head, _tail) = os.path.split(project.relpath)
                while head != "":
                    proj_dirs_parents.add(head)
                    (head, _tail) = os.path.split(head)
            proj_dirs.add('.repo')

            class StatusColoring(Coloring):
                def __init__(self, config):
                    Coloring.__init__(self, config, 'status')
                    self.project = self.printer('header', attr='bold')
                    self.untracked = self.printer('untracked', fg='red')

            orig_path = os.getcwd()
            try:
                os.chdir(self.manifest.topdir)

                outstring = io.StringIO.StringIO()
                self._FindOrphans(glob.glob('.*') + \
                                  glob.glob('*'), \
                                  proj_dirs, proj_dirs_parents, outstring)

                if outstring.buflist:
                    output = StatusColoring(self.manifest.globalConfig)
                    output.project('Objects not within a project (orphans)')
                    output.nl()
                    for entry in outstring.buflist:
                        output.untracked(entry)
                        output.nl()
                else:
                    print('No orphan files or directories')

                outstring.close()

            finally:
                # Restore CWD.
                os.chdir(orig_path)
