#
# 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.

import os
import platform
import re
import shutil
import sys

from color import Coloring
from command import InteractiveCommand, MirrorSafeCommand
from error import ManifestParseError
from project import SyncBuffer
from git_config import GitConfig
from git_command import git_require, MIN_GIT_VERSION

class Init(InteractiveCommand, MirrorSafeCommand):
  common = True
  helpSummary = "Initialize repo in the current directory"
  helpUsage = """
%prog [options]
"""
  helpDescription = """
The '%prog' command is run once to install and initialize repo.
The latest repo source code and manifest collection is downloaded
from the server and is installed in the .repo/ directory in the
current working directory.

The optional -b argument can be used to select the manifest branch
to checkout and use.  If no branch is specified, master is assumed.

The optional -m argument can be used to specify an alternate manifest
to be used. If no manifest is specified, the manifest default.xml
will be used.

The --reference option can be used to point to a directory that
has the content of a --mirror sync. This will make the working
directory use as much data as possible from the local reference
directory when fetching from the server. This will make the sync
go a lot faster by reducing data traffic on the network.


Switching Manifest Branches
---------------------------

To switch to another manifest branch, `repo init -b otherbranch`
may be used in an existing client.  However, as this only updates the
manifest, a subsequent `repo sync` (or `repo sync -d`) is necessary
to update the working directory files.
"""

  def _Options(self, p):
    # Logging
    g = p.add_option_group('Logging options')
    g.add_option('-q', '--quiet',
                 dest="quiet", action="store_true", default=False,
                 help="be quiet")

    # Manifest
    g = p.add_option_group('Manifest options')
    g.add_option('-u', '--manifest-url',
                 dest='manifest_url',
                 help='manifest repository location', metavar='URL')
    g.add_option('-b', '--manifest-branch',
                 dest='manifest_branch',
                 help='manifest branch or revision', metavar='REVISION')
    g.add_option('-m', '--manifest-name',
                 dest='manifest_name', default='default.xml',
                 help='initial manifest file', metavar='NAME.xml')
    g.add_option('--mirror',
                 dest='mirror', action='store_true',
                 help='create a replica of the remote repositories '
                      'rather than a client working directory')
    g.add_option('--reference',
                 dest='reference',
                 help='location of mirror directory', metavar='DIR')
    g.add_option('--depth', type='int', default=None,
                 dest='depth',
                 help='create a shallow clone with given depth; see git clone')
    g.add_option('-g', '--groups',
                 dest='groups', default='all,-notdefault',
                 help='restrict manifest projects to ones with a specified group',
                 metavar='GROUP')
    g.add_option('-p', '--platform',
                 dest='platform', default='auto',
                 help='restrict manifest projects to ones with a specified '
                      'platform group [auto|all|none|linux|darwin|...]',
                 metavar='PLATFORM')

    # Tool
    g = p.add_option_group('repo Version options')
    g.add_option('--repo-url',
                 dest='repo_url',
                 help='repo repository location', metavar='URL')
    g.add_option('--repo-branch',
                 dest='repo_branch',
                 help='repo branch or revision', metavar='REVISION')
    g.add_option('--no-repo-verify',
                 dest='no_repo_verify', action='store_true',
                 help='do not verify repo source code')

    # Other
    g = p.add_option_group('Other options')
    g.add_option('--config-name',
                 dest='config_name', action="store_true", default=False,
                 help='Always prompt for name/e-mail')

  def _SyncManifest(self, opt):
    m = self.manifest.manifestProject
    is_new = not m.Exists

    if is_new:
      if not opt.manifest_url:
        print >>sys.stderr, 'fatal: manifest url (-u) is required.'
        sys.exit(1)

      if not opt.quiet:
        print >>sys.stderr, 'Get %s' \
          % GitConfig.ForUser().UrlInsteadOf(opt.manifest_url)
      m._InitGitDir()

      if opt.manifest_branch:
        m.revisionExpr = opt.manifest_branch
      else:
        m.revisionExpr = 'refs/heads/master'
    else:
      if opt.manifest_branch:
        m.revisionExpr = opt.manifest_branch
      else:
        m.PreSync()

    if opt.manifest_url:
      r = m.GetRemote(m.remote.name)
      r.url = opt.manifest_url
      r.ResetFetch()
      r.Save()

    groups = re.split(r'[,\s]+', opt.groups)
    all_platforms = ['linux', 'darwin']
    platformize = lambda x: 'platform-' + x
    if opt.platform == 'auto':
      if (not opt.mirror and
          not m.config.GetString('repo.mirror') == 'true'):
        groups.append(platformize(platform.system().lower()))
    elif opt.platform == 'all':
      groups.extend(map(platformize, all_platforms))
    elif opt.platform in all_platforms:
      groups.extend(platformize(opt.platform))
    elif opt.platform != 'none':
      print >>sys.stderr, 'fatal: invalid platform flag'
      sys.exit(1)

    groups = [x for x in groups if x]
    groupstr = ','.join(groups)
    if opt.platform == 'auto' and groupstr == 'all,-notdefault,platform-' + platform.system().lower():
      groupstr = None
    m.config.SetString('manifest.groups', groupstr)

    if opt.reference:
      m.config.SetString('repo.reference', opt.reference)

    if opt.mirror:
      if is_new:
        m.config.SetString('repo.mirror', 'true')
      else:
        print >>sys.stderr, 'fatal: --mirror not supported on existing client'
        sys.exit(1)

    if not m.Sync_NetworkHalf(is_new=is_new):
      r = m.GetRemote(m.remote.name)
      print >>sys.stderr, 'fatal: cannot obtain manifest %s' % r.url

      # Better delete the manifest git dir if we created it; otherwise next
      # time (when user fixes problems) we won't go through the "is_new" logic.
      if is_new:
        shutil.rmtree(m.gitdir)
      sys.exit(1)

    if opt.manifest_branch:
      m.MetaBranchSwitch(opt.manifest_branch)

    syncbuf = SyncBuffer(m.config)
    m.Sync_LocalHalf(syncbuf)
    syncbuf.Finish()

    if is_new or m.CurrentBranch is None:
      if not m.StartBranch('default'):
        print >>sys.stderr, 'fatal: cannot create default in manifest'
        sys.exit(1)

  def _LinkManifest(self, name):
    if not name:
      print >>sys.stderr, 'fatal: manifest name (-m) is required.'
      sys.exit(1)

    try:
      self.manifest.Link(name)
    except ManifestParseError as e:
      print >>sys.stderr, "fatal: manifest '%s' not available" % name
      print >>sys.stderr, 'fatal: %s' % str(e)
      sys.exit(1)

  def _Prompt(self, prompt, value):
    sys.stdout.write('%-10s [%s]: ' % (prompt, value))
    a = sys.stdin.readline().strip()
    if a == '':
      return value
    return a

  def _ShouldConfigureUser(self):
    gc = self.manifest.globalConfig
    mp = self.manifest.manifestProject

    # If we don't have local settings, get from global.
    if not mp.config.Has('user.name') or not mp.config.Has('user.email'):
      if not gc.Has('user.name') or not gc.Has('user.email'):
        return True

      mp.config.SetString('user.name', gc.GetString('user.name'))
      mp.config.SetString('user.email', gc.GetString('user.email'))

    print ''
    print 'Your identity is: %s <%s>' % (mp.config.GetString('user.name'),
                                         mp.config.GetString('user.email'))
    print 'If you want to change this, please re-run \'repo init\' with --config-name'
    return False

  def _ConfigureUser(self):
    mp = self.manifest.manifestProject

    while True:
      print ''
      name  = self._Prompt('Your Name', mp.UserName)
      email = self._Prompt('Your Email', mp.UserEmail)

      print ''
      print 'Your identity is: %s <%s>' % (name, email)
      sys.stdout.write('is this correct [y/N]? ')
      a = sys.stdin.readline().strip()
      if a in ('yes', 'y', 't', 'true'):
        break

    if name != mp.UserName:
      mp.config.SetString('user.name', name)
    if email != mp.UserEmail:
      mp.config.SetString('user.email', email)

  def _HasColorSet(self, gc):
    for n in ['ui', 'diff', 'status']:
      if gc.Has('color.%s' % n):
        return True
    return False

  def _ConfigureColor(self):
    gc = self.manifest.globalConfig
    if self._HasColorSet(gc):
      return

    class _Test(Coloring):
      def __init__(self):
        Coloring.__init__(self, gc, 'test color display')
        self._on = True
    out = _Test()

    print ''
    print "Testing colorized output (for 'repo diff', 'repo status'):"

    for c in ['black','red','green','yellow','blue','magenta','cyan']:
      out.write(' ')
      out.printer(fg=c)(' %-6s ', c)
    out.write(' ')
    out.printer(fg='white', bg='black')(' %s ' % 'white')
    out.nl()

    for c in ['bold','dim','ul','reverse']:
      out.write(' ')
      out.printer(fg='black', attr=c)(' %-6s ', c)
    out.nl()

    sys.stdout.write('Enable color display in this user account (y/N)? ')
    a = sys.stdin.readline().strip().lower()
    if a in ('y', 'yes', 't', 'true', 'on'):
      gc.SetString('color.ui', 'auto')

  def _ConfigureDepth(self, opt):
    """Configure the depth we'll sync down.

    Args:
      opt: Options from optparse.  We care about opt.depth.
    """
    # Opt.depth will be non-None if user actually passed --depth to repo init.
    if opt.depth is not None:
      if opt.depth > 0:
        # Positive values will set the depth.
        depth = str(opt.depth)
      else:
        # Negative numbers will clear the depth; passing None to SetString
        # will do that.
        depth = None

      # We store the depth in the main manifest project.
      self.manifest.manifestProject.config.SetString('repo.depth', depth)

  def _DisplayResult(self):
    if self.manifest.IsMirror:
      init_type = 'mirror '
    else:
      init_type = ''

    print ''
    print 'repo %shas been initialized in %s' % (init_type, self.manifest.topdir)

    current_dir = os.getcwd()
    if current_dir != self.manifest.topdir:
      print 'If this is not the directory in which you want to initialize repo, please run:'
      print '   rm -r %s/.repo' % self.manifest.topdir
      print 'and try again.'

  def Execute(self, opt, args):
    git_require(MIN_GIT_VERSION, fail=True)

    if opt.reference:
      opt.reference = os.path.expanduser(opt.reference)

    self._SyncManifest(opt)
    self._LinkManifest(opt.manifest_name)

    if os.isatty(0) and os.isatty(1) and not self.manifest.IsMirror:
      if opt.config_name or self._ShouldConfigureUser():
        self._ConfigureUser()
      self._ConfigureColor()

    self._ConfigureDepth(opt)

    self._DisplayResult()