#!/usr/bin/env python
# -*- coding: utf-8 -*-
# 
# Copyright (C) 2003-2010 Edgewall Software
# All rights reserved.
#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution. The terms
# are also available at http://trac.edgewall.org/wiki/TracLicense.
#
# This software consists of voluntary contributions made by many
# individuals. For the exact contribution history, see the revision
# history and logs, available at http://trac.edgewall.org/log/.

from __future__ import with_statement

import cmd
import locale
import os.path
import pkg_resources
from shlex import shlex
import StringIO
import sys
import traceback

from trac import __version__ as VERSION
from trac.admin import AdminCommandError, AdminCommandManager
from trac.core import TracError
from trac.env import Environment
from trac.ticket.model import *
from trac.util import translation
from trac.util.html import html
from trac.util.text import console_print, exception_to_unicode, printout, \
                           printerr, raw_input, to_unicode
from trac.util.translation import _, get_negotiated_locale, has_babel, \
                                  cleandoc_
from trac.versioncontrol.api import RepositoryManager
from trac.wiki.admin import WikiAdmin
from trac.wiki.macros import WikiMacroBase

TRAC_VERSION = pkg_resources.get_distribution('Trac').version
rl_completion_suppress_append = None
LANG = os.environ.get('LANG')

def find_readline_lib():
    """Return the name (and possibly the full path) of the readline library
    linked to the readline module.
    """
    import readline
    with open(readline.__file__, "rb") as f:
        data = f.read()
    import re
    m = re.search('\0([^\0]*libreadline[^\0]*)\0', data)
    if m:
        return m.group(1)
    return None
    

class TracAdmin(cmd.Cmd):
    intro = ''
    doc_header = 'Trac Admin Console %(version)s\n' \
                 'Available Commands:\n' \
                 % {'version': TRAC_VERSION}
    ruler = ''
    prompt = "Trac> "
    envname = None
    __env = None

    def __init__(self, envdir=None):
        cmd.Cmd.__init__(self)
        try:
            import readline
            delims = readline.get_completer_delims()
            for c in '-/:()\\':
                delims = delims.replace(c, '')
            readline.set_completer_delims(delims)
            
            # Work around trailing space automatically inserted by libreadline
            # until Python gets fixed, see http://bugs.python.org/issue5833
            import ctypes
            lib_name = find_readline_lib()
            if lib_name is not None:
                lib = ctypes.cdll.LoadLibrary(lib_name)
                global rl_completion_suppress_append
                rl_completion_suppress_append = ctypes.c_int.in_dll(lib,
                                            "rl_completion_suppress_append")
        except Exception:
            pass
        self.interactive = False
        if envdir:
            self.env_set(os.path.abspath(envdir))

    def emptyline(self):
        pass

    def onecmd(self, line):
        """`line` may be a `str` or an `unicode` object"""
        try:
            if isinstance(line, str):
                if self.interactive:
                    encoding = sys.stdin.encoding
                else:
                    encoding = locale.getpreferredencoding() # sys.argv
                line = to_unicode(line, encoding)
            if self.interactive:
                line = line.replace('\\', '\\\\')
            rv = cmd.Cmd.onecmd(self, line) or 0
        except SystemExit:
            raise
        except AdminCommandError, e:
            printerr(_("Error: %(msg)s", msg=to_unicode(e)))
            if e.show_usage:
                print
                self.do_help(e.cmd or self.arg_tokenize(line)[0])
            rv = 2
        except TracError, e:
            printerr(exception_to_unicode(e))
            rv = 2
        except Exception, e:
            printerr(exception_to_unicode(e))
            rv = 2
            if self.env_check():
                self.env.log.error("Exception in trac-admin command: %s",
                                   exception_to_unicode(e, traceback=True))
        if not self.interactive:
            return rv

    def run(self):
        self.interactive = True
        printout(_("""Welcome to trac-admin %(version)s
Interactive Trac administration console.
Copyright (C) 2003-2012 Edgewall Software

Type:  '?' or 'help' for help on commands.
        """, version=TRAC_VERSION))
        self.cmdloop()

    ##
    ## Environment methods
    ##

    def env_set(self, envname, env=None):
        self.envname = envname
        self.prompt = "Trac [%s]> " % self.envname
        if env is not None:
            self.__env = env

    def env_check(self):
        if not self.__env:
            try:
                self._init_env()
            except Exception:
                return False
        return True

    @property
    def env(self):
        try:
            if not self.__env:
                self._init_env()
            return self.__env
        except Exception, e:
            printerr(_("Failed to open environment: %(err)s",
                       err=exception_to_unicode(e, traceback=True)))
            sys.exit(1)

    def _init_env(self):
        self.__env = env = Environment(self.envname)
        # fixup language according to env settings
        if has_babel:
            default = env.config.get('trac', 'default_language', '')
            negotiated = get_negotiated_locale([LANG, default])
            if negotiated:
                translation.activate(negotiated)
        
    ##
    ## Utility methods
    ##

    def arg_tokenize(self, argstr):
        """`argstr` is an `unicode` string

        ... but shlex is not unicode friendly.
        """
        lex = shlex(argstr.encode('utf-8'), posix=True)
        lex.whitespace_split = True
        lex.commenters = ''
        if os.name == 'nt':
            lex.escape = ''
        return [unicode(token, 'utf-8') for token in lex] or ['']

    def word_complete(self, text, words):
        words = list(set(a for a in words if a.startswith(text)))
        if len(words) == 1:
            words[0] += ' '     # Only one choice, skip to next arg
        return words

    @staticmethod
    def split_help_text(text):
        import re
        paragraphs = re.split(r'(?m)(?:^[ \t]*\n){1,}', text)
        return [re.sub(r'(?m)\s+', ' ', each.strip())
                for each in paragraphs]
    
    @classmethod
    def print_doc(cls, docs, stream=None, short=False, long=False):
        if stream is None:
            stream = sys.stdout
        docs = [doc for doc in docs if doc[2]]
        if not docs:
            return
        if short:
            max_len = max(len(doc[0]) for doc in docs)
            for (cmd, args, doc) in docs:
                paragraphs = cls.split_help_text(doc)
                console_print(stream, '%s  %s' % (cmd.ljust(max_len), 
                                                  paragraphs[0]))
        else:
            import textwrap
            for (cmd, args, doc) in docs:
                paragraphs = cls.split_help_text(doc)
                console_print(stream, '%s %s\n' % (cmd, args))
                console_print(stream, '    %s\n' % paragraphs[0])
                if (long or len(docs) == 1) and len(paragraphs) > 1:
                    for paragraph in paragraphs[1:]:
                        console_print(stream, textwrap.fill(paragraph, 79, 
                            initial_indent='    ', subsequent_indent='    ')
                            + '\n')

    ##
    ## Command dispatcher
    ##
    
    def complete_line(self, text, line, cmd_only=False):
        if rl_completion_suppress_append is not None:
            rl_completion_suppress_append.value = 1
        args = self.arg_tokenize(line)
        if line and line[-1] == ' ':    # Space starts new argument
            args.append('')
        if self.env_check():
            cmd_mgr = AdminCommandManager(self.env)
            try:
                comp = cmd_mgr.complete_command(args, cmd_only)
            except Exception, e:
                printerr()
                printerr(_('Completion error: %(err)s',
                           err=exception_to_unicode(e)))
                self.env.log.error("trac-admin completion error: %s",
                                   exception_to_unicode(e, traceback=True))
                comp = []
        if len(args) == 1:
            comp.extend(name[3:] for name in self.get_names()
                        if name.startswith('do_'))
        try:
            return comp.complete(text)
        except AttributeError:
            return self.word_complete(text, comp)
        
    def completenames(self, text, line, begidx, endidx):
        return self.complete_line(text, line, True)
        
    def completedefault(self, text, line, begidx, endidx):
        return self.complete_line(text, line)
        
    def default(self, line):
        try:
            if not self.__env:
                self._init_env()
        except TracError, e:
            raise AdminCommandError(to_unicode(e))
        except Exception, e:
            raise AdminCommandError(exception_to_unicode(e))
        args = self.arg_tokenize(line)
        cmd_mgr = AdminCommandManager(self.env)
        return cmd_mgr.execute_command(*args)

    ##
    ## Available Commands
    ##

    ## Help
    _help_help = [('help', '', 'Show documentation')]

    @classmethod
    def all_docs(cls, env=None):
        docs = (cls._help_help + cls._help_initenv)
        if env is not None:
            docs.extend(AdminCommandManager(env).get_command_help())
        return docs

    def complete_help(self, text, line, begidx, endidx):
        return self.complete_line(text, line[5:], True)
        
    def do_help(self, line=None):
        arg = self.arg_tokenize(line)
        if arg[0]:
            doc = getattr(self, "_help_" + arg[0], None)
            if doc is None and self.env_check():
                cmd_mgr = AdminCommandManager(self.env)
                doc = cmd_mgr.get_command_help(arg)
            if doc:
                self.print_doc(doc)
            else:
                printerr(_("No documentation found for '%(cmd)s'",
                           cmd=' '.join(arg)))
        else:
            printout(_("trac-admin - The Trac Administration Console "
                       "%(version)s", version=TRAC_VERSION))
            if not self.interactive:
                print
                printout(_("Usage: trac-admin </path/to/projenv> "
                           "[command [subcommand] [option ...]]\n")
                    )
                printout(_("Invoking trac-admin without command starts "
                           "interactive mode.\n"))
            env = self.env if self.env_check() else None
            self.print_doc(self.all_docs(env), short=True)


    ## Quit / EOF
    _help_quit = [('quit', '', 'Exit the program')]
    _help_exit = _help_quit
    _help_EOF = _help_quit

    def do_quit(self, line):
        print
        sys.exit()

    do_exit = do_quit # Alias
    do_EOF = do_quit # Alias


    ## Initenv
    _help_initenv = [
        ('initenv', '[<projectname> <db> [<repostype> <repospath>]]',
         """Create and initialize a new environment
         
         If no arguments are given, then the required parameters are requested
         interactively.
         
         One or more optional arguments --inherit=PATH can be used to specify
         the "[inherit] file" option at environment creation time, so that only
         the options not already specified in one of the global configuration
         files are written to the conf/trac.ini file of the newly created
         environment. Relative paths are resolved relative to the "conf"
         directory of the new environment.
         """)]

    def do_initdb(self, line):
        self.do_initenv(line)

    def get_initenv_args(self):
        returnvals = []
        printout(_("Creating a new Trac environment at %(envname)s",
                   envname=self.envname))
        printout(_("""
Trac will first ask a few questions about your environment 
in order to initialize and prepare the project database.

 Please enter the name of your project.
 This name will be used in page titles and descriptions.
"""))
        dp = 'My Project'
        returnvals.append(raw_input(_("Project Name [%(default)s]> ",
                                      default=dp)).strip() or dp)
        printout(_(""" 
 Please specify the connection string for the database to use.
 By default, a local SQLite database is created in the environment
 directory. It is also possible to use an already existing
 PostgreSQL database (check the Trac documentation for the exact
 connection string syntax).
"""))
        ddb = 'sqlite:db/trac.db'
        prompt = _("Database connection string [%(default)s]> ", default=ddb)
        returnvals.append(raw_input(prompt).strip() or ddb)
        print
        return returnvals

    def do_initenv(self, line):
        def initenv_error(msg):
            printerr(_("Initenv for '%(env)s' failed.", env=self.envname),
                     "\n" + msg)
        if self.env_check():
            initenv_error(_("Does an environment already exist?"))
            return 2

        if os.path.exists(self.envname) and os.listdir(self.envname):
            initenv_error(_("Directory exists and is not empty."))
            return 2

        if not os.path.exists(os.path.dirname(self.envname)):
            initenv_error(_("Base directory '%(env)s' does not exist. Please "
                            "create it manually and retry.",
                            env=os.path.dirname(self.envname)))
            return 2            

        arg = self.arg_tokenize(line)
        inherit_paths = []
        i = 0
        while i < len(arg):
            item = arg[i]
            if item.startswith('--inherit='):
                inherit_paths.append(arg.pop(i)[10:])
            else:
                i += 1
        arg = arg or [''] # Reset to usual empty in case we popped the only one
        project_name = None
        db_str = None
        repository_type = None
        repository_dir = None
        if len(arg) == 1 and not arg[0]:
            project_name, db_str = self.get_initenv_args()
        elif len(arg) == 2:
            project_name, db_str = arg
        elif len(arg) == 4:
            project_name, db_str, repository_type, repository_dir = arg
        else:
            initenv_error('Wrong number of arguments: %d' % len(arg))
            return 2

        try:
            printout(_("Creating and Initializing Project"))
            options = [
                ('project', 'name', project_name),
                ('trac', 'database', db_str),
            ]
            if repository_dir:
                options.extend([
                    ('trac', 'repository_type', repository_type),
                    ('trac', 'repository_dir', repository_dir),
                ])
            if inherit_paths:
                options.append(('inherit', 'file',
                                ",\n      ".join(inherit_paths)))
            try:
                self.__env = Environment(self.envname, create=True,
                                         options=options)
            except Exception, e:
                initenv_error(_('Failed to create environment.'))
                printerr(e)
                traceback.print_exc()
                sys.exit(1)

            # Add a few default wiki pages
            printout(_(" Installing default wiki pages"))
            pages_dir = pkg_resources.resource_filename('trac.wiki', 
                                                        'default-pages') 
            WikiAdmin(self.__env).load_pages(pages_dir)

            if repository_dir:
                try:
                    repos = RepositoryManager(self.__env).get_repository('')
                    if repos:
                        printout(_(" Indexing default repository"))
                        repos.sync(self._resync_feedback)
                except TracError, e:
                    printerr(_("""
---------------------------------------------------------------------
Warning: couldn't index the default repository.

This can happen for a variety of reasons: wrong repository type, 
no appropriate third party library for this repository type,
no actual repository at the specified repository path...

You can nevertheless start using your Trac environment, but 
you'll need to check again your trac.ini file and the [trac] 
repository_type and repository_path settings.
"""))
        except Exception, e:
            initenv_error(to_unicode(e))
            traceback.print_exc()
            return 2

        printout(_("""
---------------------------------------------------------------------
Project environment for '%(project_name)s' created.

You may now configure the environment by editing the file:

  %(config_path)s

If you'd like to take this new project environment for a test drive,
try running the Trac standalone web server `tracd`:

  tracd --port 8000 %(project_path)s

Then point your browser to http://localhost:8000/%(project_dir)s.
There you can also browse the documentation for your installed
version of Trac, including information on further setup (such as
deploying Trac to a real web server).

The latest documentation can also always be found on the project
website:

  http://trac.edgewall.org/

Congratulations!
""", project_name=project_name, project_path=self.envname,
           project_dir=os.path.basename(self.envname),
           config_path=os.path.join(self.envname, 'conf', 'trac.ini')))

    def _resync_feedback(self, rev):
        sys.stdout.write(' [%s]\r' % rev)
        sys.stdout.flush()
        

class TracAdminHelpMacro(WikiMacroBase):
    _domain = 'messages'
    _description = cleandoc_(
    """Display help for trac-admin commands.

    Examples:
    {{{
    [[TracAdminHelp]]               # all commands
    [[TracAdminHelp(wiki)]]         # all wiki commands
    [[TracAdminHelp(wiki export)]]  # the "wiki export" command
    [[TracAdminHelp(upgrade)]]      # the upgrade command
    }}}
    """)

    def expand_macro(self, formatter, name, content):
        if content:
            arg = content.strip().split()
            doc = getattr(TracAdmin, "_help_" + arg[0], None)
            if doc is None:
                cmd_mgr = AdminCommandManager(self.env)
                doc = cmd_mgr.get_command_help(arg)
            if not doc:
                raise TracError('Unknown trac-admin command "%s"' % content)
        else:
            doc = TracAdmin.all_docs(self.env)
        buf = StringIO.StringIO()
        TracAdmin.print_doc(doc, buf, long=True)
        return html.PRE(buf.getvalue(), class_='wiki')


def run(args=None):
    """Main entry point."""
    if args is None:
        args = sys.argv[1:]
    locale = None
    if has_babel:
        import babel
        try:
            locale = get_negotiated_locale([LANG]) or babel.Locale.default()
        except babel.UnknownLocaleError:
            pass
        translation.activate(locale)
    admin = TracAdmin()
    if len(args) > 0:
        if args[0] in ('-h', '--help', 'help'):
            return admin.onecmd(' '.join(['help'] + args[1:]))
        elif args[0] in ('-v','--version'):
            printout(os.path.basename(sys.argv[0]), TRAC_VERSION)
        else:
            env_path = os.path.abspath(args[0])
            try:
                unicode(env_path, 'ascii')
            except UnicodeDecodeError:
                printerr(_("Non-ascii environment path '%(path)s' not "
                           "supported.", path=to_unicode(env_path)))
                sys.exit(2)
            admin.env_set(env_path)
            if len(args) > 1:
                s_args = ' '.join(["'%s'" % c for c in args[2:]])
                command = args[1] + ' ' +s_args
                return admin.onecmd(command)
            else:
                while True:
                    try:
                        admin.run()
                    except KeyboardInterrupt:
                        admin.do_quit('')
    else:
        return admin.onecmd("help")


if __name__ == '__main__':
    pkg_resources.require('Trac==%s' % VERSION)
    sys.exit(run())
