##############################################################################
#
# Copyright (c) 2002 Zope Foundation and Contributors.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE
#
##############################################################################
"""System management components"""

from cgi import escape
from cStringIO import StringIO
from logging import getLogger
import os
import sys
import time
import urllib

from AccessControl.class_init import InitializeClass
from AccessControl.requestmethod import requestmethod
from AccessControl.SecurityManagement import getSecurityManager
from Acquisition import Implicit
from App.CacheManager import CacheManager
from App.config import getConfiguration
from App.DavLockManager import DavLockManager
from App.special_dtml import DTMLFile
from App.Undo import UndoSupport
from App.version_txt import version_txt
from DateTime.DateTime import DateTime
from Lifetime import shutdown
from OFS.Folder import Folder
from OFS.SimpleItem import Item
from OFS.SimpleItem import SimpleItem
from Product import ProductFolder
from Products.PageTemplates.PageTemplateFile import PageTemplateFile
from zExceptions import Redirect
from ZPublisher import Publish

LOG = getLogger('ApplicationManager')

try:
    from thread import get_ident
except ImportError:
    def get_ident():
        return 0


class DatabaseManager(Item, Implicit):
    """Database management (legacy)
    """
    manage = manage_main = DTMLFile('dtml/dbMain', globals())
    manage_main._setName('manage_main')
    id = 'DatabaseManagement'
    name = title = 'Database Management'
    meta_type = 'Database Management'
    icon = 'p_/DatabaseManagement_icon'

    manage_options=((
        {'label':'Database', 'action':'manage_main'},
        {'label':'Activity', 'action':'manage_activity'},
        {'label':'Cache Parameters', 'action':'manage_cacheParameters'},
        {'label':'Flush Cache', 'action':'manage_cacheGC'},
        ))

    # These need to be here rather to make tabs work correctly. This
    # needs to be revisited.
    manage_activity = DTMLFile('dtml/activity', globals())
    manage_cacheParameters = DTMLFile('dtml/cacheParameters', globals())
    manage_cacheGC = DTMLFile('dtml/cacheGC', globals())

InitializeClass(DatabaseManager)


class FakeConnection:
    # Supports the methods of Connection that CacheManager needs

    def __init__(self, db, parent_jar):
        self._db = db

    def db(self):
        return self._db


class DatabaseChooser(SimpleItem):
    """ Choose which database to view
    """
    meta_type = 'Database Management'
    name = title = 'Database Management'
    icon = 'p_/DatabaseManagement_icon'
    isPrincipiaFolderish = 1

    manage_options=(
        {'label':'Databases', 'action':'manage_main'},
        )

    manage_main = PageTemplateFile('www/chooseDatabase.pt', globals())

    def __init__(self, id):
        self.id = id

    def getDatabaseNames(self, quote=False):
        configuration = getConfiguration()
        names = configuration.dbtab.listDatabaseNames()
        names.sort()
        if quote:
            return [(name, urllib.quote(name)) for name in names]
        return names

    def __getitem__(self, name):
        configuration = getConfiguration()
        db = configuration.dbtab.getDatabase(name=name)
        m = AltDatabaseManager()
        m.id = name
        m._p_jar = FakeConnection(db, self.getPhysicalRoot()._p_jar)
        return m.__of__(self)

    def __bobo_traverse__(self, request, name):
        configuration = getConfiguration()
        if configuration.dbtab.hasDatabase(name):
            return self[name]
        return getattr(self, name)

    def tpValues(self):
        names = self.getDatabaseNames()
        res = []
        for name in names:
            m = AltDatabaseManager()
            m.id = name
            # Avoid opening the database just for the tree widget.
            m._p_jar = None
            res.append(m.__of__(self))
        return res

InitializeClass(DatabaseChooser)


# refcount snapshot info
_v_rcs = None
_v_rst = None

class DebugManager(Item, Implicit):
    """ Debug and profiling information
    """
    manage = manage_main = DTMLFile('dtml/debug', globals())
    manage_main._setName('manage_main')
    id ='DebugInfo'
    name = title = 'Debug Information'
    meta_type = name
    icon = 'p_/DebugManager_icon'

    manage_options=((
        {'label':'Debugging Info', 'action':'manage_main'},
        {'label':'Profiling', 'action':'manage_profile'},
        ))

    manage_debug = DTMLFile('dtml/debug', globals())

    def refcount(self, n=None, t=(type(Implicit), )):
        # return class reference info
        counts = {}
        for m in sys.modules.values():
            for sym in dir(m):
                ob = getattr(m, sym)
                if type(ob) in t:
                    counts[ob] = sys.getrefcount(ob)
        pairs = []
        for ob, v in counts.items():
            if hasattr(ob, '__module__'):
                name = '%s.%s' % (ob.__module__, ob.__name__)
            else:
                name = '%s' % ob.__name__
            pairs.append((v, name))
        pairs.sort()
        pairs.reverse()
        if n is not None:
            pairs = pairs[:n]
        return pairs

    def refdict(self):
        counts = {}
        for v, n in self.refcount():
            counts[n] = v
        return counts

    def rcsnapshot(self):
        global _v_rcs
        global _v_rst
        _v_rcs = self.refdict()
        _v_rst = DateTime()

    def rcdate(self):
        return _v_rst

    def rcdeltas(self):
        if _v_rcs is None:
            self.rcsnapshot()
        nc = self.refdict()
        rc = _v_rcs
        rd = []
        for n, c in nc.items():
            try:
                prev = rc.get(n, 0)
                if c > prev:
                    rd.append((c - prev, (c, prev, n)))
            except Exception:
                pass
        rd.sort()
        rd.reverse()
        return [{'name': n[1][2],
                 'delta': n[0],
                 'pc': n[1][1],
                 'rc': n[1][0],
                } for n in rd]

    def dbconnections(self):
        import Globals  # for data
        return Globals.DB.connectionDebugInfo()


    # Profiling support

    manage_profile = DTMLFile('dtml/profile', globals())

    def manage_profile_stats(self, sort='time',
                             limit=200, stripDirs=1, mode='stats'):
        """Return profile data if available
        """
        stats = getattr(sys, '_ps_', None)
        if stats is None:
            return None
        if stripDirs:
            from copy import copy
            stats = copy(stats)
            stats.strip_dirs()
        stats.sort_stats(sort)
        stats.stream = output = StringIO()
        getattr(stats, 'print_%s' % mode)(limit)
        return output.getvalue()

    def manage_profile_reset(self):
        """ Reset profile data
        """
        Publish._pstat = sys._ps_ = None

    def manage_getSysPath(self):
        return list(sys.path)

InitializeClass(DebugManager)




class ApplicationManager(Folder,CacheManager):
    """System management
    """
    __roles__ = ('Manager',)
    isPrincipiaFolderish = 1
    Database = DatabaseChooser('Database') #DatabaseManager()
    DebugInfo = DebugManager()
    DavLocks = DavLockManager()

    manage = manage_main = DTMLFile('dtml/cpContents', globals())
    manage_main._setName('manage_main')

    _objects=(
        {'id': 'Database',
         'meta_type': Database.meta_type},
        {'id': 'DavLocks',
         'meta_type': DavLocks.meta_type},
        {'id': 'Products',
         'meta_type': 'Product Management'},
        {'id': 'DebugInfo',
         'meta_type': DebugInfo.meta_type},
        )

    manage_options=(
        ({'label':'Contents', 'action':'manage_main'}, ) +
        UndoSupport.manage_options
        )

    id = 'Control_Panel'
    name = title = 'Control Panel'
    meta_type = 'Control Panel'
    icon = 'p_/ControlPanel_icon'

    process_id = os.getpid()
    process_start = int(time.time())

    # Disable some inappropriate operations
    manage_addObject = None
    manage_delObjects = None
    manage_addProperty = None
    manage_editProperties = None
    manage_delProperties = None

    def __init__(self):
        self.Products = ProductFolder()

    def _canCopy(self, op=0):
        return 0

    def _init(self):
        pass

    def version_txt(self):
        if not hasattr(self, '_v_version_txt'):
            self._v_version_txt = version_txt()

        return self._v_version_txt

    def sys_version(self):
        return sys.version

    def sys_platform(self):
        return sys.platform

    def manage_app(self, URL2):
        """Return to the main management screen"""
        raise Redirect, URL2+'/manage'

    def process_time(self, _when=None):
        if _when is None:
            _when = time.time()
        s = int(_when) - self.process_start
        d = int(s / 86400)
        s = s - (d * 86400)
        h = int(s / 3600)
        s = s -(h * 3600)
        m = int(s / 60)
        s = s - (m * 60)
        d = d and ('%d day%s' % (d, (d != 1 and 's' or ''))) or ''
        h = h and ('%d hour%s' % (h, (h != 1 and 's' or ''))) or ''
        m = m and ('%d min' % m) or ''
        s = '%d sec' % s
        return '%s %s %s %s' % (d, h, m, s)

    def thread_get_ident(self):
        return get_ident()

    def db_name(self):
        return self._p_jar.db().getName()

    def db_size(self):
        s = self._p_jar.db().getSize()
        if type(s) is str:
            return s

        if s >= 1048576.0:
            return '%.1fM' % (s/1048576.0)
        return '%.1fK' % (s/1024.0)

    if 'ZMANAGED' in os.environ:
        manage_restartable = 1
        @requestmethod('POST')
        def manage_restart(self, URL1, REQUEST=None):
            """ Shut down the application for restart.
            """
            try:
                user = '"%s"' % getSecurityManager().getUser().getUserName()
            except:
                user = 'unknown user'
            LOG.info("Restart requested by %s" % user)
            shutdown(1)
            return """<html>
            <head><meta HTTP-EQUIV=REFRESH CONTENT="10; URL=%s/manage_main">
            </head>
            <body>Zope is restarting</body></html>
            """ % escape(URL1, 1)

    @requestmethod('POST')
    def manage_shutdown(self, REQUEST=None):
        """Shut down the application"""
        try:
            user = '"%s"' % getSecurityManager().getUser().getUserName()
        except:
            user = 'unknown user'
        LOG.info("Shutdown requested by %s" % user)
        shutdown(0)
        return """<html>
        <head>
        </head>
        <body>Zope is shutting down</body></html>
        """

    @requestmethod('POST')
    def manage_pack(self, days=0, REQUEST=None, _when=None):
        """Pack the database"""

        if _when is None:
            _when = time.time()

        t = _when - (days * 86400)

        db = self._p_jar.db()
        t = db.pack(t)
        if REQUEST is not None:
            REQUEST['RESPONSE'].redirect(
                REQUEST['URL1'] + '/manage_workspace')
        return t

    def revert_points(self):
        return ()

    def version_list(self):
        # Return a list of currently installed products/versions
        cfg = getConfiguration()
        product_dir = os.path.join(cfg.softwarehome,'Products')
        product_names = os.listdir(product_dir)
        product_names.sort()
        info = []
        for product_name in product_names:
            package_dir = os.path.join(product_dir, product_name)
            if not os.path.isdir(package_dir):
                continue
            version_txt = None
            for name in ('VERSION.TXT', 'VERSION.txt', 'version.txt'):
                v = os.path.join(package_dir, name)
                if os.path.exists(v):
                    version_txt = v
                    break
            if version_txt is not None:
                file = open(version_txt, 'r')
                data = file.readline()
                file.close()
                info.append(data.strip())
        return info

    def getSOFTWARE_HOME(self):
        cfg = getConfiguration()
        return getattr(cfg, 'softwarehome', None)

    def getZOPE_HOME(self):
        cfg = getConfiguration()
        return getattr(cfg, 'zopehome', None)

    def getINSTANCE_HOME(self):
        return getConfiguration().instancehome

    def getCLIENT_HOME(self):
        return getConfiguration().clienthome

    def getServers(self):
        # used only for display purposes
        # return a sequence of two-tuples.  The first element of
        # each tuple is the service name, the second is a string repr. of
        # the port/socket/other on which it listens
        from asyncore import socket_map
        l = []
        for k,v in socket_map.items():
            # this is only an approximation
            if hasattr(v, 'port'):
                type = str(getattr(v, '__class__', 'unknown'))
                port = v.port
                l.append((str(type), 'Port: %s' % port))
        return l

    def objectIds(self, spec=None):
        """ this is a patch for pre-2.4 Zope installations. Such
            installations don't have an entry for the WebDAV LockManager
            introduced in 2.4.
        """

        meta_types = [x.get('meta_type', None) for x in self._objects]

        if not self.DavLocks.meta_type in meta_types:

            lst = list(self._objects)
            lst.append({'id': 'DavLocks', 
                        'meta_type': self.DavLocks.meta_type})
            self._objects = tuple(lst)

        return Folder.objectIds(self, spec)

class AltDatabaseManager(DatabaseManager, CacheManager):
    """ Database management DBTab-style
    """
    db_name = ApplicationManager.db_name.im_func
    db_size = ApplicationManager.db_size.im_func
    manage_pack = ApplicationManager.manage_pack.im_func

