'''Implement an in-memory hyperdb for testing purposes.
'''

import shutil
import os
import time

from roundup import date
from roundup import hyperdb
from roundup import roundupdb
from roundup import security
from roundup import password
from roundup import configuration
from roundup.backends import back_anydbm
from roundup.backends import indexer_dbm
from roundup.backends import sessions_dbm
from roundup.backends import indexer_common
from roundup.support import ensureParentsExist
from roundup.anypy.strings import s2b
from roundup.test.tx_Source_detector import init as tx_Source_init

default_prefix = '../../share/roundup/templates/classic'


def new_config(debug=False, prefix=default_prefix):
    if not prefix.startswith('/'):
        prefix = os.path.join(os.path.dirname(__file__), prefix)
    config = configuration.CoreConfig()
    config.detectors = configuration.UserConfig(
        os.path.join(prefix, "detectors/config.ini"))
    config.ext = configuration.UserConfig(
        os.path.join(prefix, "extensions/config.ini"))
    config.DATABASE = "db"
    # config.logging = MockNull()
    # these TRACKER_WEB and MAIL_DOMAIN values are used in mailgw tests
    if debug:
        config.LOGGING_LEVEL = "DEBUG"
    config.MAIL_DOMAIN = "your.tracker.email.domain.example"
    config.TRACKER_WEB = "http://tracker.example/cgi-bin/roundup.cgi/bugs/"
    return config


def create(journaltag, create=True, debug=False, prefix=default_prefix):
    # "Nuke" in-memory db
    db_nuke('')

    db = Database(new_config(debug), journaltag)

    # load standard schema
    if not prefix.startswith('/'):
        prefix = os.path.join(os.path.dirname(__file__), prefix)

    schema = os.path.join(prefix, 'schema.py')
    vars = hyperdb.__dict__
    vars['Class'] = Class
    vars['FileClass'] = FileClass
    vars['IssueClass'] = IssueClass
    vars['db'] = db
    fd = open(schema)
    exec(compile(fd.read(), schema, 'exec'), vars)
    fd.close()

    initial_data = os.path.join(prefix, 'initial_data.py')
    vars = dict(db=db, admin_email='admin@test.com',
                adminpw=password.Password('sekrit', config=db.config))
    fd = open(initial_data)
    exec(compile(fd.read(), initial_data, 'exec'), vars)
    fd.close()

    # load standard detectors
    dirname = os.path.join(prefix, 'detectors')
    for fn in os.listdir(dirname):
        if not fn.endswith('.py'): continue                       # noqa: E701
        vars = {}
        with open(os.path.join(dirname, fn)) as fd:
            exec(compile(fd.read(),
                         os.path.join(dirname, fn), 'exec'), vars)
        vars['init'](db)

    tx_Source_init(db)

    '''
    status = Class(db, "status", name=String())
    status.setkey("name")
    priority = Class(db, "priority", name=String(), order=String())
    priority.setkey("name")
    keyword = Class(db, "keyword", name=String(), order=String())
    keyword.setkey("name")
    user = Class(db, "user", username=String(), password=Password(),
        assignable=Boolean(), age=Number(), roles=String(), address=String(),
        supervisor=Link('user'),realname=String(),alternate_addresses=String())
    user.setkey("username")
    file = FileClass(db, "file", name=String(), type=String(),
        comment=String(indexme="yes"), fooz=Password())
    file_nidx = FileClass(db, "file_nidx", content=String(indexme='no'))
    issue = IssueClass(db, "issue", title=String(indexme="yes"),
        status=Link("status"), nosy=Multilink("user"), deadline=Date(),
        foo=Interval(), files=Multilink("file"), assignedto=Link('user'),
        priority=Link('priority'), spam=Multilink('msg'),
        feedback=Link('msg'))
    stuff = Class(db, "stuff", stuff=String())
    session = Class(db, 'session', title=String())
    msg = FileClass(db, "msg", date=Date(),
                           author=Link("user", do_journal='no'),
                           files=Multilink('file'), inreplyto=String(),
                           messageid=String(), summary=String(),
                           content=String(),
                           recipients=Multilink("user", do_journal='no')
                           )
    '''
    if create:
        db.user.create(username="fred", roles='User',
                       password=password.Password('sekrit',
                                                  config=db.config),
                       address='fred@example.com')

    db.security.addPermissionToRole('User', 'Email Access')
    '''
    db.security.addPermission(name='Register', klass='user')
    db.security.addPermissionToRole('User', 'Web Access')
    db.security.addPermissionToRole('Anonymous', 'Email Access')
    db.security.addPermissionToRole('Anonymous', 'Register', 'user')
    for cl in 'issue', 'file', 'msg', 'keyword':
        db.security.addPermissionToRole('User', 'View', cl)
        db.security.addPermissionToRole('User', 'Edit', cl)
        db.security.addPermissionToRole('User', 'Create', cl)
    for cl in 'priority', 'status':
        db.security.addPermissionToRole('User', 'View', cl)
    '''
    return db


class cldb(dict):
    def __init__(self, **values):
        super(cldb, self).__init__()
        for key, value in values.items():
            super(cldb, self).__setitem__(s2b(key), value)

    def __getitem__(self, key):
        return super(cldb, self).__getitem__(s2b(key))

    def __setitem__(self, key, value):
        return super(cldb, self).__setitem__(s2b(key), value)

    def __delitem__(self, key):
        return super(cldb, self).__delitem__(s2b(key))

    def __contains__(self, key):
        return super(cldb, self).__contains__(s2b(key))

    def close(self):
        pass


class BasicDatabase(dict):
    ''' Provide a nice encapsulation of an anydbm store.

        Keys are id strings, values are automatically marshalled data.
    '''
    def __init__(self, **values):
        super(BasicDatabase, self).__init__()
        for k, v in values.items():
            super(BasicDatabase, self).__setitem__(s2b(k), v)

    def __getitem__(self, key):
        if key not in self:
            d = self[key] = {}
            return d
        return super(BasicDatabase, self).__getitem__(s2b(key))

    def __setitem__(self, key, value):
        return super(BasicDatabase, self).__setitem__(s2b(key), value)

    def __delitem__(self, key):
        return super(BasicDatabase, self).__delitem__(s2b(key))

    def __contains__(self, key):
        return super(BasicDatabase, self).__contains__(s2b(key))

    def exists(self, infoid):
        return infoid in self
    _marker = []

    def get(self, infoid, value, default=_marker):
        if infoid not in self:
            if default is self._marker:
                raise KeyError
            else:
                return default
        return self[infoid].get(value, default)

    def getall(self, infoid):
        if infoid not in self:
            raise KeyError(infoid)
        return self[infoid]

    def set(self, infoid, **newvalues):
        if '__timestamp' in newvalues:
            try:
                float(newvalues['__timestamp'])
            except ValueError:
                if infoid in self:
                    del(newvalues['__timestamp'])
                else:
                    newvalues['__timestamp'] = time.time()
        self[infoid].update(newvalues)

    def list(self):
        return list(self.keys())

    def destroy(self, infoid):
        del self[infoid]

    def commit(self):
        pass

    def close(self):
        pass

    def updateTimestamp(self, sessid):
        sess = self.get(sessid, '__timestamp', None)
        now = time.time()
        if sess is None or now > sess + 60:
            self.set(sessid, __timestamp=now)

    def clean(self):
        pass


class Sessions(BasicDatabase, sessions_dbm.Sessions):
    name = 'sessions'


class OneTimeKeys(BasicDatabase, sessions_dbm.OneTimeKeys):
    name = 'otks'


class Indexer(indexer_dbm.Indexer):
    def __init__(self, db):
        indexer_common.Indexer.__init__(self, db)
        self.reindex = 0
        self.quiet = 9
        self.changed = 0

    def load_index(self, reload=0, wordlist=None):
        # Unless reload is indicated, do not load twice
        if self.index_loaded() and not reload:
            return 0
        self.words = {}
        self.files = {'_TOP': (0, None)}
        self.fileids = {}
        self.changed = 0

    def save_index(self):
        pass

    def force_reindex(self):
        # TODO I'm concerned that force_reindex may not be tested by
        # testForcedReindexing if the functionality can just be removed
        pass


class Database(back_anydbm.Database):
    """A database for storing records containing flexible data types.

    Transaction stuff TODO:

    - check the timestamp of the class file and nuke the cache if it's
      modified. Do some sort of conflict checking on the dirty stuff.
    - perhaps detect write collisions (related to above)?
    """

    dbtype = "memorydb"

    # Make it a little more persistent across re-open
    memdb = {}

    def __init__(self, config, journaltag=None):
        self.config, self.journaltag = config, journaltag
        self.classes = {}
        self.files = {}
        self.tx_files = {}
        self.security = security.Security(self)
        self.stats = {'cache_hits': 0, 'cache_misses': 0, 'get_items': 0,
                      'filtering': 0}
        self.sessions = Sessions()
        self.otks = OneTimeKeys()
        self.indexer = Indexer(self)
        roundupdb.Database.__init__(self)

        # anydbm bits
        self.cache = {}           # cache of nodes loaded or created
        self.dirtynodes = {}      # keep track of the dirty nodes by class
        self.newnodes = {}        # keep track of the new nodes by class
        self.destroyednodes = {}  # keep track of the destroyed nodes by class
        self.transactions = []
        self.tx_Source = None
        # persistence across re-open
        self.items = self.__class__.memdb.get('items', {})
        self.ids = self.__class__.memdb.get('ids', {})
        self.journals = self.__class__.memdb.get('journals', {})

    def filename(self, classname, nodeid, property=None, create=0):
        shutil.copyfile(__file__, __file__+'.dummy')
        return __file__+'.dummy'

    def filesize(self, classname, nodeid, property=None, create=0):
        return len(self.getfile(classname, nodeid, property))

    def post_init(self):
        super(Database, self).post_init()

    def refresh_database(self):
        pass

    def getSessionManager(self):
        return self.sessions

    def getOTKManager(self):
        return self.otks

    def reindex(self, classname=None, show_progress=False):
        pass

    def __repr__(self):
        return '<memorydb instance at %x>' % id(self)

    def storefile(self, classname, nodeid, property, content):
        if isinstance(content, str):
            content = s2b(content)
        self.tx_files[classname, nodeid, property] = content
        self.transactions.append((self.doStoreFile, (classname, nodeid,
                                                     property)))

    def getfile(self, classname, nodeid, property):
        if (classname, nodeid, property) in self.tx_files:
            return self.tx_files[classname, nodeid, property]
        return self.files[classname, nodeid, property]

    def doStoreFile(self, classname, nodeid, property, **databases):
        self.files[classname, nodeid, property] = self.tx_files[classname, nodeid, property]
        return (classname, nodeid)

    def rollbackStoreFile(self, classname, nodeid, property, **databases):
        del self.tx_files[classname, nodeid, property]

    def numfiles(self):
        return len(self.files) + len(self.tx_files)

    def close(self):
        self.clearCache()
        self.tx_files = {}
        # kill the schema too
        self.classes = {}
        # just keep the .items
        # persistence across re-open
        self.__class__.memdb['items'] = self.items
        self.__class__.memdb['ids'] = self.ids
        self.__class__.memdb['journals'] = self.journals

    #
    # Classes
    #
    def __getattr__(self, classname):
        """A convenient way of calling self.getclass(classname)."""
        if classname in self.classes:
            return self.classes[classname]
        raise AttributeError(classname)

    def addclass(self, cl):
        cn = cl.classname
        if cn in self.classes:
            raise ValueError('Class "%s" already defined.' % cn)
        self.classes[cn] = cl
        if cn not in self.items:
            self.items[cn] = cldb()
            self.ids[cn] = 0

        # add default Edit and View permissions
        self.security.addPermission(name="Create", klass=cn,
                                    description="User is allowed to create " +
                                    cn)
        self.security.addPermission(name="Edit", klass=cn,
                                    description="User is allowed to edit " +
                                    cn)
        self.security.addPermission(name="View", klass=cn,
                                    description="User is allowed to access " +
                                    cn)

    def getclasses(self):
        """Return a list of the names of all existing classes."""
        return sorted(self.classes.keys())

    def getclass(self, classname):
        """Get the Class object representing a particular class.

        If 'classname' is not a valid class name, a KeyError is raised.
        """
        try:
            return self.classes[classname]
        except KeyError:
            raise KeyError('There is no class called "%s"' % classname)

    #
    # Class DBs
    #
    def clear(self):
        self.items = {}

    def getclassdb(self, classname, mode='r'):
        """ grab a connection to the class db that will be used for
            multiple actions
        """
        return self.items[classname]

    def getCachedJournalDB(self, classname):
        return self.journals.setdefault(classname, {})

    #
    # Node IDs
    #
    def newid(self, classname):
        self.ids[classname] += 1
        return str(self.ids[classname])

    def setid(self, classname, id):
        self.ids[classname] = int(id)

    #
    # Journal
    #
    def doSaveJournal(self, classname, nodeid, action, params, creator,
                      creation):
        if creator is None:
            creator = self.getuid()
        if creation is None:
            creation = date.Date()
        self.journals.setdefault(classname, {}).setdefault(
            nodeid, []).append((nodeid, creation, creator, action, params))

    def doSetJournal(self, classname, nodeid, journal):
        self.journals.setdefault(classname, {})[nodeid] = journal

    def getjournal(self, classname, nodeid):
        # our journal result
        res = []

        # add any journal entries for transactions not committed to the
        # database
        for method, args in self.transactions:
            if method != self.doSaveJournal:
                continue
            (cache_classname, cache_nodeid, cache_action, cache_params,
                cache_creator, cache_creation) = args
            if cache_classname == classname and cache_nodeid == nodeid:
                if not cache_creator:
                    cache_creator = self.getuid()
                if not cache_creation:
                    cache_creation = date.Date()
                res.append((cache_nodeid, cache_creation, cache_creator,
                            cache_action, cache_params))
        try:
            res += self.journals.get(classname, {})[nodeid]
        except KeyError:
            if res: return res                                     # noqa: E701
            raise IndexError(nodeid)
        return res

    def pack(self, pack_before):
        """ Delete all journal entries except "create" before 'pack_before'.
        """
        pack_before = pack_before.serialise()
        for classname in self.journals:
            db = self.journals[classname]
            for key in db:
                # get the journal for this db entry
                kept_journals = []
                for entry in db[key]:
                    # unpack the entry
                    (nodeid, date_stamp, self.journaltag, action,
                     params) = entry
                    date_stamp = date_stamp.serialise()
                    # if the entry is after the pack date, _or_ the initial
                    # create entry, then it stays
                    if date_stamp > pack_before or action == 'create':
                        kept_journals.append(entry)
                db[key] = kept_journals


class Class(back_anydbm.Class):
    pass


class FileClass(back_anydbm.FileClass):
    def __init__(self, db, classname, **properties):
        if 'content' not in properties:
            properties['content'] = hyperdb.String(indexme='yes')
        if 'type' not in properties:
            properties['type'] = hyperdb.String()
        back_anydbm.Class.__init__(self, db, classname, **properties)

    def export_files(self, dirname, nodeid):
        dest = self.exportFilename(dirname, nodeid)
        ensureParentsExist(dest)
        f = open(dest, 'wb')
        f.write(self.db.files[self.classname, nodeid, None])
        f.close()

    def import_files(self, dirname, nodeid):
        source = self.exportFilename(dirname, nodeid)
        f = open(source, 'rb')
        self.db.files[self.classname, nodeid, None] = f.read()
        f.close()
        mime_type = None
        props = self.getprops()
        if 'type' in props:
            mime_type = self.get(nodeid, 'type')
        if not mime_type:
            mime_type = self.default_mime_type
        if props['content'].indexme:
            self.db.indexer.add_text((self.classname, nodeid, 'content'),
                                     self.get(nodeid, 'content'), mime_type)


# deviation from spec - was called ItemClass
class IssueClass(Class, roundupdb.IssueClass):
    # Overridden methods:
    def __init__(self, db, classname, **properties):
        """The newly-created class automatically includes the "messages",
        "files", "nosy", and "superseder" properties.  If the 'properties'
        dictionary attempts to specify any of these properties or a
        "creation" or "activity" property, a ValueError is raised.
        """
        if 'title' not in properties:
            properties['title'] = hyperdb.String(indexme='yes')
        if 'messages' not in properties:
            properties['messages'] = hyperdb.Multilink("msg")
        if 'files' not in properties:
            properties['files'] = hyperdb.Multilink("file")
        if 'nosy' not in properties:
            # note: journalling is turned off as it really just wastes
            # space. this behaviour may be overridden in an instance
            properties['nosy'] = hyperdb.Multilink("user", do_journal="no")
        if 'superseder' not in properties:
            properties['superseder'] = hyperdb.Multilink(classname)
        Class.__init__(self, db, classname, **properties)

# Methods to check for existence and nuke the db
# We don't support multiple named databases


def db_exists(name):
    return bool(Database.memdb)


def db_nuke(name):
    Database.memdb = {}

# vim: set et sts=4 sw=4 :
