import threading
import typing

from hydrus.core import HydrusData
from hydrus.core import HydrusExceptions
from hydrus.core import HydrusGlobals as HG
from hydrus.core import HydrusSerialisable
from hydrus.core import HydrusTags

from hydrus.client import ClientSearch

CLIENT_API_PERMISSION_ADD_URLS = 0
CLIENT_API_PERMISSION_ADD_FILES = 1
CLIENT_API_PERMISSION_ADD_TAGS = 2
CLIENT_API_PERMISSION_SEARCH_FILES = 3
CLIENT_API_PERMISSION_MANAGE_PAGES = 4
CLIENT_API_PERMISSION_MANAGE_HEADERS = 5
CLIENT_API_PERMISSION_MANAGE_DATABASE = 6
CLIENT_API_PERMISSION_ADD_NOTES = 7
CLIENT_API_PERMISSION_MANAGE_FILE_RELATIONSHIPS = 8

ALLOWED_PERMISSIONS = ( CLIENT_API_PERMISSION_ADD_FILES, CLIENT_API_PERMISSION_ADD_TAGS, CLIENT_API_PERMISSION_ADD_URLS, CLIENT_API_PERMISSION_SEARCH_FILES, CLIENT_API_PERMISSION_MANAGE_PAGES, CLIENT_API_PERMISSION_MANAGE_HEADERS, CLIENT_API_PERMISSION_MANAGE_DATABASE, CLIENT_API_PERMISSION_ADD_NOTES, CLIENT_API_PERMISSION_MANAGE_FILE_RELATIONSHIPS )

basic_permission_to_str_lookup = {}

basic_permission_to_str_lookup[ CLIENT_API_PERMISSION_ADD_URLS ] = 'import and edit urls'
basic_permission_to_str_lookup[ CLIENT_API_PERMISSION_ADD_FILES ] = 'import and delete files'
basic_permission_to_str_lookup[ CLIENT_API_PERMISSION_ADD_TAGS ] = 'edit file tags'
basic_permission_to_str_lookup[ CLIENT_API_PERMISSION_SEARCH_FILES ] = 'search and fetch files'
basic_permission_to_str_lookup[ CLIENT_API_PERMISSION_MANAGE_PAGES ] = 'manage pages'
basic_permission_to_str_lookup[ CLIENT_API_PERMISSION_MANAGE_HEADERS ] = 'manage cookies and headers'
basic_permission_to_str_lookup[ CLIENT_API_PERMISSION_MANAGE_DATABASE ] = 'manage database'
basic_permission_to_str_lookup[ CLIENT_API_PERMISSION_ADD_NOTES ] = 'edit file notes'
basic_permission_to_str_lookup[ CLIENT_API_PERMISSION_MANAGE_FILE_RELATIONSHIPS ] = 'manage file relationships'

SEARCH_RESULTS_CACHE_TIMEOUT = 4 * 3600

SESSION_EXPIRY = 86400

api_request_dialog_open = False
last_api_permissions_request = None

class APIManager( HydrusSerialisable.SerialisableBase ):
    
    SERIALISABLE_TYPE = HydrusSerialisable.SERIALISABLE_TYPE_CLIENT_API_MANAGER
    SERIALISABLE_NAME = 'Client API Manager'
    SERIALISABLE_VERSION = 1
    
    def __init__( self ):
        
        HydrusSerialisable.SerialisableBase.__init__( self )
        
        self._dirty = False
        
        self._access_keys_to_permissions = {}
        
        self._session_keys_to_access_keys_and_expirys = {}
        
        self._lock = threading.Lock()
        
        HG.client_controller.sub( self, 'MaintainMemory', 'memory_maintenance_pulse' )
        
    
    def _GetSerialisableInfo( self ):
        
        serialisable_api_permissions_objects = [ api_permissions.GetSerialisableTuple() for api_permissions in self._access_keys_to_permissions.values() ]
        
        return serialisable_api_permissions_objects
        
    
    def _InitialiseFromSerialisableInfo( self, serialisable_info ):
        
        serialisable_api_permissions_objects = serialisable_info
        
        api_permissions_objects = [ HydrusSerialisable.CreateFromSerialisableTuple( serialisable_api_permissions ) for serialisable_api_permissions in serialisable_api_permissions_objects ]
        
        self._access_keys_to_permissions = { api_permissions.GetAccessKey() : api_permissions for api_permissions in api_permissions_objects }
        
    
    def _SetDirty( self ):
        
        self._dirty = True
        
    
    def AddAccess( self, api_permissions ):
        
        with self._lock:
            
            self._access_keys_to_permissions[ api_permissions.GetAccessKey() ] = api_permissions
            
            self._SetDirty()
            
        
    
    def DeleteAccess( self, access_keys ):
        
        with self._lock:
            
            for access_key in access_keys:
                
                if access_key in self._access_keys_to_permissions:
                    
                    del self._access_keys_to_permissions[ access_key ]
                    
                
            
            self._SetDirty()
            
        
    
    def GenerateSessionKey( self, access_key ):
        
        session_key = HydrusData.GenerateKey()
        
        with self._lock:
            
            self._session_keys_to_access_keys_and_expirys[ session_key ] = ( access_key, HydrusData.GetNow() + SESSION_EXPIRY )
            
        
        return session_key
        
    
    def GetAccessKey( self, session_key ):
        
        with self._lock:
            
            if session_key not in self._session_keys_to_access_keys_and_expirys:
                
                raise HydrusExceptions.DataMissing( 'Did not find an entry for that session key!' )
                
            
            ( access_key, session_expiry ) = self._session_keys_to_access_keys_and_expirys[ session_key ]
            
            if HydrusData.TimeHasPassed( session_expiry ):
                
                del self._session_keys_to_access_keys_and_expirys[ session_expiry ]
                
                raise HydrusExceptions.SessionException( 'That session key has expired!' )
                
            
            self._session_keys_to_access_keys_and_expirys[ session_key ] = ( access_key, HydrusData.GetNow() + SESSION_EXPIRY )
            
        
        return access_key
        
    
    def GetAllPermissions( self ):
        
        return list( self._access_keys_to_permissions.values() )
        
    
    def GetPermissions( self, access_key ):
        
        with self._lock:
            
            if access_key not in self._access_keys_to_permissions:
                
                raise HydrusExceptions.DataMissing( 'Did not find an entry for that access key!' )
                
            
            return self._access_keys_to_permissions[ access_key ]
            
        
    
    def IsDirty( self ):
        
        with self._lock:
            
            return self._dirty
            
        
    
    def MaintainMemory( self ):
        
        with self._lock:
            
            for api_permissions in self._access_keys_to_permissions.values():
                
                api_permissions.MaintainMemory()
                
            
        
    
    def OverwriteAccess( self, api_permissions ):
        
        self.AddAccess( api_permissions )
        
    
    def SetClean( self ):
        
        with self._lock:
            
            self._dirty = False
            
        
    
    def SetPermissions( self, api_permissions_objects ):
        
        with self._lock:
            
            self._access_keys_to_permissions = { api_permissions.GetAccessKey() : api_permissions for api_permissions in api_permissions_objects }
            
            self._SetDirty()
            
        
    
HydrusSerialisable.SERIALISABLE_TYPES_TO_OBJECT_TYPES[ HydrusSerialisable.SERIALISABLE_TYPE_CLIENT_API_MANAGER ] = APIManager

class APIPermissions( HydrusSerialisable.SerialisableBaseNamed ):
    
    SERIALISABLE_TYPE = HydrusSerialisable.SERIALISABLE_TYPE_CLIENT_API_PERMISSIONS
    SERIALISABLE_NAME = 'Client API Permissions'
    SERIALISABLE_VERSION = 1
    
    def __init__( self, name = 'new api permissions', access_key = None, basic_permissions = None, search_tag_filter = None ):
        
        if access_key is None:
            
            access_key = HydrusData.GenerateKey()
            
        
        if basic_permissions is None:
            
            basic_permissions = set()
            
        
        if search_tag_filter is None:
            
            search_tag_filter = HydrusTags.TagFilter()
            
        
        HydrusSerialisable.SerialisableBaseNamed.__init__( self, name )
        
        self._access_key = access_key
        
        self._basic_permissions = set( basic_permissions )
        self._search_tag_filter = search_tag_filter
        
        self._last_search_results = None
        self._search_results_timeout = 0
        
        self._lock = threading.Lock()
        
    
    def _GetSerialisableInfo( self ):
        
        serialisable_access_key = self._access_key.hex()
        
        serialisable_basic_permissions = list( self._basic_permissions )
        serialisable_search_tag_filter = self._search_tag_filter.GetSerialisableTuple()
        
        return ( serialisable_access_key, serialisable_basic_permissions, serialisable_search_tag_filter )
        
    
    def _HasPermission( self, permission ):
        
        return permission in self._basic_permissions
        
    
    def _InitialiseFromSerialisableInfo( self, serialisable_info ):
        
        ( serialisable_access_key, serialisable_basic_permissions, serialisable_search_tag_filter ) = serialisable_info
        
        self._access_key = bytes.fromhex( serialisable_access_key )
        
        self._basic_permissions = set( serialisable_basic_permissions )
        self._search_tag_filter = HydrusSerialisable.CreateFromSerialisableTuple( serialisable_search_tag_filter )
        
    
    def CheckAtLeastOnePermission( self, permissions ):
        
        with self._lock:
            
            if True not in ( self._HasPermission( permission ) for permission in permissions ):
                
                raise HydrusExceptions.InsufficientCredentialsException( 'You need at least one these permissions: {}'.format( ', '.join( basic_permission_to_str_lookup[ permission ] for permission in permissions ) ) )
                
            
        
    
    def CheckCanSearchTags( self, tags ):
        
        with self._lock:
            
            if self._search_tag_filter.AllowsEverything():
                
                return
                
            
            if len( tags ) > 0:
                
                filtered_tags = self._search_tag_filter.Filter( tags )
                
                if len( filtered_tags ) > 0:
                    
                    return
                    
                
            
            raise HydrusExceptions.InsufficientCredentialsException( 'You do not have permission to do this search. Your tag search permissions are: {}'.format( self._search_tag_filter.ToPermittedString() ) )
            
        
    
    def CheckCanSeeAllFiles( self ):
        
        with self._lock:
            
            if not ( self._HasPermission( CLIENT_API_PERMISSION_SEARCH_FILES ) and self._search_tag_filter.AllowsEverything() ):
                
                raise HydrusExceptions.InsufficientCredentialsException( 'You do not have permission to see all files, so you cannot do this.' )
                
            
        
    
    def CheckPermission( self, permission ):
        
        if not self.HasPermission( permission ):
            
            raise HydrusExceptions.InsufficientCredentialsException( 'You do not have permission to: {}'.format( basic_permission_to_str_lookup[ permission ] ) )
            
        
    
    def CheckPermissionToSeeFiles( self, hash_ids ):
        
        with self._lock:
            
            if self._search_tag_filter.AllowsEverything():
                
                return
                
            
            if self._last_search_results is None:
                
                raise HydrusExceptions.BadRequestException( 'It looks like those search results are no longer available--please run the search again!' )
                
            
            num_files_asked_for = len( hash_ids )
            num_files_allowed_to_see = len( self._last_search_results.intersection( hash_ids ) )
            
            if num_files_allowed_to_see != num_files_asked_for:
                
                error_text = 'You do not seem to have access to all those files! You asked to see {} files, but you were only authorised to see {} of them!'
                
                error_text = error_text.format( HydrusData.ToHumanInt( num_files_asked_for ), HydrusData.ToHumanInt( num_files_allowed_to_see ) )
                
                raise HydrusExceptions.InsufficientCredentialsException( error_text )
                
            
            self._search_results_timeout = HydrusData.GetNow() + SEARCH_RESULTS_CACHE_TIMEOUT
            
        
    
    def FilterTagPredicateResponse( self, predicates: typing.List[ ClientSearch.Predicate ] ):
        
        with self._lock:
            
            if self._search_tag_filter.AllowsEverything():
                
                return predicates
                
            
            return [ predicate for predicate in predicates if self._search_tag_filter.TagOK( predicate.GetValue() ) ]
            
        
    
    def GenerateNewAccessKey( self ):
        
        with self._lock:
            
            self._access_key = HydrusData.GenerateKey()
            
        
    
    def GetAccessKey( self ):
        
        with self._lock:
            
            return self._access_key
            
        
    
    def GetAdvancedPermissionsString( self ):
        
        with self._lock:
            
            p_strings = []
            
            if self._HasPermission( CLIENT_API_PERMISSION_SEARCH_FILES ):
                
                p_strings.append( 'Can search: {}'.format( self._search_tag_filter.ToPermittedString() ) )
                
            
            return ''.join( p_strings )
            
        
    
    def GetBasicPermissions( self ):
        
        with self._lock:
            
            return self._basic_permissions
            
        
    
    def GetBasicPermissionsString( self ):
        
        with self._lock:
            
            l = sorted( ( basic_permission_to_str_lookup[ p ] for p in self._basic_permissions ) )
            
            return ', '.join( l )
            
        
    
    def GetSearchTagFilter( self ):
        
        with self._lock:
            
            return self._search_tag_filter
            
        
    
    def HasPermission( self, permission ):
        
        with self._lock:
            
            return self._HasPermission( permission )
            
        
    
    def MaintainMemory( self ):
        
        with self._lock:
            
            if self._last_search_results is not None and HydrusData.TimeHasPassed( self._search_results_timeout ):
                
                self._last_search_results = None
                
            
        
    
    def SetLastSearchResults( self, hash_ids ):
        
        with self._lock:
            
            if self._search_tag_filter.AllowsEverything():
                
                return
                
            
            self._last_search_results = set( hash_ids )
            
            self._search_results_timeout = HydrusData.GetNow() + SEARCH_RESULTS_CACHE_TIMEOUT
            
        
    
    def SetSearchTagFilter( self, search_tag_filter ):
        
        with self._lock:
            
            self._search_tag_filter = search_tag_filter
            
        
    
    def ToHumanString( self ):
        
        s = 'API Permissions ({}): '.format( self._name )
        
        basic_string = self.GetBasicPermissionsString()
        advanced_string = self.GetAdvancedPermissionsString()
        
        if len( basic_string ) == '':
            
            s += 'does not have permission to do anything'
            
        else:
            
            s += basic_string
            
            if len( advanced_string ) > 0:
                
                s += ': {}'.format( advanced_string )
                
            
        
        return s
        
    
HydrusSerialisable.SERIALISABLE_TYPES_TO_OBJECT_TYPES[ HydrusSerialisable.SERIALISABLE_TYPE_CLIENT_API_PERMISSIONS ] = APIPermissions