"""
API operations on a data library.
"""
import logging

from galaxy import (
    exceptions,
    util
)
from galaxy.managers import (
    folders,
    libraries,
    roles
)
from galaxy.web import (
    expose_api,
    expose_api_anonymous,
)
from galaxy.webapps.base.controller import BaseAPIController

log = logging.getLogger(__name__)


class LibrariesController(BaseAPIController):

    def __init__(self, app):
        super(LibrariesController, self).__init__(app)
        self.folder_manager = folders.FolderManager()
        self.library_manager = libraries.LibraryManager()
        self.role_manager = roles.RoleManager(app)

    @expose_api_anonymous
    def index(self, trans, **kwd):
        """
        index( self, trans, **kwd )
        * GET /api/libraries:
            Returns a list of summary data for all libraries.

        :param  deleted: if True, show only ``deleted`` libraries, if False show only ``non-deleted``
        :type   deleted: boolean (optional)

        :returns:   list of dictionaries containing library information
        :rtype:     list

        .. seealso:: :attr:`galaxy.model.Library.dict_collection_visible_keys`

        """
        deleted = util.string_as_bool_or_none(kwd.get('deleted', None))
        query, prefetched_ids = self.library_manager.list(trans, deleted)
        libraries = []
        for library in query:
            libraries.append(self.library_manager.get_library_dict(trans, library, prefetched_ids))
        return libraries

    def __decode_id(self, trans, encoded_id, object_name=None):
        """
        Try to decode the id.

        :param  object_name:      Name of the object the id belongs to. (optional)
        :type   object_name:      str
        """
        try:
            return trans.security.decode_id(encoded_id)
        except TypeError:
            raise exceptions.MalformedId('Malformed %s id specified, unable to decode.' % object_name if object_name is not None else '')
        except ValueError:
            raise exceptions.MalformedId('Wrong %s id specified, unable to decode.' % object_name if object_name is not None else '')

    @expose_api_anonymous
    def show(self, trans, id, deleted='False', **kwd):
        """
        show( self, trans, id, deleted='False', **kwd )
        * GET /api/libraries/{encoded_id}:
            returns detailed information about a library
        * GET /api/libraries/deleted/{encoded_id}:
            returns detailed information about a ``deleted`` library

        :param  id:      the encoded id of the library
        :type   id:      an encoded id string
        :param  deleted: if True, allow information on a ``deleted`` library
        :type   deleted: boolean

        :returns:   detailed library information
        :rtype:     dictionary

        .. seealso:: :attr:`galaxy.model.Library.dict_element_visible_keys`

        :raises: MalformedId, ObjectNotFound
        """
        library = self.library_manager.get(trans, self.__decode_id(trans, id, 'library'))
        library_dict = self.library_manager.get_library_dict(trans, library)
        return library_dict

    @expose_api
    def create(self, trans, payload=None, **kwd):
        """
        * POST /api/libraries:
            Creates a new library.

        .. note:: Currently, only admin users can create libraries.

        :param  payload: dictionary structure containing::
            :param name:         (required) the new library's name
            :type  name:         str
            :param description:  the new library's description
            :type  description:  str
            :param synopsis:     the new library's synopsis
            :type  synopsis:     str
        :type   payload: dict
        :returns:   detailed library information
        :rtype:     dict
        :raises: RequestParameterMissingException
        """
        if payload:
            kwd.update(payload)
        name = kwd.get('name', None)
        if not name:
            raise exceptions.RequestParameterMissingException("Missing required parameter 'name'.")
        description = kwd.get('description', '')
        synopsis = kwd.get('synopsis', '')
        if synopsis in ['None', None]:
            synopsis = ''
        library = self.library_manager.create(trans, name, description, synopsis)
        library_dict = self.library_manager.get_library_dict(trans, library)
        return library_dict

    @expose_api
    def update(self, trans, id, payload=None, **kwd):
        """
        * PATCH /api/libraries/{encoded_id}
           Updates the library defined by an ``encoded_id`` with the data in the payload.

       .. note:: Currently, only admin users can update libraries. Also the library must not be `deleted`.

        :param  id:      the encoded id of the library
        :type   id:      an encoded id string
        :param  payload: dictionary structure containing::
            :param name:         new library's name, cannot be empty
            :type  name:         str
            :param description:  new library's description
            :type  description:  str
            :param synopsis:     new library's synopsis
            :type  synopsis:     str
        :type   payload: dict
        :returns:   detailed library information
        :rtype:     dict
        :raises: RequestParameterMissingException
        """
        library = self.library_manager.get(trans, self.__decode_id(trans, id, 'library'))
        if payload:
            kwd.update(payload)
        name = kwd.get('name', None)
        if name == '':
            raise exceptions.RequestParameterMissingException("Parameter 'name' of library is required. You cannot remove it.")
        description = kwd.get('description', None)
        synopsis = kwd.get('synopsis', None)
        updated_library = self.library_manager.update(trans, library, name, description, synopsis)
        library_dict = self.library_manager.get_library_dict(trans, updated_library)
        return library_dict

    @expose_api
    def delete(self, trans, id, payload=None, **kwd):
        """
        * DELETE /api/libraries/{id}
            marks the library with the given ``id`` as `deleted` (or removes the `deleted` mark if the `undelete` param is true)

        .. note:: Currently, only admin users can un/delete libraries.

        :param  id:     the encoded id of the library to un/delete
        :type   id:     an encoded id string

        :param   payload: dictionary structure containing:
            :param  undelete:    (optional) flag specifying whether the item should be deleted or undeleted, defaults to false:
            :type   undelete:    bool
        :type:     dictionary
        :returns:   detailed library information
        :rtype:     dictionary

        .. seealso:: :attr:`galaxy.model.Library.dict_element_visible_keys`
        """
        if payload:
            kwd.update(payload)
        library = self.library_manager.get(trans, self.__decode_id(trans, id, 'library'))
        undelete = util.string_as_bool(kwd.get('undelete', False))
        library = self.library_manager.delete(trans, library, undelete)
        library_dict = self.library_manager.get_library_dict(trans, library)
        return library_dict

    @expose_api
    def get_permissions(self, trans, encoded_library_id, **kwd):
        """
        * GET /api/libraries/{id}/permissions

        Load all permissions for the given library id and return it.

        :param  encoded_library_id:     the encoded id of the library
        :type   encoded_library_id:     an encoded id string

        :param  scope:      either 'current' or 'available'
        :type   scope:      string

        :param  is_library_access:      indicates whether the roles available for the library access are requested
        :type   is_library_access:      bool

        :returns:   dictionary with all applicable permissions' values
        :rtype:     dictionary

        :raises: InsufficientPermissionsException
        """
        current_user_roles = trans.get_current_user_roles()
        is_admin = trans.user_is_admin
        library = self.library_manager.get(trans, self.__decode_id(trans, encoded_library_id, 'library'))
        if not (is_admin or trans.app.security_agent.can_manage_library_item(current_user_roles, library)):
            raise exceptions.InsufficientPermissionsException('You do not have proper permission to access permissions of this library.')

        scope = kwd.get('scope', None)
        is_library_access = util.string_as_bool(kwd.get('is_library_access', False))

        if scope == 'current' or scope is None:
            roles = self.library_manager.get_current_roles(trans, library)
            return roles

        #  Return roles that are available to select.
        elif scope == 'available':
            page = kwd.get('page', None)
            if page is not None:
                page = int(page)
            else:
                page = 1

            page_limit = kwd.get('page_limit', None)
            if page_limit is not None:
                page_limit = int(page_limit)
            else:
                page_limit = 10

            query = kwd.get('q', None)

            roles, total_roles = trans.app.security_agent.get_valid_roles(trans, library, query, page, page_limit, is_library_access)

            return_roles = []
            for role in roles:
                role_id = trans.security.encode_id(role.id)
                return_roles.append(dict(id=role_id, name=role.name, type=role.type))
            return dict(roles=return_roles, page=page, page_limit=page_limit, total=total_roles)
        else:
            raise exceptions.RequestParameterInvalidException("The value of 'scope' parameter is invalid. Alllowed values: current, available")

    @expose_api
    def set_permissions(self, trans, encoded_library_id, payload=None, **kwd):
        """
        *POST /api/libraries/{encoded_library_id}/permissions
            Set permissions of the given library to the given role ids.

        :param  encoded_library_id:      the encoded id of the library to set the permissions of
        :type   encoded_library_id:      an encoded id string
        :param   payload: dictionary structure containing:
            :param  action:            (required) describes what action should be performed
                                       available actions: remove_restrictions, set_permissions
            :type   action:            str
            :param  access_ids[]:      list of Role.id defining roles that should have access permission on the library
            :type   access_ids[]:      string or list
            :param  add_ids[]:         list of Role.id defining roles that should have add item permission on the library
            :type   add_ids[]:         string or list
            :param  manage_ids[]:      list of Role.id defining roles that should have manage permission on the library
            :type   manage_ids[]:      string or list
            :param  modify_ids[]:      list of Role.id defining roles that should have modify permission on the library
            :type   modify_ids[]:      string or list
        :type:      dictionary
        :returns:   dict of current roles for all available permission types
        :rtype:     dictionary
        :raises: RequestParameterInvalidException, InsufficientPermissionsException, InternalServerError
                    RequestParameterMissingException
        """
        if payload:
            kwd.update(payload)
        is_admin = trans.user_is_admin
        current_user_roles = trans.get_current_user_roles()
        library = self.library_manager.get(trans, self.__decode_id(trans, encoded_library_id, 'library'))

        if not (is_admin or trans.app.security_agent.can_manage_library_item(current_user_roles, library)):
            raise exceptions.InsufficientPermissionsException('You do not have proper permission to modify permissions of this library.')

        new_access_roles_ids = util.listify(kwd.get('access_ids[]', None))
        new_add_roles_ids = util.listify(kwd.get('add_ids[]', None))
        new_manage_roles_ids = util.listify(kwd.get('manage_ids[]', None))
        new_modify_roles_ids = util.listify(kwd.get('modify_ids[]', None))

        action = kwd.get('action', None)
        if action is None:
            if payload is not None:
                return self.set_permissions_old(trans, library, payload, **kwd)
            else:
                raise exceptions.RequestParameterMissingException('The mandatory parameter "action" is missing.')
        elif action == 'remove_restrictions':
            is_public = self.library_manager.make_public(trans, library)
            if not is_public:
                raise exceptions.InternalServerError('An error occurred while making library public.')
        elif action == 'set_permissions':

            # ACCESS LIBRARY ROLES
            valid_access_roles = []
            invalid_access_roles_names = []
            for role_id in new_access_roles_ids:
                role = self.role_manager.get(trans, self.__decode_id(trans, role_id, 'role'))
                valid_roles, total_roles = trans.app.security_agent.get_valid_roles(trans, library, is_library_access=True)
                if role in valid_roles:
                    valid_access_roles.append(role)
                else:
                    invalid_access_roles_names.append(role_id)
            if len(invalid_access_roles_names) > 0:
                log.warning("The following roles could not be added to the library access permission: " + str(invalid_access_roles_names))

            # ADD TO LIBRARY ROLES
            valid_add_roles = []
            invalid_add_roles_names = []
            for role_id in new_add_roles_ids:
                role = self.role_manager.get(trans, self.__decode_id(trans, role_id, 'role'))
                valid_roles, total_roles = trans.app.security_agent.get_valid_roles(trans, library)
                if role in valid_roles:
                    valid_add_roles.append(role)
                else:
                    invalid_add_roles_names.append(role_id)
            if len(invalid_add_roles_names) > 0:
                log.warning("The following roles could not be added to the add library item permission: " + str(invalid_add_roles_names))

            # MANAGE LIBRARY ROLES
            valid_manage_roles = []
            invalid_manage_roles_names = []
            for role_id in new_manage_roles_ids:
                role = self.role_manager.get(trans, self.__decode_id(trans, role_id, 'role'))
                valid_roles, total_roles = trans.app.security_agent.get_valid_roles(trans, library)
                if role in valid_roles:
                    valid_manage_roles.append(role)
                else:
                    invalid_manage_roles_names.append(role_id)
            if len(invalid_manage_roles_names) > 0:
                log.warning("The following roles could not be added to the manage library permission: " + str(invalid_manage_roles_names))

            # MODIFY LIBRARY ROLES
            valid_modify_roles = []
            invalid_modify_roles_names = []
            for role_id in new_modify_roles_ids:
                role = self.role_manager.get(trans, self.__decode_id(trans, role_id, 'role'))
                valid_roles, total_roles = trans.app.security_agent.get_valid_roles(trans, library)
                if role in valid_roles:
                    valid_modify_roles.append(role)
                else:
                    invalid_modify_roles_names.append(role_id)
            if len(invalid_modify_roles_names) > 0:
                log.warning("The following roles could not be added to the modify library permission: " + str(invalid_modify_roles_names))

            permissions = {trans.app.security_agent.permitted_actions.LIBRARY_ACCESS: valid_access_roles}
            permissions.update({trans.app.security_agent.permitted_actions.LIBRARY_ADD: valid_add_roles})
            permissions.update({trans.app.security_agent.permitted_actions.LIBRARY_MANAGE: valid_manage_roles})
            permissions.update({trans.app.security_agent.permitted_actions.LIBRARY_MODIFY: valid_modify_roles})

            trans.app.security_agent.set_all_library_permissions(trans, library, permissions)
            trans.sa_session.refresh(library)
            # Copy the permissions to the root folder
            trans.app.security_agent.copy_library_permissions(trans, library, library.root_folder)
        else:
            raise exceptions.RequestParameterInvalidException('The mandatory parameter "action" has an invalid value.'
                                                              'Allowed values are: "remove_restrictions", set_permissions"')
        roles = self.library_manager.get_current_roles(trans, library)
        return roles

    def set_permissions_old(self, trans, library, payload, **kwd):
        """
        *** old implementation for backward compatibility ***

        POST /api/libraries/{encoded_library_id}/permissions
        Updates the library permissions.
        """
        params = util.Params(payload)
        permissions = {}
        for k, v in trans.app.model.Library.permitted_actions.items():
            role_params = params.get(k + '_in', [])
            in_roles = [trans.sa_session.query(trans.app.model.Role).get(trans.security.decode_id(x)) for x in util.listify(role_params)]
            permissions[trans.app.security_agent.get_action(v.action)] = in_roles
        trans.app.security_agent.set_all_library_permissions(trans, library, permissions)
        trans.sa_session.refresh(library)
        # Copy the permissions to the root folder
        trans.app.security_agent.copy_library_permissions(trans, library, library.root_folder)
        item = library.to_dict(view='element', value_mapper={'id': trans.security.encode_id, 'root_folder_id': trans.security.encode_id})
        return item
