from json import load
from os import path
from uuid import uuid1

from eventlet import spawn_after

from pycs.observable import ObservableDict
from pycs.pipeline.PipelineManager import PipelineManager
from pycs.projects.MediaFile import MediaFile
from pycs.util.RecursiveDictionary import set_recursive


class Project(ObservableDict):
    DEFAULT_PIPELINE_TIMEOUT = 120

    def __init__(self, obj: dict, parent):
        self.pipeline_manager = None
        self.quit_pipeline_thread = None

        # ensure all required object keys are available
        for key in ['data', 'labels', 'jobs']:
            if key not in obj.keys():
                obj[key] = {}

        # load model data
        folder = path.join('projects', obj['id'], 'model')
        with open(path.join(folder, 'distribution.json'), 'r') as file:
            model = load(file)
            model['path'] = folder

            obj['model'] = model

        # save data as MediaFile objects
        for key in obj['data'].keys():
            obj['data'][key] = MediaFile(obj['data'][key], obj['id'])

        # initialize super
        super().__init__(obj, parent)

        # subscribe to changes to write to disk afterwards
        self.subscribe(lambda d, k: self.parent.write_project(self['id']))

    def update_properties(self, update):
        set_recursive(update, self)

    def new_media_file_path(self):
        return path.join('projects', self['id'], 'data'), str(uuid1())

    def add_media_file(self, file):
        file = MediaFile(file, self['id'])
        self['data'][file['id']] = file

    def remove_media_file(self, file_id):
        del self['data'][file_id]

    def add_label(self, name):
        label_uuid = str(uuid1())
        self['labels'][label_uuid] = {
            'id': label_uuid,
            'name': name
        }

    def update_label(self, identifier, name):
        if identifier in self['labels']:
            self['labels'][identifier]['name'] = name

    def remove_label(self, identifier):
        # abort if identifier is unknown
        if identifier not in self['labels']:
            return

        # remove label from data elements
        remove = list()

        for data in self['data']:
            for pred in self['data'][data]['predictionResults']:
                if 'label' in self['data'][data]['predictionResults'][pred]:
                    if self['data'][data]['predictionResults'][pred]['label'] == identifier:
                        remove.append((data, pred))

        for t in remove:
            del self['data'][t[0]]['predictionResults'][t[1]]

        # remove label from list
        del self['labels'][identifier]

    def predict(self, identifiers):
        # create pipeline
        pipeline = self.__create_pipeline()

        # run jobs
        for file_id in identifiers:
            if file_id in self['data'].keys():
                pipeline.run(self['data'][file_id])

        # schedule timeout thread
        self.quit_pipeline_thread = spawn_after(self.DEFAULT_PIPELINE_TIMEOUT, self.__quit_pipeline)

    def fit(self):
        # create pipeline
        pipeline = self.__create_pipeline()

        # run fit
        pipeline.fit()

        # schedule timeout thread
        self.quit_pipeline_thread = spawn_after(self.DEFAULT_PIPELINE_TIMEOUT, self.__quit_pipeline)

    def __create_pipeline(self):
        # abort pipeline termination
        self.__quit_pipeline_thread()

        # create pipeline if it does not exist already
        if self.pipeline_manager is None:
            self.pipeline_manager = PipelineManager(self)

        return self.pipeline_manager

    def __quit_pipeline(self):
        if self.pipeline_manager is not None:
            self.pipeline_manager.close()
            self.pipeline_manager = None
            self.quit_pipeline_thread = None

    def __create_quit_pipeline_thread(self):
        # abort pipeline termination
        self.__quit_pipeline_thread()

        # create new thread
        self.quit_pipeline_thread = spawn_after(self.DEFAULT_PIPELINE_TIMEOUT, self.__quit_pipeline)

    def __quit_pipeline_thread(self):
        if self.quit_pipeline_thread is not None:
            self.quit_pipeline_thread.cancel()
            self.quit_pipeline_thread = None