#  Copyright (c) 2021, CRS4
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from csv import DictReader, DictWriter
from uuid import uuid4
import logging, sys

from django.core.management.base import BaseCommand, CommandError
from django.contrib.auth.models import Group
from promort.settings import DEFAULT_GROUPS
from predictions_manager.models import Prediction
from reviews_manager.models import PredictionReview

logger = logging.getLogger('promort_commands')


class Command(BaseCommand):
    help = 'build Predictions reviews worklist'

    def add_arguments(self, parser):
        parser.add_argument('--prediction-type', choices=['TUMOR', 'GLEASON'], type=str, dest='prediction_type',
                            help='the type of the Prediction objects that are going to be reviewed')
        parser.add_argument('--worklist-file', dest='worklist', type=str, default=None,
                            help='a CSV file containing the worklist, if not present reviews will be assigned randomly')
        parser.add_argument('--allow-duplicated', action='store_true', dest='allow_duplicated',
                            help='create worklist even for predictions that already have a related review')
        parser.add_argument('--report-file', dest='report_file', type=str, default=None,
                            help='a CSV file containing a report of the created prediction reviews')

    def _get_prediction_reviews_manager_users(self):
        prev_manager_group = Group.objects.get(name=DEFAULT_GROUPS['prediction_manager']['name'])
        return prev_manager_group.user_set.all()

    def _get_predictions_list(self, prediction_type):
        return Prediction.objects.filter(type=prediction_type, review_required=True).all()

    def _check_duplicated(self, prediction, reviewer):
        annotation_objs = PredictionReview.objects.filter(prediction=prediction, reviewer=reviewer)
        if annotation_objs.count() > 0:
            

        else:
            return False

    def _create_prediction_annotation(self, prediction, reviewer, allow_duplicated):
        if not allow_duplicated:
            if self._check_duplicated(prediction, reviewer):
                return None
        prev_obj = PredictionReview(
            label=uuid4().hex,
            prediction=prediction,
            slide=prediction.slide,
            reviewer=reviewer
        )
        prev_obj.save()
        return {
            'review_id': prev_obj.id,
            'slide': prev_obj.slide.id,
            'prediction': prev_obj.prediction.label,
            'review_label': prev_obj.label,
            'reviewer': prev_obj.reviewer.username
        }

    def create_random_worklist(self, prediction_type, allow_duplicated, report_file=None):
        logger.info('Creating RANDOM worklist')
        prediction_rev_managers = self._get_prediction_reviews_manager_users()
        if len(prediction_rev_managers) < 1:
            raise CommandError('No prediction managers configured')
        predictions = self._get_predictions_list(prediction_type)
        for i, pred in enumerate(predictions):
            logger.info('Processing prediction %s', pred.label)
            pred_report = self._create_prediction_annotation(pred,
                                                             prediction_rev_managers[i % len(prediction_rev_managers)],
                                                             allow_duplicated)
            if report_file and pred_report:
                report_file.writerow(pred_report)

    def create_worklist_from_file(self, worklist_file, prediction_type, allow_duplicated, report_file=None):
        raise NotImplementedError()

    def handle(self, *args, **opts):
        logger.info('=== Starting Predictions Reviews worklist creation ===')
        worklist_file = opts['worklist']
        allow_duplicated = opts['allow_duplicated']
        if opts['report_file']:
            report_file = open(opts['report_file'], 'w')
            report_writer = DictWriter(report_file,
                                       ['review_id', 'review_label', 'slide', 'prediction', 'reviewer'])
            report_writer.writeheader()
        else:
            report_writer = None
        try:
            if worklist_file:
                self.create_worklist_from_file(worklist_file, opts['prediction_type'], allow_duplicated, report_writer)
            else:
                self.create_random_worklist(opts['prediction_type'], allow_duplicated, report_writer)
        except CommandError as cme:
            logger.error('A problem occurred while building the worklist, exit')
            sys.exit(cme)
        if report_writer:
            report_file.close()
        logger.info('=== Prediction Reviews worklist creation completed ===')

logger.info('There are already %d reviews for prediction %s assigned to user %s',
                        annotation_objs.count(), prediction.label, reviewer.username)
            return True