import hashlib
import json
import logging
import os
import uuid
from datetime import datetime

from utilities.render_worker import RenderStatus, RenderWorkerFactory

logger = logging.getLogger()


class RenderJob:

    def __init__(self, renderer, input_path, output_path, args, priority=2, owner=None, client=None, notify=None, custom_id=None):
        self.id = custom_id or self.generate_id()
        self.owner = owner
        self.priority = priority
        self.client = client
        self.notify = notify
        self.date_created = datetime.now()
        self.scheduled_start = None
        self.renderer = renderer
        self.name = os.path.basename(input_path) + '_' + self.date_created.isoformat()
        self.archived = False

        self.worker = RenderWorkerFactory.create_worker(renderer, input_path, output_path, args)
        self.worker.log_path = os.path.join(os.path.dirname(input_path), os.path.basename(input_path) + '.log')

    def render_status(self):
        """Returns status of render job"""
        try:
            if self.scheduled_start and self.worker.status == RenderStatus.NOT_STARTED:
                return RenderStatus.SCHEDULED
            else:
                return self.worker.status
        except Exception as e:
            logger.warning("render_status error: {}".format(e))
            return RenderStatus.ERROR

    def file_hash(self):
        return hashlib.md5(open(self.worker.input_path, 'rb').read()).hexdigest()

    def json(self):
        """Converts RenderJob into JSON format"""
        import numbers

        def date_serializer(o):
            if isinstance(o, datetime):
                return o.isoformat()

        json_string = ''

        try:
            d = self.__dict__.copy()
            d['status'] = self.render_status().value
            d['file_hash'] = self.file_hash if isinstance(self.file_hash, str) else self.file_hash()
            d['worker'] = self.worker.__dict__.copy()
            for key in ['thread', 'process']:  # remove unwanted keys from JSON
                d['worker'].pop(key, None)
            d['worker']['status'] = d['status']

            # jobs from current_session generate percent completed
            # jobs after loading server pull in a saved value. Have to check if callable object or not

            percent_complete = self.worker.percent_complete if isinstance(self.worker.percent_complete, numbers.Number) \
                else self.worker.percent_complete()
            d['worker']['percent_complete'] = percent_complete

            json_string = json.dumps(d, default=date_serializer)
        except Exception as e:
            logger.exception(e)
            logger.error("Error converting to JSON: {}".format(e))
        return json_string

    @classmethod
    def generate_id(cls):
        return str(uuid.uuid4()).split('-')[0]