import logging
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Column, Integer, String, DateTime, Float
from sqlalchemy.orm import relationship
from sqlalchemy.sql.schema import ForeignKey, Sequence
from sqlalchemy.engine import create_engine
from sqlalchemy.orm.session import sessionmaker
import datetime
from contextlib import contextmanager
import uuid
import os
import coloredlogs
import argparse
from sqlalchemy.sql.functions import func

mainLogger = logging.getLogger("sorteerhoed")
logger = mainLogger.getChild("store")

Base = declarative_base()

"""
HIT lifetime:


created
accepted
(returned!)
working
awaiting amazon confirmation (submitted on page)
submitted

Actions:
creating Hit (creating hit with scanned image)

Scanning 

"""

class HIT(Base):
    __tablename__ = 'hits'
    id = Column(Integer, Sequence('hit_id'), primary_key=True) # our sequential hit id
    hit_id = Column(String(255)) # amazon's hit id
    created_at = Column(DateTime, default=datetime.datetime.utcnow)
    updated_at = Column(DateTime, default=datetime.datetime.utcnow)
    uuid = Column(String(32), default=lambda : uuid.uuid4().hex)
    assignment_id = Column(String(255), default = None)
    worker_id = Column(String(255), default = None)
    accept_time = Column(DateTime, default=None)
    open_page_at = Column(DateTime, default=None)
    submit_page_at = Column(DateTime, default=None)
    submit_hit_at = Column(DateTime, default=None)
    answer = Column(String(255), default=None)
    turk_ip = Column(String(255), default=None)
    turk_country = Column(String(255), default=None)
    turk_screen_width = Column(Integer, default = None)
    turk_screen_height = Column(Integer, default = None)
    scanned_at = Column(DateTime, default=None)
    fee = Column(Float(precision=2), default=None)
    
    
    def getImagePath(self):
        return os.path.join('www', self.getImageUrl())
    
    def getImageUrl(self):
        return f"scans/{self.id}.jpg"

    def getStatus(self):
        if self.scanned_at:
            return "completed"
        if self.submit_hit_at:
            return "submission confirmed"
        if self.submit_page_at:
            return "submitted by worker"
        if self.open_page_at:
            return "working"
        if self.accept_time:
            return "accepted by worker"
        return "created"
        


class Store:
    def __init__(self, db_filename, logLevel=0):
        path = os.path.abspath(db_filename)
        if logLevel <= logging.DEBUG:
            logging.getLogger('sqlalchemy.engine').setLevel(logging.INFO)
            
        self.engine = create_engine('sqlite:///'+path, echo=False, connect_args={'check_same_thread': False})
        Base.metadata.create_all(self.engine)
        self.Session = sessionmaker(bind=self.engine)
        self.session = self.Session()
        
        self.currentHit = None # mirrors Centralmanagmenet, stored here so we can quickly access it from webserver classes
    
    @contextmanager
    def getSession(self):
        """Provide a transactional scope around a series of operations."""
        try:
            yield self.session
            self.session.commit()
        except:
            self.session.rollback()
            raise
    
    def getHits(self, session):
        return self.session.query(Source).order_by(HIT.created_at.desc())
        
    def getHitById(self, hitId):
        return self.session.query(HIT).\
          filter(HIT.id==hitId).one()
    
    def getHitByRemoteId(self, amazonHitId):
        return self.session.query(HIT).\
          filter(HIT.hit_id==amazonHitId).one()
          
    
    def getLastSubmittedHit(self):
        return self.session.query(HIT).\
          filter(HIT.submit_page_at!=None).\
          order_by(HIT.submit_page_at.desc()).first()
    
    def createHIT(self):
        with self.getSession() as s:
            hit = HIT()
            s.add(hit)
            s.flush()
            s.refresh(hit)
            logger.info(f"Created HIT {hit.id}")
        return hit
            
    def saveHIT(self, hit):
        with self.getSession() as s:
            logger.info(f"Updating hit! {hit.id}")
#             s.flush()
    
    def addHIT(self, hit: HIT):
        with self.getSession() as s:
            s.add(hit)
            s.flush()
            s.refresh(hit)
            logger.info(f"Added {hit.id}")
    
    def getAvgDurationOfPreviousNHits(self, n) -> int:
        latest_hits = self.session.query(HIT).\
          filter(HIT.submit_hit_at!=None).\
          filter(HIT.accept_time!=None).\
          order_by(HIT.submit_hit_at.desc()).limit(n)
        durations = []
        for hit in latest_hits:
            durations.append((hit.submit_hit_at - hit.accept_time).total_seconds())
        if not len(durations):
            return int(2.5*60)
        return int(sum(durations) / len(durations))
    
    def getHITs(self, n = 100):
        return self.session.query(HIT).\
                filter(HIT.submit_hit_at != None).\
                order_by(HIT.submit_hit_at.desc()).limit(n)
    
#     def rmSource(self, id: int):
#         with self.getSession() as session:
#             source = session.query(Source).get(id)
#             if not source:
#                 logging.warning(f"Source nr {id} not found")
#             else:
#                 logging.info(f"Deleting source {source.id}: {source.url}")
#                 session.delete(source)
#     
#     def getRandomNewsItem(self, session) -> NewsItem:
#         return session.query(NewsItem).order_by(func.random()).limit(1).first()