import time
import uuid
import json
from loguru import logger
from datetime import datetime, timedelta
from sqlalchemy import func, or_, and_, not_, Boolean
from sqlalchemy.orm import noload
from overseer.flask import db, SQLITE_MODE
from overseer.utils import hash_api_key
from sqlalchemy.orm import joinedload
from overseer.classes.instance import Instance, Endorsement, Guarantee

def get_all_instances(min_endorsements = 0, min_guarantors = 1):
    query = db.session.query(
        Instance
    ).outerjoin(
        Instance.endorsements,
        Instance.guarantors,
    ).options(
        joinedload(Instance.guarantors),
        joinedload(Instance.endorsements),
    ).group_by(
        Instance.id
    ).filter(
        or_(
            Instance.oprhan_since == None,
            Instance.oprhan_since > datetime.utcnow() - timedelta(hours=24)
        )
    ).having(
        db.func.count(Instance.endorsements) >= min_endorsements,
    ).having(
        db.func.count(Instance.guarantors) >= min_guarantors,
    )
    return query.all()


def get_all_endorsed_instances_by_approving_id(approving_id):
    query = db.session.query(
        Instance
    ).outerjoin(
        Instance.endorsements,
    ).options(
        joinedload(Instance.endorsements),
    ).filter(
        Endorsement.approving_id == approving_id
    ).group_by(
        Instance.id
    )
    return query.all()

def get_all_approving_instances_by_endorsed_id(endorsed_id):
    query = db.session.query(
        Instance
    ).outerjoin(
        Instance.approvals,
    ).options(
        joinedload(Instance.approvals),
    ).filter(
        Endorsement.endorsed_id == endorsed_id
    ).group_by(
        Instance.id
    )
    return query.all()

def get_all_guaranteed_instances_by_guarantor_id(guarantor_id):
    query = db.session.query(
        Instance
    ).outerjoin(
        Instance.guarantors,
    ).options(
        joinedload(Instance.guarantors),
    ).filter(
        Guarantee.guarantor_id == guarantor_id
    ).group_by(
        Instance.id
    )
    return query.all()

def get_all_guarantor_instances_by_guaranteed_id(guaranteed_id):
    query = db.session.query(
        Instance
    ).outerjoin(
        Instance.guarantees,
    ).options(
        joinedload(Instance.guarantees),
    ).filter(
        Guarantee.guaranteed_id == guaranteed_id
    ).group_by(
        Instance.id
    )
    return query.all()


def find_instance_by_api_key(api_key):
    instance = Instance.query.filter_by(api_key=hash_api_key(api_key)).first()
    return instance

def find_instance_by_domain(domain):
    instance = Instance.query.filter_by(domain=domain).first()
    return instance

def find_authenticated_instance(domain,api_key):
    instance = Instance.query.filter_by(domain=domain, api_key=hash_api_key(api_key)).first()
    return instance

def get_endorsement(instance_id, endorsing_instance_id):
    query = Endorsement.query.filter_by(
        endorsed_id=instance_id,
        approving_id=endorsing_instance_id,
    )
    return query.first()

def get_guarantee(instance_id, guarantor_id):
    query = Guarantee.query.filter_by(
        guaranteed_id=instance_id,
        guarantor_id=guarantor_id,
    )
    return query.first()

def get_guarantor_chain(instance_id):
    guarantors = set()
    chainbreaker = None
    query = Guarantee.query.filter_by(
        guaranteed_id=instance_id,
    )
    guarantor = query.first()
    if not guarantor:
        return set(),instance_id
    guarantors.add(guarantor.guarantor_id)
    if guarantor.guarantor_id != 0:
        higher_guarantors, chainbreaker = get_guarantor_chain(guarantor.guarantor_id)
        guarantors = higher_guarantors | guarantors
    return guarantors,chainbreaker

def has_unbroken_chain(instance_id):
    guarantors, chainbreaker = get_guarantor_chain(instance_id)
    if chainbreaker:
        chainbreaker = Instance.query.filter_by(id=chainbreaker).first()
    return 0 in guarantors,chainbreaker

def get_guarantee_chain(instance_id):
    query = Guarantee.query.filter_by(
        guarantor_id=instance_id,
    )
    guarantees = query.all()
    if not guarantees:
        return set()
    guarantees_ids = set([g.guaranteed_id for g in guarantees])
    for gid in guarantees_ids:
        guarantees_ids = guarantees_ids | get_guarantee_chain(gid)
    return guarantees_ids

def get_instances_by_ids(instance_ids):
    query = Instance.query.filter(
        Instance.id.in_(instance_ids)
    )
    return query