from . import db, socketio
from .models import Job, JobInput, JobResult
import logging


###############################################################################
# SQLAlchemy event handlers                                                   #
###############################################################################

###############################################################################
## Job events                                                                 #
###############################################################################
@db.event.listens_for(Job, 'after_update')
def after_job_update(mapper, connection, job):
    jsonpatch = []
    for attr in db.inspect(job).attrs:
        # We don't want to emit changes about relationship fields
        if attr.key in ['inputs', 'results']:
            continue
        history = attr.load_history()
        if not history.has_changes():
            continue
        new_value = history.added[0]
        # DateTime attributes must be converted to a timestamp
        if attr.key in ['creation_date', 'end_date']:
            new_value = None if new_value is None else new_value.timestamp()
        jsonpatch.append(
            {
                'op': 'replace',
                'path': '/jobs/{}/{}'.format(job.id, attr.key),
                'value': new_value
            }
        )
    if jsonpatch:
        event = 'user_{}_patch'.format(job.user_id)
        room = 'user_{}'.format(job.user_id)
        socketio.emit(event, jsonpatch, room=room)

@db.event.listens_for(Job, 'after_insert')
def after_job_insert(mapper, connection, job):
    event = 'user_{}_patch'.format(job.user_id)
    jsonpatch = [
        {
            'op': 'add',
            'path': '/jobs/{}'.format(job.id),
            'value': job.to_dict(include_relationships=False)
        }
    ]
    room = 'user_{}'.format(job.user_id)
    socketio.emit(event, jsonpatch, room=room)

@db.event.listens_for(Job, 'after_delete')
def after_job_delete(mapper, connection, job):
    event = 'user_{}_patch'.format(job.user_id)
    jsonpatch = [{'op': 'remove', 'path': '/jobs/{}'.format(job.id)}]
    room = 'user_{}'.format(job.user_id)
    socketio.emit(event, jsonpatch, room=room)

###############################################################################
## JobInput events                                                            #
###############################################################################
@db.event.listens_for(JobInput, 'after_update')
def after_job_input_update(mapper, connection, job_input):
    jsonpatch = []
    for attr in db.inspect(job_input).attrs:
        history = attr.load_history()
        if not history.has_changes():
            continue
        new_value = history.added[0]
        jsonpatch.append(
            {
                'op': 'replace',
                'path': '/jobs/{}/inputs/{}/{}'.format(job_input.job_id,
                                                       job_input.id,
                                                       attr.key),
                'value': new_value
            }
        )
    if jsonpatch:
        event = 'user_{}_patch'.format(job_input.job.user_id)
        room = 'user_{}'.format(job_input.job.user_id)
        socketio.emit(event, jsonpatch, room=room)

@db.event.listens_for(JobInput, 'after_insert')
def after_job_input_insert(mapper, connection, job_input):
    event = 'user_{}_patch'.format(job_input.job.user_id)
    jsonpatch = [
        {
            'op': 'add',
            'path': '/jobs/{}/inputs/{}'.format(job_input.job_id,
                                                job_input.id),
            'value': job_input.to_dict(include_relationships=False)
        }
    ]
    room = 'user_{}'.format(job_input.job.user_id)
    socketio.emit(event, jsonpatch, room=room)

@db.event.listens_for(JobInput, 'after_delete')
def after_job_input_delete(mapper, connection, job_input):
    event = 'user_{}_patch'.format(job_input.job.user_id)
    jsonpatch = [
        {
            'op': 'remove',
            'path': '/jobs/{}/inputs/{}'.format(job_input.job_id,
                                                job_input.id)
        }
    ]
    room = 'user_{}'.format(job_input.job.user_id)
    socketio.emit(event, jsonpatch, room=room)

###############################################################################
## JobResult events                                                           #
###############################################################################
@db.event.listens_for(JobResult, 'after_update')
def after_job_result_update(mapper, connection, job_result):
    jsonpatch = []
    for attr in db.inspect(job_result).attrs:
        history = attr.load_history()
        if not history.has_changes():
            continue
        new_value = history.added[0]
        jsonpatch.append(
            {
                'op': 'replace',
                'path': '/jobs/{}/results/{}/{}'.format(job_result.job_id,
                                                        job_result.id,
                                                        attr.key),
                'value': new_value
            }
        )
    if jsonpatch:
        event = 'user_{}_patch'.format(job_result.job.user_id)
        room = 'user_{}'.format(job_result.job.user_id)
        socketio.emit(event, jsonpatch, room=room)

@db.event.listens_for(JobResult, 'after_insert')
def after_job_result_insert(mapper, connection, job_result):
    event = 'user_{}_patch'.format(job_result.job.user_id)
    jsonpatch = [
        {
            'op': 'add',
            'path': '/jobs/{}/results/{}'.format(job_result.job_id,
                                                 job_result.id),
            'value': job_result.to_dict(include_relationships=False)
        }
    ]
    room = 'user_{}'.format(job_result.job.user_id)
    socketio.emit(event, jsonpatch, room=room)

@db.event.listens_for(JobResult, 'after_delete')
def after_job_result_delete(mapper, connection, job_result):
    event = 'user_{}_patch'.format(job_result.job.user_id)
    jsonpatch = [
        {
            'op': 'remove',
            'path': '/jobs/{}/results/{}'.format(job_result.job_id,
                                                 job_result.id)
        }
    ]
    room = 'user_{}'.format(job_result.job.user_id)
    socketio.emit(event, jsonpatch, room=room)