import json
import random
import math
from time import sleep

from server import *

@app.route('/internal/jobs/overview')
@register_navbar('Jobs', iconlib='fa', icon='suitcase', group='weitere')
@mod_required
def jobs_overview():
	page = max(0, int(request.args.get('page', 0)))
	pagesize = min(500, int(request.args.get('pagesize', 50)))
	worker = query('SELECT * FROM worker ORDER BY last_ping DESC')

	# get filter options
	filter_values = {
			'type': query('SELECT distinct type FROM jobs'),
			'state': query('SELECT distinct state FROM jobs'),
			'worker': query('SELECT distinct worker FROM jobs')}

	# parse filter
	filter = {
			'type': request.args.get('type', '%'),
			'state': request.args.get('state', 'failed'),
			'worker': request.args.get('worker', '%')}

	condition_values = []
	if filter['worker'] == '%':
		condition = 'WHERE (type like ?) AND (state like ?)'
		condition_values.extend([filter['type'], filter['state']])
	else:
		condition = 'WHERE (type like ?) AND (worker like ?) AND (state like ?)'
		condition_values.extend([filter['type'], filter['worker'], filter['state']])
	pagecount = math.ceil(query(f'SELECT count(id) as count FROM jobs {condition}',
		*condition_values)[0]['count']/pagesize)
	jobs = query(f'SELECT * FROM jobs \
			{condition} \
			ORDER BY "time_created" DESC LIMIT ? OFFSET ?',
			*[*condition_values, pagesize, page*pagesize])
	active_streams = query('SELECT lectures.*, \'course\' AS sep, courses.*, \'job\' AS sep, jobs.* FROM lectures \
			JOIN courses ON (courses.id = lectures.course_id) \
			JOIN jobs ON (jobs.id = lectures.stream_job) WHERE lectures.stream_job IS NOT NULL')
	for stream in active_streams:
		try:
			stream['destbase'] = json.loads((stream['job']['data'] or '{}')).get('destbase')
		except: #pylint: disable=bare-except
			pass
	return render_template('jobs_overview.html',
			worker=worker,
			jobs=jobs,
			filter_values=filter_values,
			filter=filter,
			page=page,
			pagesize=pagesize,
			pagecount=pagecount,
			active_streams=active_streams)

@app.route('/internal/jobs/action/<action>', methods=['GET', 'POST'])
@app.route('/internal/jobs/action/<action>/<jobid>', methods=['GET', 'POST'])
@mod_required
@csrf_protect
def jobs_action(action, jobid=None):
	if action == 'clear_failed':
		if jobid:
			query('UPDATE jobs SET state = \'deleted\' WHERE state = \'failed\' AND id = ?', jobid)
		else:
			query('UPDATE jobs SET state = \'deleted\' WHERE state = \'failed\'')
	elif action == 'retry_failed':
		if jobid:
			query('UPDATE jobs SET state = \'ready\', canceled = false WHERE state = \'failed\' AND id = ?', jobid)
		else:
			query('UPDATE jobs SET state = \'ready\', canceled = false WHERE state = \'failed\'')
	elif action == 'copy' and jobid:
		query("INSERT INTO jobs (type, priority, queue, state, data, time_created) \
				SELECT type, priority, queue, 'ready', data, ? FROM jobs where id = ?",
				datetime.now(), jobid)
	elif action == 'delete' and jobid:
		query('UPDATE jobs SET state = \'deleted\' WHERE id = ?', jobid)
	elif action == 'cancel' and jobid:
		cancel_job(jobid)
	return redirect(request.values.get('ref', url_for('jobs_overview')))

@app.route('/internal/jobs/api/job/<int:id>/ping', methods=['GET', 'POST'])
@api_token_required('JOBS_API_KEY')
def jobs_ping(id):
	hostname = request.values['host']
	status = json.dumps(json.loads(request.values['status']), default=date_json_handler)
	state = request.values['state']
	if state == 'finished':
		query('UPDATE jobs SET time_finished = ?, status = ?, state = \'finished\' where id = ?', datetime.now(), status, id)
	else:
		query('UPDATE jobs SET worker = ?, last_ping = ?, status = ?, state = ? where id = ?', hostname, datetime.now(), status, state, id)
	job_handler_handle(id, state)
	job = query('SELECT * FROM jobs WHERE id = ?', id, nlfix=False)[0]
	if job['canceled']:
		return 'Job canceled', 205
	return 'OK', 200

@app.route('/internal/jobs/api/worker/<hostname>/schedule', methods=['POST'])
@api_token_required('JOBS_API_KEY')
def jobs_schedule(hostname):
	if query("SELECT hostname FROM worker WHERE hostname = ?", hostname):
		query("UPDATE worker SET last_ping = ? WHERE hostname = ?", datetime.now(), hostname)
	else:
		query("INSERT INTO worker (hostname, last_ping) VALUES (?, ?)", hostname, datetime.now())
	hostdata = request.get_json()
	if not hostdata:
		return 'no hostdata sent', 400
	job = None
	tries = 0
	while not job:
		try:
			modify("BEGIN")
			for i in query('SELECT * FROM jobs WHERE state = \'ready\' ORDER BY priority DESC'):
				if i['type'] in hostdata['jobtypes'] and i['queue'] in hostdata['queues']:
					job = i
					break
			if not job:
				return 'no jobs', 503
			modify('UPDATE jobs SET state=\'scheduled\', worker = ?, time_scheduled = ? WHERE id = ?', hostname, datetime.now(), job['id'])
			modify("COMMIT")
		except: #pylint: disable=bare-except
			tries += 1
			job = None
			sleep(random.random())
			if tries > 10:
				return 'no jobs', 503

	return Response(json.dumps(job, default=date_json_handler), mimetype='application/json')

@app.route('/internal/jobs/add/forward', methods=['GET', 'POST'])
@mod_required
@csrf_protect
def add_forward_job():
	schedule_job('live_forward', {'src': request.values['src'],
			'dest': request.values['dest'], 'format': 'flv'}, priority=9)
	return redirect(request.values.get('ref', url_for('jobs_overview')))