package session

const (
	activateStateCte = `
insert into session_state
with not_active as (
	select session_id, 'active' as state
	from 
		session s,
		session_state ss
	where 
		s.public_id = ss.session_id and
		ss.state = 'pending' and 
		ss.session_id = $1 and 
		s.version = $2 and
		s.public_id not in(select session_id from session_state where session_id = $1 and state = 'active') 
)
select * from not_active;
`

	terminateSessionCte = `
insert into session_state
with terminated as (
	select s.public_id, 'terminated' as state
	from 
		session s
	where 
		s.version = $2  and
		s.public_id in (
			-- sessions without any connections
			select s.public_id 
			from 
				session s
			left join session_connection sc on sc.session_id = s.public_id 
			where 
				sc.session_id is null
				and s.public_id = $1
			union
			-- sessions where all connections are closed
			select s.public_id 
			from
				session s,
				session_connection c,
				session_connection_state cs
			where
				s.public_id = c.session_id and
				c.public_id = cs.connection_id and
				cs.state = 'closed' and 
				s.public_id = $1
		) 
)
select * from terminated;
`
	createConnectionCte = `
insert into session_connection (
	session_id, 
	public_id, 
	client_tcp_address, 
	client_tcp_port,
	endpoint_tcp_address,
	endpoint_tcp_port
)
with active_session as ( 
	select 
		$1 as session_id,
		$2 as public_id,
		$3::inet as client_tcp_address,
		$4::int as client_tcp_port,
		$5::inet as endpoint_tcp_address,
		$6::int as endpoint_tcp_port
	from
		session s
	where
		-- check that there's a state of active
		s.public_id in (
			select 
				ss.session_id 
			from 
				session_state ss
			where 
				ss.session_id = $1 and 
				ss.state = 'active'
		) and 
		-- check that there are no cancelling or terminated states
		s.public_id not in(
			select 
				ss.session_id 
			from 
				session_state ss 
			where
				ss.session_id = $1 and 
				ss.state in('cancelling', 'terminated') 			
		)
)
select * from active_session;
`
)