-- jeden řádek planning_interval jako jsonb pro aktivní plán a slot offset (Prague 15min)

create or replace function ems.fn_planning_interval_at_offset(
  p_site_id int,
  p_offset_slots int default 0
)
returns jsonb
language sql
stable
as $fn$
  select to_jsonb(pi)
  from ems.planning_interval pi
  join ems.planning_run pr on pr.id = pi.run_id
  where pr.site_id = p_site_id
    and pr.status = 'active'
    and pi.interval_start = ems.fn_planning_slot_boundary_prague(p_offset_slots)
  limit 1;
$fn$;

create or replace function ems.fn_planning_max_effective_charge_w(p_site_id int)
returns int
language sql
stable
as $fn$
  select coalesce(
    least(
      coalesce(ai.max_battery_charge_w, ai.max_charge_power_w),
      coalesce(
        ab.bms_max_charge_w,
        case when ab.max_charge_c_rate is not null
          then (ab.max_charge_c_rate * ab.usable_capacity_wh)::bigint
        end,
        coalesce(ai.max_battery_charge_w, ai.max_charge_power_w)
      )
    )::int,
    0
  )
  from ems.asset_battery ab
  join ems.asset_inverter ai on ai.id = ab.inverter_id and ai.site_id = ab.site_id
  where ab.site_id = p_site_id
    and ai.controllable is true
    and ai.active is true
  order by ab.id
  limit 1;
$fn$;