-- sql/133 — One-directional reach-tier substitution policy
--
-- Decision (Rene, 2026-07-07): a higher-reach optic may satisfy a lower-reach
-- requirement (e.g. a 40km ER can serve where a 10km LR is asked for), never the
-- reverse — the shorter-reach part cannot close the link budget on a longer run.
-- ZR/coherent/amplified tiers are explicitly EXCLUDED from this automatic rule:
-- those can overload a short-haul receiver without an attenuator, which is a real
-- power-budget calculation, not a simple tier comparison. Those stay in manual review.
--
-- Result is tagged as its own status (compatible_superset), never merged into
-- auto_approved/exact-spec matches, so downstream consumers (Fossy/Beo/Pulso, pricing)
-- can distinguish "identical spec" from "safe higher-spec substitute" — they usually
-- differ in price and are not a like-for-like swap.

BEGIN;

-- widen the status check (additive — existing values still valid)
ALTER TABLE transceiver_equivalences DROP CONSTRAINT transceiver_equivalences_status_check;
ALTER TABLE transceiver_equivalences ADD CONSTRAINT transceiver_equivalences_status_check
  CHECK (status::text = ANY (ARRAY['pending','approved','rejected','auto_approved','compatible_superset']::text[]));

UPDATE transceiver_equivalences e
   SET status      = 'compatible_superset',
       confidence  = GREATEST(e.confidence, 0.75),
       match_notes = COALESCE(e.match_notes,'') || ' | sql/133: ' ||
         CASE WHEN fx.reach_meters > cx.reach_meters
              THEN 'flexoptix ('||tip_reach_tier(fx.reach_meters)||') covers competitor requirement ('||tip_reach_tier(cx.reach_meters)||')'
              ELSE 'competitor ('||tip_reach_tier(cx.reach_meters)||') covers flexoptix requirement ('||tip_reach_tier(fx.reach_meters)||')'
         END || ' — reach-tier substitute, not identical spec',
       updated_at  = now()
  FROM transceivers fx, transceivers cx
 WHERE e.flexoptix_id = fx.id
   AND e.competitor_id = cx.id
   AND e.status = 'pending'
   AND fx.form_factor = cx.form_factor
   AND fx.speed_gbps  = cx.speed_gbps
   AND fx.fiber_type IS NOT DISTINCT FROM cx.fiber_type
   AND fx.reach_meters >= 10 AND cx.reach_meters >= 10
   AND tip_extract_wavelength_nm(fx.wavelengths) IS NOT NULL
   AND tip_extract_wavelength_nm(cx.wavelengths) IS NOT NULL
   AND abs(tip_extract_wavelength_nm(fx.wavelengths) - tip_extract_wavelength_nm(cx.wavelengths)) <= 10
   AND tip_reach_tier(fx.reach_meters) <> tip_reach_tier(cx.reach_meters)
   AND tip_reach_tier(fx.reach_meters) <> 'ZR'
   AND tip_reach_tier(cx.reach_meters) <> 'ZR';

COMMIT;