module Application.Helper.ModelRouter where

-- IHF Phase 11 — Advanced AI Federation (IHUB-WP-0012 T04)
-- Resolve the AgentRegistration to use for a hub + task type.

import IHP.Prelude
import IHP.ControllerPrelude
import Generated.Types
import Web.Routes ()
import Database.PostgreSQL.Simple (Only(..))

-- | Resolve the highest-priority active AgentRegistration for the given hub
-- and task type.  Returns Nothing if no matching policy exists (callers should
-- fall back gracefully or surface an error to the operator).
resolveAgent ::
    (?modelContext :: ModelContext) =>
    Id Hub -> Text -> IO (Maybe AgentRegistration)
resolveAgent hubId taskType = do
    rows <- sqlQuery
        "SELECT mrp.agent_registration_id \
        \ FROM model_routing_policies mrp \
        \ WHERE mrp.hub_id = ? AND mrp.task_type = ? AND mrp.is_active = TRUE \
        \ ORDER BY mrp.priority DESC \
        \ LIMIT 1"
        (hubId, taskType)
    case rows of
        [Only agentId] -> fetchOneOrNothing agentId
        _              -> pure Nothing

-- | Return all active AgentRegistrations for a hub + task_type ordered by
-- priority (highest first).  Used by CollectiveProposals to fan out.
resolveAllAgents ::
    (?modelContext :: ModelContext) =>
    Id Hub -> Text -> IO [AgentRegistration]
resolveAllAgents hubId taskType = do
    rows <- sqlQuery
        "SELECT mrp.agent_registration_id \
        \ FROM model_routing_policies mrp \
        \ WHERE mrp.hub_id = ? AND mrp.task_type = ? AND mrp.is_active = TRUE \
        \ ORDER BY mrp.priority DESC"
        (hubId, taskType)
    mapM (fetch . (\(Only i) -> i)) rows