module Web.Controller.HubRegistry where

-- Hub Registry: browsable view over hub_capability_manifests + hub_health_snapshots + hubs
-- No HubRegistry table — this is a view over existing Phase 9 data.

import Web.Types
import Web.View.HubRegistry.Index
import Web.View.HubRegistry.Show
import Generated.Types
import IHP.Prelude
import IHP.ControllerPrelude

-- | Aggregated row for the hub registry index.
data HubRegistryRow = HubRegistryRow
    { hub             :: !Hub
    , mManifest       :: !(Maybe HubCapabilityManifest)
    , mLatestSnapshot :: !(Maybe HubHealthSnapshot)
    }

-- | GAAF compliance status derived from manifest and registry.
data GaafStatus
    = GaafCompliant          -- active manifest, all declared types registered
    | GaafNoManifest         -- hub has no active manifest
    | GaafDraftOnly          -- hub has a draft but no active manifest
    deriving (Eq, Show)

gaafStatus :: Maybe HubCapabilityManifest -> GaafStatus
gaafStatus Nothing  = GaafNoManifest
gaafStatus (Just m)
    | m.status == "active" = GaafCompliant
    | m.status == "draft"  = GaafDraftOnly
    | otherwise            = GaafNoManifest

instance Controller HubRegistryController where
    beforeAction = ensureIsUser

    action HubRegistryAction = autoRefresh do
        hubs <- query @Hub |> orderByAsc #name |> fetch
        registryRows <- mapM buildRow hubs
        render IndexView { registryRows }

    action ShowHubRegistryAction { hubId } = do
        hub <- fetch hubId
        mManifest <- query @HubCapabilityManifest
            |> filterWhere (#hubId, hubId)
            |> filterWhere (#status, "active")
            |> fetchOneOrNothing
        healthHistory <- query @HubHealthSnapshot
            |> filterWhere (#hubId, hubId)
            |> orderByDesc #computedAt
            |> limit 10
            |> fetch
        adoptedPatterns <- sqlQuery
            "SELECT wp.id, wp.name, wp.widget_type, wp.hub_id, \
            \       pa.id AS adoption_id, pa.is_version_pinned, pa.adopted_at \
            \ FROM pattern_adoptions pa \
            \ JOIN widget_patterns wp ON wp.id = pa.widget_pattern_id \
            \ WHERE pa.adopting_hub_id = ? \
            \ ORDER BY pa.adopted_at DESC"
            (Only hubId)
        render ShowView { hub, mManifest, healthHistory, adoptedPatterns }

-- | Build a HubRegistryRow for a hub by fetching its active manifest and latest snapshot.
buildRow :: (?modelContext :: ModelContext) => Hub -> IO HubRegistryRow
buildRow hub = do
    mManifest <- query @HubCapabilityManifest
        |> filterWhere (#hubId, hub.id)
        |> filterWhere (#status, "active")
        |> fetchOneOrNothing
    mLatestSnapshot <- query @HubHealthSnapshot
        |> filterWhere (#hubId, hub.id)
        |> orderByDesc #computedAt
        |> limit 1
        |> fetchOneOrNothing
    pure HubRegistryRow { hub, mManifest, mLatestSnapshot }