module Application.Helper.View where

import IHP.ViewPrelude
import Generated.Types
import Web.Types
import Web.Routes ()
import IHP.View.Form.Select (CanSelect(..))

-- | CanSelect instance for (Text, Text) tuples where fst is the label
-- and snd is the value. Used by selectField when options are plain text pairs.
instance CanSelect (Text, Text) where
    type SelectValue (Text, Text) = Text
    selectLabel = fst
    selectValue = snd

-- | Widget Envelope — wraps any widget's rendered content with IHF governance metadata.
--
-- Every interactive element that is part of the governed widget registry should
-- be wrapped with this helper. It injects the stable data-* attributes that the
-- client-side event capture script reads to identify the widget without coupling
-- to implementation details.
--
-- The envelope is validated against the v1.0 EnvelopeEmissionContract at render
-- time. Missing required attributes are surfaced as an inline warning banner
-- (development) rather than a hard failure, so layout is preserved in production.
--
-- Required attributes (contract v1.0):
--   data-widget-id    — stable UUID from the widget registry
--   data-view-context — logical UI location
--   data-hub-id       — owning hub UUID
--
-- Usage:
--
-- @
-- widgetEnvelope widget [hsx|
--     <button>Click me</button>
-- |]
-- @
widgetEnvelope :: Widget -> Html -> Html
widgetEnvelope widget inner =
    let warnings = envelopeContractWarnings widget
    in [hsx|
    <div
        class="ihf-widget"
        data-widget-id={tshow widget.id}
        data-widget-type={widget.widgetType}
        data-hub-id={tshow widget.hubId}
        data-capability-ref={fromMaybe "" widget.capabilityRef}
        data-view-context={fromMaybe "" widget.viewContext}
        data-policy-scope={widget.policyScope}
        data-widget-version={tshow widget.version}
    >
        {renderEnvelopeWarnings warnings}
        {inner}
        <div class="ihf-widget-controls mt-2">
            <a href={WidgetAnnotationsAction (widget.id)}
               class="ihf-annotate-btn text-xs text-gray-400 hover:text-indigo-600 border border-gray-200
                      rounded px-2 py-0.5 hover:border-indigo-300">
                Annotate
            </a>
        </div>
    </div>
|]

-- | Validate a Widget record against EnvelopeEmissionContract v1.0 required
-- attributes. Returns a list of human-readable warning messages for any
-- attribute that is missing or empty. An empty list means the widget is
-- contract-compliant.
envelopeContractWarnings :: Widget -> [Text]
envelopeContractWarnings widget = catMaybes
    [ if isNothing widget.viewContext || widget.viewContext == Just ""
        then Just "envelope:v1.0 — data-view-context is missing (set widget.viewContext)"
        else Nothing
    -- data-widget-id and data-hub-id are always present (non-nullable fields)
    ]

renderEnvelopeWarnings :: [Text] -> Html
renderEnvelopeWarnings [] = mempty
renderEnvelopeWarnings ws = [hsx|
    <div class="bg-amber-50 border border-amber-200 rounded px-3 py-1 mb-1 text-xs text-amber-700">
        <strong>Envelope contract warning:</strong>
        {forEach ws renderWarningLine}
    </div>
|]

renderWarningLine :: Text -> Html
renderWarningLine w = [hsx|<div>{w}</div>|]

-- | Status badge colour for WidgetAdapterSpec and contract status values.
adapterStatusBadge :: Text -> Text
adapterStatusBadge "active"     = "bg-green-100 text-green-800"
adapterStatusBadge "draft"      = "bg-yellow-100 text-yellow-800"
adapterStatusBadge "deprecated" = "bg-gray-100 text-gray-500"
adapterStatusBadge "superseded" = "bg-gray-100 text-gray-400"
adapterStatusBadge _            = "bg-gray-100 text-gray-600"