module Web.View.Hubs.AdapterCompatibilityDashboard where

import Web.Types
import Generated.Types
import IHP.Prelude
import IHP.ViewPrelude
import Web.Routes ()
import Application.Helper.View (adapterStatusBadge)
import Data.List (nub, sortBy)
import Data.Ord (comparing, Down(..))

data AdapterCompatibilityDashboardView = AdapterCompatibilityDashboardView
    { hub        :: !Hub
    , specs      :: ![WidgetAdapterSpec]
    , widgets    :: ![Widget]
    , envelopes  :: ![EnvelopeEmissionContract]
    , reportings :: ![InteractionReportingContract]
    }

instance View AdapterCompatibilityDashboardView where
    html AdapterCompatibilityDashboardView { .. } = [hsx|
        <div class="flex items-center justify-between mb-6">
            <div>
                <h1 class="text-2xl font-semibold">Adapter Compatibility Dashboard</h1>
                <p class="text-sm text-gray-500">{hub.name}</p>
            </div>
            <a href={ShowHubAction (hub.id)}
               class="text-sm text-indigo-600 hover:underline">← Hub</a>
        </div>

        <!-- Panel 1: Adapter summary -->
        <h2 class="text-base font-semibold mb-3">Adapter Specs</h2>
        <div class="grid grid-cols-3 gap-4 mb-6">
            {kpiCard "Active"     (show activeCount)     "text-green-700"}
            {kpiCard "Draft"      (show draftCount)      "text-yellow-700"}
            {kpiCard "Deprecated" (show deprecatedCount) "text-gray-500"}
        </div>

        <!-- Panel 2: Widget coverage -->
        <div class="bg-white rounded-lg border border-gray-200 p-5 mb-4">
            <h2 class="text-sm font-semibold text-gray-700 mb-3">Widget Coverage</h2>
            <div class="flex gap-6 mb-3 text-sm">
                <div>
                    <span class="font-medium">{length widgets}</span>
                    <span class="text-gray-500 ml-1">total widgets</span>
                </div>
                <div>
                    <span class="font-medium text-teal-700">{adapterBacked}</span>
                    <span class="text-gray-500 ml-1">adapter-backed</span>
                </div>
                <div>
                    <span class="font-medium text-indigo-700">{nativeCount}</span>
                    <span class="text-gray-500 ml-1">native IHP</span>
                </div>
            </div>
            {renderCoverageBar adapterBacked nativeCount}
            {forEach coverageBySpec (renderCoverageSpecRow specs)}
        </div>

        <!-- Panel 3: Contract versions in use -->
        <div class="bg-white rounded-lg border border-gray-200 p-5 mb-4">
            <h2 class="text-sm font-semibold text-gray-700 mb-3">Active Contracts</h2>
            <div class="flex gap-6 text-sm">
                <div>
                    <span class="text-gray-500 mr-1">Envelope:</span>
                    {forEach envelopes renderEnvelopeLink}
                </div>
                <div>
                    <span class="text-gray-500 mr-1">Reporting:</span>
                    {forEach reportings renderReportingLink}
                </div>
            </div>
        </div>

        <!-- Panel 4: Unassigned widgets -->
        <div class="bg-white rounded-lg border border-gray-200 p-5 mb-4">
            <h2 class="text-sm font-semibold text-gray-700 mb-3">
                Unassigned Widgets
                <span class="ml-1 text-xs text-gray-400">(no adapter_spec_id)</span>
            </h2>
            {renderUnassignedWidgets unassignedWidgets}
        </div>

        <!-- Panel 5: Stale adapters -->
        <div class="bg-white rounded-lg border border-gray-200 p-5">
            <h2 class="text-sm font-semibold text-gray-700 mb-3">
                Active Adapter Specs
            </h2>
            {renderActiveSpecsTable activeSpecs}
        </div>
    |]
      where
        activeCount     = length (filter (\s -> s.status == "active") specs)
        draftCount      = length (filter (\s -> s.status == "draft") specs)
        deprecatedCount = length (filter (\s -> s.status == "deprecated") specs)
        activeSpecs     = filter (\s -> s.status == "active") specs

        adapterBacked   = length (filter (\w -> isJust w.adapterSpecId) widgets)
        nativeCount     = length widgets - adapterBacked
        unassignedWidgets = filter (\w -> isNothing w.adapterSpecId) widgets

        -- Count widgets per adapter spec ID
        coverageBySpec :: [(Id WidgetAdapterSpec, Int)]
        coverageBySpec =
            let assigned = [ sid | w <- widgets, Just sid <- [w.adapterSpecId] ]
                specIds  = nub assigned
            in sortBy (comparing (Down . snd))
                 [ (sid, length (filter (== sid) assigned)) | sid <- specIds ]

        renderCoverageSpecRow :: [WidgetAdapterSpec] -> (Id WidgetAdapterSpec, Int) -> Html
        renderCoverageSpecRow ss (sid, cnt) =
            let mSpec = find (\s -> s.id == sid) ss
                label = maybe "(unknown)" (.name) mSpec
            in [hsx|
            <div class="flex items-center gap-3 mt-2 text-xs text-gray-600">
                <span class="bg-purple-100 text-purple-700 px-1.5 py-0.5 rounded">{label}</span>
                <span>{show cnt} widgets</span>
            </div>
            |]

        renderActiveSpecsTable :: [WidgetAdapterSpec] -> Html
        renderActiveSpecsTable [] = [hsx|<p class="text-sm text-gray-400">No active adapter specs.</p>|]
        renderActiveSpecsTable ss = [hsx|
            <table class="w-full text-sm">
                <thead class="bg-gray-50">
                    <tr>
                        <th class="text-left px-3 py-2 font-medium text-gray-600">Adapter</th>
                        <th class="text-left px-3 py-2 font-medium text-gray-600">Framework</th>
                        <th class="text-left px-3 py-2 font-medium text-gray-600">Widgets</th>
                        <th class="text-left px-3 py-2 font-medium text-gray-600">Status</th>
                    </tr>
                </thead>
                <tbody class="divide-y divide-gray-100">
                    {forEach ss renderSpecRow}
                </tbody>
            </table>
        |]

        renderSpecRow :: WidgetAdapterSpec -> Html
        renderSpecRow s =
            let widgetCount = length (filter (\w -> w.adapterSpecId == Just s.id) widgets)
            in [hsx|
            <tr class="hover:bg-gray-50">
                <td class="px-3 py-2">
                    <a href={ShowWidgetAdapterSpecAction (s.id)}
                       class="text-indigo-600 hover:underline">{s.name}</a>
                </td>
                <td class="px-3 py-2">
                    <span class="bg-purple-100 text-purple-700 text-xs px-1.5 py-0.5 rounded">{s.framework}</span>
                </td>
                <td class="px-3 py-2 text-gray-700">{show widgetCount}</td>
                <td class="px-3 py-2">
                    <span class={adapterStatusBadge s.status <> " text-xs px-2 py-0.5 rounded font-medium"}>
                        {s.status}
                    </span>
                </td>
            </tr>
            |]

renderEnvelopeLink :: EnvelopeEmissionContract -> Html
renderEnvelopeLink e = [hsx|
    <a href={ShowEnvelopeEmissionContractAction (e.id)}
       class="font-mono text-indigo-600 hover:underline mr-2">v{e.contractVersion}</a>
|]

renderReportingLink :: InteractionReportingContract -> Html
renderReportingLink r = [hsx|
    <a href={ShowInteractionReportingContractAction (r.id)}
       class="font-mono text-indigo-600 hover:underline mr-2">v{r.contractVersion}</a>
|]

renderUnassignedWidgets :: [Widget] -> Html
renderUnassignedWidgets [] = [hsx|<p class="text-sm text-gray-400">All widgets have adapter assignments.</p>|]
renderUnassignedWidgets ws = [hsx|
    <div class="text-sm text-gray-600 space-y-1">
        {forEach ws renderUnassignedWidgetRow}
    </div>
|]

renderUnassignedWidgetRow :: Widget -> Html
renderUnassignedWidgetRow w = [hsx|
    <div>
        <a href={ShowWidgetAction (w.id)}
           class="text-indigo-600 hover:underline">{w.name}</a>
        <span class="text-xs text-gray-400 ml-2">{w.widgetType}</span>
    </div>
|]

kpiCard :: Text -> Text -> Text -> Html
kpiCard label value textClass = [hsx|
    <div class="bg-white rounded-lg border border-gray-200 p-4">
        <div class="text-xs text-gray-500 mb-1">{label}</div>
        <div class={"text-2xl font-bold " <> textClass}>{value}</div>
    </div>
|]

renderCoverageBar :: Int -> Int -> Html
renderCoverageBar adapted native =
    let total = adapted + native
    in if total == 0
       then mempty
       else
        let adaptedPct = show (round ((fromIntegral adapted / fromIntegral total :: Double) * 100) :: Int) <> "%"
            nativePct  = show (round ((fromIntegral native  / fromIntegral total :: Double) * 100) :: Int) <> "%"
        in [hsx|
        <div class="flex rounded overflow-hidden h-2.5 w-full mb-1">
            <div class="bg-purple-400" style={"width:" <> adaptedPct}></div>
            <div class="bg-indigo-300" style={"width:" <> nativePct}></div>
        </div>
        <div class="flex gap-4 text-xs text-gray-500">
            <span><span class="inline-block w-2 h-2 bg-purple-400 rounded mr-1"></span>Adapter-backed {adaptedPct}</span>
            <span><span class="inline-block w-2 h-2 bg-indigo-300 rounded mr-1"></span>Native IHP {nativePct}</span>
        </div>
        |]