module Web.View.Hubs.BottleneckDashboard where

import Web.Types
import Generated.Types
import IHP.Prelude
import IHP.ViewPrelude
import Web.Routes ()
import Data.Time.Clock (diffUTCTime, getCurrentTime)

data BottleneckDashboardView = BottleneckDashboardView
    { hub         :: !Hub
    , widgets     :: ![Widget]
    , bottlenecks :: ![BottleneckRecord]
    }

instance View BottleneckDashboardView where
    html BottleneckDashboardView { .. } = [hsx|
        <div class="flex items-center justify-between mb-6">
            <div>
                <h1 class="text-2xl font-semibold">Bottleneck Dashboard</h1>
                <p class="text-sm text-gray-500">{hub.name}</p>
            </div>
            <div class="flex gap-2">
                <a href={DetectBottlenecksAction (hub.id)}
                   class="text-sm bg-indigo-600 text-white px-3 py-1.5 rounded hover:bg-indigo-700">
                    Detect
                </a>
                <a href={ShowHubAction (hub.id)}
                   class="text-sm border border-gray-300 px-3 py-1.5 rounded hover:bg-gray-50">
                    ← Hub
                </a>
            </div>
        </div>

        {forEach stages renderStageSection}

        {if null bottlenecks then noBottlenecksMsg else mempty}
    |]
      where
        stages = ["candidate", "requirement", "decision", "observation"] :: [Text]
        stageLabel s = case s of
            "candidate"   -> "Stale Candidates (>30 days open)"
            "requirement" -> "Requirements Without Decision (>60 days)"
            "decision"    -> "Decisions Without Deployment (>30 days)"
            "observation" -> "Deployments Without Outcome Signal (>14 days)"
            _             -> s

        active = filter (\b -> isNothing b.resolvedAt) bottlenecks

        renderStageSection :: Text -> Html
        renderStageSection stage =
            let stageBNs = filter (\b -> b.stage == stage) active
            in if null stageBNs
               then mempty
               else [hsx|
                <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">{stageLabel stage}</h2>
                    <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">Subject</th>
                                <th class="text-left px-3 py-2 font-medium text-gray-600">Stalled Since</th>
                                <th class="text-left px-3 py-2 font-medium text-gray-600">Severity</th>
                                <th class="px-3 py-2"></th>
                            </tr>
                        </thead>
                        <tbody class="divide-y divide-gray-100">
                            {forEach stageBNs renderRow}
                        </tbody>
                    </table>
                </div>
                |]

        renderRow :: BottleneckRecord -> Html
        renderRow b = [hsx|
            <tr class="hover:bg-gray-50">
                <td class="px-3 py-2 font-mono text-xs text-gray-500">{show b.subjectId}</td>
                <td class="px-3 py-2 text-xs text-gray-500">{show b.stalledSince}</td>
                <td class="px-3 py-2">
                    <span class={severityBadge b.severity <> " text-xs px-2 py-0.5 rounded font-medium"}>
                        {b.severity}
                    </span>
                </td>
                <td class="px-3 py-2 text-right">
                    <a href={ResolveBottleneckAction (b.id)}
                       class="text-xs text-indigo-600 hover:underline">Resolve</a>
                </td>
            </tr>
            |]

noBottlenecksMsg :: Html
noBottlenecksMsg = [hsx|<p class="text-sm text-gray-400 mt-4">No active bottlenecks detected.</p>|]

severityBadge :: Text -> Text
severityBadge s = case s of
    "critical" -> "bg-red-100 text-red-800"
    "high"     -> "bg-orange-100 text-orange-800"
    "medium"   -> "bg-yellow-100 text-yellow-800"
    _          -> "bg-gray-100 text-gray-600"