module Web.View.FederatedGovernance.Dashboard where

import Web.Types
import Generated.Types
import IHP.Prelude
import IHP.ViewPrelude
import Web.Routes ()
import qualified Data.List as List

data FederatedGovernanceDashboardView = FederatedGovernanceDashboardView
    { hubs            :: ![Hub]
    , widgets         :: ![Widget]
    , ownerships      :: ![WidgetOwnership]
    , rules           :: ![HubRoutingRule]
    , routedCandidates :: ![RequirementCandidate]
    , overlays        :: ![FederatedPolicyOverlay]
    , allDecisions    :: ![DecisionRecord]
    , allPolicies     :: ![PolicyReference]
    , stewards        :: ![StewardshipRole]
    , recentArchives  :: ![ArchiveRecord]
    }

instance View FederatedGovernanceDashboardView where
    html FederatedGovernanceDashboardView { .. } = [hsx|
        <div class="flex items-center justify-between mb-6">
            <h1 class="text-2xl font-semibold">Federated Governance</h1>
            <a href={PolicyComplianceDashboardAction}
               class="text-sm text-indigo-600 hover:underline">Policy Compliance →</a>
        </div>

        <div class="grid grid-cols-1 gap-6 lg:grid-cols-2">
            {panel1Ownership}
            {panel2Routing}
            {panel3PolicyCompliance}
            {panel4Stewardship}
            {panel5Archive}
        </div>
    |]
      where
        -- ── Panel 1: Ownership coverage ──────────────────────────────────
        totalWidgets     = length widgets
        ownedWidgetIds   = List.nub (map (.widgetId) ownerships)
        ownedCount       = length ownedWidgetIds
        localCount       = length (filter (\o -> o.ownershipType == "local")     ownerships)
        delegatedCount   = length (filter (\o -> o.ownershipType == "delegated") ownerships)
        globalCount      = length (filter (\o -> o.ownershipType == "global")    ownerships)
        ownershipPct :: Int
        ownershipPct     = if totalWidgets == 0 then 0 else (ownedCount * 100) `div` totalWidgets

        panel1Ownership = [hsx|
            <div class="bg-white rounded-lg border border-gray-200 p-5">
                <div class="flex items-center justify-between mb-4">
                    <h2 class="font-medium text-gray-800">Ownership Coverage</h2>
                    <a href={WidgetOwnershipsAction}
                       class="text-xs text-blue-600 hover:underline">View all →</a>
                </div>
                <div class="flex gap-6 mb-4">
                    <div class="text-center">
                        <div class="text-3xl font-bold text-gray-900">{show ownedCount}</div>
                        <div class="text-xs text-gray-500">of {show totalWidgets} widgets owned</div>
                    </div>
                    <div class="text-center">
                        <div class="text-3xl font-bold text-indigo-600">{show ownershipPct}%</div>
                        <div class="text-xs text-gray-500">coverage</div>
                    </div>
                </div>
                <div class="flex gap-3 text-xs">
                    <span class="bg-gray-100 text-gray-700 px-2 py-1 rounded">
                        local: {show localCount}
                    </span>
                    <span class="bg-blue-100 text-blue-700 px-2 py-1 rounded">
                        delegated: {show delegatedCount}
                    </span>
                    <span class="bg-purple-100 text-purple-700 px-2 py-1 rounded">
                        global: {show globalCount}
                    </span>
                </div>
            </div>
            |]

        -- ── Panel 2: Routing activity ─────────────────────────────────────
        activeRulesCount  = length rules
        routedCount       = length routedCandidates
        hubName hid       = maybe (show hid) (.name) (find (\h -> toUUID h.id == hid) hubs)

        panel2Routing = [hsx|
            <div class="bg-white rounded-lg border border-gray-200 p-5">
                <div class="flex items-center justify-between mb-4">
                    <h2 class="font-medium text-gray-800">Routing Activity</h2>
                    <a href={HubRoutingRulesAction}
                       class="text-xs text-blue-600 hover:underline">Rules →</a>
                </div>
                <div class="flex gap-6 mb-4">
                    <div class="text-center">
                        <div class="text-3xl font-bold text-gray-900">{show activeRulesCount}</div>
                        <div class="text-xs text-gray-500">active rules</div>
                    </div>
                    <div class="text-center">
                        <div class="text-3xl font-bold text-green-600">{show routedCount}</div>
                        <div class="text-xs text-gray-500">routed (30 days)</div>
                    </div>
                </div>
                {renderRulesSection rules}
            </div>
            |]

        renderRulesSection :: [HubRoutingRule] -> Html
        renderRulesSection [] = [hsx|<p class="text-xs text-gray-400">No active routing rules.</p>|]
        renderRulesSection rs = [hsx|
            <div class="space-y-1">
                {forEach (take 5 rs) renderRuleRow}
            </div>
        |]

        renderRuleRow :: HubRoutingRule -> Html
        renderRuleRow r = [hsx|
            <div class="flex items-center gap-2 text-xs text-gray-600">
                <span class="font-medium">{hubName r.sourceHubId}</span>
                <span class="text-gray-400">→</span>
                <span class="font-medium">{hubName r.targetHubId}</span>
                {maybe mempty renderMatchCategory r.matchCategory}
            </div>
            |]

        renderMatchCategory :: Text -> Html
        renderMatchCategory c = [hsx|<span class="text-gray-400">({c})</span>|]

        -- ── Panel 3: Policy compliance ────────────────────────────────────
        activeOverlaysCount  = length overlays
        decisionIdsWithPolicy = List.nub $ map (Just . (.decisionId)) allPolicies
        coveredDecisions     = length $ filter (\d -> Just d.id `elem` decisionIdsWithPolicy) allDecisions
        totalDecisions       = length allDecisions
        policyPct :: Int
        policyPct            = if totalDecisions == 0 then 0
                               else (coveredDecisions * 100) `div` totalDecisions

        panel3PolicyCompliance = [hsx|
            <div class="bg-white rounded-lg border border-gray-200 p-5">
                <div class="flex items-center justify-between mb-4">
                    <h2 class="font-medium text-gray-800">Policy Compliance</h2>
                    <a href={PolicyComplianceDashboardAction}
                       class="text-xs text-blue-600 hover:underline">Dashboard →</a>
                </div>
                <div class="flex gap-6 mb-4">
                    <div class="text-center">
                        <div class="text-3xl font-bold text-gray-900">{show activeOverlaysCount}</div>
                        <div class="text-xs text-gray-500">active overlays</div>
                    </div>
                    <div class="text-center">
                        <div class="text-3xl font-bold text-indigo-600">{show policyPct}%</div>
                        <div class="text-xs text-gray-500">decision coverage</div>
                    </div>
                </div>
                {renderOverlaysList overlays}
            </div>
            |]

        -- ── Panel 4: Stewardship coverage ─────────────────────────────────
        hubsWithStewards  = List.nub (map (.hubId) stewards)
        stewardedCount    = length hubsWithStewards
        totalHubs         = length hubs
        hubsWithNoSteward = filter (\h -> toUUID h.id `notElem` hubsWithStewards) hubs

        panel4Stewardship = [hsx|
            <div class="bg-white rounded-lg border border-gray-200 p-5">
                <div class="flex items-center justify-between mb-4">
                    <h2 class="font-medium text-gray-800">Stewardship Coverage</h2>
                    <a href={StewardshipRolesAction}
                       class="text-xs text-blue-600 hover:underline">Roles →</a>
                </div>
                <div class="flex gap-6 mb-4">
                    <div class="text-center">
                        <div class="text-3xl font-bold text-gray-900">{show stewardedCount}</div>
                        <div class="text-xs text-gray-500">of {show totalHubs} hubs stewarded</div>
                    </div>
                    <div class="text-center">
                        <div class="text-3xl font-bold text-amber-600">{show (length hubsWithNoSteward)}</div>
                        <div class="text-xs text-gray-500">hubs unassigned</div>
                    </div>
                </div>
                {renderUnstewarded hubsWithNoSteward}
            </div>
            |]

        -- ── Panel 5: Archive activity ─────────────────────────────────────
        archiveByType = List.sortBy (\a b -> compare (fst a) (fst b))
                      $ map (\grp -> ((head grp).subjectType, length grp))
                      $ List.groupBy (\a b -> a.subjectType == b.subjectType)
                      $ List.sortBy (\a b -> compare a.subjectType b.subjectType) recentArchives

        panel5Archive = [hsx|
            <div class="bg-white rounded-lg border border-gray-200 p-5 lg:col-span-2">
                <div class="flex items-center justify-between mb-4">
                    <h2 class="font-medium text-gray-800">Archive Activity (90 days)</h2>
                    <a href={ArchiveRecordsAction}
                       class="text-xs text-blue-600 hover:underline">All records →</a>
                </div>
                {renderArchiveActivity recentArchives archiveByType}
            </div>
            |]

renderOverlaysList :: [FederatedPolicyOverlay] -> Html
renderOverlaysList [] = [hsx|<p class="text-xs text-gray-400">No active policy overlays.</p>|]
renderOverlaysList overlays = [hsx|
    <div class="space-y-1">
        {forEach overlays renderOverlayTitle}
    </div>
|]

renderOverlayTitle :: FederatedPolicyOverlay -> Html
renderOverlayTitle o = [hsx|<div class="text-xs text-gray-600 truncate">{o.title}</div>|]

renderUnstewarded :: [Hub] -> Html
renderUnstewarded [] = [hsx|<p class="text-xs text-green-600">All hubs have active stewards.</p>|]
renderUnstewarded hs = [hsx|
    <div>
        <p class="text-xs text-gray-500 mb-1">Hubs without stewards:</p>
        <div class="flex flex-wrap gap-1">
            {forEach hs renderUnstewardedHub}
        </div>
    </div>
|]

renderUnstewardedHub :: Hub -> Html
renderUnstewardedHub h = [hsx|<span class="text-xs bg-amber-100 text-amber-700 px-2 py-0.5 rounded">{h.name}</span>|]

renderArchiveActivity :: [ArchiveRecord] -> [(Text, Int)] -> Html
renderArchiveActivity [] _ = [hsx|<p class="text-sm text-gray-400">No artifacts archived in the last 90 days.</p>|]
renderArchiveActivity archives byType = [hsx|
    <div class="flex items-center gap-3 mb-2">
        <div class="text-3xl font-bold text-gray-900">{show (length archives)}</div>
        <div class="text-xs text-gray-500">total archived artifacts</div>
    </div>
    <div class="flex flex-wrap gap-2">
        {forEach byType renderArchiveTypeChip}
    </div>
|]

renderArchiveTypeChip :: (Text, Int) -> Html
renderArchiveTypeChip (typ, cnt) = [hsx|
    <span class="text-sm bg-amber-50 border border-amber-200 text-amber-800 px-3 py-1 rounded">
        {typ}: {show cnt}
    </span>
|]