module Web.View.DecisionRecords.Index where

import Web.Types
import Generated.Types
import IHP.Prelude
import IHP.ViewPrelude
import Web.Routes ()

data IndexView = IndexView
    { records        :: ![DecisionRecord]
    , requirements   :: ![Requirement]
    , users          :: ![User]
    , mOutcomeFilter :: !(Maybe Text)
    }

allOutcomes :: [Text]
allOutcomes = ["accepted", "rejected", "deferred", "split", "merged", "reframed"]

instance View IndexView where
    html IndexView { .. } = [hsx|
        <div class="flex items-center justify-between mb-6">
            <h1 class="text-2xl font-semibold">Decision Records</h1>
            <a href={NewDecisionRecordAction}
               class="bg-indigo-600 text-white text-sm px-4 py-2 rounded hover:bg-indigo-700">
                New Decision
            </a>
        </div>

        <!-- Outcome filter tabs -->
        <div class="flex gap-2 mb-5 text-sm flex-wrap">
            <a href={DecisionRecordsAction}
               class={filterTabClass Nothing mOutcomeFilter}>All</a>
            {forEach allOutcomes (renderOutcomeTab mOutcomeFilter)}
        </div>

        {if null records then noDecisionsMsg else renderTable records requirements users}
    |]

noDecisionsMsg :: Html
noDecisionsMsg = [hsx|<p class="text-sm text-gray-400">No decision records found.</p>|]

renderOutcomeTab :: Maybe Text -> Text -> Html
renderOutcomeTab mOutcomeFilter o = [hsx|
    <a href={decisionFilterUrl o}
       class={filterTabClass (Just o) mOutcomeFilter}>{o}</a>
|]

decisionFilterUrl :: Text -> Text
decisionFilterUrl o = "/DecisionRecords?outcome=" <> o

renderTable :: [DecisionRecord] -> [Requirement] -> [User] -> Html
renderTable records reqs users = [hsx|
    <div class="bg-white rounded-lg border border-gray-200 overflow-hidden">
        <table class="w-full text-sm">
            <thead class="bg-gray-50 border-b border-gray-200">
                <tr>
                    <th class="text-left px-4 py-3 font-medium text-gray-600">Title</th>
                    <th class="text-left px-4 py-3 font-medium text-gray-600">Outcome</th>
                    <th class="text-left px-4 py-3 font-medium text-gray-600">Requirement</th>
                    <th class="text-left px-4 py-3 font-medium text-gray-600">Decided By</th>
                    <th class="text-left px-4 py-3 font-medium text-gray-600">Decided At</th>
                </tr>
            </thead>
            <tbody class="divide-y divide-gray-100">
                {forEach records (renderRow reqs users)}
            </tbody>
        </table>
    </div>
|]

renderRow :: [Requirement] -> [User] -> DecisionRecord -> Html
renderRow reqs users dr = [hsx|
    <tr class="hover:bg-gray-50">
        <td class="px-4 py-3">
            <a href={ShowDecisionRecordAction (dr.id)}
               class="text-indigo-600 hover:text-indigo-800 font-medium">{dr.title}</a>
        </td>
        <td class="px-4 py-3">
            <span class={outcomeClass dr.outcome <> " text-xs px-2 py-0.5 rounded font-medium"}>
                {dr.outcome}
            </span>
        </td>
        <td class="px-4 py-3 text-gray-600">
            {linkedReqTitle reqs dr.requirementId}
        </td>
        <td class="px-4 py-3 text-gray-600">
            {userName users dr.decidedBy}
        </td>
        <td class="px-4 py-3 text-gray-400 text-xs">{show dr.decidedAt}</td>
    </tr>
|]

linkedReqTitle :: [Requirement] -> Maybe (Id Requirement) -> Text
linkedReqTitle _    Nothing    = "—"
linkedReqTitle reqs (Just rid) = maybe "(unknown)" (.title) (find (\r -> r.id == rid) reqs)

userName :: [User] -> Maybe UUID -> Text
userName _     Nothing    = "—"
userName users (Just uid) = maybe "(unknown)" (.name) (find (\u -> toUUID u.id == uid) users)

outcomeClass :: Text -> Text
outcomeClass "accepted"  = "bg-green-100 text-green-800"
outcomeClass "rejected"  = "bg-red-100 text-red-800"
outcomeClass "deferred"  = "bg-gray-100 text-gray-600"
outcomeClass "split"     = "bg-purple-100 text-purple-800"
outcomeClass "merged"    = "bg-indigo-100 text-indigo-800"
outcomeClass "reframed"  = "bg-orange-100 text-orange-800"
outcomeClass _           = "bg-gray-100 text-gray-600"

filterTabClass :: Maybe Text -> Maybe Text -> Text
filterTabClass a b
    | a == b    = "px-3 py-1.5 rounded bg-indigo-100 text-indigo-700 font-medium"
    | otherwise = "px-3 py-1.5 rounded text-gray-600 hover:bg-gray-100"