1import { useState } from "preact/hooks";2import { settleUiMutation } from "@nzip/lofi";3import {4 type BootProgress,5 Notices,6 useBootProgress,7 usePendingWrites,8 useSyncStatus,9} from "@nzip/lofi/preact";10import {11 type Incident,12 type IncidentStatus,13 type Severity,14 useIncidents,15} from "./use-incidents.ts";1617// A cold first visit waits on the engine download, not on storage; name the18// wait it is actually in, with byte progress while the download runs.19function loadingLabel(boot: BootProgress): string {20 if (boot.phase !== "downloading") return "Opening persistent storage…";21 const mb = (bytes: number) => (bytes / (1024 * 1024)).toFixed(1);22 return boot.totalBytes === null23 ? `Downloading the app · ${mb(boot.loadedBytes)} MB…`24 : `Downloading the app · ${mb(boot.loadedBytes)} of ${mb(boot.totalBytes)} MB…`;25}2627const SEVERITIES: readonly Severity[] = ["smolder", "burn", "melt"];2829const COLUMNS: readonly { status: IncidentStatus; title: string }[] = [30 { status: "burning", title: "Burning" },31 { status: "contained", title: "Contained" },32 { status: "out", title: "Out" },33];3435const MOVES: Record<IncidentStatus, readonly { to: IncidentStatus; label: string }[]> = {36 burning: [{ to: "contained", label: "Contain" }, { to: "out", label: "Extinguish" }],37 contained: [{ to: "out", label: "Extinguish" }, { to: "burning", label: "Flare up" }],38 out: [{ to: "burning", label: "Reignite" }],39};4041function openedLabel(value: Incident["openedAt"]): string {42 const opened = value instanceof Date ? value : new Date(String(value));43 return opened.toLocaleTimeString([], { hour: "2-digit", minute: "2-digit" });44}4546/**47 * Author-owned demo UI: one island over one encrypted table, structured as a48 * three-state board. Reporting goes through a verb with effects; moving an49 * incident between states goes through a plain verb; every row carries its50 * real sync fate.51 */52export default function IncidentBoard() {53 const { status, error, durability, incidents, failureKind, report, setStatus } = useIncidents();54 const pending = usePendingWrites();55 const boot = useBootProgress();56 const [title, setTitle] = useState("");57 const [severity, setSeverity] = useState<Severity>("burn");5859 return (60 <section id="incidents" class="board" data-island="incidents">61 <form62 onSubmit={(event) => {63 event.preventDefault();64 const next = title.trim();65 if (!next) return;66 setTitle("");67 // The verb's handle is thenable: settled here at saved, while the68 // sync fate and its effects continue in the background.69 void settleUiMutation(report(next, severity));70 }}71 >72 <label for="new-incident">New incident</label>73 <div class="composer">74 <input75 id="new-incident"76 value={title}77 onInput={(event) => setTitle(event.currentTarget.value)}78 autocomplete="off"79 />80 <select81 name="severity"82 aria-label="Severity"83 value={severity}84 onChange={(event) => setSeverity(event.currentTarget.value as Severity)}85 >86 {SEVERITIES.map((option) => <option key={option} value={option}>{option}</option>)}87 </select>88 <button type="submit">Report</button>89 </div>90 </form>91 <p class="state" role="status">92 {status === "loading" && loadingLabel(boot)}93 {status === "error" &&94 `${failureKind === "read" ? "Read failed" : "Write failed"}: ${error}`}95 {status === "ready" && `${incidents.length} incident(s) · ${96 durability === "global"97 ? "confirmed by the store"98 : durability === "local"99 ? "saved on this device"100 : durability === "failed"101 ? "write declined"102 : "ready"103 }`}104 </p>105 {pending.count > 0 && (106 <p class="state" data-pending-writes={pending.count}>107 {pending.count} change{pending.count === 1 ? "" : "s"} waiting to sync108 </p>109 )}110 <Notices label="Incident notifications" />111 <div class="columns">112 {COLUMNS.map((column) => {113 const rows = incidents.filter((incident) => incident.status === column.status);114 return (115 <section key={column.status} class="column" data-status={column.status}>116 <h2>117 {column.title} <span class="count">{rows.length}</span>118 </h2>119 {rows.length === 0120 ? <p class="state column-empty">clear</p>121 : (122 <ul aria-label={column.title}>123 {rows.map((incident) => (124 <IncidentItem key={incident.id} incident={incident} setStatus={setStatus} />125 ))}126 </ul>127 )}128 </section>129 );130 })}131 </div>132 </section>133 );134}135136function IncidentItem(137 { incident, setStatus }: {138 incident: Incident;139 setStatus: (id: string, status: IncidentStatus) => PromiseLike<unknown>;140 },141) {142 const syncStatus = useSyncStatus(incident);143 return (144 <li class={`incident sev-${incident.severity}`}>145 <div class="incident-head">146 <span class="incident-title">{incident.title}</span>147 <span class="incident-meta">148 {incident.severity} · {openedLabel(incident.openedAt)}149 </span>150 </div>151 <div class="incident-actions">152 {MOVES[incident.status].map((move) => (153 <button154 key={move.to}155 type="button"156 class="move"157 onClick={() => void settleUiMutation(setStatus(incident.id, move.to))}158 >159 {move.label}160 </button>161 ))}162 {syncStatus !== "synced" && (163 <span class="state" data-sync-status={syncStatus}>164 {syncStatus === "waiting" ? "waiting to sync" : "declined"}165 </span>166 )}167 </div>168 </li>169 );170}