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 aria-label="Severity"82 value={severity}83 onChange={(event) => setSeverity(event.currentTarget.value as Severity)}84 >85 {SEVERITIES.map((option) => <option key={option} value={option}>{option}</option>)}86 </select>87 <button type="submit">Report</button>88 </div>89 </form>90 <p class="state" role="status">91 {status === "loading" && loadingLabel(boot)}92 {status === "error" &&93 `${failureKind === "read" ? "Read failed" : "Write failed"}: ${error}`}94 {status === "ready" && `${incidents.length} incident(s) · ${95 durability === "global"96 ? "confirmed by the store"97 : durability === "local"98 ? "saved on this device"99 : durability === "failed"100 ? "write declined"101 : "ready"102 }`}103 </p>104 {pending.count > 0 && (105 <p class="state" data-pending-writes={pending.count}>106 {pending.count} change{pending.count === 1 ? "" : "s"} waiting to sync107 </p>108 )}109 <Notices label="Incident notifications" />110 <div class="columns">111 {COLUMNS.map((column) => {112 const rows = incidents.filter((incident) => incident.status === column.status);113 return (114 <section key={column.status} class="column" data-status={column.status}>115 <h2>116 {column.title} <span class="count">{rows.length}</span>117 </h2>118 {rows.length === 0119 ? <p class="state column-empty">clear</p>120 : (121 <ul aria-label={column.title}>122 {rows.map((incident) => (123 <IncidentItem key={incident.id} incident={incident} setStatus={setStatus} />124 ))}125 </ul>126 )}127 </section>128 );129 })}130 </div>131 </section>132 );133}134135function IncidentItem(136 { incident, setStatus }: {137 incident: Incident;138 setStatus: (id: string, status: IncidentStatus) => PromiseLike<unknown>;139 },140) {141 const syncStatus = useSyncStatus(incident);142 return (143 <li class={`incident sev-${incident.severity}`}>144 <div class="incident-head">145 <span class="incident-title">{incident.title}</span>146 <span class="incident-meta">147 {incident.severity} · {openedLabel(incident.openedAt)}148 </span>149 </div>150 <div class="incident-actions">151 {MOVES[incident.status].map((move) => (152 <button153 key={move.to}154 type="button"155 class="move"156 onClick={() => void settleUiMutation(setStatus(incident.id, move.to))}157 >158 {move.label}159 </button>160 ))}161 {syncStatus !== "synced" && (162 <span class="state" data-sync-status={syncStatus}>163 {syncStatus === "waiting" ? "waiting to sync" : "declined"}164 </span>165 )}166 </div>167 </li>168 );169}