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| 1 | +/* |
| 2 | + * Copyright 2026 znai maintainers |
| 3 | + * Copyright 2019 TWO SIGMA OPEN SOURCE, LLC |
| 4 | + * |
| 5 | + * Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | + * you may not use this file except in compliance with the License. |
| 7 | + * You may obtain a copy of the License at |
| 8 | + * |
| 9 | + * http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | + * |
| 11 | + * Unless required by applicable law or agreed to in writing, software |
| 12 | + * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | + * See the License for the specific language governing permissions and |
| 15 | + * limitations under the License. |
| 16 | + */ |
| 17 | + |
| 18 | +interface TabSwitchEvent { |
| 19 | + tabName: string; |
| 20 | + triggeredNode: HTMLElement | null; |
| 21 | +} |
| 22 | + |
| 23 | +type TabSwitchListener = (event: TabSwitchEvent) => void; |
| 24 | + |
| 25 | +const STORAGE_KEY = "znai-tabs-selection-history"; |
| 26 | +const MAX_HISTORY = 50; |
| 27 | + |
| 28 | +class TabsRegistration { |
| 29 | + private listeners: TabSwitchListener[] = []; |
| 30 | + private tabsSelectionHistory: string[] = loadHistory(); |
| 31 | + |
| 32 | + addTabSwitchListener(listener: TabSwitchListener) { |
| 33 | + this.listeners.push(listener); |
| 34 | + } |
| 35 | + |
| 36 | + removeTabSwitchListener(listener: TabSwitchListener) { |
| 37 | + removeFromArray(this.listeners, listener); |
| 38 | + } |
| 39 | + |
| 40 | + firstMatchFromHistory(names: string[]): string { |
| 41 | + return this.tabsSelectionHistory.find((n) => names.indexOf(n) >= 0) ?? names[0]; |
| 42 | + } |
| 43 | + |
| 44 | + notifyNewTab({ tabName, triggeredNode }: TabSwitchEvent) { |
| 45 | + removeFromArray(this.tabsSelectionHistory, tabName); |
| 46 | + this.tabsSelectionHistory.unshift(tabName); |
| 47 | + |
| 48 | + if (this.tabsSelectionHistory.length > MAX_HISTORY) { |
| 49 | + this.tabsSelectionHistory.length = MAX_HISTORY; |
| 50 | + } |
| 51 | + |
| 52 | + saveHistory(this.tabsSelectionHistory); |
| 53 | + |
| 54 | + this.listeners.forEach((l) => l({ tabName, triggeredNode })); |
| 55 | + } |
| 56 | +} |
| 57 | + |
| 58 | +function loadHistory(): string[] { |
| 59 | + try { |
| 60 | + const stored = localStorage.getItem(STORAGE_KEY); |
| 61 | + if (stored) { |
| 62 | + const parsed = JSON.parse(stored); |
| 63 | + if (Array.isArray(parsed)) { |
| 64 | + return parsed.filter((item: unknown) => typeof item === "string"); |
| 65 | + } |
| 66 | + } |
| 67 | + } catch (e) { |
| 68 | + console.warn("failed to load tabs selection history", e); |
| 69 | + } |
| 70 | + |
| 71 | + return []; |
| 72 | +} |
| 73 | + |
| 74 | +function saveHistory(history: string[]) { |
| 75 | + try { |
| 76 | + localStorage.setItem(STORAGE_KEY, JSON.stringify(history)); |
| 77 | + } catch (e) { |
| 78 | + console.warn("failed to save tabs selection history", e); |
| 79 | + } |
| 80 | +} |
| 81 | + |
| 82 | +function removeFromArray<T>(array: T[], value: T) { |
| 83 | + const idx = array.indexOf(value); |
| 84 | + if (idx !== -1) { |
| 85 | + array.splice(idx, 1); |
| 86 | + } |
| 87 | +} |
| 88 | + |
| 89 | +const tabsRegistration = new TabsRegistration(); |
| 90 | + |
| 91 | +export { tabsRegistration }; |
| 92 | +export type { TabSwitchEvent }; |
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