/** 左栏宽度占「主区宽度 − resizer(8px)」的比例，与 LayoutController / chatPanelLayout 内逻辑一致 */

const DEFAULT_RATIO = 0.5;
const MIN_RATIO = 0.1;
const MAX_RATIO = 0.9;

export const PANEL_SPLIT_STORAGE_KEY_START = 'info_radar_panel_split_start';
export const PANEL_SPLIT_STORAGE_KEY_CHAT = 'info_radar_panel_split_chat';
export const PANEL_SPLIT_STORAGE_KEY_ATTRIBUTION = 'info_radar_panel_split_attribution';
export const PANEL_SPLIT_STORAGE_KEY_GEN_ATTRIBUTE = 'info_radar_panel_split_gen_attribute';

export function readPanelSplitRatio(storageKey: string): number {
    try {
        const raw = localStorage.getItem(storageKey);
        if (raw === null) {
            return DEFAULT_RATIO;
        }
        const n = Number(raw);
        if (!Number.isFinite(n)) {
            return DEFAULT_RATIO;
        }
        return Math.max(MIN_RATIO, Math.min(MAX_RATIO, n));
    } catch {
        return DEFAULT_RATIO;
    }
}

export function writePanelSplitRatio(storageKey: string, ratio: number): void {
    try {
        const clamped = Math.max(MIN_RATIO, Math.min(MAX_RATIO, ratio));
        localStorage.setItem(storageKey, String(clamped));
    } catch {
        // ignore quota / private mode
    }
}