98 lines
2.8 KiB
TypeScript
98 lines
2.8 KiB
TypeScript
export type WeightUnit = "kg" | "g" | "lb";
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const UNIT_FACTORS: Record<WeightUnit, number> = {
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kg: 1,
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g: 1000,
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lb: 2.20462262,
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};
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/**
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* 将内部统一保存的千克值转换为界面单位，并固定显示两位小数。
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*/
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export function formatWeight(valueKg: number, unit: WeightUnit) {
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const safeValue = Number.isFinite(valueKg) ? Math.max(0, valueKg) : 0;
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return (safeValue * UNIT_FACTORS[unit]).toFixed(2);
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}
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/**
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* 把 ISO 时间转换为终端文件名使用的本地时间格式：YYYYMMDDHHmmss。
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*/
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export function createFileTimestamp(iso: string) {
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const date = new Date(iso);
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const pad = (value: number) => value < 10 ? `0${value}` : String(value);
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return [
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date.getFullYear(),
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pad(date.getMonth() + 1),
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pad(date.getDate()),
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pad(date.getHours()),
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pad(date.getMinutes()),
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pad(date.getSeconds()),
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].join("");
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}
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/**
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* 兼容电子秤服务常见的消息格式：
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* - 纯数字，例如 `2.49`
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* - JSON，例如 `{"weight": 2490, "unit": "g"}`
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* - JSON 千克字段，例如 `{"weightKg": 2.49}`
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*
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* 返回值统一为千克；无效值、负数或不支持的单位返回 null。
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*/
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export function parseScaleMessage(message: string): number | null {
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const trimmed = message.trim();
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if (!trimmed) return null;
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let payload: unknown = trimmed;
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try {
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payload = JSON.parse(trimmed);
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} catch {
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// 非 JSON 消息继续按纯数字处理。
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}
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if (typeof payload === "number" || typeof payload === "string") {
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const value = Number(payload);
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return Number.isFinite(value) && value >= 0 ? value : null;
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}
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if (!payload || typeof payload !== "object") return null;
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const record = payload as Record<string, unknown>;
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const rawValue = record.weightKg ?? record.weight ?? record.value;
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const value = Number(rawValue);
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if (!Number.isFinite(value) || value < 0) return null;
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const unit = String(record.unit ?? (record.weightKg != null ? "kg" : "kg")).toLowerCase();
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if (unit === "kg") return value;
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if (unit === "g") return value / 1000;
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if (unit === "lb" || unit === "lbs") return value / UNIT_FACTORS.lb;
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return null;
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}
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export type StabilityResult = {
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stable: boolean;
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progress: number;
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};
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/**
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* 根据连续采样窗口判断重量是否稳定。
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* 至少需要 6 个有效样本，样本极差小于 8 克时判定稳定。
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*/
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export function evaluateStability(samples: number[]): StabilityResult {
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// 不使用 Array.prototype.at，确保兼容终端内置的 Chrome 52 WebView。
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const latest = samples.length ? samples[samples.length - 1] : 0;
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if (samples.length < 6 || latest < 0.01) {
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return {
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stable: false,
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progress: Math.min(85, samples.length * 14),
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};
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}
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const spread = Math.max(...samples) - Math.min(...samples);
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const stable = spread < 0.008;
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return {
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stable,
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progress: stable ? 100 : Math.max(25, 90 - spread * 500),
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};
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}
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