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import type { Activity, MetricACWRData } from '@/types';
/**
* Format date to YYYY-MM-DD in local timezone (not UTC)
*/
function formatDateLocal(date: Date): string {
const year = date.getFullYear();
const month = String(date.getMonth() + 1).padStart(2, '0');
const day = String(date.getDate()).padStart(2, '0');
return `${year}-${month}-${day}`;
}
/**
* Calculate ACWR for a specific metric (distance, duration, or TSS)
* @param activities - Array of activities
* @param metricExtractor - Function to extract the metric value from an activity
* @param dateRange - Optional date range to maintain consistency
*/
export function calculateMetricACWR(
activities: Activity[],
metricExtractor: (activity: Activity) => number | undefined,
dateRange?: { start: Date; end: Date }
): MetricACWRData {
if (activities.length === 0 && !dateRange) {
return {
dates: [],
values: [],
average7d: [],
average28d: [],
acwr: [],
};
}
// Sort activities by date
const sortedActivities = [...activities].sort((a, b) => a.date.getTime() - b.date.getTime());
// Get date range
const startDate = dateRange?.start || (sortedActivities.length > 0 ? new Date(sortedActivities[0].date) : new Date());
const endDate = dateRange?.end || (sortedActivities.length > 0 ? new Date(sortedActivities[sortedActivities.length - 1].date) : new Date());
// Create a map of date -> daily sum
const dailyValues = new Map<string, number>();
sortedActivities.forEach(activity => {
const dateStr = formatDateLocal(activity.date);
const value = metricExtractor(activity);
if (value !== undefined) {
dailyValues.set(dateStr, (dailyValues.get(dateStr) || 0) + value);
}
});
const dates: string[] = [];
const values: (number | null)[] = [];
const average7d: (number | null)[] = [];
const average28d: (number | null)[] = [];
const acwr: (number | null)[] = [];
// Generate all dates in range
const allDates: Date[] = [];
for (let d = new Date(startDate); d <= endDate; d.setDate(d.getDate() + 1)) {
allDates.push(new Date(d));
}
// Calculate for each date
allDates.forEach((date, index) => {
const dateStr = formatDateLocal(date);
dates.push(dateStr);
// Get daily value
const dailyValue = dailyValues.get(dateStr) || null;
values.push(dailyValue);
// Calculate 7-day rolling average (acute load)
let acuteSum = 0;
let acuteCount = 0;
for (let i = Math.max(0, index - 6); i <= index; i++) {
const checkDateStr = formatDateLocal(allDates[i]);
const val = dailyValues.get(checkDateStr);
if (val !== undefined) {
acuteSum += val;
acuteCount++;
}
}
const acuteAvg = acuteCount > 0 ? acuteSum / 7 : null;
average7d.push(acuteAvg);
// Calculate 28-day rolling average
let chronicSum = 0;
let chronicCount = 0;
for (let i = Math.max(0, index - 27); i <= index; i++) {
const checkDateStr = formatDateLocal(allDates[i]);
const val = dailyValues.get(checkDateStr);
if (val !== undefined) {
chronicSum += val;
chronicCount++;
}
}
const chronicAvg = chronicCount > 0 ? chronicSum / 28 : null;
average28d.push(chronicAvg);
// Calculate ACWR (need at least 28 days of data)
if (index < 27) {
acwr.push(null);
return;
}
// For ACWR, use the full 28-day sum (not average)
let acwrChronicSum = 0;
for (let i = index - 27; i <= index; i++) {
const checkDateStr = formatDateLocal(allDates[i]);
const val = dailyValues.get(checkDateStr);
if (val !== undefined) {
acwrChronicSum += val;
}
}
const acwrChronicAvg = acwrChronicSum / 28;
// Calculate ACWR
if (acwrChronicAvg > 0 && acuteAvg !== null) {
acwr.push(acuteAvg / acwrChronicAvg);
} else {
acwr.push(null);
}
});
return {
dates,
values,
average7d,
average28d,
acwr,
};
}
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