All files / src/tools calculate-volume.ts

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import type { SetLog, MovementPattern } from '@strengthsys/shared';
 
export interface VolumeResult {
  total_volume: number;
  per_movement_pattern: Partial<Record<MovementPattern, number>>;
}
 
/**
 * Calculate total training volume and breakdown per movement pattern.
 * Volume = weight_kg × reps for each completed set.
 * For exercises with multiple movement patterns, volume is split evenly.
 */
export function calculateVolume(sets: SetLog[]): VolumeResult {
  let total_volume = 0;
  const per_movement_pattern: Partial<Record<MovementPattern, number>> = {};
 
  for (const set of sets) {
    if (set.skipped) continue;
    if (set.actual_weight_kg == null || set.actual_reps == null) continue;
 
    const setVolume = set.actual_weight_kg * set.actual_reps;
    total_volume += setVolume;
 
    const patterns = set.movement_patterns;
    if (patterns.length > 0) {
      const share = setVolume / patterns.length;
      for (const pattern of patterns) {
        per_movement_pattern[pattern] = (per_movement_pattern[pattern] ?? 0) + share;
      }
    }
  }
 
  return { total_volume, per_movement_pattern };
}