'use client';

export interface ExerciseLog {
  id: string;
  name: string;
  sets: number;
  reps: number;
  weight?: number;
}

export interface WorkoutSession {
  id: string;
  date: string;
  type: 'cardio' | 'training' | 'nutrition';
  distance?: number;
  duration: number;
  pace?: string;
  calories?: number;
  steps?: number;
  exercises?: ExerciseLog[];
  meals?: Array<{
    id: string;
    name: string;
    calories: number;
    protein: number;
    carbs: number;
    fats: number;
    timestamp: string;
  }>;
  notes?: string;
}

const STORAGE_KEY = 'workout_sessions';

export const workoutStorage = {
  getSessions: (): WorkoutSession[] => {
    if (typeof window === 'undefined') return [];
    const stored = localStorage.getItem(STORAGE_KEY);
    return stored ? JSON.parse(stored) : [];
  },

  addSession: (session: Omit<WorkoutSession, 'id'>): WorkoutSession => {
    const sessions = workoutStorage.getSessions();
    const newSession: WorkoutSession = {
      ...session,
      id: `session-${Date.now()}`,
    };
    sessions.push(newSession);
    if (typeof window !== 'undefined') {
      localStorage.setItem(STORAGE_KEY, JSON.stringify(sessions));
    }
    return newSession;
  },

  getSessionsByDate: (date: string): WorkoutSession[] => {
    const sessions = workoutStorage.getSessions();
    return sessions.filter((s) => s.date.startsWith(date));
  },

  getTodaysSessions: (): WorkoutSession[] => {
    const currentDate = new Date().toISOString().split('T')[0];
    return workoutStorage.getSessionsByDate(currentDate);
  },
};