const STORAGE_KEY = 'gym_tracker_v5';

export const state = {
    workouts: [],
    exerciseRef: [],
    bodyMetrics: [],
    expandedWorkoutId: null,
    expandedExerciseId: null,
    nextId: 1,
};

export function loadState() {
    const saved = localStorage.getItem(STORAGE_KEY);
    if (saved) {
        try {
            const parsed = JSON.parse(saved);
            Object.assign(state, parsed);
            if (!state.exerciseRef) state.exerciseRef = [];
            if (!state.bodyMetrics) state.bodyMetrics = [];
        } catch (e) {
            console.error('Failed to load state', e);
        }
    }
}

export function saveState() {
    localStorage.setItem(STORAGE_KEY, JSON.stringify(state));
    updateSyncStatus();
}

export function genId() {
    return (state.nextId++).toString();
}

export function updateSyncStatus() {
    const dirty = state.workouts.filter(w => !w.synced);
    const el = document.getElementById('sync-status');
    if (!el) return;
    if (dirty.length === 0) {
        el.textContent = '● Всё синхронизировано';
        el.className = 'sync-status synced';
    } else {
        el.textContent = `● ${dirty.length} не сохран.`;
        el.className = 'sync-status pending';
    }
}