/**
 * state.js - Centralized state management for the dashboard
 * 
 * This module maintains the application state and provides getters/setters
 * to allow other modules to interact with the state in a controlled manner.
 */

import { formatDateForAPI } from './dateUtils.js'; // Import from dateUtils

// State container - private to this module
const state = {
    // Current view/period
    currentPeriod: 'daily', // 'daily', 'weekly', 'monthly'
    selectedDate: formatDateForAPI(new Date()), // Current date in YYYY-MM-DD format
    currentDate: new Date(), // Date object for the selected date
    selectedWeekDay: null, // Selected day within weekly view
    
    // Table data and filtering
    reportData: [], // Currently displayed report data
    currentStateFilter: 'all', // 'all', 'working', 'not_working'
    userFilterText: '', // Text entered in the user filter input
    
    // Sorting
    currentSortColumn: 'duration', // Which column is being sorted - default to duration (real work hours)
    currentSortDirection: 'desc', // 'asc' or 'desc' - default to descending
    
    // User states
    userStates: {}, // Cache of user states {username: state}
    userStatesLastUpdate: 0, // Timestamp of last update
    STATE_CACHE_DURATION: 5000, // 5 seconds
    
    // Auto-refresh
    autoRefreshEnabled: true, // Auto-refresh enabled by default
    autoRefreshInterval: 60000, // Default refresh interval (60 seconds). Aligns with client-side 1-minute reporting.
    autoRefreshTimer: null, // Holds the timer reference
    lastRefreshTime: Date.now(), // Last time data was refreshed
    countdownTimer: null, // Timer for updating countdown display
};

// Exported getters and setters
export default {
    // Period/view getters and setters
    getCurrentPeriod: () => state.currentPeriod,
    setCurrentPeriod: (period) => {
        state.currentPeriod = period;
        return state.currentPeriod;
    },
    
    getSelectedDate: () => state.selectedDate,
    setSelectedDate: (dateStr) => {
        state.selectedDate = dateStr;
        // Parse YYYY-MM-DD as local date to avoid timezone interpretation issues
        if (dateStr && typeof dateStr === 'string' && dateStr.includes('-')) {
            const parts = dateStr.split('-');
            if (parts.length === 3) {
                const year = parseInt(parts[0], 10);
                const month = parseInt(parts[1], 10) - 1; // JavaScript months are 0-indexed
                const day = parseInt(parts[2], 10);
                // Check if parts are valid numbers before creating date
                if (!isNaN(year) && !isNaN(month) && !isNaN(day)) {
                    state.currentDate = new Date(year, month, day);
                } else {
                    console.warn(`Invalid date parts in setSelectedDate: ${dateStr}`);
                    state.currentDate = new Date(); // Fallback or handle error appropriately
                }
            } else {
                console.warn(`Invalid date string format in setSelectedDate: ${dateStr}`);
                state.currentDate = new Date(); // Fallback
            }
        } else {
            console.warn(`Invalid dateStr input to setSelectedDate: ${dateStr}`);
            state.currentDate = new Date(); // Fallback for null or non-string input
        }
        return state.selectedDate;
    },
    
    getCurrentDate: () => state.currentDate,
    setCurrentDate: (date) => {
        state.currentDate = date;
        state.selectedDate = formatDateForAPI(date);
        return state.currentDate;
    },
    
    getSelectedWeekDay: () => state.selectedWeekDay,
    setSelectedWeekDay: (day) => {
        state.selectedWeekDay = day;
        return state.selectedWeekDay;
    },
    
    // Report data getters and setters
    getReportData: () => state.reportData,
    setReportData: (data) => {
        state.reportData = [...data];
        return state.reportData;
    },
    
    // Filter getters and setters
    getCurrentStateFilter: () => state.currentStateFilter,
    setCurrentStateFilter: (filter) => {
        state.currentStateFilter = filter;
        return state.currentStateFilter;
    },
    
    getUserFilterText: () => state.userFilterText,
    setUserFilterText: (text) => {
        state.userFilterText = text;
        return state.userFilterText;
    },
    
    // Sort getters and setters
    getCurrentSortColumn: () => state.currentSortColumn,
    setCurrentSortColumn: (column) => {
        state.currentSortColumn = column;
        return state.currentSortColumn;
    },
    
    getCurrentSortDirection: () => state.currentSortDirection,
    setCurrentSortDirection: (direction) => {
        state.currentSortDirection = direction;
        return state.currentSortDirection;
    },
    
    // User states getters and setters
    getUserStates: () => state.userStates,
    setUserStates: (states) => {
        state.userStates = {...states};
        state.userStatesLastUpdate = Date.now();
        return state.userStates;
    },
    
    getUserStatesLastUpdate: () => state.userStatesLastUpdate,
    getStateCacheDuration: () => state.STATE_CACHE_DURATION,
    
    // Auto-refresh getters and setters
    isAutoRefreshEnabled: () => state.autoRefreshEnabled,
    setAutoRefreshEnabled: (enabled) => {
        state.autoRefreshEnabled = enabled;
        return state.autoRefreshEnabled;
    },
    
    getAutoRefreshInterval: () => state.autoRefreshInterval,
    setAutoRefreshInterval: (interval) => {
        state.autoRefreshInterval = interval;
        return state.autoRefreshInterval;
    },
    
    getAutoRefreshTimer: () => state.autoRefreshTimer,
    setAutoRefreshTimer: (timer) => {
        state.autoRefreshTimer = timer;
        return state.autoRefreshTimer;
    },
    
    getLastRefreshTime: () => state.lastRefreshTime,
    setLastRefreshTime: (time) => {
        state.lastRefreshTime = time;
        return state.lastRefreshTime;
    },
    
    getCountdownTimer: () => state.countdownTimer,
    setCountdownTimer: (timer) => {
        state.countdownTimer = timer;
        return state.countdownTimer;
    }
};