// app/modules/analytics/static/store/js/analytics.js
/**
 * Store analytics and reports page logic
 * View business metrics and performance data
 */

const storeAnalyticsLog = window.LogConfig.loggers.storeAnalytics ||
    window.LogConfig.createLogger('storeAnalytics', false);

storeAnalyticsLog.info('Loading...');

function storeAnalytics() {
    storeAnalyticsLog.info('storeAnalytics() called');

    return {
        // Inherit base layout state
        ...data(),

        // Set page identifier
        currentPage: 'analytics',

        // Loading states
        loading: true,
        error: '',

        // Time period
        period: '30d',
        periodOptions: [
            { value: '7d', label: 'Last 7 Days' },
            { value: '30d', label: 'Last 30 Days' },
            { value: '90d', label: 'Last 90 Days' },
            { value: '1y', label: 'Last Year' }
        ],

        // Analytics data
        analytics: null,
        stats: null,

        // Dashboard stats (from store stats endpoint)
        dashboardStats: {
            total_products: 0,
            active_products: 0,
            featured_products: 0,
            total_orders: 0,
            pending_orders: 0,
            total_customers: 0,
            total_inventory: 0,
            low_stock_count: 0
        },

        async init() {
            storeAnalyticsLog.info('Analytics init() called');

            // Guard against multiple initialization
            if (window._storeAnalyticsInitialized) {
                storeAnalyticsLog.warn('Already initialized, skipping');
                return;
            }
            window._storeAnalyticsInitialized = true;

            // IMPORTANT: Call parent init first to set storeCode from URL
            const parentInit = data().init;
            if (parentInit) {
                await parentInit.call(this);
            }

            try {
                await this.loadAllData();
            } catch (error) {
                storeAnalyticsLog.error('Init failed:', error);
                this.error = 'Failed to initialize analytics page';
            } finally {
                this.loading = false;
            }

            storeAnalyticsLog.info('Analytics initialization complete');
        },

        /**
         * Load all analytics data
         */
        async loadAllData() {
            this.loading = true;
            this.error = '';

            try {
                // Load analytics and stats in parallel
                const [analyticsResponse, statsResponse] = await Promise.all([
                    this.fetchAnalytics(),
                    this.fetchStats()
                ]);

                this.analytics = analyticsResponse;
                this.dashboardStats = statsResponse;

                storeAnalyticsLog.info('Loaded analytics data');
            } catch (error) {
                storeAnalyticsLog.error('Failed to load data:', error);
                this.error = error.message || 'Failed to load analytics data';
            } finally {
                this.loading = false;
            }
        },

        /**
         * Fetch analytics data for current period
         */
        async fetchAnalytics() {
            try {
                const response = await apiClient.get(`/store/analytics?period=${this.period}`);
                return response;
            } catch (error) {
                // Analytics might require feature access
                if (error.status === 403) {
                    storeAnalyticsLog.warn('Analytics feature not available');
                    return null;
                }
                throw error;
            }
        },

        /**
         * Fetch dashboard stats
         */
        async fetchStats() {
            try {
                const response = await apiClient.get(`/store/dashboard/stats`);
                return {
                    total_products: response.catalog?.total_products || 0,
                    active_products: response.catalog?.active_products || 0,
                    featured_products: response.catalog?.featured_products || 0,
                    total_orders: response.orders?.total || 0,
                    pending_orders: response.orders?.pending || 0,
                    total_customers: response.customers?.total || 0,
                    total_inventory: response.inventory?.total_quantity || 0,
                    low_stock_count: response.inventory?.low_stock_count || 0
                };
            } catch (error) {
                storeAnalyticsLog.error('Failed to fetch stats:', error);
                return this.dashboardStats;
            }
        },

        /**
         * Change time period and reload data
         */
        async changePeriod(newPeriod) {
            this.period = newPeriod;
            try {
                await this.loadAllData();
            } catch (error) {
                storeAnalyticsLog.error('Failed to change period:', error);
            }
        },

        /**
         * Get period label
         */
        getPeriodLabel() {
            const option = this.periodOptions.find(p => p.value === this.period);
            return option ? option.label : this.period;
        },

        /**
         * Format number with commas
         */
        formatNumber(num) {
            if (num === null || num === undefined) return '0';
            const locale = window.STORE_CONFIG?.locale || 'en-GB';
            return num.toLocaleString(locale);
        },

        /**
         * Format percentage
         */
        formatPercent(value) {
            if (value === null || value === undefined) return '0%';
            return `${value.toFixed(1)}%`;
        },

        /**
         * Calculate active product percentage
         */
        get activeProductPercent() {
            if (!this.dashboardStats.total_products) return 0;
            return (this.dashboardStats.active_products / this.dashboardStats.total_products * 100).toFixed(1);
        },

        /**
         * Calculate pending order percentage
         */
        get pendingOrderPercent() {
            if (!this.dashboardStats.total_orders) return 0;
            return (this.dashboardStats.pending_orders / this.dashboardStats.total_orders * 100).toFixed(1);
        },

        /**
         * Get stock health status
         */
        get stockHealth() {
            if (this.dashboardStats.low_stock_count === 0) {
                return { status: 'good', label: 'Healthy', color: 'green' };
            } else if (this.dashboardStats.low_stock_count <= 5) {
                return { status: 'warning', label: 'Attention Needed', color: 'yellow' };
            } else {
                return { status: 'critical', label: 'Critical', color: 'red' };
            }
        }
    };
}