// static/shared/js/feature-store.js
/**
 * Feature Store for Alpine.js
 *
 * Provides feature availability checking for tier-based access control.
 * Loads features from the API on init and caches them for the session.
 *
 * Usage in templates:
 *
 * 1. Check if feature is available:
 *    <div x-show="$store.features.has('analytics_dashboard')">
 *        Analytics content here
 *    </div>
 *
 * 2. Show upgrade prompt if not available:
 *    <div x-show="!$store.features.has('analytics_dashboard')">
 *        <p>Upgrade to access Analytics</p>
 *    </div>
 *
 * 3. Conditionally render with x-if:
 *    <template x-if="$store.features.has('api_access')">
 *        <a href="/settings/api">API Settings</a>
 *    </template>
 *
 * 4. Use feature data for upgrade prompts:
 *    <p x-text="$store.features.getUpgradeTier('analytics_dashboard')"></p>
 *
 * 5. Get current tier info:
 *    <span x-text="$store.features.tierName"></span>
 */

(function () {
    'use strict';

    // Use centralized logger if available
    const log = window.LogConfig?.log || console;

    /**
     * Feature Store
     */
    const featureStore = {
        // State
        features: [],           // Array of feature codes available to vendor
        featuresMap: {},        // Full feature info keyed by code
        tierCode: null,         // Current tier code
        tierName: null,         // Current tier name
        loading: true,          // Loading state
        loaded: false,          // Whether features have been loaded
        error: null,            // Error message if load failed

        /**
         * Initialize the feature store
         * Called automatically when Alpine starts
         */
        async init() {
            // Guard against multiple initialization
            if (window._featureStoreInitialized) return;
            window._featureStoreInitialized = true;

            try {
                log.debug('[FeatureStore] Initializing...');
                await this.loadFeatures();
            } catch (error) {
                log.error('[FeatureStore] Failed to initialize:', error);
            }
        },

        /**
         * Load features from API
         */
        async loadFeatures() {
            // Don't reload if already loaded
            if (this.loaded) {
                log.debug('[FeatureStore] Already loaded, skipping');
                return;
            }

            // Get vendor code from URL
            const vendorCode = this.getVendorCode();
            if (!vendorCode) {
                log.warn('[FeatureStore] No vendor code found in URL');
                this.loading = false;
                return;
            }

            try {
                this.loading = true;
                this.error = null;

                // Fetch available features (lightweight endpoint)
                const response = await apiClient.get('/vendor/features/available');

                this.features = response.features || [];
                this.tierCode = response.tier_code;
                this.tierName = response.tier_name;
                this.loaded = true;

                log.debug(`[FeatureStore] Loaded ${this.features.length} features for ${this.tierName} tier`);

            } catch (error) {
                log.error('[FeatureStore] Failed to load features:', error);
                this.error = error.message || 'Failed to load features';
                // Set empty array so checks don't fail
                this.features = [];
            } finally {
                this.loading = false;
            }
        },

        /**
         * Load full feature details (with metadata)
         * Use this when you need upgrade info
         */
        async loadFullFeatures() {
            const vendorCode = this.getVendorCode();
            if (!vendorCode) return;

            try {
                const response = await apiClient.get('/vendor/features');

                // Build map for quick lookup
                this.featuresMap = {};
                for (const feature of response.features) {
                    this.featuresMap[feature.code] = feature;
                }

                log.debug(`[FeatureStore] Loaded full details for ${response.features.length} features`);

            } catch (error) {
                log.error('[FeatureStore] Failed to load full features:', error);
            }
        },

        /**
         * Check if vendor has access to a feature
         * @param {string} featureCode - The feature code to check
         * @returns {boolean} - Whether the feature is available
         */
        has(featureCode) {
            return this.features.includes(featureCode);
        },

        /**
         * Check if vendor has access to ANY of the given features
         * @param {...string} featureCodes - Feature codes to check
         * @returns {boolean} - Whether any feature is available
         */
        hasAny(...featureCodes) {
            return featureCodes.some(code => this.has(code));
        },

        /**
         * Check if vendor has access to ALL of the given features
         * @param {...string} featureCodes - Feature codes to check
         * @returns {boolean} - Whether all features are available
         */
        hasAll(...featureCodes) {
            return featureCodes.every(code => this.has(code));
        },

        /**
         * Get feature info (requires loadFullFeatures first)
         * @param {string} featureCode - The feature code
         * @returns {object|null} - Feature info or null
         */
        getFeature(featureCode) {
            return this.featuresMap[featureCode] || null;
        },

        /**
         * Get the tier name required for a feature
         * @param {string} featureCode - The feature code
         * @returns {string|null} - Tier name or null
         */
        getUpgradeTier(featureCode) {
            const feature = this.getFeature(featureCode);
            return feature?.minimum_tier_name || null;
        },

        /**
         * Get vendor code from URL
         * @returns {string|null}
         */
        getVendorCode() {
            const path = window.location.pathname;
            const segments = path.split('/').filter(Boolean);
            if (segments[0] === 'vendor' && segments[1]) {
                return segments[1];
            }
            return null;
        },

        /**
         * Reload features (e.g., after tier change)
         */
        async reload() {
            try {
                this.loaded = false;
                this.features = [];
                this.featuresMap = {};
                await this.loadFeatures();
            } catch (error) {
                log.error('[FeatureStore] Failed to reload:', error);
            }
        }
    };

    // Register Alpine store when Alpine is available
    document.addEventListener('alpine:init', () => {
        Alpine.store('features', featureStore);
        log.debug('[FeatureStore] Registered as Alpine store');
    });

    // Also expose globally for non-Alpine usage
    window.FeatureStore = featureStore;

})();