import { mmkvStorage } from '../services/mmkvStorage';
import { logger } from './logger';

const CATALOG_CUSTOM_NAMES_KEY = 'catalog_custom_names';

// Initialize cache as an empty object
let customNamesCache: { [key: string]: string } = {};
let cacheTimestamp: number = 0; // 0 indicates cache is invalid/empty initially
const CACHE_DURATION = 5 * 60 * 1000; // 5 minutes

async function loadCustomNamesIfNeeded(): Promise<{ [key: string]: string }> {
    const now = Date.now();
    // Check if cache is valid based on timestamp
    if (cacheTimestamp > 0 && (now - cacheTimestamp < CACHE_DURATION)) {
        return customNamesCache; // Cache is valid and guaranteed to be an object
    }

    try {
        logger.info('Loading custom catalog names from storage...');
        const savedCustomNamesJson = await mmkvStorage.getItem(CATALOG_CUSTOM_NAMES_KEY);
        // Assign parsed object or empty object if null/error
        customNamesCache = savedCustomNamesJson ? JSON.parse(savedCustomNamesJson) : {};
        cacheTimestamp = now; // Set timestamp only on successful load
        return customNamesCache;
    } catch (error) {
        logger.error('Failed to load custom catalog names in utility:', error);
        // Invalidate cache timestamp on error
        cacheTimestamp = 0;
        // Return the last known cache (which might be empty {}), or a fresh empty object
        return customNamesCache || {}; // Return cache (could be outdated but non-null) or empty {}
    }
}

export async function getCatalogDisplayName(addonId: string, type: string, catalogId: string, originalName: string): Promise<string> {
    // Ensure cache is loaded/refreshed before getting name
    const customNames = await loadCustomNamesIfNeeded(); 
    const key = `${addonId}:${type}:${catalogId}`;
    return customNames[key] || originalName;
}

// Function to clear the cache if settings are updated elsewhere
// Function to clear the cache if settings are updated elsewhere
export function clearCustomNameCache() {
    customNamesCache = {}; // Reset to empty object
    cacheTimestamp = 0; // Invalidate timestamp
    logger.info('Custom catalog name cache cleared.');
}

/**
 * Formats a catalog name by de-duplicating words, removing redundant English suffixes, 
 * and appending localized content type
 */
export function getFormattedCatalogName(
    originalName: string,
    type: string,
    localizedMovie: string,
    localizedSeries: string,
    localizedChannels?: string
): string {
    if (!originalName) return '';

    // 1. De-duplicate repeated words (case-insensitive)
    const words = originalName.split(' ').filter(Boolean);
    const uniqueWords: string[] = [];
    const seen = new Set<string>();
    for (const w of words) {
        const lw = w.toLowerCase();
        if (!seen.has(lw)) {
            uniqueWords.push(w);
            seen.add(lw);
        }
    }
    let processedName = uniqueWords.join(' ');

    // 2. Remove redundant English suffixes if they exist
    const redundantSuffixes = [' movies', ' movie', ' series', ' tv shows', ' tv show', ' shows', ' show', ' channels', ' channel'];
    const lowerName = processedName.toLowerCase();
    for (const suffix of redundantSuffixes) {
        if (lowerName.endsWith(suffix)) {
            processedName = processedName.substring(0, processedName.length - suffix.length).trim();
            break;
        }
    }

    // 3. Determine the localized content type suffix
    let contentType = '';
    if (type === 'movie') {
        contentType = localizedMovie;
    } else if (type === 'series' || type === 'tv') {
        contentType = localizedSeries;
    } else if (type === 'channel' && localizedChannels) {
        contentType = localizedChannels;
    }

    if (!contentType) return processedName;

    // 4. If the processed name already contains the localized content type, return it
    if (processedName.toLowerCase().includes(contentType.toLowerCase())) {
        return processedName;
    }

    return `${processedName} ${contentType}`;
}