const mongoose = require('mongoose');

/**
 * نموذج معرض القوالب - يدعم القوالب الجاهزة للتحميل والتثبيت بنقرة واحدة
 * @version 2.0.0 - متوافق مع نظام التطبيق الكامل للقوالب
 */

const templateReviewSchema = new mongoose.Schema({
    userId: { type: mongoose.Schema.Types.ObjectId, ref: 'User', required: true },
    rating: { type: Number, required: true, min: 1, max: 5 },
    comment: { type: String, maxlength: 500 },
    createdAt: { type: Date, default: Date.now }
});

const templateVersionSchema = new mongoose.Schema({
    version: { type: String, required: true, match: /^\d+\.\d+\.\d+$/ },
    changelog: { type: String },
    zipUrl: { type: String },
    releasedAt: { type: Date, default: Date.now }
});

const templateSchema = new mongoose.Schema({
    // ============================================
    // المعلومات الأساسية
    // ============================================
    name: { 
        type: String, 
        required: true, 
        trim: true,
        maxlength: 100,
        index: true
    },
    slug: {
        type: String,
        required: true,
        unique: true,
        lowercase: true,
        trim: true,
        match: /^[a-z0-9]+(?:-[a-z0-9]+)*$/
    },
    description: { 
        type: String, 
        required: true,
        maxlength: 500
    },
    
    // ============================================
    // التصنيفات
    // ============================================
    category: { 
        type: String, 
        enum: ['fashion', 'electronics', 'food', 'art', 'beauty', 'sports', 'education', 'business', 'portfolio', 'blog', 'minimal', 'modern', 'dark', 'light'],
        default: 'general',
        index: true
    },
    tags: [{ 
        type: String, 
        trim: true,
        lowercase: true,
        index: true
    }],
    
    // ============================================
    // الصور والمعاينة
    // ============================================
    previewImage: { 
        type: String, 
        required: true 
    },
    previewImages: [{
        type: String,
        description: { type: String }
    }],
    previewVideo: { type: String },
    demoUrl: { type: String },
    thumbnail: { type: String },
    
    // ============================================
    // ملفات القالب
    // ============================================
    themeZipUrl: { 
        type: String, 
        required: true 
    },
    themeZipSize: { type: Number },
    themeZipHash: { type: String },
    
    // ============================================
    // 🎨 بيانات القالب الكاملة (محدثة)
    // ============================================
    themeData: {
        // 🎨 الألوان
        colors: {
            primary: { type: String, default: '#3b82f6' },
            secondary: { type: String, default: '#8b5cf6' },
            accent: { type: String, default: '#f59e0b' },
            background: { type: String, default: '#ffffff' },
            text: { type: String, default: '#1f2937' },
            textLight: { type: String, default: '#6b7280' },
            border: { type: String, default: '#e5e7eb' },
            success: { type: String, default: '#10b981' },
            error: { type: String, default: '#ef4444' },
            warning: { type: String, default: '#f59e0b' }
        },
        
        // 🎨 الخطوط
        typography: {
            fontFamily: { type: String, default: 'Inter, sans-serif' },
            headingFont: { type: String, default: 'Inter, sans-serif' },
            baseFontSize: { type: String, default: '16px' },
            enableGoogleFonts: { type: Boolean, default: true }
        },
        
        // 🎨 التخطيط
        layout: {
            type: { type: String, enum: ['full-width', 'boxed', 'fluid'], default: 'full-width' },
            headerLayout: { type: String, enum: ['default', 'centered', 'minimal', 'transparent'], default: 'default' },
            footerLayout: { type: String, enum: ['default', 'minimal', 'columns'], default: 'default' },
            sidebarPosition: { type: String, enum: ['left', 'right', 'none'], default: 'none' },
            columns: { type: Number, default: 4, min: 2, max: 6 },
            stickyHeader: { type: Boolean, default: false },
            containerWidth: { type: String, default: '1280px' },
            containerPadding: { type: String, default: '20px' },
            showBreadcrumb: { type: Boolean, default: true },
            backToTop: { type: Boolean, default: true },
            showSearchBar: { type: Boolean, default: true },
            showCategories: { type: Boolean, default: true },
            productsPerRowMobile: { type: Number, default: 2 },
            productsPerRowTablet: { type: Number, default: 3 },
            enableStickyAddToCart: { type: Boolean, default: true },
            enableCompareProducts: { type: Boolean, default: false },
            enableWishlist: { type: Boolean, default: false },
            enableRecentlyViewed: { type: Boolean, default: true }
        },
        
        // 🎨 تأثيرات إضافية
        borderRadius: { type: Number, default: 16, min: 0, max: 48 },
        shadowType: { type: String, enum: ['none', 'sm', 'md', 'lg', 'xl'], default: 'md' },
        animationType: { type: String, enum: ['none', 'lift', 'scale', 'glow'], default: 'lift' },
        glassEffect: { type: Boolean, default: false },
        
        // 🎨 الخلفية
        backgroundType: { 
            type: String, 
            enum: ['default', 'dots', 'grid', 'cross', 'gradient', 'image'], 
            default: 'default' 
        },
        backgroundValue: { type: String, default: '' },
        
        // 🎨 CSS/JS مخصص
        customCss: { type: String, default: '' },
        customJs: { type: String, default: '' },
        
        // 📄 الأقسام
        sections: { type: mongoose.Schema.Types.Mixed, default: [] },
        
        // 🏪 معلومات المتجر الأساسية
        storeInfo: {
            storeName: { type: String, default: '' },
            storeLogo: { type: String, default: '' },
            storeBanner: { type: String, default: '' },
            storeDescription: { type: String, default: '' },
            contactEmail: { type: String, default: '' }
        },
        
        // 📄 الصفحات
        pages: [{
            slug: { type: String, required: true },
            title: { type: String, required: true },
            content: { type: String, default: '' },
            css: { type: String, default: '' },
            js: { type: String, default: '' },
            seo: {
                title: { type: String },
                description: { type: String },
                keywords: { type: String },
                ogImage: { type: String }
            },
            isEnabled: { type: Boolean, default: true },
            order: { type: Number, default: 0 },
            type: { type: String, default: 'custom' }
        }],
        
        // 📄 الصفحات الافتراضية
        defaultPages: {
            about: {
                title: { type: String, default: 'About Us' },
                content: { type: String, default: '' },
                seo: { type: mongoose.Schema.Types.Mixed, default: {} }
            },
            contact: {
                title: { type: String, default: 'Contact Us' },
                content: { type: String, default: '' },
                seo: { type: mongoose.Schema.Types.Mixed, default: {} }
            }
        },
        
        // 🔗 روابط التواصل الاجتماعي
        socialLinks: {
            instagram: { type: String, default: '' },
            facebook: { type: String, default: '' },
            twitter: { type: String, default: '' },
            tiktok: { type: String, default: '' },
            linkedin: { type: String, default: '' },
            youtube: { type: String, default: '' },
            whatsapp: { type: String, default: '' },
            telegram: { type: String, default: '' }
        },
        
        // 💰 إعدادات الدفع
        paymentSettings: {
            enableCOD: { type: Boolean, default: false },
            enableInstallments: { type: Boolean, default: false },
            minOrderAmount: { type: Number, default: 0 },
            freeShippingThreshold: { type: Number, default: 0 },
            taxRate: { type: Number, default: 0, min: 0, max: 100 },
            shippingCost: { type: Number, default: 0 }
        },
        
        // 🎯 إعدادات المنتجات
        productsSettings: {
            productViewType: { type: String, enum: ['modal', 'page'], default: 'modal' },
            productsPerRow: { type: Number, default: 4, min: 2, max: 6 },
            enableQuickView: { type: Boolean, default: true },
            enableProductReviews: { type: Boolean, default: true },
            autoApproveReviews: { type: Boolean, default: false }
        },
        
        // 🎨 الهيدر والفوتر المخصص
        customHeaderFooter: {
            header: { type: String, default: '' },
            footer: { type: String, default: '' },
            sidebar: { type: String, default: '' },
            productCard: { type: String, default: '' },
            categoryCard: { type: String, default: '' },
            css: { type: String, default: '' },
            js: { type: String, default: '' }
        },
        
        templateUrl: { type: String, default: null },
        uploadedFiles: {
        type: mongoose.Schema.Types.Mixed,
        default: null
        },
        hasIndexHtml: { type: Boolean, default: false },

        // 💱 العملة
        currency: { type: String, default: 'USD', uppercase: true },
        
        // 📑 ترتيب الصفحات
        pagesOrder: {
            type: mongoose.Schema.Types.Mixed,
            default: { products: 1, about: 2, contact: 3 }
        },
        
        // 🏷️ أكواد الخصم
        storeCoupons: [{
            code: { type: String, uppercase: true },
            discount: { type: Number, min: 0, max: 100 },
            discountType: { type: String, enum: ['percentage', 'fixed'], default: 'percentage' },
            minPurchase: { type: Number, default: 0 },
            maxDiscount: { type: Number },
            validUntil: { type: Date },
            isActive: { type: Boolean, default: true }
        }],
        
        // 📦 مناطق الشحن
        shippingZones: [{
            name: { type: String },
            countries: [{ type: String }],
            cost: { type: Number, default: 0 },
            freeShippingAbove: { type: Number, default: 0 },
            estimatedDays: { type: String, default: '3-7 business days' }
        }],
        
        // 🔍 إعدادات SEO
        seoSettings: {
            metaTitleTemplate: { type: String, default: '{{title}} | {{storeName}}' },
            metaDescriptionTemplate: { type: String, default: '' },
            enableBreadcrumbs: { type: Boolean, default: true },
            sitemapEnabled: { type: Boolean, default: true }
        },
        
        // ⚡ إعدادات الأداء
        performanceSettings: {
            enableLazyLoad: { type: Boolean, default: true },
            enableImageOptimization: { type: Boolean, default: true },
            enablePreload: { type: Boolean, default: true },
            cacheTTL: { type: Number, default: 3600 }
        },
        
        // 🎨 معلومات إضافية عن القالب
        templateMeta: {
            minVersion: { type: String, default: '1.0.0' },
            maxVersion: { type: String, default: '3.0.0' },
            requires: [{ type: String }],
            screenshots: [{ type: String }],
            demoUrl: { type: String },
            documentationUrl: { type: String },
            supportUrl: { type: String }
        }
    },
    
    // ============================================
    // متطلبات التثبيت
    // ============================================
    requiredSubscription: {
        type: String,
        enum: ['free', 'basic', 'pro', 'business', 'enterprise'],
        default: 'free',
        index: true
    },
    requiredPermissions: [{
        type: String,
        enum: ['store_enabled', 'custom_domain', 'analytics']
    }],
    
    // ============================================
    // إحصائيات
    // ============================================
    downloadsCount: { 
        type: Number, 
        default: 0,
        index: true
    },
    viewsCount: { 
        type: Number, 
        default: 0 
    },
    rating: { 
        type: Number, 
        default: 0, 
        min: 0, 
        max: 5 
    },
    ratingCount: { 
        type: Number, 
        default: 0 
    },
    reviews: [templateReviewSchema],
    
    // ============================================
    // الإصدارات
    // ============================================
    version: { 
        type: String, 
        default: '1.0.0',
        match: /^\d+\.\d+\.\d+$/
    },
    versions: [templateVersionSchema],
    
    // ============================================
    // حالة القالب
    // ============================================
    isActive: { 
        type: Boolean, 
        default: true,
        index: true
    },
    isFeatured: { 
        type: Boolean, 
        default: false,
        index: true
    },
    isVerified: { 
        type: Boolean, 
        default: false,
        index: true
    },
    
    // ============================================
    // معلومات الناشر
    // ============================================
    authorId: { 
        type: mongoose.Schema.Types.ObjectId, 
        ref: 'User',
        index: true
    },
    authorName: { type: String },
    authorEmail: { type: String },
    authorWebsite: { type: String },
    
    // ============================================
    // إعدادات إضافية
    // ============================================
    settings: {
        requiresSetup: { type: Boolean, default: false },
        setupInstructions: { type: String },
        compatibleWith: [{
            platformVersion: { type: String },
            minVersion: { type: String }
        }],
        dependencies: [{ type: String }]
    },
    
    // ============================================
    // سجل التثبيت
    // ============================================
    installedBy: [{
        userId: { type: mongoose.Schema.Types.ObjectId, ref: 'User' },
        installedAt: { type: Date, default: Date.now },
        storeId: { type: mongoose.Schema.Types.ObjectId, ref: 'User' },
        appliedSettings: { type: mongoose.Schema.Types.Mixed } // تخزين الإعدادات التي تم تطبيقها
    }],
    
    createdAt: { type: Date, default: Date.now, immutable: true },
    updatedAt: { type: Date, default: Date.now }
}, {
    timestamps: true,
    toJSON: { virtuals: true },
    toObject: { virtuals: true }
});

// ============================================
// ✅ Indexes محسنة للبحث
// ============================================
templateSchema.index({ category: 1, isActive: 1, isFeatured: -1 });
templateSchema.index({ downloadsCount: -1, rating: -1 });
templateSchema.index({ tags: 1 });
templateSchema.index({ name: 'text', description: 'text', tags: 'text' });
templateSchema.index({ requiredSubscription: 1 });
templateSchema.index({ 'installedBy.userId': 1 });
templateSchema.index({ 'themeData.currency': 1 });
templateSchema.index({ 'themeData.layout.type': 1 });
templateSchema.index({ version: -1 });

// ============================================
// ✅ Virtuals
// ============================================
templateSchema.virtual('downloadUrl').get(function() {
    return `/api/templates/${this.slug}/download`;
});

templateSchema.virtual('previewUrl').get(function() {
    return `/api/templates/${this.slug}/preview`;
});

templateSchema.virtual('isFree').get(function() {
    return this.requiredSubscription === 'free';
});

templateSchema.virtual('totalInstalls').get(function() {
    return this.installedBy?.length || 0;
});

templateSchema.virtual('lastInstalledAt').get(function() {
    if (!this.installedBy || this.installedBy.length === 0) return null;
    return this.installedBy[this.installedBy.length - 1]?.installedAt;
});

// ============================================
// ✅ Pre-save Middleware
// ============================================
templateSchema.pre('save', function(next) {
    this.updatedAt = Date.now();
    
    // إنشاء slug من الاسم إذا لم يكن موجوداً
    if (!this.slug && this.name) {
        this.slug = this.name
            .toLowerCase()
            .replace(/[^a-z0-9]+/g, '-')
            .replace(/^-|-$/g, '');
    }
    
    // تنظيف روابط الصور
    if (this.previewImages && this.previewImages.length > 0) {
        this.previewImages = this.previewImages.filter(img => img && img.trim() !== '');
    }
    
    // تحديث متوسط التقييم عند إضافة مراجعة جديدة
    if (this.reviews && this.reviews.length > 0) {
        const totalRating = this.reviews.reduce((sum, r) => sum + r.rating, 0);
        this.rating = totalRating / this.reviews.length;
        this.ratingCount = this.reviews.length;
    }
    
    next();
});

// ============================================
// ✅ Static Methods
// ============================================

/**
 * جلب القوالب المميزة
 */
templateSchema.statics.getFeatured = async function(limit = 6) {
    return this.find({ isActive: true, isFeatured: true })
        .sort({ downloadsCount: -1, rating: -1 })
        .limit(limit)
        .select('name slug category previewImage downloadsCount rating requiredSubscription themeData.storeInfo');
};

/**
 * جلب القوالب الأكثر تحميلاً
 */
templateSchema.statics.getMostDownloaded = async function(limit = 12) {
    return this.find({ isActive: true })
        .sort({ downloadsCount: -1 })
        .limit(limit)
        .select('name slug category previewImage downloadsCount rating requiredSubscription');
};

/**
 * جلب قوالب حسب التصنيف
 */
templateSchema.statics.getByCategory = async function(category, limit = 20) {
    return this.find({ isActive: true, category })
        .sort({ downloadsCount: -1 })
        .limit(limit);
};

/**
 * البحث في القوالب
 */
templateSchema.statics.searchTemplates = async function(query, filters = {}) {
    const searchQuery = { isActive: true };
    
    if (query) {
        searchQuery.$text = { $search: query };
    }
    
    if (filters.category && filters.category !== 'all') {
        searchQuery.category = filters.category;
    }
    
    if (filters.requiredSubscription && filters.requiredSubscription !== 'all') {
        searchQuery.requiredSubscription = filters.requiredSubscription;
    }
    
    if (filters.minRating) {
        searchQuery.rating = { $gte: parseFloat(filters.minRating) };
    }
    
    let sort = {};
    switch (filters.sort) {
        case 'popular': sort = { downloadsCount: -1 }; break;
        case 'rating': sort = { rating: -1 }; break;
        case 'newest': sort = { createdAt: -1 }; break;
        default: sort = { downloadsCount: -1 };
    }
    
    return this.find(searchQuery)
        .sort(sort)
        .limit(filters.limit || 20)
        .skip(filters.offset || 0);
};

/**
 * زيادة عدد المشاهدات
 */
templateSchema.statics.incrementViews = async function(templateId) {
    return this.findByIdAndUpdate(templateId, { $inc: { viewsCount: 1 } });
};

/**
 * زيادة عدد التحميلات وتسجيل التثبيت
 */
templateSchema.statics.recordDownload = async function(templateId, userId, storeId, appliedSettings = {}) {
    const template = await this.findById(templateId);
    if (!template) throw new Error('Template not found');
    
    template.downloadsCount += 1;
    
    // تسجيل التثبيت مع الإعدادات المطبقة
    template.installedBy.push({ 
        userId, 
        storeId, 
        installedAt: new Date(),
        appliedSettings 
    });
    
    // الاحتفاظ بآخر 100 تثبيت فقط
    if (template.installedBy.length > 100) {
        template.installedBy = template.installedBy.slice(-100);
    }
    
    await template.save();
    return template;
};

/**
 * إضافة تقييم للقالب
 */
templateSchema.statics.addReview = async function(templateId, userId, rating, comment) {
    const template = await this.findById(templateId);
    if (!template) throw new Error('Template not found');
    
    const existingReview = template.reviews.find(r => r.userId.toString() === userId);
    if (existingReview) {
        existingReview.rating = rating;
        existingReview.comment = comment;
        existingReview.createdAt = new Date();
    } else {
        template.reviews.push({ userId, rating, comment });
    }
    
    await template.save();
    return template;
};

/**
 * جلب قوالب مشابهة حسب التصنيف والعلامات
 */
templateSchema.statics.getSimilarTemplates = async function(templateId, limit = 4) {
    const template = await this.findById(templateId);
    if (!template) return [];
    
    return this.find({
        isActive: true,
        _id: { $ne: templateId },
        $or: [
            { category: template.category },
            { tags: { $in: template.tags } }
        ]
    })
    .sort({ downloadsCount: -1, rating: -1 })
    .limit(limit);
};

/**
 * تحديث إحصائيات القالب بعد التطبيق
 */
templateSchema.statics.updateAfterApply = async function(templateId, userId, success = true) {
    if (!success) return;
    
    const template = await this.findById(templateId);
    if (template) {
        template.downloadsCount += 1;
        
        // تحديث آخر تثبيت ناجح
        const existingInstall = template.installedBy.find(i => i.userId.toString() === userId);
        if (existingInstall) {
            existingInstall.installedAt = new Date();
        } else {
            template.installedBy.push({ userId, storeId: userId, installedAt: new Date() });
        }
        
        await template.save();
    }
};

const TemplateStore = mongoose.model('TemplateStore', templateSchema);

module.exports = TemplateStore;