const { Scenes, Markup } = require('telegraf');
const Product = require('../../models/Product');
const User = require('../../models/User');

const flashSaleScene = new Scenes.WizardScene(
    'admin_flash_sale',

    // Step 1: Menu
    async (ctx) => {
        const text = "🔥 **Flash Sale (Aksiya) Boshqaruvi**\n\nNima qilmoqchisiz?";
        const buttons = [
            [Markup.button.callback("🚀 Aksiya Boshlash", "start_sale")],
            [Markup.button.callback("🛑 Aksiyani To'xtatish (Narxlarni tiklash)", "stop_sale")],
            [Markup.button.callback("🔙 Asosiy menyu", "back_dashboard")]
        ];

        if (ctx.callbackQuery) {
            await ctx.editMessageText(text, { parse_mode: 'Markdown', ...Markup.inlineKeyboard(buttons) });
        } else {
            await ctx.replyWithMarkdown(text, Markup.inlineKeyboard(buttons));
        }
        return ctx.wizard.next();
    },

    // Step 2: Handle Choice
    async (ctx) => {
        if (!ctx.callbackQuery && !ctx.message) return;

        const txt = ctx.message ? ctx.message.text : '';
        if (txt === '/start' || txt === '❌ Bekor qilish') return ctx.scene.leave();

        if (ctx.callbackQuery) {
            const data = ctx.callbackQuery.data;

            if (data === 'back_dashboard') {
                await ctx.scene.leave();
                const adminController = require('../../controllers/adminController');
                return adminController.showDashboard(ctx);
            }

            if (data === 'stop_sale') {
                await ctx.answerCbQuery("Narxlar tiklanmoqda...");
                // Revert Logic
                const products = await Product.find({ originalPrice: { $ne: null } });

                if (products.length === 0) {
                    await ctx.reply("⚠️ Tiklash uchun o'zgartirilgan mahsulotlar topilmadi.");
                    return ctx.scene.leave();
                }

                let count = 0;
                for (let p of products) {
                    p.price = p.originalPrice;
                    p.originalPrice = null; // Clear history
                    p.discountPercent = 0; // Reset discount
                    await p.save();
                    count++;
                }

                await ctx.reply(`✅ <b>Aksiya tugatildi.</b>\n${count} ta mahsulot narxi joyiga qaytarildi.`, { parse_mode: 'HTML' });
                return ctx.scene.leave();
            }

            if (data === 'start_sale') {
                await ctx.reply("📉 <b>Chegirma foizini kiriting:</b>\nMasalan: 10 (10% arzonlashadi)\n\n<i>Eslatma: Bu barcha mahsulotlarga ta'sir qiladi!</i>", { parse_mode: 'HTML', ...Markup.keyboard([['❌ Bekor qilish']]).resize() });
                ctx.wizard.state.action = 'get_percent';
                return ctx.wizard.next();
            }
        }
    },

    // Step 3: Apply Discount
    async (ctx) => {
        const txt = ctx.message ? ctx.message.text : '';
        if (txt === '❌ Bekor qilish') {
            await ctx.reply("Bekor qilindi.", Markup.removeKeyboard());
            await ctx.scene.leave();
            const adminController = require('../../controllers/adminController');
            return adminController.showDashboard(ctx);
        }

        const percent = parseInt(txt);
        if (isNaN(percent) || percent <= 0 || percent >= 100) {
            await ctx.reply("⚠️ Iltimos, to'g'ri foiz kiriting (1-99 oralig'ida).");
            return;
        }

        await ctx.reply(`⏳ ${percent}% chegirma qo'llanmoqda...`);

        const products = await Product.find({});
        let count = 0;

        for (let p of products) {
            try {
                // Skip invalid products (corrupt data)
                if (!p.id || !p.name) {
                    console.warn(`Skipping invalid product (Missing ID/Name): ${p._id}`);
                    continue;
                }

                // Only update if not already discounted (prevent double discount)
                // Or overwrite? Let's assume overwrite logic:
                // If already has originalPrice, use THAT as base. If not, use current price.

                let basePrice = p.originalPrice || p.price;

                // Save original price if not already saved
                if (!p.originalPrice) {
                    p.originalPrice = basePrice;
                }

                // Calculate new price
                const discountAmount = (basePrice * percent) / 100;
                p.price = Math.round(basePrice - discountAmount);
                p.discountPercent = percent; // Save percent display

                await p.save();
                count++;
            } catch (err) {
                console.error(`Failed to update product ${p.id}:`, err.message);
            }
        }

        const User = require('../../models/User'); // Ensure User model is required at top

        // ... inside the scene ...

        await ctx.reply(`✅ <b>Aksiya Boshlandi!</b>\n\n${count} ta mahsulot narxi ${percent}% ga arzonlashtirildi.`, { parse_mode: 'HTML', ...Markup.removeKeyboard() });

        // --- BROADCAST NOTIFICATION ---
        await ctx.reply("📢 Foydalanuvchilarga xabar yuborilmoqda...");

        const users = await User.find({});
        let sent = 0;
        const message = `🔥 <b>DIQQAT AKSIYA!</b>\n\n🎉 Do'konimizda <b>FLASH SALE</b> boshlandi!\n\n📉 Barcha mahsulotlarga <b>${percent}% CHEGIRMA</b> e'lon qilindi.\n\nHoziroq xarid qiling, aksiya vaqti chegaralangan! ⏳\n\n👇👇👇`;

        for (let user of users) {
            try {
                await ctx.telegram.sendMessage(user.id, message, { parse_mode: 'HTML' });
                sent++;
            } catch (e) {
                // User blocked bot or inactive
            }
            // Small delay to prevent spam flood
            await new Promise(r => setTimeout(r, 50));
        }

        await ctx.reply(`📢 Xabar ${sent} ta foydalanuvchiga yuborildi.`);

        await ctx.scene.leave();
        const adminController = require('../../controllers/adminController');
        return adminController.showDashboard(ctx);
    }
);

module.exports = flashSaleScene;