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

const addProductScene = new Scenes.WizardScene(
    'ADD_PRODUCT_SCENE',
    // Step 1: Ask Category (First!)
    async (ctx) => {
        // Ensure localization logic
        if (!ctx.i18n) {
            const locales = require('../../locales');
            const User = require('../../models/User');
            const user = await User.findOne({ id: ctx.from.id });
            ctx.i18n = locales[user ? user.language : 'uz'];
        }
        const i18n = ctx.i18n;

        // Init State
        ctx.wizard.state.product = { media: [] };

        const categories = await Category.find();
        let buttons = categories.map(c => c.name);
        buttons.push(i18n.admin.new_cat || "➕ Yangi Kategoriya");
        buttons.push(i18n.btn_cancel || "❌ Bekor qilish");

        // Filter out any undefined values to prevent crashes
        buttons = buttons.filter(b => b);

        ctx.reply(i18n.admin.enter_cat || "📂 Kategoriyani tanlang:", Markup.keyboard(buttons, { columns: 2 }).resize());
        return ctx.wizard.next();
    },
    // Step 2: Handle Category -> Ask Name
    async (ctx) => {
        const i18n = ctx.i18n;
        const text = ctx.message?.text;

        if (text === i18n.btn_cancel) {
            ctx.scene.leave();
            userController.start(ctx, i18n.cancel_process);
            return;
        }

        if (text === (i18n.admin.new_cat || "➕ Yangi Kategoriya")) {
            ctx.wizard.state.isNewCategory = true;
            ctx.reply(i18n.admin.enter_new_cat, Markup.keyboard([[i18n.btn_cancel]]).resize());
            return ctx.wizard.selectStep(2); // Go to New Category Handler
        }

        // Validate Existing Category
        // We accept text input as category name too, or check against DB if strict
        ctx.wizard.state.product.category = text;

        ctx.reply(i18n.admin.add_product_title || "✏️ Mahsulot nomini kiriting:", Markup.keyboard([[i18n.btn_cancel]]).resize());
        return ctx.wizard.selectStep(3); // Go to Name Handler
    },
    // Step 3: Handle New Category (If selected) -> Then Ask Name
    async (ctx) => {
        const i18n = ctx.i18n;
        const text = ctx.message?.text;
        if (text === i18n.btn_cancel) {
            ctx.scene.leave();
            userController.start(ctx, i18n.cancel_process);
            return;
        }

        // Save New Category
        try {
            await new Category({ id: Date.now().toString(), name: text }).save();
            ctx.reply(`${i18n.admin.new_cat}: ${text}`);
            ctx.wizard.state.product.category = text;

            ctx.reply(i18n.admin.add_product_title || "✏️ Mahsulot nomini kiriting:", Markup.keyboard([[i18n.btn_cancel]]).resize());
            return ctx.wizard.next();
        } catch (e) {
            ctx.reply("Xatolik: " + e.message);
            return;
        }
    },
    // Step 4: Handle Name -> Ask Condition
    (ctx) => {
        const i18n = ctx.i18n;
        if (ctx.message.text === i18n.btn_cancel) return ctx.scene.leave();

        ctx.wizard.state.product.name = ctx.message.text;

        ctx.reply("🆕 Mahsulot holatini tanlang:", Markup.keyboard([
            ["🆕 Yangi", "♻️ B/U"],
            [i18n.btn_cancel]
        ]).resize());
        return ctx.wizard.next();
    },
    // Step 5: Handle Condition -> Ask Price
    (ctx) => {
        const i18n = ctx.i18n;
        const text = ctx.message.text;
        if (text === i18n.btn_cancel) {
            ctx.scene.leave();
            userController.start(ctx, i18n.cancel_process);
            return;
        }

        if (text === "🆕 Yangi") ctx.wizard.state.product.condition = "new";
        else if (text === "♻️ B/U") ctx.wizard.state.product.condition = "used";
        else return ctx.reply("Iltimos tugmani tanlang: Yangi yoki B/U");

        ctx.reply(i18n.admin.enter_price, Markup.keyboard([[i18n.btn_cancel]]).resize());
        return ctx.wizard.next();
    },
    // Step 6: Handle Price -> Ask Quantity
    (ctx) => {
        const i18n = ctx.i18n;
        if (ctx.message.text === i18n.btn_cancel) return ctx.scene.leave();

        if (isNaN(ctx.message.text)) return ctx.reply(i18n.admin.error_num);
        ctx.wizard.state.product.price = parseInt(ctx.message.text);

        ctx.reply(i18n.admin.enter_qty, Markup.keyboard([[i18n.btn_cancel]]).resize());
        return ctx.wizard.next();
    },
    // Step 7: Handle Quantity -> Ask Description
    (ctx) => {
        const i18n = ctx.i18n;
        if (ctx.message.text === i18n.btn_cancel) return ctx.scene.leave();

        if (isNaN(ctx.message.text)) return ctx.reply(i18n.admin.error_num);
        ctx.wizard.state.product.quantity = parseInt(ctx.message.text);

        ctx.reply(i18n.admin.enter_desc, Markup.keyboard([[i18n.btn_cancel]]).resize());
        return ctx.wizard.next();
    },
    // Step 8: Handle Description -> Ask Media
    (ctx) => {
        const i18n = ctx.i18n;
        if (ctx.message.text === i18n.btn_cancel) return ctx.scene.leave();

        ctx.wizard.state.product.description = ctx.message.text;

        ctx.reply(i18n.admin.media_prompt, Markup.keyboard([i18n.admin.media_done, i18n.btn_cancel]).resize());
        return ctx.wizard.next();
    },
    // Step 9: Handle Media Loop
    async (ctx) => {
        const i18n = ctx.i18n;
        const msg = ctx.message;

        if (msg.text === i18n.btn_cancel) {
            ctx.scene.leave();
            userController.start(ctx, i18n.cancel_process);
            return;
        }

        if (msg.text === i18n.admin.media_done) {
            if (ctx.wizard.state.product.media.length === 0) return ctx.reply(i18n.admin.media_error);

            // Save Product
            try {
                const productData = {
                    id: Date.now(),
                    ...ctx.wizard.state.product
                };
                await new Product(productData).save();
                ctx.reply(`✅ <b>Saqlandi!</b>\n\n${productData.name} (${productData.condition === 'new' ? '🆕' : '♻️'})\n📂 ${productData.category}`, { parse_mode: 'HTML' });

                userController.start(ctx);
                return ctx.scene.leave();
            } catch (e) {
                console.error(e);
                ctx.reply("Error");
                return ctx.scene.leave();
            }
        }

        if (msg.photo) {
            ctx.wizard.state.product.media.push({ type: 'photo', file_id: msg.photo[msg.photo.length - 1].file_id });
            ctx.reply(`Rasm (${ctx.wizard.state.product.media.length}/4)`);
        } else if (msg.video) {
            ctx.wizard.state.product.media.push({ type: 'video', file_id: msg.video.file_id });
            ctx.reply(`Video (${ctx.wizard.state.product.media.length}/4)`);
        }
    }
);

module.exports = addProductScene;