import { Body, Controller, Get, HttpStatus, Post, Req, Res, UseFilters } from '@nestjs/common';
import { ConfigService } from '@nestjs/config';
import { Throttle } from '@nestjs/throttler';
import type { Request, Response } from 'express';
import { throttleProfiles } from '../../../config/throttleProfiles';
import type { Config } from '../../../types/Config';
import { paymentMethodIconUrl } from '../../../consts/paymentMethodIconUrl';
import { paymentMethodLabel } from '../../../consts/paymentMethodLabel';
import { StorefrontExceptionFilter } from '../../storefrontCore/filters/StorefrontExceptionFilter';
import { StorefrontCartCookieService } from '../../storefrontCore/services/StorefrontCartCookieService';
import { StorefrontCheckoutSessionCookieService } from '../../storefrontCore/services/StorefrontCheckoutSessionCookieService';
import { StorefrontDiscountCookieService } from '../../storefrontCore/services/StorefrontDiscountCookieService';
import { StorefrontFeedbackCookieService } from '../../storefrontCore/services/StorefrontFeedbackCookieService';
import { StorefrontCaptchaCookieService } from '../../storefrontCore/services/StorefrontCaptchaCookieService';
import { StorefrontCaptchaService } from '../../storefrontCore/services/StorefrontCaptchaService';
import { StorefrontShopViewService } from '../../storefrontCore/services/StorefrontShopViewService';
import { safeInternalShopRedirectPath } from '../../../utils/safeInternalShopRedirectPath';
import { AddToCartDto } from '../dto/AddToCartDto';
import { ApplyDiscountCodeDto } from '../dto/ApplyDiscountCodeDto';
import { RemoveDiscountCodeDto } from '../dto/RemoveDiscountCodeDto';
import { RemoveFromCartDto } from '../dto/RemoveFromCartDto';
import { UpdateCartQtyDto } from '../dto/UpdateCartQtyDto';
import { StorefrontCartService } from '../services/StorefrontCartService';
import { StorefrontDiscountService } from '../services/StorefrontDiscountService';
import type { CartCookieMutation } from '../types/CartCookieMutation';
import type { DiscountCookieMutation } from '../types/DiscountCookieMutation';

@Controller()
@UseFilters(StorefrontExceptionFilter)
export class StorefrontCartController {
    constructor(
        private readonly cartService: StorefrontCartService,
        private readonly discountService: StorefrontDiscountService,
        private readonly shopViewService: StorefrontShopViewService,
        private readonly cartCookieService: StorefrontCartCookieService,
        private readonly discountCookieService: StorefrontDiscountCookieService,
        private readonly feedbackCookieService: StorefrontFeedbackCookieService,
        private readonly checkoutSessionCookieService: StorefrontCheckoutSessionCookieService,
        private readonly captchaService: StorefrontCaptchaService,
        private readonly captchaCookieService: StorefrontCaptchaCookieService,
        private readonly configService: ConfigService
    ) {}

    @Get('shop/cart')
    @Throttle(throttleProfiles.cartPage)
    async cartSummary(@Req() req: Request, @Res() res: Response) {
        const checkoutSessionId = this.checkoutSessionCookieService.getSessionId(req, res);

        if (checkoutSessionId) {
            res.redirect(HttpStatus.FOUND, '/shop/checkout');

            return;
        }

        const cart = this.cartCookieService.getCart(req, res);
        const discountCodes = this.discountCookieService.getDiscountCodes(req, res);

        const [summary, shopLocals] = await Promise.all([
            this.cartService.getCartSummary(cart, discountCodes),
            this.shopViewService.buildShopRenderLocals(req, res, {
                title: 'Cart',
                metaDescription: 'Review your cart at {shopName}.'
            })
        ]);

        const { svg: captchaSvg, encryptedAnswer } = this.captchaService.create();

        this.captchaCookieService.setAnswer(req, res, encryptedAnswer);

        const { enabledPaymentMethods } = this.configService.get('shopSettings') as Config['shopSettings'];

        const paymentMethods = enabledPaymentMethods.map(paymentMethod => ({
            paymentMethod,
            paymentMethodLabel: paymentMethodLabel[paymentMethod],
            iconUrl: paymentMethodIconUrl[paymentMethod]
        }));

        return res.render('cart-summary', {
            ...summary,
            ...shopLocals,
            paymentMethods,
            captchaSvg
        });
    }

    @Post('shop/cart/product')
    async addToCart(
        @Req() req: Request,
        @Res() res: Response,
        @Body() { variantId, qty }: AddToCartDto
    ): Promise<void> {
        const cart = this.cartCookieService.getCart(req, res);

        const cartMutation = await this.cartService.addToCart(cart, variantId, qty);

        this.applyCartCookieMutation(req, res, cartMutation);

        this.feedbackCookieService.setFeedback(req, res, {
            type: 'success',
            text: 'Added to cart.'
        });

        res.redirect(HttpStatus.FOUND, this.buildAddToCartRedirectPath(req, variantId));
    }

    @Post('shop/cart/product/update')
    async updateCartQty(
        @Req() req: Request,
        @Res() res: Response,
        @Body() { variantId, qty }: UpdateCartQtyDto
    ): Promise<void> {
        const cart = this.cartCookieService.getCart(req, res);

        const cartMutation = await this.cartService.updateCartQty(cart, variantId, qty);

        this.applyCartCookieMutation(req, res, cartMutation);

        this.feedbackCookieService.setFeedback(req, res, {
            type: 'success',
            text: 'Cart updated.'
        });

        res.redirect(HttpStatus.FOUND, '/shop/cart');
    }

    @Post('shop/cart/product/remove')
    removeFromCart(@Req() req: Request, @Res() res: Response, @Body() { variantId }: RemoveFromCartDto): void {
        const cart = this.cartCookieService.getCart(req, res);

        const cartMutation = this.cartService.removeFromCart(cart, variantId);

        this.applyCartCookieMutation(req, res, cartMutation);

        this.feedbackCookieService.setFeedback(req, res, { type: 'success', text: 'Item removed.' });

        res.redirect(HttpStatus.FOUND, '/shop/cart');
    }

    @Post('shop/cart/discount')
    @Throttle(throttleProfiles.cartDiscount)
    async applyDiscount(
        @Req() req: Request,
        @Res() res: Response,
        @Body() { code }: ApplyDiscountCodeDto
    ): Promise<void> {
        const cart = this.cartCookieService.getCart(req, res);
        const discountCodes = this.discountCookieService.getDiscountCodes(req, res);

        const nextDiscountCodes = await this.cartService.applyDiscountCode(cart, discountCodes, code);

        this.applyDiscountCookieMutation(req, res, nextDiscountCodes);

        this.feedbackCookieService.setFeedback(req, res, {
            type: 'success',
            text: 'Discount code applied.'
        });

        res.redirect(HttpStatus.FOUND, '/shop/cart');
    }

    @Post('shop/cart/discount/remove')
    removeDiscount(@Req() req: Request, @Res() res: Response, @Body() { code }: RemoveDiscountCodeDto): void {
        const discountCodes = this.discountCookieService.getDiscountCodes(req, res);
        const discountMutation = this.discountService.removeDiscountCode(discountCodes, code);

        this.applyDiscountCookieMutation(req, res, discountMutation);

        this.feedbackCookieService.setFeedback(req, res, {
            type: 'success',
            text: 'Discount code removed.'
        });

        res.redirect(HttpStatus.FOUND, '/shop/cart');
    }

    private applyDiscountCookieMutation(req: Request, res: Response, discountMutation: DiscountCookieMutation): void {
        if (discountMutation === null) {
            this.discountCookieService.clearDiscount(req, res);
        } else {
            this.discountCookieService.setDiscountCodes(req, res, discountMutation);
        }
    }

    private applyCartCookieMutation(req: Request, res: Response, cartMutation: CartCookieMutation): void {
        if (cartMutation === null) {
            this.cartCookieService.clearCart(req, res);
            this.discountCookieService.clearDiscount(req, res);
        } else {
            this.cartCookieService.setCart(req, res, cartMutation);
        }
    }

    private buildAddToCartRedirectPath(req: Request, variantId: string): string {
        const redirectPath = safeInternalShopRedirectPath(req);
        const pathname = redirectPath.split('?')[0] ?? redirectPath;
        const isProductsIndexPath = pathname === '/' || pathname.startsWith('/shop/categories/');

        if (!isProductsIndexPath) {
            return redirectPath;
        }

        const anchor = `product-card-${variantId}`;

        return `${redirectPath}#${anchor}`;
    }
}