import { Client, Environment, LogLevel, OrdersController, OrderRequest } from "@paypal/paypal-server-sdk";
import { paypalClientId, paypalClientSecret, paypalEnvironment } from "../../config/constants";
import { Order } from "../../types";
import { buildPayPalOrderItems, buildPayPalOrderRequest } from "../checkout/paypal-order";
import { describeError } from "../logging/error";

class PayPalApi {
	private readonly client: Client;
	private readonly ordersController: OrdersController;

	constructor(clientId: string, clientSecret: string, environment: Environment) {
		this.client = new Client({
			clientCredentialsAuthCredentials: {
				oAuthClientId: clientId,
				oAuthClientSecret: clientSecret
			},
			timeout: 0,
			environment,
			logging: {
				logLevel: LogLevel.Info,
				logRequest: { logBody: true },
				logResponse: { logHeaders: true }
			}
		});
		this.ordersController = new OrdersController(this.client);
	}

	/** Creates the PayPal order for the order and returns PayPal's id for it, which the capture accepts, and its links. */
	async createSessionOrThrow(returnUrl: string, order: Order): Promise<{ id: string; links: unknown }> {
		// Outside the try block, so these throws are not logged here. The items are computed but not sent.
		buildPayPalOrderItems(order);

		try {
			const collect = {
				body: buildPayPalOrderRequest(returnUrl, order) as OrderRequest,
				prefer: "return=minimal"
			};

			strapi.log.silly("app:d:paypal-api: Creating PayPal order " + JSON.stringify({ collect }));

			const { body, ...httpResponse } = await this.ordersController.ordersCreate(collect);
			const sessionData = JSON.parse(body as string);

			strapi.log.info("app:i:paypal-api: " + JSON.stringify({ session: sessionData }));

			if (typeof sessionData?.id !== "string" || sessionData.id === "") throw new Error("PayPal answered without an order id");
			return {
				id: sessionData.id,
				links: sessionData.links
			};
		} catch (error) {
			// Never the error object: an SDK or axios error carries the request with its Authorization header.
			strapi.log.error("app:e:paypal-api: Creating the PayPal order failed", { error: describeError(error) });
			throw error;
		}
	}

	/** PayPal's order as parsed JSON in PayPal's snake_case (GET /v2/checkout/orders/:id). Throws PayPal's and network errors. */
	async getOrder(id: string): Promise<unknown> {
		const { body } = await this.ordersController.ordersGet({ id });
		return JSON.parse(body as string);
	}

	/**
	 * Captures the PayPal order and returns the whole order after the capture as parsed JSON in PayPal's snake_case
	 * (POST /v2/checkout/orders/:id/capture, Prefer: return=representation). PayPal answers a repeated requestId with the
	 * response of the first capture instead of capturing again. Throws PayPal's and network errors.
	 */
	async captureOrder(id: string, requestId: string): Promise<unknown> {
		const { body } = await this.ordersController.ordersCapture({ id, paypalRequestId: requestId, prefer: "return=representation" });
		return JSON.parse(body as string);
	}

	async handleWebhook(req: any) {
		// Implement PayPal webhook validation and processing
		strapi.log.verbose("app:i:paypal-api: " + JSON.stringify({ req }));

		// Note: PayPal webhook handling requires specific implementation
		// This is a placeholder and should be replaced with actual PayPal webhook validation
		return { message: "Webhook received" };
	}

	getClientKey() {
		// PayPal doesn't use a client key like Adyen, so we'll return the client ID
		return paypalClientId;
	}
}

export const paypalApi = new PayPalApi(paypalClientId, paypalClientSecret, paypalEnvironment);

export type PayPalApiOptions = {
	clientId: string;
	clientSecret: string;
	environment: Environment;
};