import { HeadersAdapter } from "../web/spec-extension/adapters/headers";
import { PRERENDER_REVALIDATE_HEADER, PRERENDER_REVALIDATE_ONLY_GENERATED_HEADER } from "../../lib/constants";
/**
 *
 * @param res response object
 * @param statusCode `HTTP` status code of response
 */ export function sendStatusCode(res, statusCode) {
    res.statusCode = statusCode;
    return res;
}
/**
 *
 * @param res response object
 * @param [statusOrUrl] `HTTP` status code of redirect
 * @param url URL of redirect
 */ export function redirect(res, statusOrUrl, url) {
    if (typeof statusOrUrl === "string") {
        url = statusOrUrl;
        statusOrUrl = 307;
    }
    if (typeof statusOrUrl !== "number" || typeof url !== "string") {
        throw new Error(`Invalid redirect arguments. Please use a single argument URL, e.g. res.redirect('/destination') or use a status code and URL, e.g. res.redirect(307, '/destination').`);
    }
    res.writeHead(statusOrUrl, {
        Location: url
    });
    res.write(url);
    res.end();
    return res;
}
export function checkIsOnDemandRevalidate(req, previewProps) {
    const headers = HeadersAdapter.from(req.headers);
    const previewModeId = headers.get(PRERENDER_REVALIDATE_HEADER);
    const isOnDemandRevalidate = previewModeId === previewProps.previewModeId;
    const revalidateOnlyGenerated = headers.has(PRERENDER_REVALIDATE_ONLY_GENERATED_HEADER);
    return {
        isOnDemandRevalidate,
        revalidateOnlyGenerated
    };
}
export const COOKIE_NAME_PRERENDER_BYPASS = `__prerender_bypass`;
export const COOKIE_NAME_PRERENDER_DATA = `__next_preview_data`;
export const RESPONSE_LIMIT_DEFAULT = 4 * 1024 * 1024;
export const SYMBOL_PREVIEW_DATA = Symbol(COOKIE_NAME_PRERENDER_DATA);
export const SYMBOL_CLEARED_COOKIES = Symbol(COOKIE_NAME_PRERENDER_BYPASS);
export function clearPreviewData(res, options = {}) {
    if (SYMBOL_CLEARED_COOKIES in res) {
        return res;
    }
    const { serialize  } = require("next/dist/compiled/cookie");
    const previous = res.getHeader("Set-Cookie");
    res.setHeader(`Set-Cookie`, [
        ...typeof previous === "string" ? [
            previous
        ] : Array.isArray(previous) ? previous : [],
        serialize(COOKIE_NAME_PRERENDER_BYPASS, "", {
            // To delete a cookie, set `expires` to a date in the past:
            // https://tools.ietf.org/html/rfc6265#section-4.1.1
            // `Max-Age: 0` is not valid, thus ignored, and the cookie is persisted.
            expires: new Date(0),
            httpOnly: true,
            sameSite: process.env.NODE_ENV !== "development" ? "none" : "lax",
            secure: process.env.NODE_ENV !== "development",
            path: "/",
            ...options.path !== undefined ? {
                path: options.path
            } : undefined
        }),
        serialize(COOKIE_NAME_PRERENDER_DATA, "", {
            // To delete a cookie, set `expires` to a date in the past:
            // https://tools.ietf.org/html/rfc6265#section-4.1.1
            // `Max-Age: 0` is not valid, thus ignored, and the cookie is persisted.
            expires: new Date(0),
            httpOnly: true,
            sameSite: process.env.NODE_ENV !== "development" ? "none" : "lax",
            secure: process.env.NODE_ENV !== "development",
            path: "/",
            ...options.path !== undefined ? {
                path: options.path
            } : undefined
        })
    ]);
    Object.defineProperty(res, SYMBOL_CLEARED_COOKIES, {
        value: true,
        enumerable: false
    });
    return res;
}
/**
 * Custom error class
 */ export class ApiError extends Error {
    constructor(statusCode, message){
        super(message);
        this.statusCode = statusCode;
    }
}
/**
 * Sends error in `response`
 * @param res response object
 * @param statusCode of response
 * @param message of response
 */ export function sendError(res, statusCode, message) {
    res.statusCode = statusCode;
    res.statusMessage = message;
    res.end(message);
}
/**
 * Execute getter function only if its needed
 * @param LazyProps `req` and `params` for lazyProp
 * @param prop name of property
 * @param getter function to get data
 */ export function setLazyProp({ req  }, prop, getter) {
    const opts = {
        configurable: true,
        enumerable: true
    };
    const optsReset = {
        ...opts,
        writable: true
    };
    Object.defineProperty(req, prop, {
        ...opts,
        get: ()=>{
            const value = getter();
            // we set the property on the object to avoid recalculating it
            Object.defineProperty(req, prop, {
                ...optsReset,
                value
            });
            return value;
        },
        set: (value)=>{
            Object.defineProperty(req, prop, {
                ...optsReset,
                value
            });
        }
    });
}

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