import { makeFetch } from "../../../../../ChillMainBundle/Resources/public/lib/api/apiMethods";
import { PostStoreObjectSignature, StoredObject } from "../../types";

const algo = "AES-CBC";

const URL_POST = "/asyncupload/temp_url/generate/post";

const keyDefinition = {
    name: algo,
    length: 256,
};

const createFilename = (): string => {
    let text = "";
    const possible =
        "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

    for (let i = 0; i < 7; i++) {
        text += possible.charAt(Math.floor(Math.random() * possible.length));
    }

    return text;
};

/**
 * Fetches a new stored object from the server.
 *
 * @async
 * @function fetchNewStoredObject
 * @returns {Promise<StoredObject>} A Promise that resolves to the newly created StoredObject.
 */
export const fetchNewStoredObject = async (): Promise<StoredObject> => {
    return makeFetch("POST", "/api/1.0/doc-store/stored-object/create", null);
};

export const uploadVersion = async (
    uploadFile: ArrayBuffer,
    storedObject: StoredObject,
): Promise<string> => {
    const params = new URLSearchParams();
    params.append("expires_delay", "180");
    params.append("submit_delay", "180");
    const asyncData: PostStoreObjectSignature = await makeFetch(
        "GET",
        `/api/1.0/doc-store/async-upload/temp_url/${storedObject.uuid}/generate/post` +
            "?" +
            params.toString(),
    );
    const suffix = createFilename();
    const filename = asyncData.prefix + suffix;
    const formData = new FormData();
    formData.append("redirect", asyncData.redirect);
    formData.append("max_file_size", asyncData.max_file_size.toString());
    formData.append("max_file_count", asyncData.max_file_count.toString());
    formData.append("expires", asyncData.expires.toString());
    formData.append("signature", asyncData.signature);
    formData.append(filename, new Blob([uploadFile]), suffix);

    const response = await window.fetch(asyncData.url, {
        method: "POST",
        body: formData,
    });

    if (!response.ok) {
        console.error("Error while sending file to store", response);
        throw new Error(response.statusText);
    }

    return Promise.resolve(filename);
};

export const encryptFile = async (
    originalFile: ArrayBuffer,
): Promise<[ArrayBuffer, Uint8Array, JsonWebKey]> => {
    const iv = crypto.getRandomValues(new Uint8Array(16));
    const key = await window.crypto.subtle.generateKey(keyDefinition, true, [
        "encrypt",
        "decrypt",
    ]);
    const exportedKey = await window.crypto.subtle.exportKey("jwk", key);
    const encrypted = await window.crypto.subtle.encrypt(
        { name: algo, iv: iv },
        key,
        originalFile,
    );

    return Promise.resolve([encrypted, iv, exportedKey]);
};