import * as plugins from "./nodehash.plugins";
import * as helpers from "./nodehash.helpers";

/**
 * creates sha256 Hash from Stream
 */
export let sha256FromStream = (input) => {
    let done = plugins.q.defer();
    let hash = plugins.crypto.createHash('sha256');

    hash["setEncoding"]("hex");
    input
        .pipe(hash)
        .pipe(helpers.hashStreamPipeStop(done.resolve));
    return done.promise;
};

/**
 * creates sha256 Hash from File;
 */
export let sha256FromFile = (filePath:string) => {
    let done = plugins.q.defer();
    let absolutePath = plugins.path.resolve(filePath);
    let readableStream = plugins.fs.createReadStream(absolutePath);
    sha256FromStream(readableStream)
        .then((resultHashString) => {
            done.resolve(resultHashString);
        });
    return done.promise;
}

/**
 * Computes sha256 Hash from String synchronously
 */
export let sha256FromStringSync = (stringArg) => {
    let hash = plugins.crypto.createHash('sha256');
    hash.update(stringArg);
    return hash.digest("hex");
};

/**
 * Computes sha256 Hash from String
 */
export let sha256FromString = (stringArg) => {
    let done = plugins.q.defer();
    let hash = plugins.crypto.createHash('sha256');
    hash.update(stringArg);
    let hashResult = hash.digest("hex");
    done.resolve(hashResult);
    return done.promise;
};