"use strict";

import { mkdirsSync, removeSync } from "fs-extra";
import { Remote, Repository } from "nodegit";

import { gitToFs } from "./copy";

const fixUrl = (url) => {
    if (!url.startsWith("https://")) {
        return url;
    }

    return `git://${url.substr("https://".length)}`;
};

/* Example:
options = {
    "remote": "https://github.com/visionmedia/express.git",
    "local": "D:\\data\\repositories\\visionmedia\\express.git\\",
    "branch": "1.x",
    "hash": "82e15cf321fccf3215068814d1ea1aeb3581ddb3",
    "exported": "D:\\data\\exportedsource\\visionmedia\\express\\82e15cf321fccf3215068814d1ea1aeb3581ddb3\\",
}
 */

export const gitLoader = (options, globalCallback) => {
    const url = fixUrl(options.remote);
    const path = `${options.local}/${options.hash}`;
    const exported = options.exported;

    removeSync(path);
    mkdirsSync(path);

    console.log(`Cloning ${url} to ${path}`);

    Repository.init(path, 1)
        .catch(globalCallback)
        .then((repo) => Remote.create(repo, "origin", url)
            .catch(globalCallback)
            .then((remote) => remote.fetch([options.branch])
                .catch(globalCallback)
                .then((errorNumber) => {
                    if (errorNumber) {
                        return globalCallback(`Failed to fetch commit: error number ${errorNumber}`);
                    }

                    console.log(`Cloned ${url} to ${path}`);

                    return repo.getCommit(options.hash)
                        .catch(globalCallback)
                        .then((commit) => {
                            removeSync(exported);
                            mkdirsSync(exported);

                            gitToFs(commit, exported, (err, result) => {
                                repo.free();

                                return globalCallback(err, result);
                            });
                        });
                })));
};