import * as child_process from "child_process";
import {
    dirname as pathDirname,
    basename as pathBasename,
    join as pathJoin,
    sep as pathSep
} from "path";
import { Deferred } from "evt/tools/Deferred";
import * as fs from "fs";

export function getIsKnownByGit(params: { filePath: string }): Promise<boolean> {
    const { filePath } = params;

    const dIsKnownByGit = new Deferred<boolean>();

    let relativePath = pathBasename(filePath);

    let dirPath = pathDirname(filePath);

    while (!fs.existsSync(dirPath)) {
        relativePath = pathJoin(pathBasename(dirPath), relativePath);

        dirPath = pathDirname(dirPath);
    }

    child_process.exec(
        `git ls-files --error-unmatch '${relativePath.split(pathSep).join("/")}'`,
        { cwd: dirPath },
        error => {
            if (error === null) {
                dIsKnownByGit.resolve(true);
                return;
            }

            if (error.code === 1) {
                dIsKnownByGit.resolve(false);
                return;
            }

            dIsKnownByGit.reject(error);
        }
    );

    return dIsKnownByGit.pr;
}