import { join as pathJoin } from "path";
import { existsAsync } from "./fs.existsAsync";
import * as child_process from "child_process";
import { assert } from "tsafe/assert";
import { getIsRootPath } from "../tools/isRootPath";

export async function getInstalledModuleDirPath(params: {
    moduleName: string;
    packageJsonDirPath: string;
}) {
    const { moduleName, packageJsonDirPath } = params;

    {
        let dirPath = packageJsonDirPath;

        while (true) {
            const dirPath_candidate = pathJoin(
                dirPath,
                "node_modules",
                ...moduleName.split("/")
            );

            let doesExist: boolean;

            try {
                doesExist = await existsAsync(dirPath_candidate);
            } catch {
                doesExist = false;
            }

            if (doesExist) {
                return dirPath_candidate;
            }

            if (getIsRootPath(dirPath)) {
                break;
            }

            dirPath = pathJoin(dirPath, "..");
        }
    }

    const dirPath = child_process
        .execSync(`npm list ${moduleName}`, {
            cwd: packageJsonDirPath
        })
        .toString("utf8")
        .trim();

    assert(dirPath !== "");

    return dirPath;
}