import fs from 'fs';
import path from 'path';
const rootDir = process.cwd();
const config = JSON.parse(fs.readFileSync('jsconfig.json', 'utf-8'));
const { paths, baseUrl } = config.compilerOptions;

function resolveImportPath(importPath, fileBase) {
    if (!importPath) return null;
    importPath = jsConfigPaths(importPath);
    const fileDir = path.dirname(fileBase);
    if (importPath.startsWith('.') || importPath.startsWith('/')) {
        return path.relative(rootDir, path.resolve(fileDir, importPath));
    }

    return importPath;
}
function toRelative(file) {
    return path.relative(rootDir, file);
}

function jsConfigPaths(importPath) {
    for (const [aliasPattern, [target]] of Object.entries(paths)) {
        const alias = aliasPattern.replace('/*', '');
        const targetBase = target.replace('/*', '');

        if (importPath.startsWith(alias)) {
            const rest = importPath.slice(alias.length);
            return path.resolve(baseUrl, targetBase + rest);
        }
    }
    return importPath;
}

export { resolveImportPath, toRelative };