const _ = require('lodash');
const babelParser = require('@babel/parser');
const { log } = require('@jsdoc/util');

// Exported so we can use them in tests.
const parserOptions = exports.parserOptions = {
    allowAwaitOutsideFunction: true,
    allowImportExportEverywhere: true,
    allowReturnOutsideFunction: true,
    allowSuperOutsideMethod: true,
    allowUndeclaredExports: true,
    plugins: [
        'asyncGenerators',
        'bigInt',
        'classPrivateMethods',
        'classPrivateProperties',
        'classProperties',
        ['decorators', {
            decoratorsBeforeExport: true
        }],
        'doExpressions',
        'dynamicImport',
        'estree',
        'exportDefaultFrom',
        'exportNamespaceFrom',
        'functionBind',
        'functionSent',
        'importMeta',
        'jsx',
        'logicalAssignment',
        'nullishCoalescingOperator',
        'numericSeparator',
        'objectRestSpread',
        'optionalCatchBinding',
        'optionalChaining',
        ['pipelineOperator', {
            proposal: 'minimal'
        }],
        'throwExpressions'
    ],
    ranges: true
};

function parse(source, filename, sourceType) {
    let ast;
    const options = _.defaults({}, parserOptions, {sourceType});

    try {
        ast = babelParser.parse(source, options);
    }
    catch (e) {
        log.error(`Unable to parse ${filename}: ${e.message}`);
    }

    return ast;
}

// TODO: docs
class AstBuilder {
    // TODO: docs
    static build(source, filename, sourceType) {
        return parse(source, filename, sourceType);
    }
}
exports.AstBuilder = AstBuilder;