import { DefaultVmContext, type GlobalReferenceChain, analyzeGlobalReferences } from '@mirascript/mirascript/subtle';
import type { EvalExpressionCache } from './parser.js';
import type { Scope } from './scope.js';
import type { Evaluator } from './main.js';

const kAnalyze = Symbol('cloudpss.expression.analyzeCache');
export type { GlobalReferenceChain };
/**
 * 分析依赖
 */
export function analyze(
    expression: EvalExpressionCache,
    evaluator: Evaluator,
    scope: Scope,
): readonly GlobalReferenceChain[] {
    let result = (expression as EvalExpressionCache & { [kAnalyze]?: readonly GlobalReferenceChain[] })[kAnalyze];
    if (result == null) {
        result = analyzeGlobalReferences(expression.source);
        (expression as EvalExpressionCache & { [kAnalyze]?: readonly GlobalReferenceChain[] })[kAnalyze] = result;
    }
    return result.filter(([global]) => {
        if (scope.has(global)) return true;
        return !(evaluator.imported.has(global) || DefaultVmContext.has(global));
    });
}