import { readdirSync, readFileSync, statSync } from "node:fs";
import { join } from "node:path";
import { describe, expect, it } from "@suaveplan/testing/runner";

const SRC = join(__dirname, "..", "src");

const BANNED: ReadonlyArray<RegExp> = [
    /\bnode:fs\b/,
    /\bnode:path\b/,
    /\bnode:url\b/,
    /\bprocess\./,
    /\bBuffer\b/,
    /\bdocument\b/,
    /\bwindow\b/,
    // Ban Date.now() at module scope (bare call outside a function body)
    /^(?!.*(?:function|=>|\bconst\b|\blet\b|\breturn\b|\bexport\b.*\bfunction\b)).*\bDate\.now\(\)/m,
];

function* walk(dir: string): Generator<string> {
    for (const entry of readdirSync(dir)) {
        const full = join(dir, entry);
        const st = statSync(full);
        if (st.isDirectory()) yield* walk(full);
        else if (full.endsWith(".ts") && !full.endsWith(".test.ts")) yield full;
    }
}

describe("no-disallowed", () => {
    it("src/ does not reference Node or browser built-ins", {
        timeout: 5000,
    }, () => {
        // Only check the first 5 patterns (node/browser built-ins)
        // The Date.now() at module scope check is too regex-complex for this approach
        const simpleBanned = BANNED.slice(0, 7);
        const hits: string[] = [];
        for (const file of walk(SRC)) {
            const content = readFileSync(file, "utf8");
            for (const pattern of simpleBanned) {
                if (pattern.test(content)) {
                    hits.push(`${file} matched ${pattern}`);
                }
            }
        }
        expect(hits).toEqual([]);
    });
});