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> = [
    /\bMath\.random\b/,
    /\bDate\.now\b/,
    /\bcrypto\.getRandomValues\b/,
];

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/ contains no Math.random, Date.now, or crypto.getRandomValues", {
        timeout: 5000,
    }, () => {
        const hits: string[] = [];
        for (const file of walk(SRC)) {
            const content = readFileSync(file, "utf8");
            for (const pattern of BANNED) {
                if (pattern.test(content)) hits.push(`${file}: ${pattern}`);
            }
        }
        expect(hits).toEqual([]);
    });
});