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

async function walk(dir: string, out: string[] = []): Promise<string[]> {
    const entries = await fs.readdir(dir, { withFileTypes: true });
    for (const entry of entries) {
        const full = join(dir, entry.name);
        if (entry.isDirectory()) {
            await walk(full, out);
        } else if (entry.isFile() && entry.name.endsWith(".ts")) {
            out.push(full);
        }
    }
    return out;
}

describe("zod import form", () => {
    it("every src file uses default-import z", { timeout: 5000 }, async () => {
        const files = await walk(join(__dirname, "..", "src"));
        const bad: string[] = [];
        for (const file of files) {
            const text = await fs.readFile(file, "utf8");
            // Detect named z import: `import { ... z ... } from "zod"`
            const namedImport =
                /import\s*\{[^}]*\bz\b[^}]*\}\s*from\s*["']zod["']/m;
            if (namedImport.test(text)) {
                bad.push(file);
            }
        }
        expect(bad).toEqual([]);
    });
});