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

const PKG_ROOT = resolve(__dirname, "..");
const DIST = join(PKG_ROOT, "dist");

/**
 * Chunk-A runtime dependency allowlist. Chunks B/C/D may extend this
 * (`@suaveplan/network-transport-websockets`, `@suaveplan/retry`, etc.);
 * the parent spec's `tests/exports.test.ts` enforces the full union
 * once every chunk has landed.
 */
const ALLOWED_RUNTIME_DEPS = new Set([
    "@suaveplan/audio-fx-plugin-base",
    "@suaveplan/audio-transport",
    "@suaveplan/error",
    "@suaveplan/events",
    "@suaveplan/fsm",
    "@suaveplan/network-transport-websockets",
    "@suaveplan/opentelemetry",
    "@suaveplan/react-audio",
    "@suaveplan/retry",
    "@suaveplan/types",
    "@opentelemetry/api",
    "tslib",
    "zod",
    "zustand",
]);

function walk(dir: string, out: string[] = []): string[] {
    if (!existsSync(dir)) return out;
    for (const name of readdirSync(dir)) {
        const p = join(dir, name);
        if (statSync(p).isDirectory()) walk(p, out);
        else if (/\.(js|mjs|cjs)$/.test(name)) out.push(p);
    }
    return out;
}

describe("react-audio-stream purity gates", () => {
    it("runtime dependency set matches the allowlist", {
        timeout: 5000,
    }, () => {
        const pkg = JSON.parse(
            readFileSync(join(PKG_ROOT, "package.json"), "utf8")
        ) as { dependencies?: Record<string, string> };
        const deps = Object.keys(pkg.dependencies ?? {});
        for (const dep of deps) {
            expect(ALLOWED_RUNTIME_DEPS.has(dep)).toBe(true);
        }
        for (const allowed of ALLOWED_RUNTIME_DEPS) {
            expect(deps.includes(allowed)).toBe(true);
        }
    });

    it("dist references no audio context", { timeout: 30000 }, () => {
        if (!existsSync(DIST)) {
            // Skip pre-build — the package's own test stage runs before
            // `vite build`; the CI pipeline reruns this after `turbo
            // build` so the negative gate is enforced there.
            return;
        }
        const files = walk(DIST);
        const forbidden = [
            /\bnew\s+AudioContext\b/,
            /\bnew\s+OfflineAudioContext\b/,
            /\binstanceof\s+AudioNode\b/,
            /\bAudioWorkletNode\b/,
            /\bregisterProcessor\b/,
        ];
        for (const file of files) {
            const text = readFileSync(file, "utf8");
            for (const rx of forbidden) {
                expect(rx.test(text)).toBe(false);
            }
        }
    });
});