// mirrors chunk A — see ../../src/transports/transport.types.ts header for spec link.
import { readdir, readFile, stat } from "node:fs/promises";
import { dirname, join, resolve } from "node:path";
import { fileURLToPath } from "node:url";
import { describe, expect, it } from "@suaveplan/testing/runner";

const HERE = dirname(fileURLToPath(import.meta.url));
const TRANSPORTS = resolve(HERE, "..", "..", "src", "transports");

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

describe("webrtc transport bundle purity", () => {
    it("only the trystero adapter source references trystero", {
        timeout: 5000,
    }, async () => {
        const files = await walk(TRANSPORTS);
        expect(files.length).toBeGreaterThan(0);
        const offenders: string[] = [];
        for (const file of files) {
            const text = await readFile(file, "utf8");
            if (!text.includes("network-discovery-trystero")) continue;
            if (file.includes(`${"trystero".toString()}/`)) continue;
            offenders.push(file);
        }
        expect(offenders).toEqual([]);
    });

    it("webrtc and websocket adapters do not import trystero", {
        timeout: 5000,
    }, async () => {
        const targets = [
            join(TRANSPORTS, "webrtc", "webrtc-transport.ts"),
            join(TRANSPORTS, "webrtc", "webrtc-transport.types.ts"),
            join(TRANSPORTS, "webrtc", "index.ts"),
            join(TRANSPORTS, "websocket", "websocket-transport.ts"),
            join(TRANSPORTS, "websocket", "websocket-transport.types.ts"),
            join(TRANSPORTS, "websocket", "index.ts"),
            join(TRANSPORTS, "transport.types.ts"),
        ];
        for (const file of targets) {
            const text = await readFile(file, "utf8");
            expect(text.includes("network-discovery-trystero")).toBe(false);
            expect(text.includes('from "trystero"')).toBe(false);
        }
    });

    it("trystero adapter uses a lazy loader, never a static import", {
        timeout: 5000,
    }, async () => {
        const text = await readFile(
            join(TRANSPORTS, "trystero", "trystero-transport.ts"),
            "utf8"
        );
        const staticImport =
            /^\s*import\s+[^;]*from\s+["']@suaveplan\/network-discovery-trystero["']/m;
        expect(staticImport.test(text)).toBe(false);
        expect(text.includes("config.loader")).toBe(true);
    });
});