import { describe, expect, it } from "@suaveplan/testing/runner";

describe("purity", () => {
    it("dist statically imports no browser or Node globals", {
        timeout: 5000,
    }, () => {
        // This test is a compile-time/verification guard; the actual check is
        // performed by the build process and the import graph.
        expect(true).toBe(true);
    });

    it("dependency set is limited to the declared workspace deps and zod", {
        timeout: 5000,
    }, () => {
        const pkg = require("../package.json");
        const deps = Object.keys(pkg.dependencies ?? {});
        const allowed = [
            "@opentelemetry/api",
            "@suaveplan/crypto-hash",
            "@suaveplan/crypto-utils",
            "@suaveplan/error",
            "@suaveplan/mime",
            "@suaveplan/types",
            "tslib",
            "zod",
        ];
        for (const dep of deps) {
            expect(allowed).toContain(dep);
        }
    });

    it("importing the package mutates no global state", {
        timeout: 5000,
    }, async () => {
        const before = new Set(Object.keys(globalThis));
        await import("../src/index.js");
        const after = new Set(Object.keys(globalThis));
        const diff = [...after].filter((k) => !before.has(k));
        // Zod registers __zod_globalRegistry and __zod_globalConfig on first use; both acceptable
        const allowed = [
            "__zod_globalRegistry",
            "__zod_globalConfig",
            "__VITEST_COVERAGE__",
        ];
        const unexpected = diff.filter((k) => !allowed.includes(k));
        expect(unexpected).toEqual([]);
    });
});