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

const PKG_ROOT = join(__dirname, "..");
const SRC = join(PKG_ROOT, "src");

async function walk(dir: string): Promise<string[]> {
    const out: string[] = [];
    for (const entry of await readdir(dir)) {
        const full = join(dir, entry);
        const s = await stat(full);
        if (s.isDirectory()) {
            out.push(...(await walk(full)));
        } else {
            out.push(full);
        }
    }
    return out;
}

describe("dep-graph", () => {
    it("each adapter has its own subpath", { timeout: 5000 }, async () => {
        const pkg = JSON.parse(
            await readFile(join(PKG_ROOT, "package.json"), "utf8")
        ) as { exports: Record<string, unknown> };
        const exportKeys = Object.keys(pkg.exports);
        expect(exportKeys).toContain("./adapters/surrealql/surrealql");
        expect(exportKeys).toContain("./adapters/postgres/postgres");
        expect(exportKeys).toContain("./adapters/sqlite/sqlite");
    });

    it("subpath exports cover every feature module", {
        timeout: 5000,
    }, async () => {
        const pkg = JSON.parse(
            await readFile(join(PKG_ROOT, "package.json"), "utf8")
        ) as { exports: Record<string, unknown> };
        const expected = [
            ".",
            "./runner/runner",
            "./adapters/surrealql/surrealql",
            "./adapters/postgres/postgres",
            "./adapters/sqlite/sqlite",
            "./otel/instruments",
            "./error-codes/error-codes",
            "./types/migration",
        ];
        for (const key of expected) {
            expect(Object.keys(pkg.exports)).toContain(key);
        }
    });

    it("every impl .ts has a sibling .md", { timeout: 5000 }, async () => {
        const files = await walk(SRC);
        const missing: string[] = [];
        for (const file of files) {
            if (!file.endsWith(".ts")) continue;
            if (file.endsWith(".test.ts")) continue;
            if (file.endsWith(".types.ts")) continue;
            if (file.endsWith("/index.ts")) continue;
            if (file.endsWith("/api-migrations.spec-conformance.test.ts")) {
                continue;
            }
            const md = file.replace(/\.ts$/, ".md");
            try {
                await stat(md);
            } catch {
                missing.push(md);
            }
        }
        expect(missing).toEqual([]);
    });
});