/** @file The ingress's mount SQL, on node:sqlite: lookup, overlap, and mounts stored before mount_label. */
import { DatabaseSync } from "node:sqlite";
import { test } from "node:test";
import assert from "node:assert/strict";
import { LOOKUP, MOUNT, MOUNT_LABELS, MOUNT_SCHEMA, OVERLAP } from "../mounts-sql.js";

const makeDb = () => {
	const db = new DatabaseSync(":memory:");
	for (const statement of MOUNT_SCHEMA) db.exec(statement);
	const mount = (vat, labels) => {
		const json = JSON.stringify(labels);
		db.prepare(MOUNT).run(vat, json);
		db.prepare(MOUNT_LABELS).run(vat, json);
	};
	const lookup = (request) => db.prepare(LOOKUP).get(JSON.stringify(request))?.vat ?? null;
	const overlaps = (vat, labels) => !!db.prepare(OVERLAP).get(JSON.stringify(labels), vat);
	return { db, mount, lookup, overlaps };
};

test("a request reaches the mount whose every label it carries", () => {
	const { mount, lookup } = makeDb();
	mount("a", { vat: "alice", key: "s3cret" });
	mount("b", { vat: "bob" });
	assert.equal(lookup({ vat: "alice", key: "s3cret", page: "2" }), "a");
	assert.equal(lookup({ vat: "alice" }), null);
	assert.equal(lookup({ vat: "alice", key: "wrong" }), null);
	assert.equal(lookup({ vat: "bob" }), "b");
	assert.equal(lookup({}), null);
});

test("a mount with no labels matches any request", () => {
	const { mount, lookup } = makeDb();
	mount("only", {});
	assert.equal(lookup({ anything: "x" }), "only");
});

test("overlap: a mount must conflict with every other", () => {
	const { mount, overlaps } = makeDb();
	mount("a", { vat: "alice" });
	assert.equal(overlaps("b", { vat: "alice", n: "2" }), true);
	assert.equal(overlaps("b", { app: "x" }), true);
	assert.equal(overlaps("b", { vat: "bob" }), false);
	assert.equal(overlaps("a", { vat: "alice", n: "2" }), false, "a vat's own mount doesn't count");
});

test("mounts stored before mount_label are filled in when the schema runs", () => {
	const db = new DatabaseSync(":memory:");
	db.exec("CREATE TABLE mount (vat TEXT PRIMARY KEY, labels TEXT)");
	db.prepare("INSERT INTO mount VALUES (?, ?)").run("old", JSON.stringify({ vat: "old" }));
	for (const statement of MOUNT_SCHEMA) db.exec(statement);
	assert.equal(db.prepare(LOOKUP).get(JSON.stringify({ vat: "old" }))?.vat, "old");
	assert.equal(db.prepare(LOOKUP).get(JSON.stringify({ vat: "other" })), undefined);
});