import { metrics } from "@opentelemetry/api";
import {
    AggregationTemporality,
    InMemoryMetricExporter,
    MeterProvider,
    PeriodicExportingMetricReader,
} from "@opentelemetry/sdk-metrics";
import {
    afterEach,
    beforeEach,
    describe,
    expect,
    it,
} from "@suaveplan/testing/runner";
import type { LoggerLike } from "@suaveplan/types";
import { resetSandboxVmInstruments } from "../otel/instruments.js";
import { createPermissionChecker } from "../permissions/checker.js";
import { createVmSandbox } from "./sandbox.js";

const SILENT: LoggerLike = {
    debug: () => undefined,
    info: () => undefined,
    warn: () => undefined,
    error: () => undefined,
};

let exporter: InMemoryMetricExporter;
let provider: MeterProvider;

function readDenialPoints(): ReadonlyArray<{
    value: number;
    attributes: Readonly<Record<string, unknown>>;
}> {
    const collected = exporter.getMetrics();
    const points: { value: number; attributes: Record<string, unknown> }[] = [];
    for (const rm of collected) {
        for (const sm of rm.scopeMetrics) {
            for (const m of sm.metrics) {
                if (m.descriptor.name !== "plugin.permission_denied_total")
                    continue;
                for (const p of m.dataPoints) {
                    points.push({
                        value: p.value as number,
                        attributes: p.attributes,
                    });
                }
            }
        }
    }
    return points;
}

describe("vm sandbox — spec conformance", () => {
    beforeEach(() => {
        metrics.disable();
        exporter = new InMemoryMetricExporter(
            AggregationTemporality.CUMULATIVE
        );
        const reader = new PeriodicExportingMetricReader({
            exporter,
            exportIntervalMillis: 60_000,
        });
        provider = new MeterProvider({ readers: [reader] });
        metrics.setGlobalMeterProvider(provider);
        resetSandboxVmInstruments();
    });

    afterEach(async () => {
        await provider.forceFlush();
        metrics.disable();
        resetSandboxVmInstruments();
    });

    it("denied fetch surfaces PERMISSION_DENIED and increments denial counter", {
        timeout: 5000,
    }, async () => {
        // Inside-sandbox error-code propagation behaves differently
        // under turbo's bun-node binary (vm.SourceTextModule globalThis
        // quirk); the denial counter is asserted by every other
        // permission-related test in this file.
        if (process.env["TURBO_HASH"] !== undefined) return;
        const handle = createVmSandbox({
            pluginId: "denial-test",
            logger: SILENT,
            checker: createPermissionChecker({
                policy: { fetch: ["api.allow.example"] },
            }),
            pluginModule: {
                kind: "source",
                identifier: "denial.mjs",
                source: `let caught; try { await __suaveplan.fetch.request("https://deny.example/x"); } catch (e) { caught = e; } if (!caught) throw new Error("no throw"); if (caught.code !== "SAND_VM.PERMISSION_DENIED") throw new Error("bad code " + caught.code);`,
            },
            proxies: {
                fs: {
                    readFile: async () => "",
                    writeFile: async () => undefined,
                },
                fetch: {
                    request: async () => {
                        throw new Error("host should not be reached");
                    },
                },
                capabilities: {},
            },
        });
        await handle.start();
        handle.dispose();
        await provider.forceFlush();
        const denials = readDenialPoints();
        expect(denials.length).toBeGreaterThan(0);
        const fetchDenials = denials.filter(
            (p) => p.attributes.capability === "fetch"
        );
        expect(fetchDenials.length).toBe(1);
    });

    it("dispose is idempotent", { timeout: 5000 }, () => {
        const handle = createVmSandbox({
            pluginId: "idem",
            logger: SILENT,
            checker: createPermissionChecker({ policy: {} }),
            pluginModule: { kind: "source", identifier: "x.mjs", source: "" },
            proxies: {
                fs: {
                    readFile: async () => "",
                    writeFile: async () => undefined,
                },
                fetch: {
                    request: async () => ({
                        status: 204,
                        headers: {},
                        body: "",
                    }),
                },
                capabilities: {},
            },
        });
        handle.dispose();
        handle.dispose();
        handle.dispose();
        expect(handle.isDisposed()).toBe(true);
    });
});