/**
 * Lifecycle and option-validation tests for `HttpsTransport`.
 */

import { describe, expect, it } from "@suaveplan/testing/runner";
import {
    HTTPS_TRANSPORT_CODES,
    HttpsTransport,
    type HttpsTransportError,
} from "../src/index.js";
import { jsonResponse, makeFakeFetch } from "./_helpers.js";

const RELAY = "https://relay.test";

describe("HttpsTransport — lifecycle", () => {
    it("constructor rejects an invalid relayUrl", { timeout: 5000 }, () => {
        expect(
            () =>
                new HttpsTransport({
                    relayUrl: "not-a-url",
                    ourPeerId: "peer-a",
                })
        ).toThrow();
    });

    it("constructor rejects empty ourPeerId", { timeout: 5000 }, () => {
        expect(
            () =>
                new HttpsTransport({
                    relayUrl: RELAY,
                    ourPeerId: "",
                })
        ).toThrow();
    });

    it("constructor rejects backoffBaseMs > backoffMaxMs", {
        timeout: 5000,
    }, () => {
        expect(
            () =>
                new HttpsTransport({
                    relayUrl: RELAY,
                    ourPeerId: "peer-a",
                    backoffBaseMs: 1000,
                    backoffMaxMs: 100,
                })
        ).toThrow();
    });

    it("start is idempotent while running", { timeout: 5000 }, async () => {
        const fetchFn = makeFakeFetch({
            responder: () => jsonResponse({ envelopes: [], nextCursor: "0" }),
        });
        const t = new HttpsTransport({
            relayUrl: RELAY,
            ourPeerId: "peer-a",
            fetchFn,
            longPollTimeoutMs: 50,
            pollIdleDelayMs: 5,
        });
        t.start();
        t.start();
        expect(t.state).toBe("running");
        await t.stop();
    });

    it("start after stop throws CLOSED", { timeout: 5000 }, async () => {
        const fetchFn = makeFakeFetch({
            responder: () => jsonResponse({ envelopes: [], nextCursor: "0" }),
        });
        const t = new HttpsTransport({
            relayUrl: RELAY,
            ourPeerId: "peer-a",
            fetchFn,
        });
        t.start();
        await t.stop();
        try {
            t.start();
            throw new Error("expected CLOSED");
        } catch (err) {
            expect((err as HttpsTransportError).code).toBe(
                HTTPS_TRANSPORT_CODES.CLOSED
            );
        }
    });

    it("stop is idempotent", { timeout: 5000 }, async () => {
        const fetchFn = makeFakeFetch({
            responder: () => jsonResponse({ envelopes: [], nextCursor: "0" }),
        });
        const t = new HttpsTransport({
            relayUrl: RELAY,
            ourPeerId: "peer-a",
            fetchFn,
        });
        t.start();
        await t.stop();
        await t.stop();
        expect(t.state).toBe("stopped");
    });

    it("stop before start does not throw", { timeout: 5000 }, async () => {
        const fetchFn = makeFakeFetch({
            responder: () => jsonResponse({ envelopes: [], nextCursor: "0" }),
        });
        const t = new HttpsTransport({
            relayUrl: RELAY,
            ourPeerId: "peer-a",
            fetchFn,
        });
        await t.stop();
        expect(t.state).toBe("stopped");
    });

    it("connect/disconnect track peers and getConnectedPeers reports them", {
        timeout: 5000,
    }, async () => {
        const fetchFn = makeFakeFetch({
            responder: () => jsonResponse({ envelopes: [], nextCursor: "0" }),
        });
        const t = new HttpsTransport({
            relayUrl: RELAY,
            ourPeerId: "peer-a",
            fetchFn,
            longPollTimeoutMs: 50,
            pollIdleDelayMs: 5,
        });
        t.start();
        await t.connect("peer-b", "ignored");
        await t.connect("peer-c", "ignored");
        expect(t.getConnectedPeers()).toEqual(["peer-b", "peer-c"]);
        await t.disconnect("peer-b");
        expect(t.getConnectedPeers()).toEqual(["peer-c"]);
        // disconnect on an unknown peer is a no-op
        await t.disconnect("peer-x");
        expect(t.getConnectedPeers()).toEqual(["peer-c"]);
        await t.stop();
    });

    it("connect before start throws NOT_CONNECTED", {
        timeout: 5000,
    }, async () => {
        const fetchFn = makeFakeFetch({
            responder: () => jsonResponse({ ok: true }),
        });
        const t = new HttpsTransport({
            relayUrl: RELAY,
            ourPeerId: "peer-a",
            fetchFn,
        });
        await expect(t.connect("peer-b", "x")).rejects.toMatchObject({
            code: HTTPS_TRANSPORT_CODES.NOT_CONNECTED,
        });
    });

    it("cursor starts empty and updates after a successful /recv", {
        timeout: 5000,
    }, async () => {
        let recvCalls = 0;
        const fetchFn = makeFakeFetch({
            responder: (call) => {
                if (call.url.includes("/recv")) {
                    recvCalls++;
                    return jsonResponse({
                        envelopes: [],
                        nextCursor: "c-1",
                    });
                }
                return jsonResponse({ ok: true });
            },
        });
        const t = new HttpsTransport({
            relayUrl: RELAY,
            ourPeerId: "peer-a",
            fetchFn,
            longPollTimeoutMs: 25,
            pollIdleDelayMs: 5,
        });
        expect(t.cursor).toBe("");
        expect(t.state).toBe("idle");
        t.start();
        // Wait for at least one successful recv cycle to complete.
        const start = Date.now();
        while (t.cursor === "" && Date.now() - start < 2000) {
            await new Promise<void>((r) => setTimeout(r, 5));
        }
        expect(t.cursor).toBe("c-1");
        expect(recvCalls).toBeGreaterThan(0);
        await t.stop();
    });

    it("clears handlers and peers on stop", { timeout: 5000 }, async () => {
        const fetchFn = makeFakeFetch({
            responder: () => jsonResponse({ envelopes: [], nextCursor: "0" }),
        });
        const t = new HttpsTransport({
            relayUrl: RELAY,
            ourPeerId: "peer-a",
            fetchFn,
            longPollTimeoutMs: 25,
        });
        t.start();
        await t.connect("peer-b", "x");
        const off = t.onMessage(() => undefined);
        await t.stop();
        expect(t.getConnectedPeers()).toEqual([]);
        // Calling unsubscribe after stop is a no-op (set already cleared).
        off();
    });
});