import { afterEach, describe, expect, it, vi } from 'vitest';
import http from 'node:http';
import type { AddressInfo } from 'node:net';
import { WebSocket } from '@snowluma/websocket';
import { HttpServerAdapter } from '../src/network/http-server-adapter';
import { NetworkReloadType, type NetworkAdapterContext } from '../src/network/adapter';
import type { HttpServerNetwork, JsonObject } from '../src/types';

interface HttpResult {
    status: number;
}

function requestHttp(port: number, token: string): Promise<HttpResult> {
    return new Promise((resolve, reject) => {
        const request = http.request(
            {
                hostname: '127.0.0.1',
                port,
                path: '/',
                method: 'GET',
                headers: { authorization: `Bearer ${token}` },
            },
            (response) => {
                response.resume();
                response.once('end', () => resolve({ status: response.statusCode ?? 0 }));
            },
        );
        request.once('error', reject);
        request.end();
    });
}

function waitForOpen(socket: WebSocket): Promise<void> {
    return new Promise((resolve, reject) => {
        socket.once('open', resolve);
        socket.once('error', reject);
    });
}

function waitForHandshakeError(socket: WebSocket): Promise<string> {
    return new Promise((resolve, reject) => {
        socket.once('open', () =>
            reject(new Error('unauthorized WebSocket completed the upgrade')),
        );
        socket.once('error', (error: Error) => resolve(error.message));
    });
}

function waitForMessage(socket: WebSocket): Promise<JsonObject> {
    return new Promise((resolve, reject) => {
        socket.once('message', (raw: Buffer) => {
            try {
                resolve(JSON.parse(raw.toString('utf8')) as JsonObject);
            } catch (error) {
                reject(error);
            }
        });
        socket.once('error', reject);
    });
}

function waitForClose(socket: WebSocket): Promise<{ code: number; reason: string }> {
    return new Promise((resolve) => {
        socket.once('close', (code: number, reason: string) => resolve({ code, reason }));
    });
}

function context(): NetworkAdapterContext {
    return {
        uin: '10001',
        api: {
            isAcceptingActions: true,
            handle: vi.fn(async () => ({
                status: 'ok',
                retcode: 0,
                data: { transport: 'http' },
            })),
            isStreamAction: vi.fn(() => false),
            processStreamRequest: vi.fn(
                async (text: string, send: (frame: string) => Promise<void>) => {
                    const request = JSON.parse(text) as { echo?: unknown };
                    await send(
                        JSON.stringify({
                            status: 'ok',
                            retcode: 0,
                            data: { transport: 'websocket' },
                            echo: request.echo,
                        }),
                    );
                },
            ),
        } as never,
        buildLifecycleEvent: (subType) => ({
            post_type: 'meta_event',
            meta_event_type: 'lifecycle',
            sub_type: subType,
        }),
        buildHeartbeatEvent: () => ({
            post_type: 'meta_event',
            meta_event_type: 'heartbeat',
            interval: 5000,
        }),
    };
}

describe('HttpServerAdapter — optional WebSocket transport', () => {
    let adapter: HttpServerAdapter | null = null;
    let socket: WebSocket | null = null;

    afterEach(async () => {
        await adapter?.close();
        adapter = null;
        socket?.terminate();
        socket = null;
    });

    it('serves HTTP and WebSocket actions on the same listener', async () => {
        const token = 'same-listener-token';
        const config = {
            name: 'combined',
            host: '127.0.0.1',
            port: 0,
            path: '/',
            enabled: true,
            enableWebSocket: true,
            accessToken: token,
            messageFormat: 'array',
            reportSelfMessage: false,
        } satisfies HttpServerNetwork & { enableWebSocket: boolean };
        adapter = new HttpServerAdapter(config.name, config, context());
        await adapter.open();

        const address = (
            adapter as unknown as { server: http.Server }
        ).server.address() as AddressInfo;
        expect((await requestHttp(address.port, token)).status).toBe(200);

        socket = new WebSocket(`ws://127.0.0.1:${String(address.port)}/api?access_token=${token}`);
        await waitForOpen(socket);
        const response = waitForMessage(socket);
        socket.send(JSON.stringify({ action: 'get_status', params: {}, echo: 'same-port' }));

        await expect(response).resolves.toMatchObject({
            status: 'ok',
            retcode: 0,
            data: { transport: 'websocket' },
            echo: 'same-port',
        });
    });

    it('rejects an invalid WebSocket token before completing the HTTP upgrade', async () => {
        const config = {
            name: 'pre-upgrade-auth',
            host: '127.0.0.1',
            port: 0,
            path: '/',
            enabled: true,
            enableWebSocket: true,
            accessToken: 'expected-token',
            messageFormat: 'array',
            reportSelfMessage: false,
        } satisfies HttpServerNetwork & { enableWebSocket: boolean };
        adapter = new HttpServerAdapter(config.name, config, context());
        await adapter.open();

        const address = (
            adapter as unknown as { server: http.Server }
        ).server.address() as AddressInfo;
        socket = new WebSocket(
            `ws://127.0.0.1:${String(address.port)}/api?access_token=wrong-token`,
        );

        await expect(waitForHandshakeError(socket)).resolves.toContain(
            'Unexpected response status 401',
        );
        expect(adapter.describeStatus().detail).toBe('监听中 · WebSocket 0 个客户端');
    });

    it('records and drops a valid WebSocket action after API quiesce', async () => {
        const ctx = context();
        const api = ctx.api as unknown as {
            isAcceptingActions: boolean;
            processStreamRequest: ReturnType<typeof vi.fn>;
            traceQuiescedStreamRequest: ReturnType<typeof vi.fn>;
        };
        api.traceQuiescedStreamRequest = vi.fn();
        const config = {
            name: 'quiesced-websocket',
            host: '127.0.0.1',
            port: 0,
            path: '/',
            enabled: true,
            enableWebSocket: true,
            messageFormat: 'array',
            reportSelfMessage: false,
        } satisfies HttpServerNetwork;
        adapter = new HttpServerAdapter(config.name, config, ctx);
        await adapter.open();
        const address = (
            adapter as unknown as { server: http.Server }
        ).server.address() as AddressInfo;
        socket = new WebSocket(`ws://127.0.0.1:${String(address.port)}/api`);
        await waitForOpen(socket);
        const received = vi.fn();
        socket.on('message', received);
        api.isAcceptingActions = false;
        const raw = JSON.stringify({
            action: 'get_status',
            params: { detail: 'complete' },
            echo: 'dropped',
        });

        socket.send(raw);

        await vi.waitFor(() => {
            expect(api.traceQuiescedStreamRequest).toHaveBeenCalledWith(raw);
        });
        await new Promise((resolve) => setImmediate(resolve));
        expect(api.processStreamRequest).not.toHaveBeenCalled();
        expect(received).not.toHaveBeenCalled();
    });

    it('disconnects authenticated sockets when the shared token changes without rebinding HTTP', async () => {
        const config = {
            name: 'rotating-token',
            host: '127.0.0.1',
            port: 0,
            path: '/',
            enabled: true,
            enableWebSocket: true,
            accessToken: 'token-before',
            messageFormat: 'array',
            reportSelfMessage: false,
        } satisfies HttpServerNetwork;
        adapter = new HttpServerAdapter(config.name, config, context());
        await adapter.open();
        const addressBefore = (
            adapter as unknown as { server: http.Server }
        ).server.address() as AddressInfo;

        socket = new WebSocket(
            `ws://127.0.0.1:${String(addressBefore.port)}/api?access_token=${config.accessToken}`,
        );
        await waitForOpen(socket);
        const oldSocketClosed = waitForClose(socket);

        const reloadType = await adapter.reload({ ...config, accessToken: 'token-after' });
        expect(reloadType).toBe(NetworkReloadType.Normal);
        await expect(oldSocketClosed).resolves.toMatchObject({
            code: 1008,
            reason: 'access token changed',
        });

        const addressAfter = (
            adapter as unknown as { server: http.Server }
        ).server.address() as AddressInfo;
        expect(addressAfter.port).toBe(addressBefore.port);

        socket = new WebSocket(
            `ws://127.0.0.1:${String(addressAfter.port)}/api?access_token=token-after`,
        );
        await waitForOpen(socket);
        const response = waitForMessage(socket);
        socket.send(JSON.stringify({ action: 'get_status', params: {}, echo: 'new-token' }));
        await expect(response).resolves.toMatchObject({
            status: 'ok',
            retcode: 0,
            echo: 'new-token',
        });
    });

    it('reopens the listener when the WebSocket switch changes', async () => {
        const config = {
            name: 'toggle',
            host: '127.0.0.1',
            port: 0,
            path: '/',
            enabled: true,
            enableWebSocket: false,
            accessToken: 'toggle-token',
            messageFormat: 'array',
            reportSelfMessage: false,
        } satisfies HttpServerNetwork;
        adapter = new HttpServerAdapter(config.name, config, context());
        await adapter.open();

        expect(adapter.describeStatus().detail).toBe('监听中');
        expect(await adapter.reload({ ...config, enableWebSocket: true })).toBe(
            NetworkReloadType.Reopened,
        );

        const enabledAddress = (
            adapter as unknown as { server: http.Server }
        ).server.address() as AddressInfo;
        socket = new WebSocket(
            `ws://127.0.0.1:${String(enabledAddress.port)}/api?access_token=${config.accessToken}`,
        );
        await waitForOpen(socket);
        expect(adapter.describeStatus().detail).toBe('监听中 · WebSocket 1 个客户端');
        const socketClosed = waitForClose(socket);

        expect(await adapter.reload({ ...config, enableWebSocket: false })).toBe(
            NetworkReloadType.Reopened,
        );
        await expect(socketClosed).resolves.toMatchObject({ code: 1000 });

        const disabledAddress = (
            adapter as unknown as { server: http.Server }
        ).server.address() as AddressInfo;
        expect((await requestHttp(disabledAddress.port, config.accessToken)).status).toBe(200);
        expect(adapter.describeStatus().detail).toBe('监听中');
    });

    it('waits for an accepted WebSocket action before releasing the shared listener', async () => {
        let actionStarted!: () => void;
        const started = new Promise<void>((resolve) => {
            actionStarted = resolve;
        });
        let finishAction!: () => void;
        const actionGate = new Promise<void>((resolve) => {
            finishAction = resolve;
        });
        const ctx = context();

        (
            ctx.api as unknown as {
                processStreamRequest: (
                    text: string,
                    send: (frame: string) => Promise<void>,
                ) => Promise<void>;
            }
        ).processStreamRequest = async () => {
            actionStarted();
            await actionGate;
        };

        const config = {
            name: 'action-drain',
            host: '127.0.0.1',
            port: 0,
            path: '/',
            enabled: true,
            enableWebSocket: true,
            accessToken: 'drain-token',
            messageFormat: 'array',
            reportSelfMessage: false,
        } satisfies HttpServerNetwork;
        adapter = new HttpServerAdapter(config.name, config, ctx);
        await adapter.open();
        const address = (
            adapter as unknown as { server: http.Server }
        ).server.address() as AddressInfo;
        socket = new WebSocket(
            `ws://127.0.0.1:${String(address.port)}/api?access_token=${config.accessToken}`,
        );
        await waitForOpen(socket);
        socket.send(JSON.stringify({ action: 'slow_action', params: {} }));
        await started;

        let closed = false;
        const closing = adapter.close().then(() => {
            closed = true;
        });
        await new Promise((resolve) => setImmediate(resolve));
        expect(closed).toBe(false);

        finishAction();
        await closing;
        expect(closed).toBe(true);
        adapter = null;
    });
});