import { beforeEach, describe, expect, it, vi } from 'vitest';

const { FakeWebSocketServer, servers } = vi.hoisted(() => {
    // eslint-disable-next-line @typescript-eslint/no-require-imports
    const { EventEmitter } = require('node:events') as typeof import('node:events');
    const servers: FakeWebSocketServer[] = [];

    class FakeWebSocketServer extends EventEmitter {
        closeCallback: ((error?: Error) => void) | null = null;
        readonly options: {
            verifyClient?: (
                info: { req: { headers: Record<string, string>; url?: string } },
                done: (allow: boolean, code?: number, message?: string) => void,
            ) => void;
        };
        constructor(options: unknown) {
            super();
            this.options = options as typeof this.options;
            servers.push(this);
        }
        close(callback?: (error?: Error) => void): void {
            this.closeCallback = callback ?? null;
        }
        finishClose(error?: Error): void {
            this.closeCallback?.(error);
        }
    }

    return { FakeWebSocketServer, servers };
});

vi.mock('@snowluma/websocket', () => ({
    WebSocket: class {},
    WebSocketServer: FakeWebSocketServer,
}));

import { WsServerAdapter } from '../src/network/ws-server-adapter';
import type { NetworkAdapterContext } from '../src/network/adapter';
import type { WsServerNetwork } from '../src/types';

let apiAccepting = true;
const CTX: NetworkAdapterContext = {
    uin: '10001',
    api: {
        get isAcceptingActions() {
            return apiAccepting;
        },
    } as never,
    buildLifecycleEvent: () => ({}),
    buildHeartbeatEvent: () => ({}),
};

function config(): WsServerNetwork {
    return {
        name: 'ws',
        host: '127.0.0.1',
        port: 8080,
        path: '/',
        role: 'Universal',
        messageFormat: 'array',
        reportSelfMessage: false,
    };
}

describe('WsServerAdapter bind/release lifecycle promises', () => {
    beforeEach(() => {
        servers.length = 0;
        apiAccepting = true;
    });

    it('does not resolve open before the listening event', async () => {
        const adapter = new WsServerAdapter('ws', config(), CTX);
        let resolved = false;
        const opening = adapter.open().then(() => {
            resolved = true;
        });
        await Promise.resolve();
        expect(resolved).toBe(false);
        expect(adapter.describeStatus().status).toBe('disabled');

        servers[0].emit('listening');
        await opening;
        expect(resolved).toBe(true);
        expect(adapter.describeStatus().status).toBe('ok');
    });

    it('provides standalone upgrade authentication before accepting a connection', () => {
        const adapter = new WsServerAdapter(
            'ws',
            {
                ...config(),
                accessToken: 'expected-token',
            },
            CTX,
        );
        void adapter.open();
        const verify = servers[0].options.verifyClient;

        expect(verify).toBeTypeOf('function');
        const denied = vi.fn();
        verify?.({ req: { headers: {}, url: '/?access_token=wrong-token' } }, denied);
        expect(denied).toHaveBeenCalledWith(false, 401, 'Unauthorized');

        const accepted = vi.fn();
        verify?.({ req: { headers: {}, url: '/?access_token=expected-token' } }, accepted);
        expect(accepted).toHaveBeenCalledWith(true);
    });

    it('rejects bind errors and exposes them as degraded', async () => {
        const adapter = new WsServerAdapter('ws', config(), CTX);
        const opening = adapter.open();
        servers[0].emit(
            'error',
            Object.assign(new Error('address in use'), { code: 'EADDRINUSE' }),
        );

        await expect(opening).rejects.toMatchObject({ code: 'EADDRINUSE' });
        expect(adapter.describeManagedStatus()).toMatchObject({
            status: 'degraded',
            lastError: 'address in use',
        });
    });

    it('does not resolve close before the server release callback', async () => {
        const adapter = new WsServerAdapter('ws', config(), CTX);
        const opening = adapter.open();
        servers[0].emit('listening');
        await opening;

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

        servers[0].finishClose();
        await closing;
        expect(resolved).toBe(true);
        expect(adapter.describeStatus().status).toBe('disabled');
    });

    it('retains server ownership after close callback failure and retries it', async () => {
        const adapter = new WsServerAdapter('ws', config(), CTX);
        const opening = adapter.open();
        servers[0].emit('listening');
        await opening;

        const firstClose = adapter.close();
        servers[0].finishClose(new Error('release failed'));
        await expect(firstClose).rejects.toThrow('release failed');
        expect((adapter as unknown as { wss: unknown }).wss).toBe(servers[0]);
        expect(adapter.describeStatus().status).toBe('ok');

        // The ambiguous transport failure restores its local live-state, but a
        // final instance shutdown has a sticky ApiHandler gate and must not admit
        // a new Action through the retiring generation.
        expect((adapter as unknown as { acceptingActions: boolean }).acceptingActions).toBe(true);
        apiAccepting = false;
        const startAction = vi.fn(async () => {});
        (
            adapter as unknown as { trackInboundAction(start: () => Promise<void>): void }
        ).trackInboundAction(startAction);
        expect(startAction).not.toHaveBeenCalled();

        const secondClose = adapter.close();
        servers[0].finishClose();
        await secondClose;
        expect((adapter as unknown as { wss: unknown }).wss).toBeNull();
        expect(adapter.describeStatus().status).toBe('disabled');
    });

    it('releases the listener but waits for an in-flight inbound action to drain', async () => {
        const adapter = new WsServerAdapter('ws', config(), CTX);
        const opening = adapter.open();
        servers[0].emit('listening');
        await opening;
        let finishAction!: () => void;
        const actionGate = new Promise<void>((resolve) => {
            finishAction = resolve;
        });
        (
            adapter as unknown as { trackInboundAction(start: () => Promise<void>): void }
        ).trackInboundAction(() => actionGate);

        let closed = false;
        const closing = adapter.close().then(() => {
            closed = true;
        });
        servers[0].finishClose();
        await Promise.resolve();
        expect(closed).toBe(false);

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