// Phase-0 safety net for the bootstrap-meta deepening: characterize the
// CURRENT observable behavior the refactor must preserve —
//   1. event-filter `shapeEventForAdapter` shaping rules (the policy that
//      the lifted `metaFrame` primitive will wrap),
//   2. ws-client emits exactly [connect, enable, heartbeat] on socket open,
//      shaped per options, honoring the role guard,
//   3. ws-server emits the same triplet to an Event connection, and on
//      close() broadcasts a single `disable` lifecycle to non-Api conns.
//
// Mirrors ws-client-stale-close.test.ts: `@snowluma/websocket`'s native
// addon isn't built in a plain checkout, so WebSocket + WebSocketServer are
// faked via vi.hoisted + vi.mock and driven explicitly.

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

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

    class FakeWebSocket extends EventEmitter {
        public readyState = 1; // OPEN
        public readonly sent: string[] = [];
        public readonly url: string;
        constructor(url = '', _opts?: unknown) {
            super();
            this.url = url;
            clientInstances.push(this);
        }
        send(payload: string, cb?: (err?: Error | null) => void): void {
            this.sent.push(payload);
            cb?.(null);
        }
        close(): void {
            this.readyState = 3;
        }
        simulateOpen(): void {
            this.emit('open');
        }
    }

    class FakeWebSocketServer extends EventEmitter {
        public closed = false;
        constructor(_opts: unknown) {
            super();
            servers.push(this);
        }
        close(): void {
            this.closed = true;
        }
        /** Drive a client connection through the adapter's 'connection' handler. */
        simulateConnection(socket: FakeWebSocket, request: unknown): void {
            this.emit('connection', socket, request);
        }
    }

    return { FakeWebSocket, FakeWebSocketServer, clientInstances, servers };
});

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

import { shapeEventForAdapter, resolveReportOptions } from '../src/event-filter';
import { WsClientAdapter } from '../src/network/ws-client-adapter';
import { WsServerAdapter } from '../src/network/ws-server-adapter';
import type { NetworkAdapterContext } from '../src/network/adapter';
import type { JsonObject, WsClientNetwork, WsServerNetwork } from '../src/types';

// Distinguishable meta events so the bootstrap triplet is identifiable on the
// wire (the real ctx builds real OneBot meta_event objects).
function ctx(): NetworkAdapterContext {
    return {
        uin: '10001',
        api: { processStreamRequest: async () => {} } as never,
        buildLifecycleEvent: (sub) => ({
            post_type: 'meta_event',
            meta_event_type: 'lifecycle',
            sub_type: sub,
        }),
        buildHeartbeatEvent: () => ({
            post_type: 'meta_event',
            meta_event_type: 'heartbeat',
            interval: 5000,
        }),
    };
}

const parse = (s: string) => JSON.parse(s) as JsonObject;

describe('event-filter shapeEventForAdapter — shaping policy (characterization)', () => {
    const arrayOpts = resolveReportOptions({ messageFormat: 'array', reportSelfMessage: false });
    const stringOpts = resolveReportOptions({ messageFormat: 'string', reportSelfMessage: false });
    const selfOpts = resolveReportOptions({ messageFormat: 'array', reportSelfMessage: true });

    it('passes meta_event (and any non-message) through unchanged', () => {
        const meta = { post_type: 'meta_event', meta_event_type: 'heartbeat' } as JsonObject;
        expect(shapeEventForAdapter(meta, arrayOpts)).toEqual(meta);
        expect(shapeEventForAdapter(meta, stringOpts)).toEqual(meta);
    });

    it('drops message_sent when reportSelfMessage is false, keeps it when true', () => {
        const sent = {
            post_type: 'message_sent',
            message: [{ type: 'text', data: { text: 'hi' } }],
            raw_message: 'hi',
        } as JsonObject;
        expect(shapeEventForAdapter(sent, arrayOpts)).toBeNull();
        expect(shapeEventForAdapter(sent, selfOpts)).toEqual(sent);
    });

    it('string format collapses an array message to its raw_message', () => {
        const msg = {
            post_type: 'message',
            message: [{ type: 'text', data: { text: 'hi' } }],
            raw_message: 'hi',
        } as JsonObject;
        expect(shapeEventForAdapter(msg, arrayOpts)).toEqual(msg); // untouched in array mode
        const shaped = shapeEventForAdapter(msg, stringOpts);
        expect(shaped?.message).toBe('hi'); // array → raw string
    });
});

describe('WsClientAdapter — bootstrap meta on open (characterization)', () => {
    beforeEach(() => {
        clientInstances.length = 0;
    });

    function cfg(over: Partial<WsClientNetwork> = {}): WsClientNetwork {
        return {
            enabled: true,
            url: 'ws://127.0.0.1:8080/',
            role: 'Universal',
            reconnectIntervalMs: 1000,
            ...over,
        } as WsClientNetwork;
    }

    it('sends exactly [connect, enable, heartbeat] when the socket opens', () => {
        const adapter = new WsClientAdapter('ws', cfg(), ctx());
        adapter.open();
        clientInstances[0].simulateOpen();

        const frames = clientInstances[0].sent.map(parse);
        expect(frames).toEqual([
            { post_type: 'meta_event', meta_event_type: 'lifecycle', sub_type: 'connect' },
            { post_type: 'meta_event', meta_event_type: 'lifecycle', sub_type: 'enable' },
            { post_type: 'meta_event', meta_event_type: 'heartbeat', interval: 5000 },
        ]);
    });

    it('does NOT send bootstrap when role is Api-only', () => {
        const adapter = new WsClientAdapter('ws', cfg({ role: 'Api' }), ctx());
        adapter.open();
        clientInstances[0].simulateOpen();
        expect(clientInstances[0].sent).toEqual([]);
    });

    it('drops a bootstrap frame that shapes to null, and threads options through the shaper', () => {
        // Force the heartbeat to shape to null when reportSelfMessage is false by
        // making it a message_sent event. This pins TWO invariants the lift must
        // keep: (1) a frame whose shape returns null is skipped, (2) the adapter's
        // options actually reach shapeEventForAdapter (else the drop wouldn't be
        // conditional on reportSelfMessage).
        const selfMsgHeartbeatCtx = (): NetworkAdapterContext => ({
            ...ctx(),
            buildHeartbeatEvent: () => ({
                post_type: 'message_sent',
                message: [{ type: 'text', data: { text: 'x' } }],
                raw_message: 'x',
            }),
        });

        const dropper = new WsClientAdapter(
            'ws',
            cfg({ reportSelfMessage: false }),
            selfMsgHeartbeatCtx(),
        );
        dropper.open();
        clientInstances.at(-1)!.simulateOpen();
        expect(
            clientInstances
                .at(-1)!
                .sent.map(parse)
                .map((f) => f.sub_type),
        ).toEqual(['connect', 'enable']);

        clientInstances.length = 0;
        const keeper = new WsClientAdapter(
            'ws',
            cfg({ reportSelfMessage: true }),
            selfMsgHeartbeatCtx(),
        );
        keeper.open();
        clientInstances.at(-1)!.simulateOpen();
        expect(clientInstances.at(-1)!.sent).toHaveLength(3); // kept when self-reporting → options threaded
    });
});

describe('WsServerAdapter — bootstrap on connect + disable on close (characterization)', () => {
    beforeEach(() => {
        servers.length = 0;
        clientInstances.length = 0;
    });

    function cfg(over: Partial<WsServerNetwork> = {}): WsServerNetwork {
        return {
            enabled: true,
            host: '127.0.0.1',
            port: 8080,
            path: '/',
            role: 'Event',
            accessToken: '',
            ...over,
        } as WsServerNetwork;
    }

    const req = { headers: {}, url: '/' };

    it('sends the bootstrap triplet to a new Event connection', () => {
        const adapter = new WsServerAdapter('wss', cfg(), ctx());
        adapter.open();
        servers[0].emit('listening');
        const sock = new FakeWebSocket();
        servers[0].simulateConnection(sock, req);

        const frames = sock.sent.map(parse);
        expect(frames.map((f) => f.meta_event_type)).toEqual([
            'lifecycle',
            'lifecycle',
            'heartbeat',
        ]);
        expect(frames.map((f) => f.sub_type)).toEqual(['connect', 'enable', undefined]);
    });

    it('broadcasts a single disable lifecycle to connected event clients on close()', () => {
        const adapter = new WsServerAdapter('wss', cfg(), ctx());
        adapter.open();
        servers[0].emit('listening');
        const sock = new FakeWebSocket();
        servers[0].simulateConnection(sock, req);
        sock.sent.length = 0; // drop the bootstrap frames; we only care about close

        adapter.close();

        const frames = sock.sent.map(parse);
        expect(frames).toEqual([
            { post_type: 'meta_event', meta_event_type: 'lifecycle', sub_type: 'disable' },
        ]);
    });

    it('skips Api connections for both bootstrap and the close disable broadcast', () => {
        // Role is classified per request path (no fixed config.role): /event → Event,
        // /api → Api. Pins that Api conns receive neither the bootstrap triplet nor
        // the disable broadcast — the close()-side Api guard the lift reroutes.
        const adapter = new WsServerAdapter('wss', cfg({ role: undefined }), ctx());
        adapter.open();
        servers[0].emit('listening');
        const eventSock = new FakeWebSocket();
        const apiSock = new FakeWebSocket();
        servers[0].simulateConnection(eventSock, { headers: {}, url: '/event' });
        servers[0].simulateConnection(apiSock, { headers: {}, url: '/api' });

        expect(apiSock.sent).toEqual([]); // Api gets no bootstrap
        expect(eventSock.sent).toHaveLength(3); // Event gets the triplet
        eventSock.sent.length = 0;

        adapter.close();

        expect(apiSock.sent).toEqual([]); // Api skipped on close too
        expect(eventSock.sent.map(parse)).toEqual([
            { post_type: 'meta_event', meta_event_type: 'lifecycle', sub_type: 'disable' },
        ]);
    });
});