import { describe, expect, it } from 'vitest';
import {
    getLogLevel,
    runWithRequestId,
    setLogLevel,
    subscribeLogs,
    type LogEntry,
} from '@snowluma/common/logger';
import {
    IOneBotNetworkAdapter,
    NetworkReloadType,
    OneBotNetworkManager,
    type AdapterStatus,
} from '../src/network';
import type { NetworkAdapterContext } from '../src/network';
import type { JsonObject, NetworkBase } from '../src/types';
import type { DispatchPayload } from '../src/event-filter';

interface FakeNetworkConfig extends NetworkBase {
    // Allows tests to influence behavior via config:
    failOnEvent?: boolean;
}

class FakeAdapter extends IOneBotNetworkAdapter<FakeNetworkConfig> {
    events: JsonObject[] = [];
    opens = 0;
    closes = 0;
    reloads = 0;
    // Last dispatch payload object identity, to assert it was reused per emit.
    lastPayloads: DispatchPayload[] = [];
    waitForEvent: Promise<void> | undefined;

    open(): void {
        this.opens++;

        if (this.config.enabled !== false) {
            this.isEnabled = true;
        }
    }
    close(): void {
        this.closes++;
        this.isEnabled = false;
    }
    // Keeps its own reload — this is a manager test double, not a reload test;
    // base.reload became concrete so this is now a genuine override.
    override reload(next: FakeNetworkConfig): NetworkReloadType {
        this.reloads++;
        this.config = structuredClone(next);

        if (next.enabled === false && this.isEnabled) {
            this.close();
            return NetworkReloadType.Closed;
        }

        if (next.enabled !== false && !this.isEnabled) {
            this.open();
            return NetworkReloadType.Opened;
        }

        return NetworkReloadType.Normal;
    }
    protected bindingSignature(config: FakeNetworkConfig): string {
        return JSON.stringify(config);
    }
    describeStatus(): AdapterStatus {
        return {
            name: this.name,
            kind: 'httpClient',
            status: this.isActive ? 'ok' : 'disabled',
            detail: this.isActive ? 'active' : 'disabled',
        };
    }
    async onEvent(event: JsonObject, payload: DispatchPayload): Promise<void> {
        this.events.push(event);
        this.lastPayloads.push(payload);

        if (this.config.failOnEvent) {
            throw new Error('boom');
        }

        await this.waitForEvent;
    }
}

const NULL_CTX: NetworkAdapterContext = {
    uin: '10001',
    api: {
        handle: async () => ({ status: 'failed', retcode: 0, data: null }),
        processStreamRequest: async () => {},
    } as never,
    buildLifecycleEvent: () => ({}),
    buildHeartbeatEvent: () => ({}),
};

function makeAdapter(name: string, partial: Partial<FakeNetworkConfig> = {}): FakeAdapter {
    const config: FakeNetworkConfig = {
        name,
        enabled: true,
        messageFormat: 'array',
        reportSelfMessage: false,
        ...partial,
    };
    return new FakeAdapter(name, config, NULL_CTX);
}

const SAMPLE_EVENT: JsonObject = {
    time: 1,
    self_id: 10001,
    post_type: 'message',
    message_type: 'private',
    sub_type: 'friend',
    message_id: 1,
    user_id: 22222,
    message: [{ type: 'text', data: { text: 'hi' } }],
    raw_message: 'hi',
    font: 0,
    sender: { user_id: 22222, nickname: 'peer', sex: 'unknown', age: 0 },
};

describe('OneBotNetworkManager', () => {
    it('opens every adapter and emits to every active adapter', async () => {
        const mgr = new OneBotNetworkManager();
        const a = makeAdapter('a');
        const b = makeAdapter('b');
        mgr.register(a);
        mgr.register(b);
        await mgr.openAll();

        expect(a.opens).toBe(1);
        expect(b.opens).toBe(1);

        await mgr.emitEvent(SAMPLE_EVENT);
        expect(a.events).toEqual([SAMPLE_EVENT]);
        expect(b.events).toEqual([SAMPLE_EVENT]);
        // Both adapters should receive the same payload reference (built once).
        expect(a.lastPayloads[0]).toBe(b.lastPayloads[0]);
    });

    it('skips inactive adapters during emit', async () => {
        const mgr = new OneBotNetworkManager();
        const active = makeAdapter('active');
        const idle = makeAdapter('idle', { enabled: false });
        mgr.register(active);
        mgr.register(idle);
        await mgr.openAll();

        await mgr.emitEvent(SAMPLE_EVENT);
        expect(active.events).toHaveLength(1);
        expect(idle.events).toHaveLength(0);
    });

    it('isolates adapter errors so one bad adapter does not block others', async () => {
        const mgr = new OneBotNetworkManager();
        const ok = makeAdapter('ok');
        const bad = makeAdapter('bad', { failOnEvent: true });
        mgr.register(ok);
        mgr.register(bad);
        await mgr.openAll();

        await mgr.emitEvent(SAMPLE_EVENT);
        // The good adapter still saw the event.
        expect(ok.events).toHaveLength(1);
        // The bad adapter logged the throw but didn't crash the manager.
        expect(bad.events).toHaveLength(1);
    });

    it('traces active targets, isolated failures, settlement, and no-target conclusion', async () => {
        const previousLevel = getLogLevel();
        const entries: LogEntry[] = [];
        const unsubscribe = subscribeLogs((entry) => entries.push(entry));
        setLogLevel('trace');

        try {
            const mgr = new OneBotNetworkManager();
            const ok = makeAdapter('ok-target');
            const bad = makeAdapter('bad-target', { failOnEvent: true });
            mgr.register(ok);
            mgr.register(bad);
            await mgr.openAll();

            await runWithRequestId(7001, () => mgr.emitEvent(SAMPLE_EVENT));
            const report = entries.filter(
                (entry) =>
                    entry.scope === 'OneBot.Network' &&
                    entry.level === 'trace' &&
                    entry.req === 7001,
            );
            expect(
                report.find((entry) => entry.message.startsWith('report_targets'))?.message,
            ).toContain('["ok-target","bad-target"]');
            expect(
                report.find((entry) => entry.message.startsWith('report_target_failed'))?.message,
            ).toContain('target=bad-target');
            expect(
                report.filter((entry) => entry.message === 'report_terminal outcome=settled'),
            ).toHaveLength(1);

            entries.length = 0;
            const empty = new OneBotNetworkManager();
            await runWithRequestId(7002, () => empty.emitEvent(SAMPLE_EVENT));
            expect(
                entries.filter(
                    (entry) =>
                        entry.scope === 'OneBot.Network' &&
                        entry.req === 7002 &&
                        entry.message === 'report_terminal outcome=no_active_targets',
                ),
            ).toHaveLength(1);
        } finally {
            unsubscribe();
            setLogLevel(previousLevel);
        }
    });

    it('rejects duplicate registration instead of detaching the old close', async () => {
        const mgr = new OneBotNetworkManager();
        const first = makeAdapter('dup');
        mgr.register(first);
        await mgr.openAll();

        const second = makeAdapter('dup');
        expect(() => mgr.register(second)).toThrow(/already registered/);

        expect(mgr.get('dup')).toBe(first);
        expect(first.closes).toBe(0);
    });

    it('closeOne shuts down a single adapter and removes it', async () => {
        const mgr = new OneBotNetworkManager();
        const a = makeAdapter('a');
        const b = makeAdapter('b');
        mgr.register(a);
        mgr.register(b);
        await mgr.openAll();

        await mgr.closeOne('a');
        expect(mgr.has('a')).toBe(false);
        expect(a.closes).toBe(1);
        expect(b.closes).toBe(0);
        expect(mgr.hasActiveAdapters()).toBe(true);
    });

    it('shutdown clears every adapter', async () => {
        const mgr = new OneBotNetworkManager();
        const a = makeAdapter('a');
        const b = makeAdapter('b');
        mgr.register(a);
        mgr.register(b);
        await mgr.openAll();

        await mgr.shutdown();
        expect(mgr.list()).toHaveLength(0);
        expect(a.closes).toBe(1);
        expect(b.closes).toBe(1);
    });

    it('hasActiveAdapters reflects current state', async () => {
        const mgr = new OneBotNetworkManager();
        expect(mgr.hasActiveAdapters()).toBe(false);
        const a = makeAdapter('a');
        mgr.register(a);
        expect(mgr.hasActiveAdapters()).toBe(false);
        await mgr.openAll();
        expect(mgr.hasActiveAdapters()).toBe(true);
        await mgr.shutdown();
        expect(mgr.hasActiveAdapters()).toBe(false);
    });

    it('rejects new registration after shutdown', async () => {
        const mgr = new OneBotNetworkManager();
        await mgr.shutdown();

        expect(() => mgr.register(makeAdapter('late'))).toThrow(/shutting down/);
        await expect(mgr.shutdown()).resolves.toEqual({ closed: true, errors: [] });
        expect(mgr.list()).toEqual([]);
    });

    it('stops new emits and drains an in-flight emit before adapter close', async () => {
        let release!: () => void;
        const eventGate = new Promise<void>((resolve) => {
            release = resolve;
        });
        const mgr = new OneBotNetworkManager();
        const adapter = makeAdapter('slow');
        adapter.waitForEvent = eventGate;
        mgr.register(adapter);
        await mgr.openAll();

        const emitting = mgr.emitEvent(SAMPLE_EVENT);
        const closing = mgr.shutdown();
        expect(mgr.shutdown()).toBe(closing);
        await expect(mgr.emitEvent(SAMPLE_EVENT)).rejects.toThrow(/shutting down/);
        await Promise.resolve();
        await Promise.resolve();
        expect(adapter.closes).toBe(0);

        release();
        await emitting;
        await closing;
        expect(mgr.shutdown()).toBe(closing);
        expect(adapter.closes).toBe(1);
    });
});