// Base-level test for the reload state machine that `IOneBotNetworkAdapter`
// now owns (the template method lifted out of all four concrete adapters).
//
// It imports `../src/network/adapter` DIRECTLY rather than the `../src/network`
// barrel on purpose: the barrel re-exports the ws adapters, which pull in
// `@snowluma/websocket`'s native addon — absent in a plain checkout. The base
// class has no such dependency, so the state machine is testable in isolation.
//
// A `ProbeAdapter` deliberately does NOT override `reload()`: it exercises the
// inherited template, with `open()`/`close()` reduced to call-counters so each
// test can assert exactly which transition the template drove (and that the
// returned `NetworkReloadType` — a test-only observability seam — matches).

import { describe, expect, it } from 'vitest';
import {
    IOneBotNetworkAdapter,
    NetworkReloadType,
    type AdapterStatus,
    type NetworkAdapterContext,
} from '../src/network/adapter';
import type { NetworkBase } from '../src/types';

interface ProbeConfig extends NetworkBase {
    /** The only field `bindingSignature` reads — lets a test flip the binding
     *  independently of `enabled` / `url`. */
    sig?: string;
    /** Present only so the client-style `willEnable` override has something to
     *  require. */
    url?: string;
}

const CTX: NetworkAdapterContext = {
    uin: '10001',
    api: {} as never,
    buildLifecycleEvent: () => ({}),
    buildHeartbeatEvent: () => ({}),
};

class ProbeAdapter extends IOneBotNetworkAdapter<ProbeConfig> {
    opens = 0;
    closes = 0;
    configReplaced = 0;

    constructor(
        name: string,
        config: ProbeConfig,
        private readonly requireUrl = false,
    ) {
        super(name, config, CTX);
    }

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

        // Faithful to the real adapters: only actually enable when the config says
        // so. The template should only ever call open() when willEnable is true,
        // so this doubles as an invariant check.
        if (this.willEnable(this.config)) {
            this.isEnabled = true;
        }
    }

    close(): void {
        this.closes++;
        this.isEnabled = false;
    }

    onEvent(): void {
        /* unused here */
    }

    describeStatus(): AdapterStatus {
        return {
            name: this.name,
            kind: 'httpServer',
            status: this.isEnabled ? 'ok' : 'disabled',
            detail: '',
        };
    }

    protected bindingSignature(config: ProbeConfig): string {
        return config.sig ?? 'fixed';
    }

    // Mirrors the client adapters (ws-client / http-post): also requires a url.
    protected override willEnable(config: ProbeConfig): boolean {
        return config.enabled !== false && (!this.requireUrl || !!config.url);
    }

    protected override onConfigReplaced(_next: ProbeConfig): void {
        this.configReplaced++;
    }
}

function cfg(partial: Partial<ProbeConfig> = {}): ProbeConfig {
    return {
        name: 'probe',
        enabled: true,
        sig: 'A',
        messageFormat: 'array',
        reportSelfMessage: false,
        ...partial,
    };
}

/** Build a probe, optionally bring it to the enabled state, then zero the
 *  counters so a test observes only reload-driven open/close calls. */
function makeProbe(
    initial: Partial<ProbeConfig>,
    opts: { requireUrl?: boolean; open?: boolean } = {},
): ProbeAdapter {
    const a = new ProbeAdapter('probe', cfg(initial), opts.requireUrl);

    if (opts.open) {
        a.open();
    }

    a.opens = 0;
    a.closes = 0;
    a.configReplaced = 0;
    return a;
}

describe('IOneBotNetworkAdapter.reload — shared state machine', () => {
    it('stable enabled, signature unchanged → Normal (no open/close)', async () => {
        const a = makeProbe({ sig: 'A' }, { open: true });
        expect(a.isActive).toBe(true);

        const t = await a.reload(cfg({ sig: 'A' }));

        expect(t).toBe(NetworkReloadType.Normal);
        expect(a.opens).toBe(0);
        expect(a.closes).toBe(0);
        expect(a.isActive).toBe(true);
    });

    it('stable disabled stays disabled → Normal (no open/close)', async () => {
        const a = makeProbe({ enabled: false, sig: 'A' }); // not opened → wasEnabled=false
        expect(a.isActive).toBe(false);

        const t = await a.reload(cfg({ enabled: false, sig: 'A' }));

        expect(t).toBe(NetworkReloadType.Normal);
        expect(a.opens).toBe(0);
        expect(a.closes).toBe(0);
        expect(a.isActive).toBe(false);
    });

    it('disabled → enabled → Opened (open only)', async () => {
        const a = makeProbe({ enabled: false, sig: 'A' });

        const t = await a.reload(cfg({ enabled: true, sig: 'A' }));

        expect(t).toBe(NetworkReloadType.Opened);
        expect(a.opens).toBe(1);
        expect(a.closes).toBe(0);
        expect(a.isActive).toBe(true);
    });

    it('disabled → enabled even with a changed signature → Opened, NOT Reopened', async () => {
        // Reopened requires wasEnabled; a signature change alone must not promote
        // an Opened into a Reopened.
        const a = makeProbe({ enabled: false, sig: 'A' });

        const t = await a.reload(cfg({ enabled: true, sig: 'B' }));

        expect(t).toBe(NetworkReloadType.Opened);
        expect(a.opens).toBe(1);
        expect(a.closes).toBe(0);
    });

    it('enabled → disabled (enabled:false), signature unchanged → Closed (close only)', async () => {
        const a = makeProbe({ sig: 'A' }, { open: true });

        const t = await a.reload(cfg({ enabled: false, sig: 'A' }));

        expect(t).toBe(NetworkReloadType.Closed);
        expect(a.closes).toBe(1);
        expect(a.opens).toBe(0);
        expect(a.isActive).toBe(false);
    });

    it('enabled, signature changed, still enabled → Reopened (close + open)', async () => {
        const a = makeProbe({ sig: 'A' }, { open: true });

        const t = await a.reload(cfg({ sig: 'B' }));

        expect(t).toBe(NetworkReloadType.Reopened);
        expect(a.closes).toBe(1);
        expect(a.opens).toBe(1);
        expect(a.isActive).toBe(true);
    });

    it('enabled, signature changed, will disable → Closed (close only, no reopen)', async () => {
        const a = makeProbe({ sig: 'A' }, { open: true });

        const t = await a.reload(cfg({ enabled: false, sig: 'B' }));

        expect(t).toBe(NetworkReloadType.Closed);
        expect(a.closes).toBe(1);
        expect(a.opens).toBe(0);
        expect(a.isActive).toBe(false);
    });

    it('onConfigReplaced runs on every reload, and config is swapped before the decision', async () => {
        const a = makeProbe({ sig: 'A' }, { open: true });

        await a.reload(cfg({ sig: 'A' })); // Normal
        await a.reload(cfg({ sig: 'B' })); // Reopened
        await a.reload(cfg({ enabled: false, sig: 'B' })); // Closed

        expect(a.configReplaced).toBe(3);
        expect(a.currentConfig.sig).toBe('B');
        expect(a.currentConfig.enabled).toBe(false);
    });

    describe('willEnable override (client-style: requires url)', () => {
        it('enabled:true but no url → willEnable false → stays disabled → Normal', async () => {
            const a = makeProbe({ enabled: false, sig: 'A', url: undefined }, { requireUrl: true });

            const t = await a.reload(cfg({ enabled: true, sig: 'A', url: undefined }));

            expect(t).toBe(NetworkReloadType.Normal);
            expect(a.opens).toBe(0);
            expect(a.isActive).toBe(false);
        });

        it('enabled:true with a url → Opened', async () => {
            const a = makeProbe({ enabled: false, sig: 'A' }, { requireUrl: true });

            const t = await a.reload(cfg({ enabled: true, sig: 'A', url: 'ws://x' }));

            expect(t).toBe(NetworkReloadType.Opened);
            expect(a.opens).toBe(1);
            expect(a.isActive).toBe(true);
        });

        it('url removed while enabled (signature unchanged) → willEnable false → Closed', async () => {
            // Proves the `wasEnabled && !willEnable` branch fires from the predicate
            // alone, independent of any binding-signature change.
            const a = makeProbe({ sig: 'A', url: 'ws://x' }, { requireUrl: true, open: true });
            expect(a.isActive).toBe(true);

            const t = await a.reload(cfg({ enabled: true, sig: 'A', url: undefined }));

            expect(t).toBe(NetworkReloadType.Closed);
            expect(a.closes).toBe(1);
            expect(a.opens).toBe(0);
            expect(a.isActive).toBe(false);
        });
    });
});