import { describe, expect, it, vi } from 'vitest';
import { protobuf_decode, protobuf_encode } from '@snowluma/proton';
import type { OidbBase } from '@snowluma/proto-defs/oidb';
import type { Oidb0x990Req, Oidb0x990Resp } from '@snowluma/proto-defs/oidb-actions/base';
import type { SendPacketResult } from '@snowluma/common/packet-sender';

import { TranslateEnToZh } from '../../../src/oidb-services/misc/translate-en-to-zh';

function makeSender(resp?: Buffer) {
    const r: SendPacketResult = {
        success: true,
        gotResponse: true,
        errorCode: 0,
        errorMessage: '',
        responseData: resp ?? Buffer.alloc(0),
    };
    return { sendRawPacket: vi.fn(async () => r) };
}

describe('TranslateEnToZh namespace', () => {
    it('declares 0x990_2', () => {
        expect(TranslateEnToZh.command).toBe(0x990);
        expect(TranslateEnToZh.subCommand).toBe(2);
    });

    describe('serialize', () => {
        it('hardcodes en → zh and tag10/12 = 1', () => {
            const out = TranslateEnToZh.serialize({} as any, { words: ['hello'] });
            expect(out).toEqual({
                translateReq: { srcLang: 'en', dstLang: 'zh', words: ['hello'] },
                tag10: 1,
                tag12: 1,
            });
        });

        it('passes the words array verbatim', () => {
            const out = TranslateEnToZh.serialize({} as any, { words: ['a', 'b', 'c'] });
            expect(out.translateReq?.words).toEqual(['a', 'b', 'c']);
        });
    });

    describe('deserialize', () => {
        it('returns dstWords when translateResp is present', () => {
            expect(
                TranslateEnToZh.deserialize(
                    {} as any,
                    {
                        translateResp: { dstWords: ['你好', '世界'] },
                    } as Oidb0x990Resp,
                ),
            ).toEqual(['你好', '世界']);
        });

        it('returns [] when dstWords is omitted but translateResp exists', () => {
            expect(
                TranslateEnToZh.deserialize({} as any, { translateResp: {} } as Oidb0x990Resp),
            ).toEqual([]);
        });

        it('throws when translateResp is missing', () => {
            expect(() => TranslateEnToZh.deserialize({} as any, {} as Oidb0x990Resp)).toThrow(
                'translate response empty',
            );
        });
    });

    describe('invoke (e2e)', () => {
        it('routes to OidbSvcTrpcTcp.0x990_2', async () => {
            const sender = makeSender(
                Buffer.from(
                    protobuf_encode<OidbBase<Oidb0x990Resp>>({
                        body: { translateResp: { dstWords: ['x'] } } as any,
                    }),
                ),
            );
            await TranslateEnToZh.invoke(sender, { words: ['hello'] });
            expect(sender.sendRawPacket.mock.calls[0]![0]).toBe('OidbSvcTrpcTcp.0x990_2');
        });

        it('encodes envelope body with the request payload', async () => {
            const sender = makeSender(
                Buffer.from(
                    protobuf_encode<OidbBase<Oidb0x990Resp>>({
                        body: { translateResp: { dstWords: ['你好'] } } as any,
                    }),
                ),
            );
            const out = await TranslateEnToZh.invoke(sender, { words: ['hello'] });
            expect(out).toEqual(['你好']);
            const [, bytes] = sender.sendRawPacket.mock.calls[0]!;
            const env = protobuf_decode<OidbBase<Oidb0x990Req>>(bytes);
            expect(env.body?.translateReq?.words).toEqual(['hello']);
        });
    });
});