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 { ImageOcrReq, ImageOcrResp } from '@snowluma/proto-defs/oidb-actions/ocr';
import type { SendPacketResult } from '@snowluma/common/packet-sender';

import { ImageOcr } from '../../../src/oidb-services/misc/image-ocr';

// A server OCR response: retCode 0, one text detection with a 2-vertex box.
function ocrResponse(): Buffer {
    const env: OidbBase<ImageOcrResp> = {
        command: 0xe07,
        subCommand: 0,
        body: {
            retCode: 0,
            ocrRspBody: {
                language: 'zh',
                textDetections: [
                    {
                        detectedText: '你好',
                        confidence: 95,
                        polygon: {
                            coordinates: [
                                { x: 1, y: 2 },
                                { x: 3, y: 4 },
                            ],
                        },
                    },
                ],
            },
        },
    };
    return Buffer.from(protobuf_encode<OidbBase<ImageOcrResp>>(env));
}

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

describe('ImageOcr namespace', () => {
    it('declares command 0xE07 sub 0 (no uin form)', () => {
        expect(ImageOcr.command).toBe(0xe07);
        expect(ImageOcr.subCommand).toBe(0);
        expect(ImageOcr.uinForm).toBeUndefined(); // defaults to false in invokeOidb
    });

    it('serializes the image url into ocrReqBody with the fixed version/client/entrance header', () => {
        const out = ImageOcr.serialize({} as any, { imageUrl: 'https://x/a.jpg' });
        expect(out).toMatchObject({ version: 1, client: 0, entrance: 1 });
        expect(out.ocrReqBody).toMatchObject({ imageUrl: 'https://x/a.jpg', isCut: false });
    });

    it('routes to OidbSvcTrpcTcp.0xe07_0 and encodes the exact wire bytes (fixed byte-oracle locks pb tags)', async () => {
        const sender = makeSender();
        await ImageOcr.invoke(sender, { imageUrl: 'https://x/a.jpg' });
        const [cmd, bytes] = sender.sendRawPacket.mock.calls[0]!;
        expect(cmd).toBe('OidbSvcTrpcTcp.0xe07_0');
        // Independent byte-oracle: a fixed hex constant, NOT re-derived from the
        // proto, so a tag change actually goes red (a symmetric encode→decode
        // round-trip would not). Hand-decoded: 08 871c = field1 command varint
        // 0xE07; 22 17 = field4 body (23B); body: 08 01 version=1, 18 01
        // entrance=1 (client=0 omitted), 52 11 = field10 ocrReqBody (17B):
        // 0a 0f = field1 imageUrl + "https://x/a.jpg".
        expect(Buffer.from(bytes).toString('hex')).toBe(
            '08871c22170801180152110a0f68747470733a2f2f782f612e6a7067',
        );
        // And the structure decodes back as expected.
        const env = protobuf_decode<OidbBase<ImageOcrReq>>(bytes);
        expect(env.command).toBe(0xe07);
        expect(env.body.ocrReqBody?.imageUrl).toBe('https://x/a.jpg');
    });

    it('deserializes an empty ocr body to {texts:[], language:""}', () => {
        expect(ImageOcr.deserialize({} as any, { retCode: 0 })).toEqual({
            texts: [],
            language: '',
        });
    });

    it('deserializes text detections + coordinates + language', async () => {
        const result = await ImageOcr.invoke(makeSender(), { imageUrl: 'https://x/a.jpg' });
        expect(result.language).toBe('zh');
        expect(result.texts).toEqual([
            {
                text: '你好',
                confidence: 95,
                coordinates: [
                    { x: 1, y: 2 },
                    { x: 3, y: 4 },
                ],
            },
        ]);
    });

    it('throws on a non-zero retCode', () => {
        expect(() =>
            ImageOcr.deserialize({} as any, { retCode: 5, errMsg: 'bad', wording: 'nope' }),
        ).toThrow();
    });
});