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 { OidbOfflineFileFinalizeResp } from '@snowluma/proto-defs/oidb-actions/media';
import type { FileExtra } from '@snowluma/proto-defs/message';
import type { SendPacketResult } from '@snowluma/common/packet-sender';

import { FinalizeOfflineFile } from '../../../src/oidb-services/group-file/finalize-offline-file';
import { env, m, s, v } from '../_pb-oracle';

// `bytes` fields are wire type 2 — identical framing to a sub-message, so the
// oracle's `m()` (tag + length + payload) doubles as the bytes emitter.
const b = m;

function makeDeps(resp?: OidbOfflineFileFinalizeResp) {
    const responseData =
        resp !== undefined
            ? Buffer.from(protobuf_encode<OidbBase<OidbOfflineFileFinalizeResp>>({ body: resp }))
            : Buffer.alloc(0);
    const r: SendPacketResult = {
        success: true,
        gotResponse: true,
        errorCode: 0,
        errorMessage: '',
        responseData,
    };
    return { sendRawPacket: vi.fn(async () => r) };
}

describe('FinalizeOfflineFile (0xE37_800)', () => {
    it('declares 0xE37_800', () => {
        expect(FinalizeOfflineFile.command).toBe(0xe37);
        expect(FinalizeOfflineFile.subCommand).toBe(800);
    });

    it('serializes the request body byte-for-byte (oracle locks every tag)', async () => {
        const deps = makeDeps({});
        await FinalizeOfflineFile.invoke(deps, {
            senderUid: 'su',
            receiverUid: 'ru',
            fileUuid: 'uuid',
            fileHash: 'hh',
        });
        const [wire, bytes] = deps.sendRawPacket.mock.calls[0]!;
        expect(wire).toBe('OidbSvcTrpcTcp.0xe37_800');

        // body(10) { senderUid(10) receiverUid(20) fileUuid(30) fileHash(40) }
        const innerBody = [...s(10, 'su'), ...s(20, 'ru'), ...s(30, 'uuid'), ...s(40, 'hh')];
        // req: subCommand(1)=800, field2(2)=0 omitted, body(10), field101(101)=3,
        //      field102(102)=1, field200(200)=1
        const req = [...v(1, 800), ...m(10, innerBody), ...v(101, 3), ...v(102, 1), ...v(200, 1)];
        const expected = env(0xe37, 800, req, false);
        expect(Buffer.from(bytes).toString('hex')).toBe(expected);
    });

    it('extracts the download-routing metadata from field30 of the response', async () => {
        const deps = makeDeps({
            body: {
                metadata: {
                    field3: 5,
                    field100: new Uint8Array([9, 9]),
                    field101: new Uint8Array([8]),
                    field110: 7,
                    timestamp1: 42,
                },
            },
        });
        const meta = await FinalizeOfflineFile.invoke(deps, {
            senderUid: 'su',
            receiverUid: 'ru',
            fileUuid: 'uuid',
            fileHash: 'hh',
        });
        expect(meta.field3).toBe(5);
        expect(meta.field110).toBe(7);
        expect(meta.timestamp1).toBe(42);
        expect(Array.from(meta.field100 ?? [])).toEqual([9, 9]);
        expect(Array.from(meta.field101 ?? [])).toEqual([8]);
    });

    it('returns {} when the response carries no metadata', async () => {
        const deps = makeDeps({});
        const meta = await FinalizeOfflineFile.invoke(deps, {
            senderUid: 'su',
            receiverUid: 'ru',
            fileUuid: 'uuid',
            fileHash: 'hh',
        });
        expect(meta).toEqual({});
    });
});

describe('FileExtra.field6 (c2c download routing — issue #157)', () => {
    it('encodes field6.field2 with the exact NapCat tag layout', () => {
        const extra: FileExtra = {
            field6: {
                field2: {
                    field1: 7,
                    fileUuid: 'uu',
                    fileName: 'n.bin',
                    field6: 3,
                    field7: new Uint8Array([1, 2]),
                    field8: new Uint8Array([3]),
                    timestamp1: 99,
                    fileHash: 'hh',
                    selfUid: 'su',
                    destUid: 'du',
                },
            },
        };
        const hex = Buffer.from(protobuf_encode<FileExtra>(extra)).toString('hex');

        // PrivateFileExtraField2 in ascending tag order:
        //   field1(1) fileUuid(4) fileName(5) field6(6) field7(7,bytes)
        //   field8(8,bytes) timestamp1(9) fileHash(14) selfUid(15) destUid(16)
        const f2 = [
            ...v(1, 7),
            ...s(4, 'uu'),
            ...s(5, 'n.bin'),
            ...v(6, 3),
            ...b(7, [1, 2]),
            ...b(8, [3]),
            ...v(9, 99),
            ...s(14, 'hh'),
            ...s(15, 'su'),
            ...s(16, 'du'),
        ];
        // PrivateFileExtra { field2(2) } → FileExtra { field6(6) }
        const expected = Buffer.from(m(6, m(2, f2))).toString('hex');
        expect(hex).toBe(expected);
    });

    it('round-trips field6 through encode/decode', () => {
        const extra: FileExtra = {
            file: { fileUuid: 'u', fileName: 'f', subcmd: 1 },
            field6: {
                field2: {
                    field1: 1,
                    fileUuid: 'u',
                    fileName: 'f',
                    timestamp1: 5,
                    selfUid: 's',
                    destUid: 'd',
                },
            },
        };
        const back = protobuf_decode<FileExtra>(protobuf_encode<FileExtra>(extra));
        expect(back.field6?.field2).toMatchObject({
            field1: 1,
            fileUuid: 'u',
            fileName: 'f',
            timestamp1: 5,
            selfUid: 's',
            destUid: 'd',
        });
        expect(back.file?.subcmd).toBe(1);
    });
});