// Regression coverage for large-video → file-upload fallback.
//
// When a video exceeds QQ's Highway video ceiling the element-pipeline
// send throws. The OneBot layer catches that and re-routes the video
// through the dedicated file-upload pipeline (group: groupFile.upload,
// private: groupFile.uploadPrivate). The element-builder cannot produce
// a group file element on its own because it has no uploaded file_id at
// build time — so the fallback MUST live at the OneBot layer for both
// scenes (private already did; #153 left the group side broken).

import { describe, expect, it, vi } from 'vitest';
import type { MessageElement } from '@snowluma/protocol/events';
import type { BridgeInterface } from '../../src/bridge/bridge-interface';
import type { OneBotInstanceContext } from '../src/instance-context';
import { sendGroupMessage, videoNeedsFileFallback } from '../src/modules/message-actions';

const MB = 1024 * 1024;

function fakeBridge(overrides: Partial<BridgeInterface> = {}): BridgeInterface {
    return new Proxy({ identity: { nickname: 'SnowLuma' }, ...overrides } as BridgeInterface, {
        get(target, prop) {
            if (prop in target) {
                return (target as any)[prop];
            }

            throw new Error(`fakeBridge: '${String(prop)}' was not stubbed for this test`);
        },
    });
}

function makeCtx(bridge: BridgeInterface): OneBotInstanceContext {
    return {
        uin: '10001',
        selfId: 10001,
        bridge,
        messageStore: {
            findEvent: () => null,
            resolveReplySequence: () => 0,
            storeEvent: vi.fn(),
        } as any,
        cacheMessageMeta: vi.fn(),
        mediaStore: {} as any,
        converterCtx: {
            selfId: 10001,
            imageUrlResolver: null,
            mediaUrlResolver: null,
            messageIdResolver: null,
            mediaSegmentSink: null,
        },
        musicSignUrl: '',
    } as unknown as OneBotInstanceContext;
}

describe('send_group_msg large-video fallback', () => {
    it('routes the video through groupFile.upload when the Highway send fails with a size error', async () => {
        const sendGroup = vi.fn(async (_gid: number, _elements: any[]) => {
            throw new Error('video file too large: 1200 MB exceeds limit');
        });
        const upload = vi.fn(
            async (
                _gid: number,
                _src: string,
                _name: string,
                _folder: string,
                _doUpload: boolean,
            ) => ({ fileId: 'auto-fid', fileHash: null }),
        );
        const publish = vi.fn();
        const bridge = fakeBridge({
            apis: {
                message: { sendGroup },
                groupFile: { upload, publish },
            } as any,
            resolveUserUid: vi.fn(),
        } as any);
        const ctx = makeCtx(bridge);

        await sendGroupMessage(
            ctx,
            12345,
            [
                {
                    type: 'video',
                    data: { file: 'http://example.com/big.mp4' },
                },
            ] as any,
            false,
        );

        // Highway send was attempted once (and threw)...
        expect(sendGroup).toHaveBeenCalledOnce();
        // ...then the video was re-routed through the group file pipeline.
        expect(upload).toHaveBeenCalledOnce();
        const [gid, src, name] = upload.mock.calls[0]!;
        expect(gid).toBe(12345);
        expect(src).toBe('http://example.com/big.mp4');
        expect(name).toBe('video.mp4');
        expect(publish).toHaveBeenCalledExactlyOnceWith(12345, 'auto-fid', undefined);
    });

    it('rethrows (no fallback) when a remote video fails with a non-size error', async () => {
        // Size can't be inferred for a remote URL, and the error isn't
        // size-related — we must not silently swallow an unrelated failure
        // by converting it to a file upload.
        const sendGroup = vi.fn(async (_gid: number, _elements: any[]) => {
            throw new Error('network reset while streaming chunk 3');
        });
        const upload = vi.fn();
        const bridge = fakeBridge({
            apis: {
                message: { sendGroup },
                groupFile: { upload, publish: vi.fn() },
            } as any,
            resolveUserUid: vi.fn(),
        } as any);
        const ctx = makeCtx(bridge);

        await expect(
            sendGroupMessage(
                ctx,
                12345,
                [
                    {
                        type: 'video',
                        data: { file: 'http://example.com/big.mp4' },
                    },
                ] as any,
                false,
            ),
        ).rejects.toThrow('network reset');

        expect(upload).not.toHaveBeenCalled();
    });
});

describe('videoNeedsFileFallback', () => {
    it('triggers on a known oversize source regardless of the error message', () => {
        // Above MAX_VIDEO_SIZE (1.5 GiB) the video is re-routed to the file
        // pipeline even when the error isn't size-worded. Source size is known,
        // so the fallback fires from the size alone.
        const big = { type: 'video', fileSize: 1700 * MB } as MessageElement;
        expect(videoNeedsFileFallback(big, /* isSizeErr */ false)).toBe(true);
    });

    it('does not trigger for a known under-limit source (now covers large videos)', () => {
        // 500 MB used to route to file under the old 100 MB cap; it now sends as
        // a real video (verified on tempserver up to ~500 MB).
        const small = { type: 'video', fileSize: 500 * MB } as MessageElement;
        expect(videoNeedsFileFallback(small, true)).toBe(false);
    });

    it('falls back to the error heuristic when the source size is unknown', () => {
        const remote = { type: 'video', url: 'http://example.com/v.mp4' } as MessageElement;
        expect(videoNeedsFileFallback(remote, true)).toBe(true);
        expect(videoNeedsFileFallback(remote, false)).toBe(false);
    });

    it('never triggers for non-video elements', () => {
        const img = { type: 'image', fileSize: 1400 * MB } as MessageElement;
        expect(videoNeedsFileFallback(img, true)).toBe(false);
    });
});