evOo-local/packages/adapters/src/media/media-test-support.ts

import { copyFile, mkdtemp, stat, writeFile } from "node:fs/promises";
import { tmpdir } from "node:os";
import { join } from "node:path";
import type { MediaJobContext, MediaJobInputFile, MediaJobOutputFile } from "@rakazo/adapter-kit";
import type { MediaOutput, MediaOutputKind } from "@rakazo/contracts";
import { attachmentKindOf } from "@rakazo/contracts";
import { runFfmpeg } from "./ffmpeg.js";

export interface TestClips {
  dir: string;
  /** 320×180, 25 fps, 3 s, 440 Hz tone. */
  landscape: string;
  /** 180×320, 30 fps, 2 s, no audio. */
  silentPortrait: string;
  srt: string;
  vtt: string;
}

/** Tiny generated clips; nothing binary is committed. */
export async function createTestClips(): Promise<TestClips> {
  const dir = await mkdtemp(join(tmpdir(), "evoo-media-test-"));
  const landscape = join(dir, "landscape.mp4");
  const silentPortrait = join(dir, "silent-portrait.mp4");
  const encode = ["-c:v", "libx264", "-preset", "ultrafast", "-pix_fmt", "yuv420p"];
  await runFfmpeg([
    ...["-f", "lavfi", "-i", "testsrc=size=320x180:rate=25:duration=3"],
    ...["-f", "lavfi", "-i", "sine=frequency=440:sample_rate=44100:duration=3"],
    ...encode,
    ...["-c:a", "aac", "-shortest", `file:${landscape}`],
  ]);
  await runFfmpeg([
    ...["-f", "lavfi", "-i", "testsrc2=size=180x320:rate=30:duration=2"],
    ...encode,
    `file:${silentPortrait}`,
  ]);
  const srt = join(dir, "captions.srt");
  await writeFile(
    srt,
    "1\n00:00:00,100 --> 00:00:01,500\nHello from the subtitles\n\n2\n00:00:01,500 --> 00:00:02,900\nZweite Zeile äöü\n",
  );
  const vtt = join(dir, "captions.vtt");
  await writeFile(vtt, "WEBVTT\n\n00:00.100 --> 00:01.500\nHello from WebVTT\n");
  return { dir, landscape, silentPortrait, srt, vtt };
}

export interface TestArtifact {
  path: string;
  name: string;
  mimeType: string;
  kind?: MediaOutputKind;
}

/** A MediaJobContext over local files that records progress and outputs. */
export async function fakeMediaJobContext(input: unknown, artifacts: Record<string, TestArtifact>) {
  const tempDir = await mkdtemp(join(tmpdir(), "evoo-media-job-"));
  const controller = new AbortController();
  const progress: number[] = [];
  const outputs: (MediaJobOutputFile & { size: number; posterSize?: number })[] = [];
  const context: MediaJobContext = {
    jobId: "job-1",
    spaceId: "space-1",
    userId: "user-1",
    botId: null,
    input,
    tempDir,
    signal: controller.signal,
    progress: async (fraction) => {
      progress.push(fraction);
    },
    fetchArtifact: async (artifactId): Promise<MediaJobInputFile> => {
      const artifact = artifacts[artifactId];
      if (!artifact) throw new Error(`Artifact ${artifactId} not found.`);
      const path = join(tempDir, `input-${artifactId}`);
      await copyFile(artifact.path, path);
      return {
        artifactId,
        path,
        name: artifact.name,
        mimeType: artifact.mimeType,
        kind: artifact.kind ?? attachmentKindOf(artifact.mimeType),
        size: (await stat(path)).size,
      };
    },
    addOutput: async (file): Promise<MediaOutput> => {
      // Files must exist when handed over; the runner stores them before the job ends.
      const size = (await stat(file.path)).size;
      const posterSize = file.posterPath ? (await stat(file.posterPath)).size : undefined;
      outputs.push({ ...file, size, ...(posterSize !== undefined ? { posterSize } : {}) });
      const index = outputs.length;
      return {
        artifactId: `output-${index}`,
        kind: attachmentKindOf(file.mimeType),
        mimeType: file.mimeType,
        name: file.name,
        size,
        ...(file.width ? { width: file.width } : {}),
        ...(file.height ? { height: file.height } : {}),
        ...(file.durationMs !== undefined ? { durationMs: file.durationMs } : {}),
        ...(file.posterPath ? { posterArtifactId: `poster-${index}` } : {}),
        ...(file.parentArtifactId ? { parentArtifactId: file.parentArtifactId } : {}),
        ...(file.preset ? { preset: file.preset } : {}),
      };
    },
  };
  return { context, controller, progress, outputs, tempDir };
}