import { EventEmitter } from "node:events";
import { PassThrough } from "node:stream";
import { describe, expect, it, vi } from "vitest";
import { createMusicPlayer } from "../../src/media/musicPlayer";
import type { DiscordAudioPlayer } from "../../src/media/mediaTypes";

class FakeProcess extends EventEmitter {
  stdout = new PassThrough();
  stderr = new PassThrough();
  killed = false;
  kill = vi.fn(() => {
    this.killed = true;
    this.emit("close", 0);
    return true;
  });
}

describe("createMusicPlayer", () => {
  it("spawns ffmpeg as Ogg Opus and passes stdout to Discord", async () => {
    const proc = new FakeProcess();
    const spawn = vi.fn(() => proc);
    const discordPlayer: DiscordAudioPlayer = {
      isConnected: () => true,
      playStream: vi.fn(),
      stop: vi.fn(),
    };
    const player = createMusicPlayer({ spawn, discordPlayer });

    const playback = player.play({
      source: "https://example.com/song.mp3",
      title: "song.mp3",
      kind: "url",
    });
    proc.emit("close", 0);
    await playback.done;

    expect(spawn).toHaveBeenCalledWith("ffmpeg", [
      "-hide_banner",
      "-loglevel",
      "warning",
      "-i",
      "https://example.com/song.mp3",
      "-vn",
      "-acodec",
      "libopus",
      "-ar",
      "48000",
      "-ac",
      "2",
      "-f",
      "ogg",
      "pipe:1",
    ], { stdio: ["ignore", "pipe", "pipe"] });
    expect(discordPlayer.playStream).toHaveBeenCalledWith(proc.stdout);
  });

  it("rejects playback when Discord is not connected", () => {
    const spawn = vi.fn(() => new FakeProcess());
    const discordPlayer: DiscordAudioPlayer = {
      isConnected: () => false,
      playStream: vi.fn(),
      stop: vi.fn(),
    };
    const player = createMusicPlayer({ spawn, discordPlayer });

    expect(() =>
      player.play({ source: "/tmp/song.ogg", title: "song.ogg", kind: "local" }),
    ).toThrow("Discord audio player is not connected");
    expect(spawn).not.toHaveBeenCalled();
  });

  it("kills ffmpeg and stops Discord playback once", () => {
    const proc = new FakeProcess();
    const discordPlayer: DiscordAudioPlayer = {
      isConnected: () => true,
      playStream: vi.fn(),
      stop: vi.fn(),
    };
    const player = createMusicPlayer({ spawn: vi.fn(() => proc), discordPlayer });

    const playback = player.play({ source: "/tmp/song.ogg", title: "song.ogg", kind: "local" });
    playback.stop();
    playback.stop();

    expect(proc.kill).toHaveBeenCalledTimes(1);
    expect(proc.kill).toHaveBeenCalledWith("SIGTERM");
    expect(discordPlayer.stop).toHaveBeenCalledTimes(1);
  });
});