"""Shared fixtures: yt-dlp is always replaced by fakes (no network)."""
import json
import shutil
import subprocess
from pathlib import Path

import pytest


@pytest.fixture
def fake_yt_dlp():
    """Factory for a subprocess.run stand-in.

    It answers the info request with `info` and writes `vtt` where yt-dlp would
    write the subtitle file. `run.calls` records every command.
    """
    def make(info, vtt="WEBVTT\n", write=True, fail_download=False):
        calls = []

        def run(command, capture_output, text):
            calls.append(command)
            if "--dump-single-json" in command:
                return subprocess.CompletedProcess(command, 0, json.dumps(info), "")
            if fail_download:
                return subprocess.CompletedProcess(command, 1, "", "HTTP Error 429")
            track = command[command.index("--sub-langs") + 1]
            template = command[command.index("-o") + 1]
            if write:
                Path(template.replace("%(ext)s", f"{track}.vtt")).write_text(
                    vtt, encoding="utf-8"
                )
            return subprocess.CompletedProcess(command, 0, "", "")

        run.calls = calls
        return run

    return make


@pytest.fixture
def yt_dlp_installed(monkeypatch):
    monkeypatch.setattr(shutil, "which", lambda name: f"/usr/bin/{name}")