import subprocess
import sys
from pathlib import Path

import pytest

from repub import job_runner as job_runner_module
from repub.config import FeedConfig, feed_output_path, staged_feed_output_path
from repub.job_runner import JobSourceConfig, _build_crawl_settings

VALID_FEED = '<rss version="2.0"><channel><title>new</title></channel></rss>\n'


def test_build_crawl_settings_passes_feed_url_to_spider(tmp_path: Path) -> None:
    settings = _build_crawl_settings(
        out_dir=tmp_path / "out",
        feed=FeedConfig(
            name="Demo Feed",
            slug="demo",
            url="https://source.example/feed.rss",
        ),
        stats_path=tmp_path / "stats.jsonl",
        feed_url="https://mirror.example",
    )

    assert settings["REPUBLISHER_FEED_URL"] == "https://mirror.example"


def test_build_crawl_settings_requires_non_empty_feed_url(
    tmp_path: Path,
) -> None:
    with pytest.raises(ValueError, match="feed_url setting is required"):
        _build_crawl_settings(
            out_dir=tmp_path / "out",
            feed=FeedConfig(
                name="Demo Feed",
                slug="demo",
                url="https://source.example/feed.rss",
            ),
            stats_path=tmp_path / "stats.jsonl",
            feed_url="",
        )


def test_main_publishes_staged_feed_after_successful_crawl(
    monkeypatch: pytest.MonkeyPatch, tmp_path: Path
) -> None:
    out_dir = tmp_path / "out"
    public_path = feed_output_path(out_dir=out_dir, feed_slug="demo")
    staged_path = staged_feed_output_path(out_dir=out_dir, feed_slug="demo")
    public_path.parent.mkdir(parents=True)
    public_path.write_text("<rss>old</rss>\n", encoding="utf-8")
    staged_path.write_text(VALID_FEED, encoding="utf-8")

    _patch_worker_dependencies(monkeypatch, exit_code=0)

    exit_code = job_runner_module.main(
        [
            "--job-id",
            "1",
            "--execution-id",
            "2",
            "--db-path",
            str(tmp_path / "republisher.db"),
            "--out-dir",
            str(out_dir),
            "--stats-path",
            str(tmp_path / "stats.jsonl"),
        ]
    )

    assert exit_code == 0
    assert public_path.read_text(encoding="utf-8") == VALID_FEED
    assert not staged_path.exists()


def test_main_holds_media_cleanup_lock_during_crawl(
    monkeypatch: pytest.MonkeyPatch, tmp_path: Path
) -> None:
    out_dir = tmp_path / "out"
    public_path = feed_output_path(out_dir=out_dir, feed_slug="demo")
    staged_path = staged_feed_output_path(out_dir=out_dir, feed_slug="demo")
    public_path.parent.mkdir(parents=True)
    public_path.write_text("<rss>old</rss>\n", encoding="utf-8")
    staged_path.write_text(VALID_FEED, encoding="utf-8")

    def assert_media_lock_is_held(*, process, feed, spider_arguments) -> int:
        lock_path = out_dir.resolve() / ".media-retention.lock"
        script = """
import fcntl
import sys
from pathlib import Path

lock_path = Path(sys.argv[1])
lock_path.parent.mkdir(parents=True, exist_ok=True)
with lock_path.open("a", encoding="utf-8") as lock_file:
    try:
        fcntl.flock(lock_file.fileno(), fcntl.LOCK_EX | fcntl.LOCK_NB)
    except BlockingIOError:
        sys.exit(0)
    else:
        fcntl.flock(lock_file.fileno(), fcntl.LOCK_UN)
        sys.exit(2)
"""
        completed = subprocess.run(
            [sys.executable, "-c", script, str(lock_path)],
            cwd=Path.cwd(),
            capture_output=True,
            check=False,
            text=True,
        )
        assert completed.returncode == 0, completed.stdout + completed.stderr
        return 0

    _patch_worker_dependencies(
        monkeypatch, exit_code=0, run_crawl=assert_media_lock_is_held
    )

    exit_code = job_runner_module.main(
        [
            "--job-id",
            "1",
            "--execution-id",
            "2",
            "--db-path",
            str(tmp_path / "republisher.db"),
            "--out-dir",
            str(out_dir),
            "--stats-path",
            str(tmp_path / "stats.jsonl"),
        ]
    )

    assert exit_code == 0


def test_main_does_not_publish_unusable_staged_feed_after_successful_crawl(
    monkeypatch: pytest.MonkeyPatch, tmp_path: Path
) -> None:
    out_dir = tmp_path / "out"
    public_path = feed_output_path(out_dir=out_dir, feed_slug="demo")
    staged_path = staged_feed_output_path(out_dir=out_dir, feed_slug="demo")
    public_path.parent.mkdir(parents=True)
    public_path.write_text("<rss>old</rss>\n", encoding="utf-8")
    staged_path.write_text('<rss version="2.0"/>\n', encoding="utf-8")

    _patch_worker_dependencies(monkeypatch, exit_code=0)

    exit_code = job_runner_module.main(
        [
            "--job-id",
            "1",
            "--execution-id",
            "2",
            "--db-path",
            str(tmp_path / "republisher.db"),
            "--out-dir",
            str(out_dir),
            "--stats-path",
            str(tmp_path / "stats.jsonl"),
        ]
    )

    assert exit_code == 1
    assert public_path.read_text(encoding="utf-8") == "<rss>old</rss>\n"
    assert staged_path.read_text(encoding="utf-8") == '<rss version="2.0"/>\n'


def test_main_does_not_publish_staged_feed_after_failed_crawl(
    monkeypatch: pytest.MonkeyPatch, tmp_path: Path
) -> None:
    out_dir = tmp_path / "out"
    public_path = feed_output_path(out_dir=out_dir, feed_slug="demo")
    staged_path = staged_feed_output_path(out_dir=out_dir, feed_slug="demo")
    public_path.parent.mkdir(parents=True)
    public_path.write_text("<rss>old</rss>\n", encoding="utf-8")
    staged_path.write_text(VALID_FEED, encoding="utf-8")

    _patch_worker_dependencies(monkeypatch, exit_code=1)

    exit_code = job_runner_module.main(
        [
            "--job-id",
            "1",
            "--execution-id",
            "2",
            "--db-path",
            str(tmp_path / "republisher.db"),
            "--out-dir",
            str(out_dir),
            "--stats-path",
            str(tmp_path / "stats.jsonl"),
        ]
    )

    assert exit_code == 1
    assert public_path.read_text(encoding="utf-8") == "<rss>old</rss>\n"
    assert staged_path.read_text(encoding="utf-8") == VALID_FEED


def _patch_worker_dependencies(
    monkeypatch: pytest.MonkeyPatch, *, exit_code: int, run_crawl=None
) -> None:
    monkeypatch.setattr(
        job_runner_module,
        "_load_job_source_config",
        lambda *, db_path, job_id: JobSourceConfig(
            source_name="Demo",
            source_slug="demo",
            source_type="feed",
            spider_arguments={},
            feed_url="https://source.example/feed.rss",
        ),
    )
    monkeypatch.setattr(
        job_runner_module, "load_feed_url", lambda: "https://mirror.example"
    )
    monkeypatch.setattr(
        job_runner_module,
        "CrawlerProcess",
        lambda settings: object(),
    )
    monkeypatch.setattr(
        job_runner_module,
        "_run_crawl",
        run_crawl or (lambda *, process, feed, spider_arguments: exit_code),
    )