"""GalleryDLService tests — subprocess is mocked so no real gallery-dl runs."""

from types import SimpleNamespace

import pytest

from backend.app.services.gallery_dl import (
    ErrorType,
    GalleryDLService,
    SourceConfig,
)


@pytest.fixture
def gdl(tmp_path):
    return GalleryDLService(
        images_root=tmp_path / "images",
        rate_limit=3.0,
        validate_files=False,
    )


def _proc(stdout="", stderr="", returncode=0):
    return SimpleNamespace(stdout=stdout, stderr=stderr, returncode=returncode)


@pytest.mark.asyncio
async def test_download_happy_path(gdl, monkeypatch):
    out_path = gdl.images_root / "alice" / "patreon" / "post1" / "img.jpg"
    out_path.parent.mkdir(parents=True, exist_ok=True)
    out_path.write_bytes(b"\xff\xd8\xff\xe0" + b"\x00" * 32 + b"\xff\xd9")

    monkeypatch.setattr(
        "backend.app.services.gallery_dl.subprocess.run",
        lambda *a, **k: _proc(stdout=str(out_path) + "\n", returncode=0),
    )
    result = await gdl.download(
        url="https://patreon.com/alice",
        artist_slug="alice",
        platform="patreon",
        source_config=SourceConfig(),
    )
    assert result.success is True
    assert result.files_downloaded == 1
    assert result.error_type is None
    assert str(out_path) in result.written_paths


@pytest.mark.asyncio
async def test_download_no_new_content(gdl, monkeypatch):
    monkeypatch.setattr(
        "backend.app.services.gallery_dl.subprocess.run",
        lambda *a, **k: _proc(stdout="# /images/alice/patreon/old.jpg\n", returncode=0),
    )
    result = await gdl.download(
        url="https://patreon.com/alice", artist_slug="alice", platform="patreon",
        source_config=SourceConfig(),
    )
    assert result.success is True
    assert result.files_downloaded == 0


@pytest.mark.asyncio
async def test_download_auth_error_categorization(gdl, monkeypatch):
    monkeypatch.setattr(
        "backend.app.services.gallery_dl.subprocess.run",
        lambda *a, **k: _proc(
            stdout="", stderr='[patreon][error] "GET /api/foo HTTP/1.1" 401 None\n',
            returncode=1,
        ),
    )
    result = await gdl.download(
        url="https://patreon.com/alice", artist_slug="alice", platform="patreon",
        source_config=SourceConfig(),
    )
    assert result.success is False
    assert result.error_type == ErrorType.AUTH_ERROR


@pytest.mark.asyncio
async def test_download_timeout(gdl, monkeypatch):
    import subprocess as sp

    def _raise(*a, **k):
        raise sp.TimeoutExpired(cmd="gallery-dl", timeout=10)

    monkeypatch.setattr("backend.app.services.gallery_dl.subprocess.run", _raise)
    result = await gdl.download(
        url="https://patreon.com/alice", artist_slug="alice", platform="patreon",
        source_config=SourceConfig(timeout=10),
    )
    assert result.success is False
    assert result.error_type == ErrorType.TIMEOUT
    # Empty-partial timeout: no preserved output and zero files.
    assert result.stdout == ""
    assert result.stderr == ""
    assert result.files_downloaded == 0


@pytest.mark.asyncio
async def test_download_timeout_preserves_partial_output_and_classifies(gdl, monkeypatch):
    """When gallery-dl is killed by timeout but had emitted partial output,
    the DownloadResult preserves stdout/stderr, counts files written so
    far, and promotes to RATE_LIMITED if the partial stderr shows a rate-
    limit pattern (so the platform cooldown kicks in). Without this, the
    operator only sees 'timed out' with no clue whether it was 'lots of
    content', 'stuck retrying', or 'hung silent'."""
    import subprocess as sp

    # Simulate gallery-dl writing two files, then spinning on 429s.
    partial_stdout = (
        "/tmp/images/alice/file_001.jpg\n"
        "/tmp/images/alice/file_002.jpg\n"
    )
    partial_stderr = (
        "[urllib3] 429 Too Many Requests; sleeping 60s\n"
        "[urllib3] 429 Too Many Requests; sleeping 60s\n"
    )

    def _raise(*a, **k):
        raise sp.TimeoutExpired(
            cmd="gallery-dl", timeout=900,
            output=partial_stdout, stderr=partial_stderr,
        )

    monkeypatch.setattr("backend.app.services.gallery_dl.subprocess.run", _raise)
    result = await gdl.download(
        url="https://patreon.com/alice", artist_slug="alice", platform="patreon",
        source_config=SourceConfig(timeout=900),
    )
    assert result.success is False
    # Partial output preserved on the DownloadResult — _phase3_persist
    # writes them into download_event.metadata so the UI can render them.
    assert result.stdout == partial_stdout
    assert result.stderr == partial_stderr
    # Files counted from partial stdout (lines starting with '/').
    assert result.files_downloaded == 2
    # Rate-limit pattern in partial stderr → promoted to RATE_LIMITED so
    # _update_source_health stamps the platform cooldown.
    assert result.error_type == ErrorType.RATE_LIMITED
    assert "Rate-limited" in result.error_message


@pytest.mark.asyncio
async def test_validation_quarantines_truncated_files(tmp_path, monkeypatch):
    gdl = GalleryDLService(
        images_root=tmp_path / "images", rate_limit=3.0, validate_files=True,
    )
    bad = gdl.images_root / "alice" / "patreon" / "post" / "bad.jpg"
    bad.parent.mkdir(parents=True, exist_ok=True)
    bad.write_bytes(b"\xff\xd8\xff" + b"\x00" * 100)  # SOI but no EOI

    monkeypatch.setattr(
        "backend.app.services.gallery_dl.subprocess.run",
        lambda *a, **k: _proc(stdout=str(bad) + "\n", returncode=0),
    )
    result = await gdl.download(
        url="https://patreon.com/alice", artist_slug="alice", platform="patreon",
        source_config=SourceConfig(),
    )
    assert result.files_quarantined == 1
    assert len(result.quarantined_paths) == 1
    assert not bad.exists()
    assert result.error_type == ErrorType.VALIDATION_FAILED


def test_compute_run_stats(gdl):
    stats = gdl._compute_run_stats(
        return_code=0,
        stdout="/path/a.jpg\n/path/b.jpg\n# /path/c.jpg\n",
        stderr="[patreon][warning] foo\n[patreon][download][error] failed to download /x\n",
    )
    assert stats["downloaded_count"] == 2
    assert stats["skipped_count"] == 1
    assert stats["warning_count"] >= 1
    assert stats["per_item_failures"] == 1


def test_extract_errors_warnings(gdl):
    stderr = (
        "[patreon][debug] foo\n[patreon][error] bar\n"
        "[urllib3][debug] baz\n[patreon][warning] qux\n"
    )
    result = gdl._extract_errors_warnings(stderr)
    assert "[error]" in result
    assert "[warning]" in result
    assert "[debug]" not in result


def test_truncate_log_caps_large_text(gdl):
    huge = "line\n" * 200_000
    result = gdl._truncate_log(huge, max_bytes=10_000)
    assert len(result.encode()) < 11_000
    assert "lines elided" in result


def test_truncate_log_passes_short_text(gdl):
    text = "small\n"
    assert gdl._truncate_log(text) == text