"""tests for track comment api endpoints."""

from collections.abc import Generator
from unittest.mock import patch

import pytest
from fastapi import FastAPI
from httpx import ASGITransport, AsyncClient
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession

from backend._internal import Session, require_auth
from backend.main import app
from backend.models import Artist, Track, TrackComment, UserPreferences


class MockSession(Session):
    """mock session for auth bypass in tests."""

    def __init__(self, did: str = "did:test:commenter123"):
        self.did = did
        self.handle = "commenter.bsky.social"
        self.session_id = "test_session_id"
        self.access_token = "test_token"
        self.refresh_token = "test_refresh"
        self.oauth_session = {
            "did": did,
            "handle": "commenter.bsky.social",
            "pds_url": "https://test.pds",
            "authserver_iss": "https://auth.test",
            "scope": "atproto transition:generic",
            "access_token": "test_token",
            "refresh_token": "test_refresh",
            "dpop_private_key_pem": "fake_key",
            "dpop_authserver_nonce": "",
            "dpop_pds_nonce": "",
        }


@pytest.fixture
async def test_artist(db_session: AsyncSession) -> Artist:
    """create a test artist."""
    artist = Artist(
        did="did:plc:artist123",
        handle="artist.bsky.social",
        display_name="Test Artist",
    )
    db_session.add(artist)
    await db_session.commit()
    return artist


@pytest.fixture
async def test_track(db_session: AsyncSession, test_artist: Artist) -> Track:
    """create a test track."""
    track = Track(
        title="Test Track",
        artist_did=test_artist.did,
        file_id="test123",
        file_type="mp3",
        extra={"duration": 180},
        atproto_record_uri="at://did:plc:artist123/fm.plyr.track/test123",
        atproto_record_cid="bafytest123",
    )
    db_session.add(track)
    await db_session.commit()
    await db_session.refresh(track)
    return track


@pytest.fixture
async def artist_with_comments_enabled(
    db_session: AsyncSession, test_artist: Artist
) -> UserPreferences:
    """create user preferences with comments enabled."""
    prefs = UserPreferences(
        did=test_artist.did,
        allow_comments=True,
    )
    db_session.add(prefs)
    await db_session.commit()
    return prefs


@pytest.fixture
async def commenter_artist(db_session: AsyncSession) -> Artist:
    """create the artist record for the commenter."""
    artist = Artist(
        did="did:test:commenter123",
        handle="commenter.bsky.social",
        display_name="Test Commenter",
    )
    db_session.add(artist)
    await db_session.commit()
    return artist


@pytest.fixture
def test_app(db_session: AsyncSession) -> Generator[FastAPI, None, None]:
    """create test app with mocked auth."""

    async def mock_require_auth() -> Session:
        return MockSession()

    app.dependency_overrides[require_auth] = mock_require_auth
    yield app
    app.dependency_overrides.clear()


async def test_get_comments_returns_empty_when_disabled(
    test_app: FastAPI, db_session: AsyncSession, test_track: Track
):
    """test that comments endpoint returns empty list when artist has comments disabled."""
    async with AsyncClient(
        transport=ASGITransport(app=test_app), base_url="http://test"
    ) as client:
        response = await client.get(f"/tracks/{test_track.id}/comments")

    assert response.status_code == 200
    data = response.json()
    assert data["comments"] == []
    assert data["comments_enabled"] is False


async def test_get_comments_returns_list_when_enabled(
    test_app: FastAPI,
    db_session: AsyncSession,
    test_track: Track,
    artist_with_comments_enabled: UserPreferences,
):
    """test that comments endpoint returns comments when enabled."""
    # add a test comment directly to DB
    comment = TrackComment(
        track_id=test_track.id,
        user_did="did:test:commenter123",
        text="great track!",
        timestamp_ms=45000,
        atproto_comment_uri="at://did:test:commenter123/fm.plyr.comment/abc",
    )
    db_session.add(comment)
    await db_session.commit()

    async with AsyncClient(
        transport=ASGITransport(app=test_app), base_url="http://test"
    ) as client:
        response = await client.get(f"/tracks/{test_track.id}/comments")

    assert response.status_code == 200
    data = response.json()
    assert data["comments_enabled"] is True
    assert len(data["comments"]) == 1
    assert data["comments"][0]["text"] == "great track!"
    assert data["comments"][0]["timestamp_ms"] == 45000


async def test_create_comment_fails_when_comments_disabled(
    test_app: FastAPI, db_session: AsyncSession, test_track: Track
):
    """test that creating a comment fails when artist has comments disabled."""
    async with AsyncClient(
        transport=ASGITransport(app=test_app), base_url="http://test"
    ) as client:
        response = await client.post(
            f"/tracks/{test_track.id}/comments",
            json={"text": "hello", "timestamp_ms": 1000},
        )

    assert response.status_code == 403
    assert "disabled" in response.json()["detail"].lower()


async def test_create_comment_success(
    test_app: FastAPI,
    db_session: AsyncSession,
    test_track: Track,
    artist_with_comments_enabled: UserPreferences,
    commenter_artist: Artist,
):
    """test successful comment creation schedules background task."""
    with patch(
        "backend.api.tracks.comments.schedule_pds_create_comment"
    ) as mock_schedule:
        async with AsyncClient(
            transport=ASGITransport(app=test_app), base_url="http://test"
        ) as client:
            response = await client.post(
                f"/tracks/{test_track.id}/comments",
                json={"text": "awesome drop at this moment!", "timestamp_ms": 30000},
            )

    assert response.status_code == 200
    data = response.json()
    assert data["text"] == "awesome drop at this moment!"
    assert data["timestamp_ms"] == 30000
    assert data["user_did"] == "did:test:commenter123"

    # verify background task was scheduled
    mock_schedule.assert_called_once()
    call_kwargs = mock_schedule.call_args.kwargs
    assert call_kwargs["subject_uri"] == test_track.atproto_record_uri
    assert call_kwargs["subject_cid"] == test_track.atproto_record_cid
    assert call_kwargs["text"] == "awesome drop at this moment!"
    assert call_kwargs["timestamp_ms"] == 30000

    # verify DB entry exists (created immediately, before PDS)
    result = await db_session.execute(
        select(TrackComment).where(TrackComment.track_id == test_track.id)
    )
    comment = result.scalar_one()
    assert comment.text == "awesome drop at this moment!"
    assert comment.timestamp_ms == 30000
    # atproto_comment_uri is None initially - will be set by background task
    assert comment.atproto_comment_uri is None


async def test_create_comment_db_entry_has_correct_comment_id(
    test_app: FastAPI,
    db_session: AsyncSession,
    test_track: Track,
    artist_with_comments_enabled: UserPreferences,
    commenter_artist: Artist,
):
    """test that the comment_id passed to background task matches the DB record."""
    with patch(
        "backend.api.tracks.comments.schedule_pds_create_comment"
    ) as mock_schedule:
        async with AsyncClient(
            transport=ASGITransport(app=test_app), base_url="http://test"
        ) as client:
            await client.post(
                f"/tracks/{test_track.id}/comments",
                json={"text": "test comment", "timestamp_ms": 5000},
            )

    # get the comment_id from the scheduled call
    call_kwargs = mock_schedule.call_args.kwargs
    scheduled_comment_id = call_kwargs["comment_id"]

    # verify it matches the DB record
    result = await db_session.execute(
        select(TrackComment).where(TrackComment.track_id == test_track.id)
    )
    comment = result.scalar_one()
    assert comment.id == scheduled_comment_id


async def test_create_comment_respects_limit(
    test_app: FastAPI,
    db_session: AsyncSession,
    test_track: Track,
    artist_with_comments_enabled: UserPreferences,
):
    """test that comment limit is enforced."""
    # add 20 comments (the limit)
    for i in range(20):
        comment = TrackComment(
            track_id=test_track.id,
            user_did=f"did:test:user{i}",
            text=f"comment {i}",
            timestamp_ms=i * 1000,
            atproto_comment_uri=f"at://did:test:user{i}/fm.plyr.comment/{i}",
        )
        db_session.add(comment)
    await db_session.commit()

    # try to add 21st comment
    async with AsyncClient(
        transport=ASGITransport(app=test_app), base_url="http://test"
    ) as client:
        response = await client.post(
            f"/tracks/{test_track.id}/comments",
            json={"text": "one more", "timestamp_ms": 21000},
        )

    assert response.status_code == 400
    assert "maximum" in response.json()["detail"].lower()


async def test_comments_ordered_by_timestamp(
    test_app: FastAPI,
    db_session: AsyncSession,
    test_track: Track,
    artist_with_comments_enabled: UserPreferences,
):
    """test that comments are returned ordered by timestamp."""
    # add comments out of order
    for timestamp in [30000, 10000, 50000, 20000]:
        comment = TrackComment(
            track_id=test_track.id,
            user_did="did:test:user",
            text=f"at {timestamp}",
            timestamp_ms=timestamp,
            atproto_comment_uri=f"at://did:test:user/fm.plyr.comment/{timestamp}",
        )
        db_session.add(comment)
    await db_session.commit()

    async with AsyncClient(
        transport=ASGITransport(app=test_app), base_url="http://test"
    ) as client:
        response = await client.get(f"/tracks/{test_track.id}/comments")

    assert response.status_code == 200
    comments = response.json()["comments"]
    timestamps = [c["timestamp_ms"] for c in comments]
    assert timestamps == [10000, 20000, 30000, 50000]


async def test_get_comments_track_not_found(test_app: FastAPI):
    """test that 404 is returned for non-existent track."""
    async with AsyncClient(
        transport=ASGITransport(app=test_app), base_url="http://test"
    ) as client:
        response = await client.get("/tracks/99999/comments")

    assert response.status_code == 404


async def test_edit_comment_success(
    test_app: FastAPI,
    db_session: AsyncSession,
    test_track: Track,
    artist_with_comments_enabled: UserPreferences,
    commenter_artist: Artist,
):
    """test that comment owner can edit their comment and background task is scheduled."""
    comment = TrackComment(
        track_id=test_track.id,
        user_did="did:test:commenter123",
        text="original text",
        timestamp_ms=5000,
        atproto_comment_uri="at://did:test:commenter123/fm.plyr.comment/edit1",
    )
    db_session.add(comment)
    await db_session.commit()
    await db_session.refresh(comment)

    with patch(
        "backend.api.tracks.comments.schedule_pds_update_comment"
    ) as mock_schedule:
        async with AsyncClient(
            transport=ASGITransport(app=test_app), base_url="http://test"
        ) as client:
            response = await client.patch(
                f"/tracks/comments/{comment.id}",
                json={"text": "edited text"},
            )

    assert response.status_code == 200
    data = response.json()
    assert data["text"] == "edited text"
    assert data["updated_at"] is not None

    # verify background task was scheduled
    mock_schedule.assert_called_once()
    call_kwargs = mock_schedule.call_args.kwargs
    assert call_kwargs["comment_uri"] == comment.atproto_comment_uri
    assert call_kwargs["subject_uri"] == test_track.atproto_record_uri
    assert call_kwargs["subject_cid"] == test_track.atproto_record_cid
    assert call_kwargs["text"] == "edited text"
    assert call_kwargs["timestamp_ms"] == 5000


async def test_edit_comment_without_atproto_uri(
    test_app: FastAPI,
    db_session: AsyncSession,
    test_track: Track,
    artist_with_comments_enabled: UserPreferences,
    commenter_artist: Artist,
):
    """test that editing a comment without ATProto URI doesn't schedule update."""
    # comment without ATProto URI (e.g., background task hasn't run yet)
    comment = TrackComment(
        track_id=test_track.id,
        user_did="did:test:commenter123",
        text="original text",
        timestamp_ms=5000,
        atproto_comment_uri=None,
    )
    db_session.add(comment)
    await db_session.commit()
    await db_session.refresh(comment)

    with patch(
        "backend.api.tracks.comments.schedule_pds_update_comment"
    ) as mock_schedule:
        async with AsyncClient(
            transport=ASGITransport(app=test_app), base_url="http://test"
        ) as client:
            response = await client.patch(
                f"/tracks/comments/{comment.id}",
                json={"text": "edited text"},
            )

    assert response.status_code == 200
    data = response.json()
    assert data["text"] == "edited text"

    # no PDS update should be scheduled since there's no ATProto record
    mock_schedule.assert_not_called()


async def test_edit_comment_forbidden_for_other_user(
    test_app: FastAPI,
    db_session: AsyncSession,
    test_track: Track,
    artist_with_comments_enabled: UserPreferences,
):
    """test that non-owner cannot edit comment."""
    comment = TrackComment(
        track_id=test_track.id,
        user_did="did:plc:other",
        text="someone else's comment",
        timestamp_ms=5000,
        atproto_comment_uri="at://did:plc:other/fm.plyr.comment/other1",
    )
    db_session.add(comment)
    await db_session.commit()
    await db_session.refresh(comment)

    async with AsyncClient(
        transport=ASGITransport(app=test_app), base_url="http://test"
    ) as client:
        response = await client.patch(
            f"/tracks/comments/{comment.id}",
            json={"text": "trying to edit"},
        )

    assert response.status_code == 403
    assert "own" in response.json()["detail"]


async def test_delete_comment_success(
    test_app: FastAPI,
    db_session: AsyncSession,
    test_track: Track,
    artist_with_comments_enabled: UserPreferences,
    commenter_artist: Artist,
):
    """test that comment owner can delete their comment and background task is scheduled."""
    comment = TrackComment(
        track_id=test_track.id,
        user_did="did:test:commenter123",
        text="to be deleted",
        timestamp_ms=5000,
        atproto_comment_uri="at://did:test:commenter123/fm.plyr.comment/del1",
    )
    db_session.add(comment)
    await db_session.commit()
    await db_session.refresh(comment)
    comment_id = comment.id

    with patch(
        "backend.api.tracks.comments.schedule_pds_delete_comment"
    ) as mock_schedule:
        async with AsyncClient(
            transport=ASGITransport(app=test_app), base_url="http://test"
        ) as client:
            response = await client.delete(f"/tracks/comments/{comment_id}")

    assert response.status_code == 200
    assert response.json()["deleted"] is True

    # verify background task was scheduled with correct URI
    mock_schedule.assert_called_once()
    call_kwargs = mock_schedule.call_args.kwargs
    assert (
        call_kwargs["comment_uri"] == "at://did:test:commenter123/fm.plyr.comment/del1"
    )

    # verify DB entry is gone (deleted immediately, before PDS)
    result = await db_session.execute(
        select(TrackComment).where(TrackComment.id == comment_id)
    )
    assert result.scalar_one_or_none() is None


async def test_delete_comment_without_atproto_uri(
    test_app: FastAPI,
    db_session: AsyncSession,
    test_track: Track,
    artist_with_comments_enabled: UserPreferences,
    commenter_artist: Artist,
):
    """test that deleting a comment without ATProto URI doesn't schedule deletion."""
    # comment without ATProto URI (e.g., background task hasn't run yet)
    comment = TrackComment(
        track_id=test_track.id,
        user_did="did:test:commenter123",
        text="to be deleted",
        timestamp_ms=5000,
        atproto_comment_uri=None,
    )
    db_session.add(comment)
    await db_session.commit()
    await db_session.refresh(comment)
    comment_id = comment.id

    with patch(
        "backend.api.tracks.comments.schedule_pds_delete_comment"
    ) as mock_schedule:
        async with AsyncClient(
            transport=ASGITransport(app=test_app), base_url="http://test"
        ) as client:
            response = await client.delete(f"/tracks/comments/{comment_id}")

    assert response.status_code == 200
    assert response.json()["deleted"] is True

    # no PDS deletion should be scheduled since there's no ATProto record
    mock_schedule.assert_not_called()

    # verify DB entry is still gone
    result = await db_session.execute(
        select(TrackComment).where(TrackComment.id == comment_id)
    )
    assert result.scalar_one_or_none() is None