from datetime import datetime, timezone

import pytest
from fastapi.testclient import TestClient

from app.core.auth_dependency import require_session
from app.db import get_db
from app.main import app
from app.models.category import Category
from app.models.channel import Channel
from app.models.channel_category import channel_categories
from app.models.video import Video


@pytest.fixture
def client(db_session):
    def _get_db_override():
        yield db_session

    app.dependency_overrides[get_db] = _get_db_override
    app.dependency_overrides[require_session] = lambda: None
    # Deliberately not using `with TestClient(app)`: that runs the app's
    # lifespan, which would try to reach the real MeTube instance and DB
    # (see AGENTS.md: MeTube network calls in tests must be opt-in only).
    yield TestClient(app)
    del app.dependency_overrides[get_db]
    del app.dependency_overrides[require_session]


def test_get_video_by_youtube_id(client, db_session):
    channel = Channel(youtube_channel_id="chanA", title="Channel A", subscribed=True)
    db_session.add(channel)
    db_session.commit()

    category = Category(name="Linux", slug="linux", sort_order=0)
    db_session.add(category)
    db_session.commit()
    db_session.execute(channel_categories.insert().values(channel_id=channel.id, category_id=category.id))
    db_session.commit()

    video = Video(
        youtube_video_id="vid1",
        channel_id=channel.id,
        title="Video One",
        description="desc",
        published_at=datetime(2026, 9, 10, tzinfo=timezone.utc),
        duration_seconds=125,
        youtube_url="https://www.youtube.com/watch?v=vid1",
    )
    db_session.add(video)
    db_session.commit()

    resp = client.get("/api/videos/vid1")
    assert resp.status_code == 200
    body = resp.json()
    assert body["youtube_video_id"] == "vid1"
    assert body["channel"]["id"] == channel.id
    assert body["categories"] == [{"id": category.id, "name": "Linux"}]
    assert body["local"]["available"] is False


def test_get_video_not_found(client):
    resp = client.get("/api/videos/missing")
    assert resp.status_code == 404


def _seed_single_video(db_session, youtube_video_id="vid1"):
    channel = Channel(youtube_channel_id="chanA", title="Channel A", subscribed=True)
    db_session.add(channel)
    db_session.commit()

    video = Video(
        youtube_video_id=youtube_video_id,
        channel_id=channel.id,
        title="Video One",
        published_at=datetime(2026, 9, 10, tzinfo=timezone.utc),
        youtube_url=f"https://www.youtube.com/watch?v={youtube_video_id}",
    )
    db_session.add(video)
    db_session.commit()
    db_session.refresh(video)
    return video


def test_download_video_enqueues(client, db_session, monkeypatch):
    video = _seed_single_video(db_session)
    monkeypatch.setattr(
        "app.services.metube_client.MeTubeClient.enqueue_video", lambda self, u, p: {"status": "ok"}
    )

    resp = client.post(f"/api/videos/{video.youtube_video_id}/download")

    assert resp.status_code == 200
    assert resp.json()["status"] == "queued"


def test_download_video_metube_rejects(client, db_session, monkeypatch):
    video = _seed_single_video(db_session)
    monkeypatch.setattr(
        "app.services.metube_client.MeTubeClient.enqueue_video",
        lambda self, u, p: {"status": "error", "msg": "bad url"},
    )

    resp = client.post(f"/api/videos/{video.youtube_video_id}/download")

    assert resp.status_code == 502


def test_download_video_second_click_returns_same_job(client, db_session, monkeypatch):
    video = _seed_single_video(db_session)
    monkeypatch.setattr(
        "app.services.metube_client.MeTubeClient.enqueue_video", lambda self, u, p: {"status": "ok"}
    )

    r1 = client.post(f"/api/videos/{video.youtube_video_id}/download").json()
    r2 = client.post(f"/api/videos/{video.youtube_video_id}/download").json()

    assert r1["requested_at"] == r2["requested_at"]

    from app.models.download_job import DownloadJob

    assert db_session.query(DownloadJob).count() == 1


def test_download_status_not_downloaded(client, db_session):
    video = _seed_single_video(db_session)
    resp = client.get(f"/api/videos/{video.youtube_video_id}/download-status")
    assert resp.json()["status"] == "not_downloaded"


def test_recheck_local_downgrades_to_unknown_when_media_missing(client, db_session, monkeypatch):
    from app.models.download_job import DownloadJob

    video = _seed_single_video(db_session)
    job = DownloadJob(video_id=video.id, status="completed", media_url="http://metube.local/download/f.mp4")
    db_session.add(job)
    db_session.commit()

    monkeypatch.setattr("app.services.metube_client.MeTubeClient.check_media", lambda self, url: False)

    resp = client.post(f"/api/videos/{video.youtube_video_id}/recheck-local")

    assert resp.status_code == 200
    assert resp.json()["status"] == "unknown"


def test_recheck_local_keeps_completed_when_media_reachable(client, db_session, monkeypatch):
    from app.models.download_job import DownloadJob

    video = _seed_single_video(db_session)
    job = DownloadJob(video_id=video.id, status="completed", media_url="http://metube.local/download/f.mp4")
    db_session.add(job)
    db_session.commit()

    monkeypatch.setattr("app.services.metube_client.MeTubeClient.check_media", lambda self, url: True)

    resp = client.post(f"/api/videos/{video.youtube_video_id}/recheck-local")

    assert resp.status_code == 200
    assert resp.json()["status"] == "completed"


def test_delete_download_requires_completed_job(client, db_session):
    video = _seed_single_video(db_session)
    resp = client.delete(f"/api/videos/{video.youtube_video_id}/download")
    assert resp.status_code == 400


def test_delete_download_success(client, db_session, monkeypatch):
    from app.models.download_job import DownloadJob

    video = _seed_single_video(db_session)
    job = DownloadJob(
        video_id=video.id,
        status="completed",
        metube_job_id="vid1.vid1",
        media_url="http://metube.local/download/f.mp4",
    )
    db_session.add(job)
    db_session.commit()

    calls = {}
    monkeypatch.setattr(
        "app.services.metube_client.MeTubeClient.delete_download",
        lambda self, metube_job_id: calls.setdefault("id", metube_job_id) or {"status": "ok"},
    )

    resp = client.delete(f"/api/videos/{video.youtube_video_id}/download")

    assert resp.status_code == 200
    assert resp.json()["status"] == "deleted"
    assert resp.json()["media_url"] is None
    assert calls["id"] == "vid1.vid1"

    db_session.refresh(job)
    assert job.status == "deleted"
    assert job.media_url is None