"""Integration tests for the v1 playlist API.

Requires a reachable Postgres; skips otherwise.
"""

import asyncio
import os
from collections.abc import AsyncIterator
from pathlib import Path
from typing import Any

import pytest
from app.core.config import get_settings
from app.infrastructure.db import Base, dispose_engine, get_engine, session_scope
from app.infrastructure.db.repositories import (
    SqlAlchemyRefreshTokenRepository,
    SqlAlchemyUserRepository,
)
from asgi_lifespan import LifespanManager
from httpx import ASGITransport, AsyncClient

pytestmark = pytest.mark.asyncio

_db_reachable_cache: bool | None = None


async def _db_reachable() -> bool:
    global _db_reachable_cache
    if _db_reachable_cache is not None:
        return _db_reachable_cache

    from sqlalchemy import text

    try:
        async with asyncio.timeout(3):
            async with get_engine().connect() as conn:
                await conn.execute(text("SELECT 1"))
        _db_reachable_cache = True
    except Exception:
        _db_reachable_cache = False
    return _db_reachable_cache


@pytest.fixture
async def api(tmp_path: Path) -> AsyncIterator[AsyncClient]:
    if not await _db_reachable():
        pytest.skip("Postgres not reachable — integration test skipped.")

    os.environ["MEDIA_PATH"] = str(tmp_path)
    get_settings.cache_clear()

    import app.infrastructure.storage.provider as _storage_provider

    _storage_provider._storage = None

    try:
        async with get_engine().begin() as conn:
            await conn.run_sync(Base.metadata.drop_all)
            await conn.run_sync(Base.metadata.create_all)

        from app.application.user_service import UserService
        from app.core.security import Argon2PasswordHasher

        async with session_scope() as session:
            service = UserService(
                users=SqlAlchemyUserRepository(session),
                refresh_tokens=SqlAlchemyRefreshTokenRepository(session),
                hasher=Argon2PasswordHasher(),
            )
            await service.create_user(username="testuser", password="testpass1", is_superuser=False)
            await service.create_user(
                username="otheruser", password="otherpass1", is_superuser=False
            )

        from app.main import create_app

        app = create_app()
        async with LifespanManager(app):
            transport = ASGITransport(app=app)
            async with AsyncClient(transport=transport, base_url="http://test") as client:
                yield client

        async with get_engine().begin() as conn:
            await conn.run_sync(Base.metadata.drop_all)
        await dispose_engine()
    finally:
        _storage_provider._storage = None
        os.environ.pop("MEDIA_PATH", None)
        get_settings.cache_clear()


async def _login(
    api: AsyncClient, *, username: str = "testuser", password: str = "testpass1"
) -> str:
    resp = await api.post("/api/v1/auth/login", json={"username": username, "password": password})
    assert resp.status_code == 200
    return str(resp.json()["access_token"])


async def _upload(api: AsyncClient, token: str, *, name: str = "song.mp3") -> str:
    # Content must vary per call: uploads dedupe by content hash, so identical
    # bytes across "different" tracks would collapse to a single track_id.
    audio = f"fake audio bytes for playlist test {name}".encode() * 10
    resp = await api.post(
        "/api/v1/upload",
        files={"file": (name, audio, "audio/mpeg")},
        headers={"Authorization": f"Bearer {token}"},
    )
    assert resp.status_code == 200, resp.text
    return str(resp.json()["track_id"])


async def _create_playlist(
    api: AsyncClient, token: str, *, name: str = "My Playlist"
) -> dict[str, Any]:
    resp = await api.post(
        "/api/v1/playlists",
        json={"name": name, "description": "desc"},
        headers={"Authorization": f"Bearer {token}"},
    )
    assert resp.status_code == 201, resp.text
    body: dict[str, Any] = resp.json()
    return body


async def test_playlist_lifecycle(api: AsyncClient) -> None:
    token = await _login(api)
    headers = {"Authorization": f"Bearer {token}"}

    created = await _create_playlist(api, token)
    playlist_id = created["id"]
    assert created["version"] == 1
    assert created["track_count"] == 0

    resp = await api.get("/api/v1/playlists", headers=headers)
    assert resp.status_code == 200, resp.text
    assert any(p["id"] == playlist_id for p in resp.json()["items"])

    resp = await api.get(f"/api/v1/playlists/{playlist_id}", headers=headers)
    assert resp.status_code == 200, resp.text
    assert resp.json()["name"] == "My Playlist"

    resp = await api.patch(
        f"/api/v1/playlists/{playlist_id}",
        json={"name": "Renamed", "description": "new desc"},
        headers=headers,
    )
    assert resp.status_code == 200, resp.text
    body = resp.json()
    assert body["name"] == "Renamed"
    assert body["description"] == "new desc"
    assert body["version"] == 2

    resp = await api.delete(f"/api/v1/playlists/{playlist_id}", headers=headers)
    assert resp.status_code == 204

    resp = await api.get(f"/api/v1/playlists/{playlist_id}", headers=headers)
    assert resp.status_code == 404


async def test_add_track_idempotent(api: AsyncClient) -> None:
    token = await _login(api)
    headers = {"Authorization": f"Bearer {token}"}
    playlist_id = (await _create_playlist(api, token))["id"]
    track_id = await _upload(api, token)

    resp = await api.post(
        f"/api/v1/playlists/{playlist_id}/tracks", json={"track_id": track_id}, headers=headers
    )
    assert resp.status_code == 204

    resp = await api.get(f"/api/v1/playlists/{playlist_id}", headers=headers)
    assert resp.json()["version"] == 2
    assert resp.json()["track_count"] == 1

    resp = await api.get(f"/api/v1/playlists/{playlist_id}/tracks", headers=headers)
    assert resp.status_code == 200, resp.text
    assert [t["id"] for t in resp.json()["items"]] == [track_id]

    # Adding the same track again must be idempotent: 204, no duplicate, no version bump.
    resp = await api.post(
        f"/api/v1/playlists/{playlist_id}/tracks", json={"track_id": track_id}, headers=headers
    )
    assert resp.status_code == 204

    resp = await api.get(f"/api/v1/playlists/{playlist_id}", headers=headers)
    assert resp.json()["version"] == 2
    assert resp.json()["track_count"] == 1


async def test_remove_track(api: AsyncClient) -> None:
    token = await _login(api)
    headers = {"Authorization": f"Bearer {token}"}
    playlist_id = (await _create_playlist(api, token))["id"]
    track_id = await _upload(api, token)

    resp = await api.post(
        f"/api/v1/playlists/{playlist_id}/tracks", json={"track_id": track_id}, headers=headers
    )
    assert resp.status_code == 204

    resp = await api.delete(f"/api/v1/playlists/{playlist_id}/tracks/{track_id}", headers=headers)
    assert resp.status_code == 204

    resp = await api.get(f"/api/v1/playlists/{playlist_id}", headers=headers)
    assert resp.json()["track_count"] == 0
    assert resp.json()["version"] == 3


async def test_reorder_happy_path(api: AsyncClient) -> None:
    token = await _login(api)
    headers = {"Authorization": f"Bearer {token}"}
    playlist_id = (await _create_playlist(api, token))["id"]

    track_ids = []
    for i in range(3):
        track_id = await _upload(api, token, name=f"song{i}.mp3")
        track_ids.append(track_id)
        resp = await api.post(
            f"/api/v1/playlists/{playlist_id}/tracks",
            json={"track_id": track_id},
            headers=headers,
        )
        assert resp.status_code == 204

    reordered = list(reversed(track_ids))
    resp = await api.put(
        f"/api/v1/playlists/{playlist_id}/tracks/reorder",
        json={"track_ids": reordered},
        headers=headers,
    )
    assert resp.status_code == 200, resp.text
    assert resp.json()["version"] == 5  # 1 create + 3 adds + 1 reorder

    resp = await api.get(f"/api/v1/playlists/{playlist_id}/tracks", headers=headers)
    assert resp.status_code == 200, resp.text
    assert [t["id"] for t in resp.json()["items"]] == reordered


async def test_reorder_bad_id_set_returns_422(api: AsyncClient) -> None:
    token = await _login(api)
    headers = {"Authorization": f"Bearer {token}"}
    playlist_id = (await _create_playlist(api, token))["id"]
    track_id = await _upload(api, token)

    resp = await api.post(
        f"/api/v1/playlists/{playlist_id}/tracks", json={"track_id": track_id}, headers=headers
    )
    assert resp.status_code == 204

    # Missing the only member.
    resp = await api.put(
        f"/api/v1/playlists/{playlist_id}/tracks/reorder",
        json={"track_ids": []},
        headers=headers,
    )
    assert resp.status_code == 422

    # Duplicate id.
    resp = await api.put(
        f"/api/v1/playlists/{playlist_id}/tracks/reorder",
        json={"track_ids": [track_id, track_id]},
        headers=headers,
    )
    assert resp.status_code == 422

    # Extra unknown id.
    other_id = await _upload(api, token, name="not-a-member.mp3")
    resp = await api.put(
        f"/api/v1/playlists/{playlist_id}/tracks/reorder",
        json={"track_ids": [track_id, other_id]},
        headers=headers,
    )
    assert resp.status_code == 422


async def test_reorder_by_non_owner_returns_403(api: AsyncClient) -> None:
    token = await _login(api)
    other_token = await _login(api, username="otheruser", password="otherpass1")
    headers = {"Authorization": f"Bearer {token}"}
    playlist_id = (await _create_playlist(api, token))["id"]
    track_id = await _upload(api, token)

    resp = await api.post(
        f"/api/v1/playlists/{playlist_id}/tracks", json={"track_id": track_id}, headers=headers
    )
    assert resp.status_code == 204

    resp = await api.put(
        f"/api/v1/playlists/{playlist_id}/tracks/reorder",
        json={"track_ids": [track_id]},
        headers={"Authorization": f"Bearer {other_token}"},
    )
    assert resp.status_code == 403


async def test_unknown_playlist_returns_404(api: AsyncClient) -> None:
    token = await _login(api)
    headers = {"Authorization": f"Bearer {token}"}
    unknown_id = "00000000-0000-0000-0000-000000000000"
    track_id = await _upload(api, token)

    resp = await api.get(f"/api/v1/playlists/{unknown_id}", headers=headers)
    assert resp.status_code == 404

    resp = await api.patch(f"/api/v1/playlists/{unknown_id}", json={"name": "x"}, headers=headers)
    assert resp.status_code == 404

    resp = await api.delete(f"/api/v1/playlists/{unknown_id}", headers=headers)
    assert resp.status_code == 404

    resp = await api.post(
        f"/api/v1/playlists/{unknown_id}/tracks", json={"track_id": track_id}, headers=headers
    )
    assert resp.status_code == 404