"""
live.py — Live playliste-status til storskærm/mobil.
Appen pusher status hertil, storskærmen poller hvert 5 sek.
"""
from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy.orm import Session
from pydantic import BaseModel
from typing import Optional
import json
from datetime import datetime, timezone

from app.core.database import get_db
from app.core.security import get_current_user
from app.models import User, Project

router = APIRouter(prefix="/live", tags=["live"])

# In-memory cache: server_id → {songs, updated_at}
_live_cache: dict = {}


class SongStatus(BaseModel):
    title:       str
    artist:      str = ""
    status:      str = "pending"
    position:    int
    dance:       str = ""
    duration:    int = 0
    is_workshop: bool = False


class LiveStatus(BaseModel):
    songs: list[SongStatus]


# ── Push fra app ──────────────────────────────────────────────────────────────

@router.post("/{project_id}/status")
def push_status(
    project_id: str,
    data: LiveStatus,
    db: Session = Depends(get_db),
    me: User = Depends(get_current_user),
):
    """App pusher aktuel playliste-status."""
    p = db.query(Project).filter_by(id=project_id, owner_id=me.id).first()
    if not p:
        raise HTTPException(404, "Playliste ikke fundet")

    _live_cache[project_id] = {
        "name":       p.name,
        "songs":      [s.model_dump() for s in data.songs],
        "updated_at": datetime.now(timezone.utc).isoformat(),
    }
    return {"status": "ok"}


# ── Pull til storskærm ────────────────────────────────────────────────────────

@router.get("/{project_id}")
def get_live_status(project_id: str, db: Session = Depends(get_db)):
    """Storskærm poller dette endpoint — ingen login krævet."""
    # Tjek at playlisten eksisterer og er tilgængelig
    p = db.query(Project).filter_by(id=project_id).first()
    if not p:
        raise HTTPException(404, "Playliste ikke fundet")

    cached = _live_cache.get(project_id)
    if cached:
        return cached

    # Ingen live data endnu — returner statisk data fra DB
    from app.models import ProjectSong, Song
    songs = []
    for ps in sorted(p.project_songs, key=lambda x: x.position):
        song = db.query(Song).filter_by(id=ps.song_id).first()
        if not song:
            continue
        songs.append({
            "title":    song.title,
            "artist":   song.artist,
            "status":   ps.status or "pending",
            "position": ps.position,
            "dance":    ps.dance_override or "",
            "duration": song.duration_sec or 0,
        })

    return {
        "name":       p.name,
        "songs":      songs,
        "updated_at": None,
    }


# ── Liste over aktive live-playlister ─────────────────────────────────────────

@router.get("/")
def list_live(db: Session = Depends(get_db)):
    """Hvilke playlister har aktiv live-data?"""
    result = []
    for pid, data in _live_cache.items():
        playing = next((s for s in data["songs"] if s["status"] == "playing"), None)
        result.append({
            "id":         pid,
            "name":       data["name"],
            "updated_at": data["updated_at"],
            "now_playing": playing["title"] if playing else None,
        })
    return result