"""Audio loading and status endpoints."""
import asyncio
from pathlib import Path
from fastapi import APIRouter, HTTPException, Request
from pydantic import BaseModel

router = APIRouter()

SUPPORTED_EXTENSIONS = {".mp3", ".wav", ".flac", ".ogg"}


class LoadRequest(BaseModel):
    path: str


class AudioState(BaseModel):
    position: float
    paused: bool
    duration: float | None
    loaded: bool
    file: str | None


@router.post("/load")
async def load_audio(req: LoadRequest, request: Request):
    """Load an audio file by server path (AUD-01). YouTube URL deferred to Phase 6 (AUD-02 stub)."""
    engine = request.app.state.engine
    if engine is None:
        raise HTTPException(status_code=503, detail="Audio engine not ready")

    p = Path(req.path)
    if not p.exists():
        raise HTTPException(status_code=404, detail=f"File not found: {req.path}")
    if p.suffix.lower() not in SUPPORTED_EXTENSIONS:
        raise HTTPException(status_code=400, detail=f"Unsupported format: {p.suffix}. Supported: {', '.join(sorted(SUPPORTED_EXTENSIONS))}")

    await asyncio.to_thread(engine.load, req.path)
    return {"status": "loaded", "path": req.path}


@router.get("/state")
async def get_audio_state(request: Request):
    """Get current audio playback state."""
    engine = request.app.state.engine
    if engine is None:
        raise HTTPException(status_code=503, detail="Audio engine not ready")
    return engine.get_state()