from pathlib import Path

import uvicorn
from fastapi import FastAPI, HTTPException
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import Response
from fastapi.staticfiles import StaticFiles

from backend.audio_export import export_keyboard_audio
from backend.models import ExportRequest

ROOT = Path(__file__).resolve().parent.parent
DIST = ROOT / "frontend" / "dist"
ASSETS = ROOT / "assets"

app = FastAPI(title="sfxkeeb")

app.add_middleware(
    CORSMiddleware,
    allow_origins=["http://localhost:5173", "http://127.0.0.1:5173"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

if ASSETS.exists():
    app.mount("/assets", StaticFiles(directory=ASSETS), name="assets")


@app.post("/api/export/audio")
def export_audio(request: ExportRequest) -> Response:
    try:
        wav_bytes = export_keyboard_audio(request)
    except FileNotFoundError as exc:
        raise HTTPException(status_code=500, detail=str(exc)) from exc
    except Exception as exc:
        raise HTTPException(status_code=500, detail=f"Export failed: {exc}") from exc

    return Response(
        content=wav_bytes,
        media_type="audio/wav",
        headers={"Content-Disposition": 'attachment; filename="keyboard_track.wav"'},
    )


@app.get("/api/health")
def health() -> dict[str, str]:
    return {"status": "ok"}


if DIST.exists():
    app.mount("/", StaticFiles(directory=DIST, html=True), name="frontend")


def run() -> None:
    uvicorn.run("backend.main:app", host="127.0.0.1", port=8000, reload=True)