from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from fastapi.staticfiles import StaticFiles
from fastapi.responses import FileResponse
import os

from backend.core.config import settings
from backend.api.endpoints import playlists, search, stream, lyrics

app = FastAPI(title=settings.APP_NAME)

# CORS setup
app.add_middleware(
    CORSMiddleware,
    allow_origins=settings.BACKEND_CORS_ORIGINS,
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# Include Routers
app.include_router(playlists.router, prefix=f"{settings.API_V1_STR}", tags=["playlists"])
app.include_router(search.router, prefix=f"{settings.API_V1_STR}", tags=["search"])
app.include_router(stream.router, prefix=f"{settings.API_V1_STR}", tags=["stream"])
app.include_router(lyrics.router, prefix=f"{settings.API_V1_STR}", tags=["lyrics"])

# Serve Static Frontend (Production Mode)
if settings.CACHE_DIR.parent.name == "backend":
    # assuming running from root
    STATIC_DIR = "static"
else:
    STATIC_DIR = "../static"

if os.path.exists(STATIC_DIR):
    app.mount("/_next", StaticFiles(directory=os.path.join(STATIC_DIR, "_next")), name="next_assets")
    
    @app.get("/{full_path:path}")
    async def serve_spa(full_path: str):
        file_path = os.path.join(STATIC_DIR, full_path)
        if os.path.isfile(file_path):
            return FileResponse(file_path)
        
        index_path = os.path.join(STATIC_DIR, "index.html")
        if os.path.exists(index_path):
            return FileResponse(index_path)
        
        return {"error": "Frontend not found"}
else:
    @app.get("/")
    def read_root():
        return {"message": "Spotify Clone Backend Running (Frontend not built/mounted)"}

@app.get("/health")
def health_check():
    return {"status": "ok"}