import os
from contextlib import asynccontextmanager

from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import FileResponse

from app.core.config import settings
from app.core.database import connect_to_mongo, close_mongo_connection
from app.api.routes import health, projects


@asynccontextmanager
async def lifespan(app: FastAPI):
    await connect_to_mongo()
    yield
    await close_mongo_connection()


app = FastAPI(
    title="RFCP Backend API",
    description="RF Coverage Planning Backend",
    version="1.1.0",
    lifespan=lifespan,
)

# CORS for frontend
app.add_middleware(
    CORSMiddleware,
    allow_origins=["https://rfcp.eliah.one", "http://localhost:5173"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# Routes
app.include_router(health.router, prefix="/api/health", tags=["health"])
app.include_router(projects.router, prefix="/api/projects", tags=["projects"])


@app.get("/")
async def root():
    return {"message": "RFCP Backend API", "version": "1.1.0"}


@app.get("/api/terrain/{region}")
async def get_terrain(region: str):
    """Serve SRTM terrain .hgt files."""
    terrain_path = os.path.join(settings.TERRAIN_DATA_DIR, f"{region}.hgt")
    if os.path.exists(terrain_path):
        return FileResponse(terrain_path)
    return {"error": "Region not found"}, 404


if __name__ == "__main__":
    import uvicorn

    uvicorn.run(app, host="0.0.0.0", port=8090)