from fastapi import Request
from starlette.middleware.base import BaseHTTPMiddleware
from ..billing.usage_tracker import UsageTracker


class UsageTrackingMiddleware(BaseHTTPMiddleware):
    async def dispatch(self, request: Request, call_next):
        response = await call_next(request)

        if hasattr(request.state, "user") and request.state.user:
            user = request.state.user

            if (
                request.method in ["POST", "PUT"]
                and "/files/upload" in request.url.path
            ):
                content_length = response.headers.get("content-length")
                if content_length:
                    await UsageTracker.track_bandwidth(
                        user=user,
                        amount_bytes=int(content_length),
                        direction="up",
                        metadata={"path": request.url.path},
                    )

            elif request.method == "GET" and "/files/download" in request.url.path:
                content_length = response.headers.get("content-length")
                if content_length:
                    await UsageTracker.track_bandwidth(
                        user=user,
                        amount_bytes=int(content_length),
                        direction="down",
                        metadata={"path": request.url.path},
                    )

        return response