package v1

import (
	"context"
	"log/slog"
	"time"

	"buf.build/gen/go/grpc/grpc/connectrpc/go/grpc/health/v1/healthv1connect"
	v1 "buf.build/gen/go/grpc/grpc/protocolbuffers/go/grpc/health/v1"
	"connectrpc.com/connect"
)

const healthCheckInterval = 100 * time.Millisecond

var _ healthv1connect.HealthHandler = (*healthServer)(nil)

func NewHealthServer(logger *slog.Logger) healthv1connect.HealthHandler {
	return &healthServer{
		logger: logger,
	}
}

type healthServer struct {
	logger *slog.Logger
}

func (h *healthServer) Check(context.Context, *connect.Request[v1.HealthCheckRequest]) (*connect.Response[v1.HealthCheckResponse], error) {
	resp := &v1.HealthCheckResponse{
		Status: v1.HealthCheckResponse_SERVING,
	}

	return connect.NewResponse(resp), nil
}

func (h *healthServer) Watch(ctx context.Context, _ *connect.Request[v1.HealthCheckRequest], stream *connect.ServerStream[v1.HealthCheckResponse]) error {
	ticker := time.NewTicker(healthCheckInterval)

	defer ticker.Stop()

	select {
	case <-ticker.C:
		err := stream.Send(&v1.HealthCheckResponse{
			Status: v1.HealthCheckResponse_SERVING,
		})
		if err != nil {
			h.logger.Error("Failed to send response", slog.String("err", err.Error()))
		}
		return nil
	case <-ctx.Done():
		return nil
	}
}