package mxgateway

import (
	"context"

	"google.golang.org/grpc"
	"google.golang.org/grpc/metadata"
)

const authorizationHeader = "authorization"

func unaryAuthInterceptor(apiKey string) grpc.UnaryClientInterceptor {
	return func(ctx context.Context, method string, req, reply any, cc *grpc.ClientConn, invoker grpc.UnaryInvoker, opts ...grpc.CallOption) error {
		return invoker(authContext(ctx, apiKey), method, req, reply, cc, opts...)
	}
}

func streamAuthInterceptor(apiKey string) grpc.StreamClientInterceptor {
	return func(ctx context.Context, desc *grpc.StreamDesc, cc *grpc.ClientConn, method string, streamer grpc.Streamer, opts ...grpc.CallOption) (grpc.ClientStream, error) {
		return streamer(authContext(ctx, apiKey), desc, cc, method, opts...)
	}
}

func authContext(ctx context.Context, apiKey string) context.Context {
	if apiKey == "" {
		return ctx
	}

	return metadata.AppendToOutgoingContext(ctx, authorizationHeader, "Bearer "+apiKey)
}
