package auth

import (
	"context"
	"slowwild/internal/constants"

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

// GetUserIDFromContext 从context中获取用户ID
func GetUserIDFromContext(ctx context.Context) (string, bool) {
	userID, ok := ctx.Value(constants.UserIDKey).(string)
	return userID, ok
}

// NewUserAuthInterceptor 创建一个新的用户认证拦截器
func NewUserAuthInterceptor() grpc.UnaryServerInterceptor {
	return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
		md, ok := metadata.FromIncomingContext(ctx)
		if !ok {
			return handler(ctx, req)
		}

		// 获取user_id
		userIDs := md.Get("user_id")
		if len(userIDs) > 0 {
			// 将user_id写入context
			ctx = context.WithValue(ctx, constants.UserIDKey, userIDs[0])
		}

		return handler(ctx, req)
	}
}