// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

#include "azure_c_shared_utility/crt_abstractions.h"
#include "azure_c_shared_utility/buffer_.h"
#include "azure_c_shared_utility/strings.h"
#include "azure_c_shared_utility/platform.h"
#include "azure_c_shared_utility/sha.h"
#include "azure_c_shared_utility/azure_base64.h"

#include "azure_prov_client/prov_security_factory.h"
#include "azure_prov_client/internal/prov_auth_client.h"

typedef struct REGISTRATION_INFO_TAG
{
    BUFFER_HANDLE endorsement_key;
    char* registration_id;
} REGISTRATION_INFO;

static int gather_registration_info(REGISTRATION_INFO* reg_info)
{
    int result;

    PROV_AUTH_HANDLE security_handle = prov_auth_create();
    if (security_handle == NULL)
    {
        (void)printf("failed creating security device handle\r\n");
        result = __LINE__;
    }
    else
    {
        if ((reg_info->endorsement_key = prov_auth_get_endorsement_key(security_handle)) == NULL)
        {
            (void)printf("failed getting endorsement key from device\r\n");
            result = __LINE__;
        }
        else if ((reg_info->registration_id = prov_auth_get_registration_id(security_handle)) == NULL)
        {
            (void)printf("failed getting endorsement key from device\r\n");
            BUFFER_delete(reg_info->endorsement_key);
            result = __LINE__;
        }
        else
        {
            result = 0;
        }
        prov_auth_destroy(security_handle);
    }
    return result;
}

int main(void)
{
    int result;
    REGISTRATION_INFO reg_info;
    memset(&reg_info, 0, sizeof(reg_info));

    (void)printf("Gathering the registration information...\r\n");
    if (platform_init() != 0)
    {
        (void)printf("Failed calling platform_init\r\n");
        result = __LINE__;
    }
    else if (prov_dev_security_init(SECURE_DEVICE_TYPE_TPM) != 0)
    {
        (void)printf("Failed calling prov_dev_security_init\r\n");
        result = __LINE__;
    }
    else
    {
        if (gather_registration_info(&reg_info) != 0)
        {
            result = __LINE__;
        }
        else
        {
            STRING_HANDLE encoded_ek;
            if ((encoded_ek = Azure_Base64_Encode(reg_info.endorsement_key)) == NULL)
            {
                (void)printf("Failure base64 encoding ek");
                result = __LINE__;
            }
            else
            {
                (void)printf("\r\nRegistration Id:\r\n%s\r\n", reg_info.registration_id);
                (void)printf("\r\nEndorsement Key:\r\n%s\r\n", STRING_c_str(encoded_ek));
                STRING_delete(encoded_ek);
                result = 0;
            }
            BUFFER_delete(reg_info.endorsement_key);
            free(reg_info.registration_id);
        }
        prov_dev_security_deinit();
        platform_deinit();
    }

    return result;
}