#ifndef __TWAI_OTA_H
#define __TWAI_OTA_H

#include <stdint.h>
#include "esp_partition.h"
#include "esp_ota_ops.h"

#define CONFIG_EXAMPLE_GPIO_DIAGNOSTIC (3)

#define OTA_BUFFSIZE        (1024)
#define HASH_LEN            32 /* SHA-256 digest length */

#define OTA_ERR_OFFSET      0xAA00
typedef enum 
{
    OTA_OK = 0,
    OTA_PARAM_ERROR = OTA_ERR_OFFSET | 1,
    OTA_GET_PARTITION_ERROR,
    OTA_HEADER_CHECK_ERROR,
    OTA_BEGIN_FUN_ERROR,
    OTA_WRITE_FUN_ERROR,
    OTA_END_FUN_ERROR,
    OTA_SET_BOOT_PARTITION_ERROR,
} ota_err_t;


typedef struct 
{
    esp_ota_handle_t update_handle;
    esp_partition_t *update_partition;

    bool image_header_was_checked;
    int img_header_size;
    int img_header_app_desc_offset;

    int buf_len;
    uint8_t buf[OTA_BUFFSIZE];  // buf的主要用途是：twai每次8个字节，在开始时因为需要进行校验，所以不能把读入的直接写入分区，应先存着进行校验
    long long binary_file_length;   
} ota_ctrl_t;

void ota_init(void);
ota_err_t ota_enter_command(void);
ota_err_t ota_image_header_check_and_start(void);
ota_err_t ota_download_data_in(uint8_t *data, int len);
ota_err_t ota_download_finish_command(void);
char *ota_read_versions(void);

#endif