#include "string.h"
#include "sdkconfig.h"
#include "esp_err.h"
#include "esp_log.h"
#if CONFIG_IDF_TARGET_ESP32
#include "esp32/rom/spi_flash.h"
#elif CONFIG_IDF_TARGET_ESP32S2
#include "esp32s2/rom/spi_flash.h"
#include "esp32s2/rom/ets_sys.h"
#endif
#include "esp_rom_crc.h"
#include "esp_rom_gpio.h"
#include "esp_flash_partitions.h"
#include "bootloader_flash.h"
#include "bootloader_common.h"
#include "soc/gpio_periph.h"
#include "soc/rtc.h"
#include "soc/efuse_reg.h"
#include "hal/gpio_ll.h"
#include "esp_image_format.h"
#include "bootloader_sha.h"
#include "sys/param.h"

#define ESP_PARTITION_HASH_LEN 32 /* SHA-256 digest length */

static const char* TAG = "boot_comm";

uint32_t bootloader_common_ota_select_crc(const esp_ota_select_entry_t *s)
{
    return esp_rom_crc32_le(UINT32_MAX, (uint8_t*)&s->ota_seq, 4);
}

bool bootloader_common_ota_select_invalid(const esp_ota_select_entry_t *s)
{
    return s->ota_seq == UINT32_MAX || s->ota_state == ESP_OTA_IMG_INVALID || s->ota_state == ESP_OTA_IMG_ABORTED;
}

bool bootloader_common_ota_select_valid(const esp_ota_select_entry_t *s)
{
    return bootloader_common_ota_select_invalid(s) == false && s->crc == bootloader_common_ota_select_crc(s);
}

int bootloader_common_get_active_otadata(esp_ota_select_entry_t *two_otadata)
{
    if (two_otadata == NULL) {
        return -1;
    }
    bool valid_two_otadata[2];
    valid_two_otadata[0] = bootloader_common_ota_select_valid(&two_otadata[0]);
    valid_two_otadata[1] = bootloader_common_ota_select_valid(&two_otadata[1]);
    return bootloader_common_select_otadata(two_otadata, valid_two_otadata, true);
}

esp_err_t bootloader_common_check_chip_validity(const esp_image_header_t* img_hdr, esp_image_type type)
{
    esp_err_t err = ESP_OK;
    esp_chip_id_t chip_id = CONFIG_IDF_FIRMWARE_CHIP_ID;
    if (chip_id != img_hdr->chip_id) {
        ESP_LOGE(TAG, "mismatch chip ID, expected %d, found %d", chip_id, img_hdr->chip_id);
        err = ESP_FAIL;
    }
    uint8_t revision = bootloader_common_get_chip_revision();
    if (revision < img_hdr->min_chip_rev) {
        ESP_LOGE(TAG, "can't run on lower chip revision, expected %d, found %d", revision, img_hdr->min_chip_rev);
        err = ESP_FAIL;
    } else if (revision != img_hdr->min_chip_rev) {
#ifdef BOOTLOADER_BUILD
        ESP_LOGI(TAG, "chip revision: %d, min. %s chip revision: %d", revision, type == ESP_IMAGE_BOOTLOADER ? "bootloader" : "application", img_hdr->min_chip_rev);
#endif
    }
    return err;
}

int bootloader_common_select_otadata(const esp_ota_select_entry_t *two_otadata, bool *valid_two_otadata, bool max)
{
    if (two_otadata == NULL || valid_two_otadata == NULL) {
        return -1;
    }
    int active_otadata = -1;
    if (valid_two_otadata[0] && valid_two_otadata[1]) {
        int condition = (max == true) ? MAX(two_otadata[0].ota_seq, two_otadata[1].ota_seq) : MIN(two_otadata[0].ota_seq, two_otadata[1].ota_seq);
        if (condition == two_otadata[0].ota_seq) {
            active_otadata = 0;
        } else {
            active_otadata = 1;
        }
        ESP_LOGD(TAG, "Both OTA copies are valid");
    } else {
        for (int i = 0; i < 2; ++i) {
            if (valid_two_otadata[i]) {
                active_otadata = i;
                ESP_LOGD(TAG, "Only otadata[%d] is valid", i);
                break;
            }
        }
    }
    return active_otadata;
}