//
// Created by cfif on 13.06.2024.
//
#include "lfs_file_utils.h"

#define CHECK_LFS_ERR if (lfs_err != LFS_ERR_OK) return lfs_err;

int dumpEbuFile(lfs_t *env, char *filename, void *buf, uint16_t size) {
    lfs_file_t file;

    int lfs_err = lfs_file_open(env, &file, filename, LFS_O_WRONLY | LFS_O_CREAT);
    CHECK_LFS_ERR

    lfs_err = lfs_file_rewind(env, &file);
    CHECK_LFS_ERR

    int writes = lfs_file_write(env, &file, buf, size);
    if (writes != size)
        return -100;

    lfs_err = lfs_file_close(env, &file);
    CHECK_LFS_ERR

    return lfs_err;
}

int loadEbuFile(lfs_t *env, char *filename, void *buf, uint16_t size) {
    lfs_file_t file;

    int lfs_err = lfs_file_open(env, &file, filename, LFS_O_RDONLY);
    CHECK_LFS_ERR

    int reading = lfs_file_read(env, &file, buf, size);
    if (reading != size)
        return -100;

    lfs_err = lfs_file_close(env, &file);
    CHECK_LFS_ERR

    return lfs_err;
}

int32_t getFreeSize(lfs_t *env) {
    lfs_ssize_t size = lfs_fs_size(env);
    lfs_ssize_t countFree = (lfs_ssize_t)env->block_count - size;
    return countFree;
}

uint32_t getBufCrc(uint8_t *buf, uint32_t size) {

    uint32_t crc = 0;

    for (uint32_t i = 0; i < size; ++i) {
        crc += buf[i];
    }

    return crc;
}

uint32_t getFileCrc(lfs_t *env, char *filename, uint32_t size) {
    uint8_t buf[256];
    uint32_t crc = 0;


    uint32_t countPartFull = size / sizeof(buf);
    uint32_t countPartTail = size % sizeof(buf);

    int lfs_err;
    lfs_file_t file;

    lfs_err = lfs_file_open(env, &file, filename, LFS_O_RDONLY);
    lfs_err = lfs_file_rewind(env, &file);

    uint32_t pCountPart = 0;

    for (uint32_t i = 0; i < countPartFull; ++i) {
        int reading = lfs_file_read(env, &file, &buf[pCountPart], countPartFull);
        crc += getBufCrc(buf, countPartFull);
        pCountPart += countPartFull;
    }

    if (countPartTail) {
        int reading = lfs_file_read(env, &file, &buf[pCountPart], countPartTail);
        crc += getBufCrc(buf, countPartFull);
    }
    lfs_err = lfs_file_close(env, &file);

    return crc;
}