#pragma once

#include <stdint.h>
#include <stddef.h>

namespace esphome {
namespace grub_boot_switch {

#define WBVAL(x) ((x) & 0xFF), (((x) >> 8) & 0xFF)
#define QBVAL(x) ((x) & 0xFF), (((x) >> 8) & 0xFF), (((x) >> 16) & 0xFF), (((x) >> 24) & 0xFF)

constexpr uint8_t FAT_MEDIA_FIXED_DISK = 0xF8;
constexpr uint8_t FAT_NAME_LEN = 8;
constexpr uint8_t FAT_EXT_LEN = 3;

enum FatFileAttributes : uint8_t {
  kFatAttr_ReadOnly = 0x01,
  kFatAttr_Hidden = 0x02,
  kFatAttr_System = 0x04,
  kFatAttr_VolumeLabel = 0x08,
  kFatAttr_Subdirectory = 0x10,
  kFatAttr_Archive = 0x20,
  kFatAttr_LongFileName = 0x0F,
};

enum FatOrdinalFlags : uint8_t {
  kFat_LastLFN = 0x40,
  kFat_DeletedLFN = 0x80,
};

struct FatDirEntry {
  char name[FAT_NAME_LEN];
  char ext[FAT_EXT_LEN];
  uint8_t attrs;
  uint8_t type;
  uint8_t ctime_ms;
  uint16_t ctime;
  uint16_t cdate;
  uint16_t adate;
  uint16_t ea_index;
  uint16_t mtime;
  uint16_t mdate;
  uint16_t start;
  uint32_t size;
} __attribute__((packed));

uint8_t fat_write_lfn(const char *name, const FatDirEntry *direntry, uint8_t *output);
uint8_t fat_write_dir(const FatDirEntry *direntry, uint8_t *output);
uint16_t fat_date(uint16_t year, uint8_t month, uint8_t day);

}  // namespace grub_boot_switch
}  // namespace esphome