#pragma once
#include "fs/MBR.h"

#define GPT_SIGNATURE "EFI PART"
#define GPT_SIGNATURE_LENGTH 8
#define GPT_SECTOR_SIZE 512ul
#define GPT_REVISION 0x00010000

namespace GPT
{
    struct [[gnu::packed]] Header
    {
        u8 signature[GPT_SIGNATURE_LENGTH];
        u32 revision;
        u32 hdr_size;
        u32 checksum;
        u32 reserved;
        u64 this_lba;
        u64 alternate_lba;
        u64 first_usable;
        u64 last_usable;
        u8 guid[16];
        u64 partition_table_lba;
        u32 num_partitions;
        u32 partition_entry_size;
        u32 partition_table_checksum;
        char blank[512 - 0x5c];
    };

    struct [[gnu::packed]] PartitionEntry
    {
        u8 type_guid[16];
        u8 unique_guid[16];
        u64 start_lba;
        u64 end_lba;
        u64 attributes;
        char partition_name[72]; // Could be more or less, see Header::partition_entry_size - 0x38 for the actual size.
    };

    Result<bool> identify(SharedPtr<Device> device);

    u32 checksum_gpt(Header header);
}