/*
 * Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include <AK/ByteBuffer.h>
#include <AK/RefPtr.h>
#include <AK/Result.h>
#include <AK/Vector.h>
#include <Kernel/Storage/Partition/PartitionTable.h>

namespace Kernel {

class MBRPartitionTable : public PartitionTable {
public:
    struct [[gnu::packed]] Entry {
        u8 status;
        u8 chs1[3];
        u8 type;
        u8 chs2[3];
        u32 offset;
        u32 length;
    };
    struct [[gnu::packed]] Header {
        u8 code1[218];
        u16 ts_zero;
        u8 ts_drive;
        u8 ts_seconds;
        u8 ts_minutes;
        u8 ts_hours;
        u8 code2[216];
        u32 disk_signature;
        u16 disk_signature_zero;
        Entry entry[4];
        u16 mbr_signature;
    };

public:
    ~MBRPartitionTable();

    static Result<NonnullOwnPtr<MBRPartitionTable>, PartitionTable::Error> try_to_initialize(const StorageDevice&);
    static OwnPtr<MBRPartitionTable> try_to_initialize(const StorageDevice&, u32 start_lba);
    explicit MBRPartitionTable(const StorageDevice&);
    MBRPartitionTable(const StorageDevice&, u32 start_lba);

    bool is_protective_mbr() const;
    bool contains_ebr() const;
    virtual bool is_valid() const override { return m_valid; };

protected:
    const Header& header() const;
    bool is_header_valid() const { return m_header_valid; };

private:
    bool read_boot_record();
    bool initialize();
    bool m_valid { false };
    bool m_header_valid { false };
    const u32 m_start_lba;
    ByteBuffer m_cached_header;
};
}