using System;
using System.IO;
using System.Text;

namespace DotN64
{
    using Helpers;

    public partial class Cartridge
    {
        #region Fields
        public const ushort HeaderSize = 0x40, BootstrapSize = 0x1000 - HeaderSize;
        #endregion

        #region Properties
        public byte[] ROM { get; }

        public uint ClockRate => BitHelper.FromBigEndian(BitConverter.ToUInt32(ROM, 0x04));

        public uint BootAddress => BitHelper.FromBigEndian(BitConverter.ToUInt32(ROM, 0x08));

        public uint Release => BitHelper.FromBigEndian(BitConverter.ToUInt32(ROM, 0x0C));

        public uint[] CRC => new[]
        {
            BitHelper.FromBigEndian(BitConverter.ToUInt32(ROM, 0x10)),
            BitHelper.FromBigEndian(BitConverter.ToUInt32(ROM, 0x14))
        };

        public string ImageName => Encoding.ASCII.GetString(ROM, 0x20, 0x34 - 0x20);

        public string ID => Encoding.ASCII.GetString(ROM, 0x3B, 4);

        public MediaFormat Format => (MediaFormat)ROM[0x3B];

        public RegionCode Region => (RegionCode)ROM[0x3E];

        public byte Version => ROM[0x3F];
        #endregion

        #region Constructors
        public Cartridge(byte[] rom)
        {
            ROM = rom;
        }

        public Cartridge(FileInfo file)
            : this(File.ReadAllBytes(file.FullName)) { }
        #endregion
    }
}