using System.IO;

namespace System.Security.Cryptography {
#pragma warning disable CS1591 // O comentário XML ausente não foi encontrado para o tipo ou membro visível publicamente
    public static class HashAlgorithm_CB_Extension {
#pragma warning restore CS1591 // O comentário XML ausente não foi encontrado para o tipo ou membro visível publicamente

        /// <summary>
        /// Computes the hash value for the specified byte array.
        /// </summary>
        /// <param name="H">Target object.</param>
        /// <param name="FilePath">The full path of the file.</param>
        /// <exception cref="ArgumentNullException"/>
        /// <exception cref="ObjectDisposedException"/>
        /// <exception cref="ArgumentException"/>
        /// <exception cref="PathTooLongException"/>
        /// <exception cref="DirectoryNotFoundException"/>
        /// <exception cref="IOException"/>
        /// <exception cref="UnauthorizedAccessException"/>
        /// <exception cref="FileNotFoundException"/>
        /// <exception cref="NotSupportedException"/>
        /// <exception cref="SecurityException"/>
        /// <returns>The computed hash code.</returns>
        public static byte[] ComputeHash(this HashAlgorithm H, string FilePath)
            => H.ComputeHash(File.ReadAllBytes(FilePath));

        /// <summary>
        /// Computes the hash value for the specified byte array.
        /// </summary>
        /// <param name="H">Target object.</param>
        /// <param name="FilePath">The full path of the file.</param>
        /// <exception cref="ArgumentNullException"/>
        /// <exception cref="ObjectDisposedException"/>
        /// <exception cref="ArgumentException"/>
        /// <exception cref="PathTooLongException"/>
        /// <exception cref="DirectoryNotFoundException"/>
        /// <exception cref="IOException"/>
        /// <exception cref="UnauthorizedAccessException"/>
        /// <exception cref="FileNotFoundException"/>
        /// <exception cref="NotSupportedException"/>
        /// <exception cref="SecurityException"/>
        /// <returns>The computed hash code for string.</returns>
        public static HashString ComputeHashToString(this HashAlgorithm H, string FilePath) {
            byte[] bytes = ComputeHash(H, FilePath);
            if (!(bytes is null))
                return new HashString(bytes);
            return HashString.Empty;
        }

        /// <summary>
        /// Computes the hash value for the specified byte array.
        /// </summary>
        /// <param name="H">Target object.</param>
        /// <param name="buffer">The input to compute the hash code for.</param>
        /// <exception cref="ArgumentNullException"/>
        /// <exception cref="ObjectDisposedException"/>
        /// <returns>The computed hash code for string.</returns>
        public static HashString ComputeHashToString(this HashAlgorithm H, byte[] buffer) {
            buffer = H.ComputeHash(buffer);
            if (!(buffer is null)) 
                return new HashString(buffer);
            return HashString.Empty;
        }
    
        /// <summary>
        /// Computes the hash value for the specified region of the specified byte array.
        /// </summary>
        /// <param name="H">Target object.</param>
        /// <param name="buffer">The input to compute the hash code for.</param>
        /// <param name="offset">The offset into the byte array from which to begin using data.</param>
        /// <param name="count">The number of bytes in the array to use as data.</param>
        /// <exception cref="ArgumentException"/>
        /// <exception cref="ArgumentNullException"/>
        /// <exception cref="ArgumentOutOfRangeException"/>
        /// <exception cref="ObjectDisposedException"/>
        /// <returns>The computed hash code for string.</returns>
        public static HashString ComputeHashToString(this HashAlgorithm H, byte[] buffer, int offset, int count) {
            buffer = H.ComputeHash(buffer, offset, count);
            if (!(buffer is null))
                return new HashString(buffer);
            return HashString.Empty;
        }
    
        /// <summary>
        /// Computes the hash value for the specified <see cref="System.IO.Stream"/> object.
        /// </summary>
        /// <param name="H">Target object.</param>
        /// <param name="inputStream">The input to compute the hash code for.</param>
        /// <exception cref="ObjectDisposedException"/>
        /// <returns>The computed hash code for string.</returns>
        public static HashString ComputeHashToString(this HashAlgorithm H, Stream inputStream) {
            byte[] buffer = H.ComputeHash(inputStream);
            if (!(buffer is null)) 
                return new HashString(buffer);
            return HashString.Empty;
        }
    }
}