using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using YKMoon.ICSharpCode.SharpZipLib.Zip;
using System.IO;

namespace YKMoon.IO
{
	public partial class IOTools
	{
		/// <summary>
		/// Get ZipStream from "Assets/Resources".
		/// </summary>
		/// <param name="resourcePath">base on "Assets/Resources" without extension.</param>
		/// <param name="password">zip password.</param>
		/// <param name="autoThrowException">if true will throw exception else return null when catch any exception.</param>
		/// <returns>null if resource not exist.when autoThrowException is false and has exception will return null.</returns>
		public static ZipInputStream GetZipStreamFromResources(string resourcePath, string password = "", bool autoThrowException = false)
		{
			//ZipConstants.DefaultCodePage = 0;
			ZipInputStream outputStream = null;
			Stream stream = null;
			try {
				TextAsset textAsset = Resources.Load(resourcePath) as TextAsset;
				stream = new MemoryStream(textAsset.bytes);
				outputStream = new ZipInputStream(stream);
				outputStream.Password = password;
				outputStream.GetNextEntry();
				return outputStream;
			} catch(System.Exception e) {
				Debug.LogException(e);
				if(stream != null) {
					stream.Close();
					stream.Dispose();
					stream = null;
				}
				if(outputStream != null) {
					outputStream.Close();
					outputStream.Dispose();
					outputStream = null;
				}
				if(autoThrowException) {
					throw e;
				} else {
					return null;
				}
			}			
		}
		/// <summary>
		/// Get ZipStream from <paramref name="fullPath"/>.
		/// </summary>
		/// <param name="fullPath">full path with file extension.</param>
		/// <param name="password">zip password.</param>
		/// <param name="autoThrowException">if true will throw exception else return null when catch any exception.</param>
		/// <returns>null if resource not exist.when autoThrowException is false and has exception will return null.</returns>
		public static ZipInputStream GetZipFileStream(string fullPath, string password="", bool autoThrowException = false)
        {
			ZipInputStream outputStream = null;
			FileStream fileStream = null;
			try {
				fileStream = File.OpenRead(fullPath);
				outputStream = new ZipInputStream(fileStream);
				outputStream.Password = password;
				outputStream.GetNextEntry();
				return outputStream;
			} catch(System.Exception e) {
				Debug.LogException(e);
				if(fileStream != null) {
					fileStream.Close();
					fileStream.Dispose();
					fileStream = null;
				}
				if(outputStream != null) {
					outputStream.Close();
					outputStream.Dispose();
					outputStream = null;
				}
				if(autoThrowException) {
					throw e;
				} else {
					return null;
				}
			}
		}
	}
}