using System.IO;
using UnityEngine;

/// <summary>
/// 路径帮助类
/// </summary>
public class PathHelper
{
    /// <summary>
    /// 根目录
    /// </summary>
    public static readonly string m_AssetRootPath = Application.dataPath;

    /// <summary>
    /// 只读根目录(streamingAssetsPath)
    /// </summary>
    public static readonly string m_ReadOnlyPath = Application.streamingAssetsPath;

    /// <summary>
    /// 可读可写根目录(persistentDataPath)
    /// </summary>
    public static readonly string m_WriteAndReadPath = Application.persistentDataPath;

    /// <summary>
    /// 获取标准路径
    /// </summary>
    /// <param name="_path"></param>
    /// <returns></returns>
    public static string GetStandardPath(string _path)
    {
        if (string.IsNullOrEmpty(_path))
        {
            return string.Empty;
        }

        return _path.Trim().Replace("\\", "/");
    }

    /// <summary>
    /// 获取指定路径
    /// </summary>
    /// <param name="_path"></param>
    /// <returns></returns>
    public static string GetSpecifiedPath(string _path)
    {
        if (string.IsNullOrEmpty(_path))
        {
            return null;
        }

        string result =
#if UNITY_STANDALONE_WIN
            GetStandardPath(m_ReadOnlyPath + "/" + _path);
#else
            GetStandardPath(m_WriteAndReadPath + "/" + _path);
#endif

        return result;
    }

    /// <summary>
    /// 获取文件后缀
    /// </summary>
    /// <param name="_fileName">带有后缀的文件名</param>
    /// <returns>返回带点的文件后缀</returns>
    public static string GetFileSuffix(string _fileName)
    {
        if(string.IsNullOrEmpty(_fileName))
        {
            return string.Empty;
        }

        return "." + _fileName.Split('.')[1];
    }

    /// <summary>
    /// 根据路径获取文件扩展名
    /// </summary>
    /// <param name="_path"></param>
    /// <returns></returns>
    public static string GetExtensionBasedOnPath(string _path)
    {
        if (string.IsNullOrEmpty(_path))
        {
            return string.Empty;
        }

        return Path.GetFileName(_path);
    }
    
    
    /// <summary>
    /// 获取文件名
    /// </summary>
    /// <param name="_fileName">带有后缀的文件名</param>
    /// <returns></returns>
    public static string GetFileName(string _fileName)
    {
        if (string.IsNullOrEmpty(_fileName))
        {
            return string.Empty;
        }

        return _fileName.Split('.')[0];
    }

    /// <summary>
    /// 根据路径获取不带扩展名的文件名
    /// </summary>
    /// <param name="_path"></param>
    /// <returns></returns>
    public static string GetFileNameWithoutExtensionOnPath(string _path)
    {
        if (string.IsNullOrEmpty(_path))
        {
            return string.Empty;
        }

        return Path.GetFileNameWithoutExtension(_path);
    }
    
    /// <summary>
    /// 根据路径获取文件名，带扩展名
    /// </summary>
    /// <param name="_path"></param>
    /// <returns></returns>
    public static string GetFileNameBasedOnPath(string _path)
    {
        if (string.IsNullOrEmpty(_path))
        {
            return string.Empty;
        }

        return Path.GetFileName(_path);
    }

    
    /// <summary>
    /// 合并路径
    /// </summary>
    /// <param name="_paths"></param>
    /// <returns></returns>
    public static string CombineFilePath(params string[] _paths)
    {
        if (_paths.Length <= 0)
        {
            return null;
        }

        string result = "";

        for (int i = 0; i < _paths.Length; i++)
        {
            result = Path.Combine(result, _paths[i]);
        }
        
        return result;
    }
}