using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using TMPro;
using UnityEngine;
using UnityEngine.Networking;
public class LoadHelper
{

    #region 图片加载

    /// <summary>
    /// 从Streamming下加载图片
    /// </summary>
    /// <param name="filePath">Streamming下路径</param>
    /// <returns></returns>
    public static Sprite LoadSpriteFromStreamming(string filePath)
    {
        Sprite sprite = null;

        string tmpPath = Path.Combine(Application.streamingAssetsPath, filePath);

        sprite = LoadSprite(tmpPath);

        return sprite;
    }

    /// <summary>
    /// 加载精灵
    /// </summary>
    /// <param name="filePath"></param>
    /// <returns></returns>
    public static Sprite LoadSprite(string filePath)
    {
        Sprite sprite = null;

        Texture2D tmpTexture = LoadTexture(filePath);

        if (tmpTexture != null)
        {
            sprite = Sprite.Create(tmpTexture, new Rect(0f, 0f, tmpTexture.width, tmpTexture.height), Vector2.one * 0.5f);
        }

        return sprite;
    }

    /// <summary>
    /// 加载Texture
    /// </summary>
    /// <param name="filePath"></param>
    /// <returns></returns>
    public static Texture2D LoadTexture(string filePath)
    {
        Texture2D tmpTexture = null;

        filePath = GetSuffixExtension(filePath);

        if (!File.Exists(filePath))
        {
            Debug.Log("<color=red>" + filePath + "不存在" + "</color>");
            return null;
        }

        using (FileStream stream = new FileStream(filePath, FileMode.Open))
        {
            byte[] tmpArr = new byte[stream.Length];

            stream.Read(tmpArr, 0, tmpArr.Length);
            stream.Close();

            tmpTexture = new Texture2D(1, 1);
            tmpTexture.LoadImage(tmpArr);
        }

        return tmpTexture;
    }

    /// <summary>
    /// 检索图片类型
    /// </summary>
    /// <param name="filePath"></param>
    /// <returns></returns>
    private static string GetSuffixExtension(string filePath)
    {
        string tmpPath = filePath;

        if (File.Exists(filePath + ".png")) { tmpPath = filePath + ".png"; }
        if (File.Exists(filePath + ".PNG")) { tmpPath = filePath + ".PNG"; }
        if (File.Exists(filePath + ".JPG")) { tmpPath = filePath + ".JPG"; }
        if (File.Exists(filePath + ".jpg")) { tmpPath = filePath + ".jpg"; }
        if (File.Exists(filePath + ".jpeg")) { tmpPath = filePath + ".jpeg"; }

        return tmpPath;
    }

    #endregion


    #region 音频

    /// <summary>
    /// 加载音频
    /// </summary>
    /// <param name="filePath"></param>
    /// <param name="audioType"></param>
    /// <param name="callBack"></param>
    /// <returns></returns>
    IEnumerator LoadAudioClip(string filePath, AudioType audioType, Action<AudioClip> callBack = null)
    {
        filePath = GetAudioClipExtension(filePath);

        using (UnityWebRequest unityWebRequest = UnityWebRequestMultimedia.GetAudioClip(filePath, GetAudioClipType(filePath)))
        {
            yield return unityWebRequest.SendWebRequest();

            if (unityWebRequest.isNetworkError || unityWebRequest.isHttpError)
            {
                Debug.LogError(unityWebRequest.error);
            }
            else
            {
                AudioClip tmpAudioClip = DownloadHandlerAudioClip.GetContent(unityWebRequest);

                if (tmpAudioClip != null)
                {
                    callBack?.Invoke(tmpAudioClip);
                }
                else
                {
                    Debug.LogError("音频加载失败");
                }
            }
        }
    }

    /// <summary>
    /// 加载视频
    /// </summary>
    /// <param name="filePath"></param>
    /// <param name="audioType"></param>
    /// <param name="callBack"></param>
    /// <returns></returns>
    IEnumerator LoadVideoClip(string filePath, AudioType audioType, Action<AudioClip> callBack = null)
    {
        filePath = GetAudioClipExtension(filePath);

        using (UnityWebRequest unityWebRequest = UnityWebRequestMultimedia.GetAudioClip(filePath, GetAudioClipType(filePath)))
        {
            yield return unityWebRequest.SendWebRequest();

            if (unityWebRequest.isNetworkError || unityWebRequest.isHttpError)
            {
                Debug.LogError(unityWebRequest.error);
            }
            else
            {
                AudioClip tmpAudioClip = DownloadHandlerAudioClip.GetContent(unityWebRequest);

                if (tmpAudioClip != null)
                {
                    callBack?.Invoke(tmpAudioClip);
                }
                else
                {
                    Debug.LogError("音频加载失败");
                }
            }
        }
    }

    /// <summary>
    /// 获取音频格式
    /// </summary>
    /// <param name="filePath"></param>
    /// <returns></returns>
    private static AudioType GetAudioClipType(string filePath)
    {
        AudioType audioType = AudioType.UNKNOWN;

        if (File.Exists(filePath + ".mp3") || File.Exists(filePath + ".MP3")) { audioType = AudioType.MPEG; }
        if (File.Exists(filePath + ".wav") || File.Exists(filePath + ".WAV")) { audioType = AudioType.WAV; }
        if (File.Exists(filePath + ".vag") || File.Exists(filePath + ".VAG")) { audioType = AudioType.VAG; }

        return audioType;
    }

    /// <summary>
    /// 获取音频全路径
    /// </summary>
    /// <param name="filePath"></param>
    /// <returns></returns>
    private static string GetAudioClipExtension(string filePath)
    {
        string audioPath = string.Empty;

        if (File.Exists(filePath + ".mp3")) { audioPath = filePath + ".MP3";}
        if (File.Exists(filePath + ".MP3")) { audioPath = filePath + ".MP3"; }
        if (File.Exists(filePath + ".wav")) { audioPath = filePath + ".wav"; }
        if (File.Exists(filePath + ".WAV")) { audioPath = filePath + ".WAV"; }
        if (File.Exists(filePath + ".vag")) { audioPath = filePath + ".vag"; }
        if (File.Exists(filePath + ".VAG")) { audioPath = filePath + ".VAG"; }

        return audioPath;
    }

    #endregion
}