using System.Collections.Generic;

namespace Game.Global.Buffer
{
    /// <summary>
    /// 提供缓存机制的 string-string buffer，在超过一定长度之后自动删去之前的文件缓存，采取队列删除策略
    /// </summary>
    class FileBuffer
    {
        //文件结构管理
        private class CFile
        {
            public string fileName;
            public string fileContent;
            public CFile(string fName, string fContent)
            {
                fileName = fName;
                fileContent = fContent;
            }
        }

        List<CFile> g_cfgFileBuffer = new List<CFile>();

        int m_maxBufferCount = 3;

        public void SetBufferSize(int count)
        {
            m_maxBufferCount = count;
        }

        public int GetBufferSize()
        {
            return m_maxBufferCount;
        }

        /// <summary>
        /// 将文件名、文件内容放入缓冲区
        /// </summary>
        public void PushToBuffer(string fileName, string fileContent)
        {
            if (g_cfgFileBuffer.Count + 1 > m_maxBufferCount)
            {
                //Pop the first one:
                g_cfgFileBuffer.RemoveAt(0);
            }

            g_cfgFileBuffer.Add(new CFile(fileName, fileContent));
        }

        /// <summary>
        /// 获得对应文件名的缓存，如果不存在则返回false
        /// </summary>
        public bool GetFileContent(string fileName, out string fileContent)
        {
            for (int i = 0; i < g_cfgFileBuffer.Count; i++)
            {
                if (g_cfgFileBuffer[i].fileName == fileName)
                {
                    fileContent = g_cfgFileBuffer[i].fileContent;
                    return true;
                }
            }

            fileContent = null;
            return false;
        }
    }
}