using MySql.Data.MySqlClient;
using parkMonitor.LOG;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;

namespace centralController.advert
{
    public class AdvertManager
    {
        /// <summary>
        /// 从数据库获取URL，更新本地广告文件
        /// </summary>
        /// <returns></returns>
        public bool UpdateAdvert(out string notification)
        {
            bool result = true;
            notification = "";
            List<string> urls = new List<string>();
            if (Monitor.Monitor.remoteDBOper != null)
            {
                //获取URLs
                string getAdvertUrlSql = "select advertUrl from advert;";
                MySqlDataReader reader = Monitor.Monitor.remoteDBOper.Query(getAdvertUrlSql);
                if (reader != null)
                {
                    try
                    {
                        while (reader.Read() && reader.HasRows)
                        {
                            urls.Add(reader.GetString("advertUrl"));
                        }
                    }
                    catch { result = false; }
                    try
                    {
                        reader.Close();
                        reader.Dispose();
                    }
                    catch { result = false; }
                }
                notification += "url读取结果：\n";
                //删除本地文件，下载url中文件到本地
                try
                {
                    if (!Directory.Exists(Monitor.Monitor.advertPath))
                    {
                        Directory.CreateDirectory(Monitor.Monitor.advertPath);
                    }
                }
                catch (Exception e) { Log.WriteLog(LogType.process, LogFile.ERROR, "路径创建异常"); result = false; }
                try
                {
                    string[] fileList = Directory.GetFileSystemEntries(Monitor.Monitor.advertPath);
                    if (fileList.Length == 0)
                    {
                        for (int i = 0; i < fileList.Length; i++)
                        {
                            File.Delete(fileList[i]);
                        }
                    }
                }
                catch (Exception e) { Log.WriteLog(LogType.process, LogFile.ERROR, "未找到需删除文件或删除文件异常\n" + e.Message); }
                try
                {
                    if (Directory.Exists(Monitor.Monitor.advertPath + @"\temp"))
                        Directory.Delete(Monitor.Monitor.advertPath + @"\temp", true);
                }
                catch (Exception e) { Log.WriteLog(LogType.process, LogFile.ERROR, "未找到需删除文件夹或删除文件夹异常\n" + e.Message); }

                if (result && urls.Count() > 0)
                {
                    List<string>.Enumerator enumer = urls.GetEnumerator();
                    while (enumer.MoveNext())
                    {
                        string fileName = Path.GetFileName(enumer.Current);
                        bool response = HttpDownload(enumer.Current, Monitor.Monitor.advertPath + @"\" + fileName);
                        result = result || response;
                        notification += (response?"成功：":"失败：")+fileName+"\n";
                    }
                }
            }
            return result;
        }
        /// <summary>
        /// http下载文件
        /// </summary>
        /// <param name="url">下载文件地址</param>
        /// <param name="path">文件存放地址，包含文件名</param>
        /// <returns></returns>
        private bool HttpDownload(string url, string path)
        {
            string tempPath = System.IO.Path.GetDirectoryName(path) + @"\temp";
            System.IO.Directory.CreateDirectory(tempPath);  //创建临时文件目录
            string tempFile = tempPath + @"\" + System.IO.Path.GetFileName(path) + ".temp"; //临时文件
            if (System.IO.File.Exists(tempFile))
            {
                System.IO.File.Delete(tempFile);    //存在则删除
            }
            try
            {
                FileStream fs = new FileStream(tempFile, FileMode.Append, FileAccess.Write, FileShare.ReadWrite);
                // 设置参数
                HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
                //发送请求并获取相应回应数据
                HttpWebResponse response = request.GetResponse() as HttpWebResponse;
                //直到request.GetResponse()程序才开始向目标网页发送Post请求
                Stream responseStream = response.GetResponseStream();
                //创建本地文件写入流
                //Stream stream = new FileStream(tempFile, FileMode.Create);
                byte[] bArr = new byte[1024];
                int size = responseStream.Read(bArr, 0, (int)bArr.Length);
                while (size > 0)
                {
                    //stream.Write(bArr, 0, size);
                    fs.Write(bArr, 0, size);
                    size = responseStream.Read(bArr, 0, (int)bArr.Length);
                }
                //stream.Close();
                fs.Close();
                responseStream.Close();
                System.IO.File.Move(tempFile, path);
                return true;
            }
            catch (Exception ex)
            {
                Log.WriteLog(LogType.process, LogFile.ERROR, "获取url：" + url + "失败\n" + ex.Message);
                return false;
            }
        }
    }
}