using AngleSharp;
using DocumentFormat.OpenXml.Packaging;
using Masuit.MyBlogs.Core.Common;
using Masuit.MyBlogs.Core.Extensions.Firewall;
using Masuit.MyBlogs.Core.Extensions.UEditor;
using Masuit.MyBlogs.Core.Models.DTO;
using Masuit.MyBlogs.Core.Models.ViewModel;
using Masuit.Tools.AspNetCore.Mime;
using Masuit.Tools.AspNetCore.ResumeFileResults.Extensions;
using Masuit.Tools.Core.Net;
using Masuit.Tools.Html;
using Masuit.Tools.Logging;
using Masuit.Tools.Systems;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Newtonsoft.Json;
using OpenXmlPowerTools;
using System;
using System.ComponentModel.DataAnnotations;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading;
using System.Threading.Tasks;
using System.Xml.Linq;

namespace Masuit.MyBlogs.Core.Controllers
{
    /// <summary>
    /// 文件上传
    /// </summary>
    [ApiExplorerSettings(IgnoreApi = true)]
    [ServiceFilter(typeof(FirewallAttribute))]
    public class UploadController : Controller
    {
        public IWebHostEnvironment HostEnvironment { get; set; }

        public ActionResult ResultData(object data, bool isTrue = true, string message = "")
        {
            return Content(JsonConvert.SerializeObject(new
            {
                Success = isTrue,
                Message = message,
                Data = data
            }, new JsonSerializerSettings
            {
                MissingMemberHandling = MissingMemberHandling.Ignore
            }), "application/json", Encoding.UTF8);
        }

        #region Word上传转码

        /// <summary>
        /// 上传Word转码
        /// </summary>
        /// <returns></returns>
        [HttpPost]
        public async Task<ActionResult> UploadWord(CancellationToken cancellationToken)
        {
            var form = await Request.ReadFormAsync(cancellationToken);
            var files = form.Files;
            if (files.Count <= 0)
            {
                return ResultData(null, false, "请先选择您需要上传的文件!");
            }

            var file = files[0];
            string fileName = file.FileName;
            if (!Regex.IsMatch(Path.GetExtension(fileName), "doc|docx"))
            {
                return ResultData(null, false, "文件格式不支持，只能上传doc或者docx的文档!");
            }

            var html = await SaveAsHtml(file);
            if (html.Length < 10)
            {
                return ResultData(null, false, "读取文件内容失败，请检查文件的完整性，建议另存后重新上传！");
            }

            if (html.Length > 1000000)
            {
                return ResultData(null, false, "文档内容超长，服务器拒绝接收，请优化文档内容后再尝试重新上传！");
            }

            return ResultData(new
            {
                Title = Path.GetFileNameWithoutExtension(fileName),
                Content = html
            });
        }
        private async Task<string> ConvertToHtml(IFormFile file)
        {
            var docfile = Path.Combine(Environment.GetEnvironmentVariable("temp") ?? "upload", file.FileName);
            try
            {
                await using var ms = file.OpenReadStream();
                await using var fs = System.IO.File.Create(docfile, 1024, FileOptions.DeleteOnClose);
                await ms.CopyToAsync(fs);
                using var doc = WordprocessingDocument.Open(fs, true);
                var pageTitle = file.FileName;
                var part = doc.CoreFilePropertiesPart;
                if (part != null)
                {
                    pageTitle ??= (string)part.GetXDocument().Descendants(DC.title).FirstOrDefault();
                }

                var settings = new HtmlConverterSettings()
                {
                    PageTitle = pageTitle,
                    FabricateCssClasses = false,
                    RestrictToSupportedLanguages = false,
                    RestrictToSupportedNumberingFormats = false,
                    ImageHandler = imageInfo =>
                    {
                        var stream = new MemoryStream();
                        imageInfo.Bitmap.Save(stream, imageInfo.Bitmap.RawFormat);
                        var base64String = Convert.ToBase64String(stream.ToArray());
                        return new XElement(Xhtml.img, new XAttribute(NoNamespace.src, $"data:{imageInfo.ContentType};base64," + base64String), imageInfo.ImgStyleAttribute, imageInfo.AltText != null ? new XAttribute(NoNamespace.alt, imageInfo.AltText) : null);
                    }
                };
                var htmlElement = HtmlConverter.ConvertToHtml(doc, settings);
                var html = new XDocument(new XDocumentType("html", null, null, null), htmlElement);
                var htmlString = html.ToString(SaveOptions.DisableFormatting);
                return htmlString;
            }
            finally
            {
                if (System.IO.File.Exists(docfile))
                {
                    System.IO.File.Delete(docfile);
                }
            }
        }

        private async Task<string> SaveAsHtml(IFormFile file)
        {
            var html = await ConvertToHtml(file);
            var context = BrowsingContext.New(Configuration.Default);
            var doc = context.OpenAsync(req => req.Content(html)).Result;
            var body = doc.Body;
            var nodes = body.GetElementsByTagName("img");
            foreach (var img in nodes)
            {
                var attr = img.Attributes["src"].Value;
                var strs = attr.Split(",");
                var base64 = strs[1];
                var bytes = Convert.FromBase64String(base64);
                var ext = strs[0].Split(";")[0].Split("/")[1];
                await using var image = new MemoryStream(bytes);
                var imgFile = $"{SnowFlake.NewId}.{ext}";
                var path = Path.Combine(HostEnvironment.WebRootPath, CommonHelper.SystemSettings.GetOrAdd("UploadPath", "upload").Trim('/', '\\'), "images", imgFile);
                var dir = Path.GetDirectoryName(path);
                Directory.CreateDirectory(dir);
                await using var fs = new FileStream(path, FileMode.OpenOrCreate, FileAccess.ReadWrite);
                await image.CopyToAsync(fs);
                img.Attributes["src"].Value = path.Substring(HostEnvironment.WebRootPath.Length).Replace("\\", "/");
            }

            return body.InnerHtml.HtmlSantinizerStandard().HtmlSantinizerCustom(attributes: new[] { "dir", "lang" });
        }

        private static async Task SaveFile(IFormFile file, string path)
        {
            var dir = Path.GetDirectoryName(path);
            Directory.CreateDirectory(dir);
            await using var fs = new FileStream(path, FileMode.OpenOrCreate, FileAccess.ReadWrite);
            await file.CopyToAsync(fs);
        }

        #endregion

        /// <summary>
        /// 文件下载
        /// </summary>
        /// <param name="path"></param>
        /// <returns></returns>
        [HttpGet("download/{**path}")]
        public ActionResult Download([FromServices] IMimeMapper mimeMapper, [Required] string path)
        {
            if (string.IsNullOrEmpty(path)) return Content("null");
            var file = Path.Combine(HostEnvironment.WebRootPath, CommonHelper.SystemSettings.GetOrAdd("UploadPath", "upload").Trim('/', '\\'), path.Trim('.', '/', '\\'));
            if (System.IO.File.Exists(file))
            {
                return this.ResumePhysicalFile(file, mimeMapper.GetMimeFromPath(file), Path.GetFileName(file));
            }

            return Content("null");
        }

        /// <summary>
        /// UEditor文件上传处理
        /// </summary>
        /// <returns></returns>
        [Route("fileuploader")]
        public async Task<ActionResult> UeditorFileUploader()
        {
            UserInfoDto user = HttpContext.Session.Get<UserInfoDto>(SessionKey.UserInfo) ?? new UserInfoDto();
            var action = Request.Query["action"].ToString() switch //通用
            {
                "config" => (Handler)new ConfigHandler(HttpContext),
                "uploadimage" => new UploadHandler(HttpContext, new UploadConfig()
                {
                    AllowExtensions = UeditorConfig.GetStringList("imageAllowFiles"),
                    PathFormat = "/" + CommonHelper.SystemSettings.GetOrAdd("UploadPath", "upload").Trim('/', '\\') + UeditorConfig.GetString("imagePathFormat"),
                    SizeLimit = UeditorConfig.GetInt("imageMaxSize"),
                    UploadFieldName = UeditorConfig.GetString("imageFieldName")
                }),
                "uploadscrawl" => new UploadHandler(HttpContext, new UploadConfig()
                {
                    AllowExtensions = new[]
                    {
                        ".png"
                    },
                    PathFormat = "/" + CommonHelper.SystemSettings.GetOrAdd("UploadPath", "upload").Trim('/', '\\') + UeditorConfig.GetString("scrawlPathFormat"),
                    SizeLimit = UeditorConfig.GetInt("scrawlMaxSize"),
                    UploadFieldName = UeditorConfig.GetString("scrawlFieldName"),
                    Base64 = true,
                    Base64Filename = "scrawl.png"
                }),
                "catchimage" => new CrawlerHandler(HttpContext),
                _ => new NotSupportedHandler(HttpContext)
            };

            if (user.IsAdmin)
            {
                switch (Request.Query["action"])//管理员用
                {
                    //case "uploadvideo":
                    //    action = new UploadHandler(context, new UploadConfig()
                    //    {
                    //        AllowExtensions = UeditorConfig.GetStringList("videoAllowFiles"),
                    //        PathFormat =  "/" + CommonHelper.SystemSettings.GetOrAdd("UploadPath", "upload") + UeditorConfig.GetString("videoPathFormat"),
                    //        SizeLimit = UeditorConfig.GetInt("videoMaxSize"),
                    //        UploadFieldName = UeditorConfig.GetString("videoFieldName")
                    //    });
                    //    break;
                    case "uploadfile":
                        action = new UploadHandler(HttpContext, new UploadConfig()
                        {
                            AllowExtensions = UeditorConfig.GetStringList("fileAllowFiles"),
                            PathFormat = "/" + CommonHelper.SystemSettings.GetOrAdd("UploadPath", "upload").Trim('/', '\\') + UeditorConfig.GetString("filePathFormat"),
                            SizeLimit = UeditorConfig.GetInt("fileMaxSize"),
                            UploadFieldName = UeditorConfig.GetString("fileFieldName")
                        });
                        break;
                        //case "listimage":
                        //    action = new ListFileManager(context, CommonHelper.SystemSettings.GetOrAdd("UploadPath", "/upload") + UeditorConfig.GetString("imageManagerListPath"), UeditorConfig.GetStringList("imageManagerAllowFiles"));
                        //    break;
                        //case "listfile":
                        //    action = new ListFileManager(context, CommonHelper.SystemSettings.GetOrAdd("UploadPath", "/upload") + UeditorConfig.GetString("fileManagerListPath"), UeditorConfig.GetStringList("fileManagerAllowFiles"));
                        //    break;
                }
            }

            string result = await action.Process();
            return Content(result, ContentType.Json);
        }

        /// <summary>
        /// 上传文件
        /// </summary>
        /// <param name="imagebedClient"></param>
        /// <param name="file"></param>
        /// <returns></returns>
        [HttpPost("upload"), ApiExplorerSettings(IgnoreApi = false)]
        public async Task<ActionResult> UploadFile([FromServices] ImagebedClient imagebedClient, IFormFile file, CancellationToken cancellationToken)
        {
            string path;
            string filename = SnowFlake.GetInstance().GetUniqueId() + Path.GetExtension(file.FileName);
            var pathBase = CommonHelper.SystemSettings.GetOrAdd("UploadPath", "upload").Trim('/', '\\');
            switch (file.ContentType)
            {
                case var _ when file.ContentType.StartsWith("image"):
                    {
                        await using var stream = file.OpenReadStream();
                        var (url, success) = await imagebedClient.UploadImage(stream, file.FileName, cancellationToken);
                        if (success)
                        {
                            return ResultData(url);
                        }

                        path = Path.Combine(HostEnvironment.WebRootPath, pathBase, "images", filename);
                        var dir = Path.GetDirectoryName(path);
                        Directory.CreateDirectory(dir);
                        await using var fs = new FileStream(path, FileMode.OpenOrCreate, FileAccess.ReadWrite);
                        await file.CopyToAsync(fs);
                        break;
                    }
                case var _ when file.ContentType.StartsWith("audio") || file.ContentType.StartsWith("video"):
                    path = Path.Combine(HostEnvironment.WebRootPath, pathBase, "media", filename);
                    break;
                case var _ when file.ContentType.StartsWith("text") || (ContentType.Doc + "," + ContentType.Xls + "," + ContentType.Ppt + "," + ContentType.Pdf).Contains(file.ContentType):
                    path = Path.Combine(HostEnvironment.WebRootPath, pathBase, "docs", filename);
                    break;
                default:
                    path = Path.Combine(HostEnvironment.WebRootPath, pathBase, "files", filename);
                    break;
            }
            try
            {
                await SaveFile(file, path);
                return ResultData(path.Substring(HostEnvironment.WebRootPath.Length).Replace("\\", "/"));
            }
            catch (Exception e)
            {
                LogManager.Error(e);
                return ResultData(null, false, "文件上传失败！");
            }
        }
    }
}