using Microsoft.SharePoint.Client;
using Microsoft.SharePoint.Client.Search.Query;
using Newtonsoft.Json.Linq;
using OfficeDevPnP.Core.Pages;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Security;
using System.Text;
using System.Threading.Tasks;

namespace ConfluenceToSharePointMigrator
{
    /// <summary>
    /// Migrate Confluence space to SharePoint site.
    /// </summary>
    class Migration
    {
        public static Guid webId = Guid.Empty;
        public static Guid siteId = Guid.Empty;
        public static NavigationNode parentNode = null;

        /// <summary>
        /// Migration Confluence to Sharepoint
        /// </summary>
        /// <param name="exportedLocation">Local location of exported Confluence</param>
        /// <param name="clientContext">Client context of SharePoint site</param>
        public void MigrateConfluenceToSharePoint(string sharePointSiteURL, string exportedLocation, ClientContext clientContext)
        {

            Web web1 = clientContext.Web;
            clientContext.Load(web1);
            clientContext.ExecuteQueryRetry();

            HTMLFileProcess htmlFileProcess = new HTMLFileProcess();
            string[] htmlFiles = Directory.GetFiles(exportedLocation, "*.html");

            Web web = clientContext.Web;
            clientContext.Load(web.Lists);
            clientContext.Load(web, w => w.Title);
            clientContext.Load(web);
            clientContext.Load(clientContext.Site);
            clientContext.ExecuteQueryRetry();
            
            webId = clientContext.Web.Id;
            siteId = clientContext.Site.Id;

            if (clientContext.WebExistsFullUrl(sharePointSiteURL))
            {
                foreach (string htmlFile in htmlFiles)
                {

                    //set page name from html file.
                    string pageName = htmlFileProcess.SharePointPageNameFromHtml(new FileInfo(htmlFile).Name, htmlFile);
                    Console.WriteLine(pageName);
                    string htmlContent = System.IO.File.ReadAllText(htmlFile);
                    
                    //Create the Page
                    if (!pageName.EndsWith("Home") && !pageName.EndsWith("index"))
                    {
                        var page = clientContext.Web.AddClientSidePage(pageName + ".aspx", true);
                        page.AddSection(CanvasSectionTemplate.OneColumn, 0);
                        page.Save();

                        CanvasSection section = page.Sections[0];

                        //Remove unwanted content.
                        htmlContent = htmlFileProcess.FrameHTMLContentForSharePointPage(htmlContent);
                        //Upload the files and replace the link.
                        htmlContent = htmlFileProcess.UploadImageURLToHtml(htmlContent, exportedLocation, sharePointSiteURL, clientContext);
                        
                        ClientSideText pageConent = new ClientSideText() { Text = htmlContent };

                        page.AddControl(pageConent, section.Columns[0], 0);
                        page.PageTitle = pageName;
                        page.Save();
                        page.Publish();
                        Console.WriteLine("   - Page published");
                    }
                }
            }
        }


        /// <summary>
        /// Upload image or file.
        /// </summary>
        /// <param name="source_file">image or file local location</param>
        /// <param name="ctx">ClientContext of SharePoint site</param>
        public void SharePointFileUpload(string source_file, ClientContext ctx)
        {
            var folder = ctx.Web.GetFolderByServerRelativeUrl("Shared Documents");
            System.IO.FileInfo file = new FileInfo(source_file);
            if (!System.IO.File.Exists(source_file))
                Console.WriteLine("File not fount: " + source_file);
            else
            {
                FileStream fs = System.IO.File.OpenRead(source_file);
                string source_filename = Path.GetFileName(source_file);
                FileCreationInformation fci = new FileCreationInformation();
                fci.Overwrite = true;
                fci.ContentStream = fs;
                fci.Url = source_filename;
                var file_upload = folder.Files.Add(fci);
                ctx.Load(file_upload);
                ctx.ExecuteQuery();

                fs.Close();
            }
        }
    }
}