using System;
using System.Linq;
using System.Text;
using System.Web.Mvc;
using Umbraco.Core.Events;
using Umbraco.Core.IO;
using Umbraco.Core.Logging;
using Umbraco.Core.Services;
using Umbraco.Web.Macros;
using Umbraco.Web.Mvc;
using umbraco;
using umbraco.cms.businesslogic.macro;
using System.Collections.Generic;
using Umbraco.Core;

using Template = umbraco.cms.businesslogic.template.Template;

namespace Umbraco.Web.WebServices
{
    /// <summary>
    /// A REST controller used to save files such as templates, partial views, macro files, etc...
    /// </summary>
    /// <remarks>
    /// This isn't fully implemented yet but we should migrate all of the logic in the umbraco.presentation.webservices.codeEditorSave
    /// over to this controller.
    /// </remarks>
    public class SaveFileController : UmbracoAuthorizedController
    {

        /// <summary>
        /// Saves a partial view for a partial view macro
        /// </summary>
        /// <param name="filename"></param>
        /// <param name="oldName"></param>
        /// <param name="contents"></param>
        /// <returns></returns>
        [HttpPost]
        public JsonResult SavePartialView(string filename, string oldName, string contents)
        {
            var folderPath = SystemDirectories.MvcViews.EnsureEndsWith('/');// +"/Partials/";

            // validate file
            IOHelper.ValidateEditPath(IOHelper.MapPath(folderPath + filename), folderPath);
            // validate extension
            IOHelper.ValidateFileExtension(IOHelper.MapPath(folderPath + filename), new[] { "cshtml" }.ToList());

            //TODO: Validate using the macro engine
            var engine = MacroEngineFactory.GetEngine(PartialViewMacroEngine.EngineName);
            //engine.Validate(...)

            var val = contents;
            var saveOldPath = oldName.StartsWith("~/") ? IOHelper.MapPath(oldName) : IOHelper.MapPath(folderPath + oldName);
            var savePath = filename.StartsWith("~/") ? IOHelper.MapPath(filename) : IOHelper.MapPath(folderPath + filename);

            //Directory check.. only allow files in script dir and below to be edited
            if (!savePath.StartsWith(IOHelper.MapPath(folderPath)))
            {
                return Failed(
                    ui.Text("speechBubbles", "partialViewErrorText"), ui.Text("speechBubbles", "partialViewErrorHeader"),
                    //pass in a new exception ... this will also append the the message
                    new ArgumentException("Illegal path: " + savePath));
            }


            if (Saving.IsRaisedEventCancelled(new SaveEventArgs<string>(savePath), this))
            {
                return Failed(
                    ui.Text("speechBubbles", "partialViewErrorText"), ui.Text("speechBubbles", "partialViewErrorHeader"),
                    //pass in a new exception ... this will also append the the message
                    new ArgumentException("Save was cancelled by an event handler " + savePath));
            }

            //deletes the old file
            if (savePath != saveOldPath)
            {
                if (System.IO.File.Exists(saveOldPath))
                    System.IO.File.Delete(saveOldPath);
            }

            //NOTE: I've left the below here just for informational purposes. If we save a file this way, then the UTF8
            // BOM mucks everything up, strangely, if we use WriteAllText everything is ok! 
            // http://issues.umbraco.org/issue/U4-2118
            //using (var sw = System.IO.File.CreateText(savePath))
            //{
            //    sw.Write(val);
            //}

            System.IO.File.WriteAllText(savePath, val, Encoding.UTF8);

            Saved.RaiseEvent(new SaveEventArgs<string>(savePath, false), this);

            return Success(ui.Text("speechBubbles", "partialViewSavedText"), ui.Text("speechBubbles", "partialViewSavedHeader"));
        }

        /// <summary>
        /// Saves a template
        /// </summary>
        /// <param name="templateName"></param>
        /// <param name="templateAlias"></param>
        /// <param name="templateContents"></param>
        /// <param name="templateId"></param>
        /// <param name="masterTemplateId"></param>
        /// <returns></returns>
        [HttpPost]
        public JsonResult SaveTemplate(string templateName, string templateAlias, string templateContents, int templateId, int masterTemplateId)
        {
            Template t;
            bool pathChanged = false;
            try
            {
                t = new Template(templateId)
                {
                    Text = templateName,
                    Alias = templateAlias,
                    Design = templateContents
                };

                //check if the master page has changed
                if (t.MasterTemplate != masterTemplateId)
                {
                    pathChanged = true;
                    t.MasterTemplate = masterTemplateId;
                }
            }
            catch (ArgumentException ex)
            {
                //the template does not exist
                return Failed("Template does not exist", ui.Text("speechBubbles", "templateErrorHeader"), ex);
            }

            try
            {
                t.Save();

                //ensure the correct path is synced as the parent might have been changed
                // http://issues.umbraco.org/issue/U4-2300                
                if (pathChanged)
                {
                    //need to re-look it up
                    t = new Template(templateId);
                }
                var syncPath = "-1,init," + t.Path.Replace("-1,", "");

                return Success(ui.Text("speechBubbles", "templateSavedText"), ui.Text("speechBubbles", "templateSavedHeader"),
                    new { path = syncPath });
            }
            catch (Exception ex)
            {
                return Failed(ui.Text("speechBubbles", "templateErrorText"), ui.Text("speechBubbles", "templateErrorHeader"), ex);
            }
        }

        /// <summary>
        /// Returns a successful message
        /// </summary>
        /// <param name="message">The message to display in the speach bubble</param>
        /// <param name="header">The header to display in the speach bubble</param>
        /// <param name="additionalVals"></param>
        /// <returns></returns>
        private JsonResult Success(string message, string header, object additionalVals = null)
        {
            var d = additionalVals == null ? new Dictionary<string, object>() : additionalVals.ToDictionary<object>();
            d["success"] = true;
            d["message"] = message;
            d["header"] = header;

            return Json(d);
        }

        /// <summary>
        /// Returns a failed message
        /// </summary>
        /// <param name="message">The message to display in the speach bubble</param>
        /// <param name="header">The header to display in the speach bubble</param>
        /// <param name="exception">The exception if there was one</param>
        /// <returns></returns>
        private JsonResult Failed(string message, string header, Exception exception = null)
        {
            if (exception != null)
                LogHelper.Error<SaveFileController>("An error occurred saving a file. " + message, exception);
            return Json(new
            {
                success = false,
                header = header,
                message = message + (exception == null ? "" : (exception.Message + ". Check log for details."))
            });
        }

        /// <summary>
        /// Occurs before Create
        /// </summary>
        internal static event TypedEventHandler<SaveFileController, SaveEventArgs<string>> Saving;

        /// <summary>
        /// Occurs after Create
        /// </summary>
        internal static event TypedEventHandler<SaveFileController, SaveEventArgs<string>> Saved;
    }
}