using System;
using System.Collections.Generic;
using System.Data.Entity.Validation;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.Mvc;
using EnVisage.Code;
using NLog;

namespace EnVisage.Controllers
{
    [Authorize]
    public abstract class BaseController : Controller
    {
        protected readonly EnVisageEntities DbContext = new EnVisageEntities();

        protected static readonly Logger Logger = LogManager.GetCurrentClassLogger();

        public void LogError(ExceptionContext exceptionContext)
        {
            Logger.Fatal(exceptionContext.Exception);
        }

        public void LogError(string message)
        {
            Logger.Fatal(message);
        }

        public void LogException(Exception ex)
        {
            var sb = new StringBuilder();
            sb.AppendLine(string.Format("{0}: {1}", ex.GetType(), ex.Message));
            sb.AppendLine(ex.StackTrace);

            var innerCount = 0;
            var innerEx = ex;
            while (innerEx.InnerException != null && innerCount++ < Constants.MAX_INNER_EXCEPTION_LOG_LEVEL)
            {
                if (innerEx.Message != innerEx.InnerException.Message)
                    sb.AppendLine("Inner Exception Message: " + innerEx.InnerException.Message);
                innerEx = innerEx.InnerException;
            }
            var dbEntityValidationException = ex as DbEntityValidationException;
            if (dbEntityValidationException != null)
            {
                foreach (var validationErrors in dbEntityValidationException.EntityValidationErrors)
                {
                    foreach (var validationError in validationErrors.ValidationErrors)
                    {
                        sb.AppendFormat("Property: {0} Error: {1}", validationError.PropertyName,
                            validationError.ErrorMessage);

                    }
                }
                sb.AppendLine(dbEntityValidationException.StackTrace);
            }
            if (System.Web.HttpContext.Current != null)
            {
                sb.AppendLine();
                sb.AppendLine(string.Format("URL: {0}", System.Web.HttpContext.Current.Request.Url));
                sb.AppendLine(string.Format("Referrer: {0}", System.Web.HttpContext.Current.Request.UrlReferrer));
                sb.AppendLine(string.Format("QueryString: {0}", System.Web.HttpContext.Current.Request.QueryString));
                sb.AppendLine(string.Format("UserHostAddress: {0}", System.Web.HttpContext.Current.Request.UserHostAddress));
                sb.AppendLine(string.Format("UserAgent: {0}", System.Web.HttpContext.Current.Request.UserAgent));
                if (System.Web.HttpContext.Current.Request.Form.Count > 0)
                {
                    sb.AppendLine();
                    sb.AppendLine("Form:");
                    foreach (string key in System.Web.HttpContext.Current.Request.Form.Keys)
                    {
                        sb.AppendLine(string.Format("{0}: {1}", key, System.Web.HttpContext.Current.Request.Form[key]));
                    }
                }
            }

            // log error using NLog
            Logger.Fatal(sb.ToString());
        }

        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                DbContext.Dispose();
            }
            base.Dispose(disposing);
        }

        protected virtual void SetErrorScript(string title = Constants.ERROR_GENERAL_TITLE_TEMPLATE,
                                                   string message = Constants.ERROR_GENERAL_MESSAGE_TEMPLATE)
        {
            ViewBag.StartUpJS = string.Format("showErrorModal('{0}','{1}');", title.Replace("'", "''"),
                                              message.Replace("'", "''"));
        }

        protected BaseController()
        {
            ViewBag.GlobalVariables = string.Format("var _isLockCheckIntervalMs = {0};{1}var _periodOfInactivity = {2};",
                Properties.Settings.Default.JSLockCheckInterval, Environment.NewLine,
                Properties.Settings.Default.UnlockInterval);
        }
        
        // TEMPLATE FOR ANY GET METHOD
        //public ActionResult Index()
        //{
        //    try
        //    {
        //        // check permission to get this info
        //        if (!HtmlHelpers.CheckSecurityObjectPermission(null, "Fiscal Calendar", "Area", User.Identity.GetUserId()))
        //            return Redirect("/");
        //        // load data from DB using BLL object
        //        var manager = new FiscalCalendarManager(DbContext);
        //        var model = manager.LoadFiscalCalendarSettings();
        //        // return model filled with data from DB
        //        return View(model);
        //    }
        //    catch (BLLException blEx) // handle any system specific error
        //    {
        //        // display error message if required
        //        if (blEx.DisplayError)
        //            SetErrorScript(message: blEx.Message);
        //        else // if display not requried then display modal form with general error message 
        //        {
        //            LogException(blEx);
        //            SetErrorScript();
        //        }
        //    }
        //    catch (Exception exception) // handle any unexpected error
        //    {
        //        LogException(exception);
        //        SetErrorScript();
        //    }
        //    // return empty model with validation message (if any) 
        //    return View(new FiscalCalendarModel());
        //}

        // TEMPLATE FOR ANY POST METHOD
        //[HttpPost]
        //[ValidateAntiForgeryToken]
        //public ActionResult Edit(FiscalCalendarModel model)
        //{
        //    // remove whitespaces from string model properties
        //    model.TrimStringProperties();
            
        // Example of logging object 
        //var sb = new StringBuilder();
        //sb.AppendLine("Model of the Edit method (post):");
        //model.DebugObjectProperties(sb);
        //Logger.Debug(sb);

        //    if (ModelState.IsValid)
        //    {
        //        try
        //        {
        //            // save data from model to the DB
        //            var manager = new FiscalCalendarManager(DbContext);
        //            manager.SaveFiscalCalendarSettings(model);
        //            DbContext.SaveChanges();
        //            // remove content lock
        //            ContentLocker.RemoveLock("SystemSettings", model.TypeSettingId.ToString(), User.Identity.Name);
        //            // refresh the page on successful result
        //            return RedirectToAction("Index");
        //        }
        //        catch (BLLException blEx) // handle any system specific error
        //        {
        //            // display error message if required
        //            if (blEx.DisplayError)
        //                ModelState.AddModelError(string.Empty, blEx.Message);
        //            else // if display not requried then display modal form with general error message 
        //            {
        //                LogException(blEx);
        //                SetErrorScript();
        //            }
        //        }
        //        catch (Exception exception) // handle any unexpected error
        //        {
        //            LogException(exception);
        //            SetErrorScript();
        //        }
        //    }
        //    // return empty model with validation message (if any) 
        //    return View(model);
        //}
    }
}