/// <summary>
/// Allows administrator to view and edit help page specified by id.
/// </summary>
/// <param name="hPage"></param>
/// <returns></returns>
public async Task <IActionResult> EditHelpPage(int hPage, EditHelpPageViewModel viewModel)
{
//Update page before refresh.
if (viewModel.WasEdited && ModelState.IsValid)
{
int result = await AdministrationServiceLogic.UpdateHelpPage(hPage, viewModel, context);
if (result > 0)
{
ViewBag.Message = "Help page saved.";
}
else
{
switch (result)
{
case 0:
ViewBag.Message = "An error occurred while updating help page";
break;
case -1:
ViewBag.Message = "Help page data is invalid";
break;
case -2:
ViewBag.Message = "Help page title is invalid (it should be character string shorter than " +
IoCContainer.DbSettings.Value.MaxHelpPageTitleSize + ").";
break;
case -3:
ViewBag.Message = "Help page content is invalid (it should be character string shorter than " +
IoCContainer.DbSettings.Value.MaxHelpPageSize + ").";
break;
case -4:
ViewBag.Message = "One of tags is invalid (it should be character string shorter than " +
IoCContainer.DbSettings.Value.MaxTagLength + ").";
break;
}
}
}
HelpPage helpPage = await context.HelpPages.FindAsync(hPage);
List <HelpTag> helpTags = SearchEngine.FindTagsForHelpPage(hPage, context);
string helpTagsString = string.Empty;
foreach (HelpTag tag in helpTags)
{
helpTagsString += (tag.Value + " ");
}
ViewData["pageTags"] = helpTagsString;
ViewData["helpPage"] = helpPage;
return(View());
}
/// <summary>
/// Updates help page content.
/// </summary>
/// <param name="pageId"></param>
/// <param name="newTitle"></param>
/// <param name="newContent"></param>
/// <param name="context"></param>
/// <returns></returns>
public static async Task <int> UpdateHelpPage(int pageId, EditHelpPageViewModel viewModel, AppDbContext context)
{
// Perform validation
if (viewModel == null)
{
return(-1);
}
else if (string.IsNullOrEmpty(viewModel.Title) ||
viewModel.Title.Count() > IoCContainer.DbSettings.Value.MaxHelpPageTitleSize)
{
return(-2);
}
else if (string.IsNullOrEmpty(viewModel.Content) ||
viewModel.Content.Count() > IoCContainer.DbSettings.Value.MaxHelpPageSize)
{
return(-3);
}
HelpPage helpPage = await context.HelpPages.FindAsync(pageId);
helpPage.Title = viewModel.Title;
helpPage.Content = viewModel.Content;
helpPage.IsLocked = viewModel.IsLocked;
// Prepare tags string.
List <string> newTagsList = StringExtensions.RemoveDuplicateWords(StringExtensions.RemoveSpecials(viewModel.Tags.ToUpper().Trim())).Split(' ').ToList();
// Find additions and deletions.
var deleteRange = (from hpht in context.HelpPageHelpTags
where hpht.HelpPageID == pageId
select hpht);
context.HelpPageHelpTags.RemoveRange(deleteRange);
List <HelpPageHelpTag> relationsToAdd = new List <HelpPageHelpTag>();
foreach (string tag in newTagsList)
{
if (tag.Count() > IoCContainer.DbSettings.Value.MaxTagLength)
{
return(-4);
}
HelpTag existingTag = (from ht in context.HelpTags
where ht.Value.ToUpper() == tag
select ht).SingleOrDefault();
if (existingTag != null)
{
relationsToAdd.Add(new HelpPageHelpTag
{
HelpPage = helpPage,
HelpTag = existingTag,
});
}
else
{
HelpTag newTag = new HelpTag
{
Value = tag
};
await context.HelpTags.AddAsync(newTag);
relationsToAdd.Add(new HelpPageHelpTag
{
HelpPage = helpPage,
HelpTag = newTag,
});
}
}
// Add new many-to-many
await context.HelpPageHelpTags.AddRangeAsync(relationsToAdd);
// Commit changes.
int updateResult = await context.SaveChangesAsync();
// Simple false return instead throwing database exception
// because then it would be necessary to check if title or
// context has been changed. Note that content may be very large
// and comparing could have huge performance impact.
return(updateResult);
}
