using System.Web.Mvc;
using Portoa.Persistence;
using Portoa.Web.Controllers;
using VideoGameQuotes.Api;
using VideoGameQuotes.Web.Models;
using VideoGameQuotes.Web.Security;
using VideoGameQuotes.Web.Services;

namespace VideoGameQuotes.Web.Controllers {
	public class CategoryController : Controller {
		private readonly ICategoryService categoryService;

		public CategoryController(ICategoryService categoryService) {
			this.categoryService = categoryService;
		}

		[HttpPost, VerifyUser(Group = UserGroup.Admin)]
		public JsonResult Delete(int id) {
			if (id < 1) {
				return Json(this.CreateJsonResponse("Invalid ID"));
			}

			try {
				var category = categoryService.FindById(id);
				var numQuotes = categoryService.GetQuotesForCategory(category);
				if (numQuotes > 0) {
					return Json(this.CreateJsonErrorResponse(
						string.Format("There are {0} quotes that are still using this category", numQuotes)
					));
				}
			} catch (EntityNotFoundException) {
				return Json(this.CreateJsonErrorResponse("No category exists for ID " + id));
			}

			categoryService.Delete(id);
			return Json(this.CreateJsonResponse());
		}

		[HttpPost, VerifyUser(Group = UserGroup.Admin)]
		public JsonResult Edit(EditCategoryModel model) {
			if (model.CategoryId < 1) {
				ModelState.AddModelError("CategoryId", "Invalid category ID");
			}

			if (!ModelState.IsValid) {
				return Json(this.CreateJsonErrorResponse("Some errors occurred"));
			}

			try {
				var category = categoryService.FindById(model.CategoryId);
				if (categoryService.FindByName(model.CategoryName) != null) {
					return Json(this.CreateJsonErrorResponse("A category already exists for that name"));
				}

				category.Name = model.CategoryName;

				category = categoryService.Save(category);
				return Json(this.CreateJsonResponse(data: category.ToDto()));
			} catch (EntityNotFoundException) {
				return Json(this.CreateJsonErrorResponse("No category exists for ID " + model.CategoryId));
			}
		}

		[HttpPost, VerifyUser]
		public JsonResult Create(EditCategoryModel model) {
			if (!ModelState.IsValid) {
				return Json(this.CreateJsonErrorResponse("Some errors occurred."));
			}

			if (categoryService.FindByName(model.CategoryName) != null) {
				return Json(this.CreateJsonErrorResponse("A category already exists for that name"));
			}

			var category = categoryService.Save(new Category { Name = model.CategoryName });
			return Json(this.CreateJsonResponse(data: category.ToDto()));
		}
	}
}