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

namespace VideoGameQuotes.Web.Controllers {
	public class SystemController : Controller {
		private readonly ISystemService systemService;

		public SystemController(ISystemService systemService) {
			this.systemService = systemService;
		}

		protected new ActionResult Json(object data) {
			return this.SerializeToJson(data);
		}

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

			try {
				var system = systemService.FindById(id);
				var games = systemService.GetGamesForSystem(system);
				if (games.Any()) {
					return Json(this.CreateJsonErrorResponse(
						string.Format("The following games are still using this system: {0}", games.Implode(game => game.Name, ", "))
					));
				}
			} catch (EntityNotFoundException) {
				return Json(this.CreateJsonErrorResponse("No system exists for ID " + id));
			}

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

		[HttpPost, VerifyUser(Group = UserGroup.Admin)]
		public ActionResult Edit(EditSystemModel model) {
			if (model.SystemId < 1) {
				ModelState.AddModelError("SystemId", "Invalid system ID");
			}

			byte[] icon = null;
			if (model.SystemIcon != null) {
				icon = Convert.FromBase64String(model.SystemIcon);
				if (icon.Length > 1024) {
					ModelState.AddModelError("SystemIcon", "Icon must be smaller than 1KB");
				}
			}

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

			var system = systemService.FindById(model.SystemId);
			system.Name = model.SystemName;

			system.Abbreviation = model.SystemAbbreviation;
			system.ReleaseDate = model.SystemReleaseDate;
			system.Icon = icon;

			system = systemService.Save(system);
			return Json(this.CreateJsonResponse(data: system.ToDto()));
		}

		[HttpPost, VerifyUser]
		public ActionResult Create(EditSystemModel model) {
			byte[] icon = null;
			if (model.SystemIcon != null) {
				icon = Convert.FromBase64String(model.SystemIcon);
				if (icon.Length > 1024) {
					ModelState.AddModelError("SystemIcon", "Icon must be smaller than 1KB");
				}
			}

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

			if (systemService.FindByNameOrAbbreviation(model.SystemName, model.SystemAbbreviation).Any()) {
				return Json(this.CreateJsonResponse("A system with that name or abbreviation already exists."));
			}

			var system = new GamingSystem { 
				Abbreviation = model.SystemAbbreviation, 
				Name = model.SystemName, 
				ReleaseDate = model.SystemReleaseDate,
				Icon = icon
			};

			system = systemService.Save(system);
			return Json(this.CreateJsonResponse(data: system.ToDto()));
		}
	}
}