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

namespace VideoGameQuotes.Web.Controllers {
	public class GameController : Controller {
		private readonly IGameService gameService;
		private readonly ICurrentUserProvider<User> userProvider;

		public GameController(IGameService gameService, ICurrentUserProvider<User> userProvider) {
			this.gameService = gameService;
			this.userProvider = userProvider;
		}

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

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

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

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

			var icon = new byte[0];
			if (model.GameIcon != null) {
				icon = Convert.FromBase64String(model.GameIcon);
				if (icon.Length > 1024) {
					ModelState.AddModelError("GameIcon", "Icon must be smaller than 1KB");
				}
			}

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

			var game = gameService.FindById(model.GameId);
			game.Name = model.GameName;
			game.Icon = icon;
			game.Region = model.GameRegions;
			game.Website = model.GameWebsite;
			
			game.ClearPublishers();
			game.ClearSystems();
			(model.PublisherIds ?? Enumerable.Empty<int>()).Walk(id => game.AddPublisher(new Publisher { Id = id }));
			(model.SystemIds ?? Enumerable.Empty<int>()).Walk(id => game.AddSystem(new GamingSystem { Id = id }));

			game = gameService.Save(game);
			return Json(this.CreateJsonResponse(data: game.ToDto()));
		}

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

			if (gameService.FindByNameAndSystems(model.GameName, model.SystemIds) != null) {
				return Json(this.CreateJsonResponse("A game with that name for one of those systems already exists."));
			}

			var game = new Game { Name = model.GameName, Website = model.GameWebsite, Region = model.GameRegions, Creator = userProvider.CurrentUser };
			model.SystemIds.Walk(id => game.AddSystem(new GamingSystem { Id = id }));
			if (model.PublisherIds != null) {
				model.PublisherIds.Walk(id => game.AddPublisher(new Publisher {Id = id}));
			}

			game = gameService.Save(game);
			return Json(this.CreateJsonResponse(data: game.ToDto()));
		}
	}
}