using System;
using System.Linq;
using System.Web.Mvc;
using JetBrains.Annotations;
using VideoGameQuotes.Api;
using VideoGameQuotes.Web.Models;
using VideoGameQuotes.Web.Security;
using VideoGameQuotes.Web.Services;

namespace VideoGameQuotes.Web.Controllers {
	public class QuoteController : Controller {
		private readonly IQuoteService quoteService;
		private readonly ICurrentUserProvider currentUserProvider;

		public QuoteController(IQuoteService quoteService, ICurrentUserProvider currentUserProvider) {
			this.quoteService = quoteService;
			this.currentUserProvider = currentUserProvider;
		}

		[IsValidUser]
		public ActionResult Submit() {
			var model = new QuoteSubmitModel();
			ResetModel(model);

			return View(model);
		}

		[HttpPost, IsValidUser]
		public ActionResult Submit(QuoteSubmitModel model) {
			if (!ModelState.IsValid) {
				ResetModel(model);
				return View(model);
			}

			try {
				var quote = new Quote {
					Creator = currentUserProvider.CurrentUser,
					Game = GetGameFromModelData(model),
					Text = model.QuoteText
				};

				if (quote.Game == null) {
					ResetModel(model);
					return View(model);
				}

				quote = quoteService.SaveQuote(quote);

				return RedirectToAction("Quote", new { id = quote.Id });
			} catch (Exception e) {
				ModelState.AddModelError("save", e.Message);
				ResetModel(model);
				return View(model);
			}
		}

		[CanBeNull]
		private Game GetGameFromModelData(QuoteSubmitModel model) {
			if (model.GameId > 0) {
				try {
					return quoteService.GetGame(model.GameId);
				} catch {
					throw new Exception("Unable to find game with ID " + model.GameId);
				}
			}

			if (string.IsNullOrEmpty(model.GameName)) {
				ModelState.AddModelError("GameName", "Game name must be non-empty");
				return null;
			}

			//construct game from model data
			var game = new Game {
				Name = model.GameName,
				Region = model.GameRegions.Aggregate(Region.Unknown, (current, next) => current | (Region)Enum.Parse(typeof(Region), next)),
				Website = model.GameWebsite,
				Creator = currentUserProvider.CurrentUser
			};

			//publishers
			if ((model.PublisherIds != null && model.PublisherIds.Count > 0) || !string.IsNullOrEmpty(model.PublisherName)) {
				//modifying publishers, so remove errthing
				game.ClearPublishers();

				if (model.PublisherIds != null && model.PublisherIds.Count > 0) {
					foreach (var publisherId in model.PublisherIds) {
						game.AddPublisher(quoteService.GetPublisher(publisherId));
					}
				}

				if (!string.IsNullOrEmpty(model.PublisherName)) {
					game.AddPublisher(new Publisher {
						Name = model.PublisherName,
						Website = model.PublisherWebsite
					});
				}
			}

			//systems
			if ((model.SystemIds != null && model.SystemIds.Count > 0) || !string.IsNullOrEmpty(model.SystemName)) {
				//modifying systems, so remove errthing
				game.ClearSystems();

				if (model.SystemIds != null && model.SystemIds.Count > 0) {
					foreach (var systemId in model.SystemIds) {
						game.AddSystem(quoteService.GetSystem(systemId));
					}
				}

				if (!string.IsNullOrEmpty(model.SystemName)) {
					game.AddSystem(new GamingSystem {
						Name = model.SystemName,
						Abbreviation = model.SystemAbbreviation,
						ReleaseDate = model.SystemReleaseDate
					});
				}
			}

			return game;
		}

		private void ResetModel(QuoteSubmitModel model) {
			model.AllGames = quoteService.GetAllGames().OrderBy(game => game.Name);
			model.AllSystems = quoteService.GetAllSystems().OrderBy(system => system.ReleaseDate);
			model.AllPublishers = quoteService.GetAllPublishers();
		}

		public ActionResult Quote(int id) {
			return View(quoteService.GetQuote(id));
		}
	}
}