using System;
using System.Collections.Generic;
using System.Numerics;
using Coroutine;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using MLEM.Cameras;
using MLEM.Startup;
using TouchyTickets.Upgrades;

namespace TouchyTickets {
    public class GameImpl : MlemGame {

        public static GameImpl Instance { get; private set; }
        public readonly ISet<Upgrade> AppliedUpgrades = new HashSet<Upgrade>();
        public readonly Platform Platform;
        public BigInteger Tickets;
        public int TimesRestarted;
        public int Stars;
        public ParkMap Map;
        public Tutorial Tutorial { get; private set; }
        public Camera Camera { get; private set; }
        public Ui Ui { get; private set; }
        public bool DrawMap;
        public DateTime LastUpdate;
        public TimeSpan PlayTime;
        private double saveCounter;
        private double achievementCounter;

        public GameImpl(Platform platform) {
            this.Platform = platform;
            Instance = this;
        }

        protected override void LoadContent() {
            base.LoadContent();
            Assets.Load();
            Options.Load();

            // start the load sequence
            Ui.SetupUiSystem(this.UiSystem);
            CoroutineHandler.Start(Ui.DisplaySplash(this.LoadGame));
        }

        private void LoadGame() {
            // set up online stuff
            var analytics = new Dictionary<string, object>();
            analytics["InfoLog"] = true;
            analytics["VerboseLog"] = true;
            analytics["ResourceCurrencies"] = new[] {"Tickets", "Stars"};
            analytics["ResourceItemTypes"] = new[] {"Attraction", "Restart", "Upgrade", "Modifier"};
            // ios comes first, then android. For now they're the same
            analytics["GameKey"] = new[] {"cc18de06eebbc5d5e987c384fcd28000", "cc18de06eebbc5d5e987c384fcd28000"};
            analytics["SecretKey"] = new[] {"82ca1a930ee38e2383ffb02db7631e16033b511d", "82ca1a930ee38e2383ffb02db7631e16033b511d"};
            this.Platform.SetupOnlineInteractions(analytics);

            this.Tutorial = new Tutorial();

            if (!SaveHandler.Load(this))
                this.Map = new ParkMap(20, 20);

            // load other stuff
            this.Ui = new Ui(this.UiSystem);
            this.Camera = new Camera(this.GraphicsDevice) {
                Scale = 4,
                AutoScaleWithScreen = true,
                AutoScaleReferenceSize = new Point(720, 1280),
                MaxScale = 24,
                MinScale = 2
            };

            // update the map once to make sure that catching up happens during loading
            this.UpdateMapOnce();
        }

        protected override void DoUpdate(GameTime gameTime) {
            base.DoUpdate(gameTime);

            if (this.Map != null) {
                // update the map
                this.UpdateMapOnce();

                // achievements
                this.achievementCounter += gameTime.ElapsedGameTime.TotalSeconds;
                if (this.achievementCounter >= 5) {
                    this.achievementCounter = 0;
                    foreach (var achievement in Achievement.Achievements.Values)
                        achievement.Update();
                }

                // save every 3 seconds
                this.saveCounter += gameTime.ElapsedGameTime.TotalSeconds;
                if (this.saveCounter >= 3) {
                    this.saveCounter = 0;
                    SaveHandler.Save(this);
                }
            }

            // play time stuff
            var lastTime = this.PlayTime;
            this.PlayTime += gameTime.ElapsedGameTime;
            if (lastTime.TotalHours >= 1 != this.PlayTime.TotalHours >= 1)
                Ui.DisplayRatePlease();

            this.Ui?.Update(gameTime);
            this.Tutorial?.Update(this);
        }

        protected override void DoDraw(GameTime gameTime) {
            this.GraphicsDevice.Clear(Color.Black);
            if (this.DrawMap) {
                this.SpriteBatch.Begin(SpriteSortMode.Deferred, null, SamplerState.PointClamp, transformMatrix: this.Camera.ViewMatrix);
                this.Map.Draw(gameTime, this.SpriteBatch, Vector2.Zero, 1, 1, true, this.Camera.GetVisibleRectangle());
                this.SpriteBatch.End();
            }
            base.DoDraw(gameTime);
        }

        public BigInteger GetStarPrice() {
            return 1000000000 * BigInteger.Pow(100, this.TimesRestarted);
        }

        public int GetBuyableStars() {
            #if DEBUG
            return 3;
            #endif
            return (int) BigInteger.Min(3, this.Tickets / this.GetStarPrice());
        }

        private void UpdateMapOnce() {
            var now = DateTime.Now;
            if (this.LastUpdate != default) {
                var lastTickets = this.Tickets;
                var lastTps = this.Map.TicketsPerSecond;

                var passed = now - this.LastUpdate;
                this.Map.Update(passed, passed.TotalSeconds >= 1);

                // if 10 or more seconds passed, we display a message
                if (Options.Instance.WhileYouWereAwayMessage && passed.TotalSeconds >= 10)
                    Ui.DisplayWhileYouWereAway(passed, this.Tickets - lastTickets, this.Map.TicketsPerSecond - lastTps);
            }
            this.LastUpdate = now;
        }

    }
}