//Copyright (c) 2007-2016 ppy Pty Ltd <contact@ppy.sh>.
//Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE

using System;
using System.Threading;
using osu.Framework.Configuration;
using osu.Framework.GameModes;
using osu.Game.Configuration;
using osu.Game.GameModes.Menu;
using OpenTK;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Framework.Platform;
using osu.Game.GameModes.Play;
using osu.Game.Overlays;
using osu.Framework;
using osu.Framework.Input;
using osu.Game.Input;
using OpenTK.Input;
using osu.Framework.Logging;
using osu.Game.Graphics.UserInterface.Volume;
using osu.Game.Database;

namespace osu.Game
{
    public class OsuGame : OsuGameBase
    {
        public Toolbar Toolbar;
        public ChatConsole Chat;
        public MusicController MusicController;
        public MainMenu MainMenu => intro?.ChildGameMode as MainMenu;
        private Intro intro;

        private VolumeControl volume;

        public Bindable<PlayMode> PlayMode;

        string[] args;

        public OptionsOverlay Options;

        public OsuGame(string[] args = null)
        {
            this.args = args;
        }

        public override void SetHost(BasicGameHost host)
        {
            base.SetHost(host);

            host.Size = new Vector2(Config.Get<int>(OsuConfig.Width), Config.Get<int>(OsuConfig.Height));
        }

        protected override void Load(BaseGame game)
        {
            if (!Host.IsPrimaryInstance)
            {
                Logger.Log(@"osu! does not support multiple running instances.", LoggingTarget.Runtime, LogLevel.Error);
                Environment.Exit(0);
            }

            base.Load(game);

            if (args?.Length > 0)
                Schedule(delegate { Dependencies.Get<BeatmapDatabase>().Import(args); });

            //attach our bindables to the audio subsystem.
            Audio.Volume.Weld(Config.GetBindable<double>(OsuConfig.VolumeUniversal));
            Audio.VolumeSample.Weld(Config.GetBindable<double>(OsuConfig.VolumeEffect));
            Audio.VolumeTrack.Weld(Config.GetBindable<double>(OsuConfig.VolumeMusic));

            PlayMode = Config.GetBindable<PlayMode>(OsuConfig.PlayMode);

            Add(new Drawable[] {
                new VolumeControlReceptor
                {
                    RelativeSizeAxes = Axes.Both,
                    ActivateRequested = delegate { volume.Show(); }
                },
                mainContent = new Container
                {
                    RelativeSizeAxes = Axes.Both,
                },
                volume = new VolumeControl
                {
                    VolumeGlobal = Audio.Volume,
                    VolumeSample = Audio.VolumeSample,
                    VolumeTrack = Audio.VolumeTrack
                },
                new GlobalHotkeys //exists because UserInputManager is at a level below us.
                {
                    Handler = globalHotkeyPressed
                }
            });

            (Options = new OptionsOverlay { Depth = float.MaxValue / 2 }).Preload(game, Add);

            (intro = new Intro
            {
                Beatmap = Beatmap
            }).Preload(game, d =>
            {
                mainContent.Add(d);

                intro.ModePushed += modeAdded;
                intro.Exited += modeRemoved;
                intro.DisplayAsRoot();
            });

            (Chat = new ChatConsole(API)).Preload(game, Add);
            (MusicController = new MusicController()).Preload(game, Add);

            (Toolbar = new Toolbar
            {
                OnHome = delegate { MainMenu?.MakeCurrent(); },
                OnSettings = Options.ToggleVisibility,
                OnPlayModeChange = delegate (PlayMode m) { PlayMode.Value = m; },
                OnMusicController = MusicController.ToggleVisibility
            }).Preload(game, t =>
            {
                PlayMode.ValueChanged += delegate { Toolbar.SetGameMode(PlayMode.Value); };
                PlayMode.TriggerChange();
                Add(Toolbar);
            });

            Cursor.Alpha = 0;
        }

        private bool globalHotkeyPressed(InputState state, KeyDownEventArgs args)
        {
            switch (args.Key)
            {
                case Key.F8:
                    Chat.ToggleVisibility();
                    return true;
            }

            if (state.Keyboard.ControlPressed)
            {
                switch (args.Key)
                {
                    case Key.O:
                        Options.ToggleVisibility();
                        return true;
                }
            }

            return base.OnKeyDown(state, args);
        }

        public Action<GameMode> ModeChanged;

        private Container mainContent;

        private void modeChanged(GameMode newMode)
        {
            // - Ability to change window size
            // - Ability to adjust music playback
            // - Frame limiter changes

            //central game mode change logic.
            if (newMode is Player || newMode is Intro)
            {
                Toolbar.State = Visibility.Hidden;
                Chat.State = Visibility.Hidden;
            }
            else
            {
                Toolbar.State = Visibility.Visible;
            }

            Cursor.FadeIn(100);

            ModeChanged?.Invoke(newMode);

            if (newMode == null)
                Host.Exit();
        }

        protected override bool OnExiting()
        {
            if (!intro.DidLoadMenu || intro.ChildGameMode != null)
            {
                Scheduler.Add(delegate
                {
                    intro.MakeCurrent();
                });
                return true;
            }

            return base.OnExiting();
        }

        private void modeAdded(GameMode newMode)
        {
            newMode.ModePushed += modeAdded;
            newMode.Exited += modeRemoved;

            modeChanged(newMode);
        }

        private void modeRemoved(GameMode newMode)
        {
            modeChanged(newMode);
        }

        public override bool Invalidate(Invalidation invalidation = Invalidation.All, Drawable source = null, bool shallPropagate = true)
        {
            if (!base.Invalidate(invalidation, source, shallPropagate)) return false;

            if (Parent != null)
            {
                Config.Set(OsuConfig.Width, DrawSize.X);
                Config.Set(OsuConfig.Height, DrawSize.Y);
            }
            return true;
        }
    }
}