// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE

using System.Collections.Generic;
using System.Linq;
using osu.Framework.Allocation;
using osu.Framework.Configuration;
using osu.Framework.Extensions.IEnumerableExtensions;
using osu.Framework.Graphics;
using osu.Framework.Input;
using osu.Framework.MathUtils;
using osu.Game.Beatmaps;
using osu.Game.Beatmaps.ControlPoints;
using osu.Game.Input.Handlers;
using osu.Game.Rulesets.Mania.Beatmaps;
using osu.Game.Rulesets.Mania.Configuration;
using osu.Game.Rulesets.Mania.Mods;
using osu.Game.Rulesets.Mania.Objects;
using osu.Game.Rulesets.Mania.Objects.Drawables;
using osu.Game.Rulesets.Mania.Replays;
using osu.Game.Rulesets.Mania.Scoring;
using osu.Game.Rulesets.Objects.Drawables;
using osu.Game.Rulesets.Objects.Types;
using osu.Game.Rulesets.Replays;
using osu.Game.Rulesets.Scoring;
using osu.Game.Rulesets.UI;
using osu.Game.Rulesets.UI.Scrolling;
using OpenTK;

namespace osu.Game.Rulesets.Mania.UI
{
    public class ManiaRulesetContainer : ScrollingRulesetContainer<ManiaPlayfield, ManiaHitObject>
    {
        public new ManiaBeatmap Beatmap => (ManiaBeatmap)base.Beatmap;

        public IEnumerable<BarLine> BarLines;

        private readonly Bindable<ManiaScrollingDirection> configDirection = new Bindable<ManiaScrollingDirection>();
        private ScrollingInfo scrollingInfo;

        public ManiaRulesetContainer(Ruleset ruleset, WorkingBeatmap beatmap)
            : base(ruleset, beatmap)
        {
            // Generate the bar lines
            double lastObjectTime = (Objects.LastOrDefault() as IHasEndTime)?.EndTime ?? Objects.LastOrDefault()?.StartTime ?? double.MaxValue;

            var timingPoints = Beatmap.ControlPointInfo.TimingPoints;
            var barLines = new List<BarLine>();

            for (int i = 0; i < timingPoints.Count; i++)
            {
                TimingControlPoint point = timingPoints[i];

                // Stop on the beat before the next timing point, or if there is no next timing point stop slightly past the last object
                double endTime = i < timingPoints.Count - 1 ? timingPoints[i + 1].Time - point.BeatLength : lastObjectTime + point.BeatLength * (int)point.TimeSignature;

                int index = 0;
                for (double t = timingPoints[i].Time; Precision.DefinitelyBigger(endTime, t); t += point.BeatLength, index++)
                {
                    barLines.Add(new BarLine
                    {
                        StartTime = t,
                        ControlPoint = point,
                        BeatIndex = index
                    });
                }
            }

            BarLines = barLines;
        }

        [BackgroundDependencyLoader]
        private void load()
        {
            BarLines.ForEach(Playfield.Add);

            ((ManiaConfigManager)Config).BindWith(ManiaSetting.ScrollDirection, configDirection);
            configDirection.BindValueChanged(d => scrollingInfo.Direction.Value = (ScrollingDirection)d, true);
        }

        private DependencyContainer dependencies;

        protected override IReadOnlyDependencyContainer CreateChildDependencies(IReadOnlyDependencyContainer parent)
        {
            dependencies = new DependencyContainer(base.CreateChildDependencies(parent));
            dependencies.CacheAs<IScrollingInfo>(scrollingInfo = new ScrollingInfo());
            return dependencies;
        }

        protected sealed override Playfield CreatePlayfield() => new ManiaPlayfield(scrollingInfo.Direction, Beatmap.Stages)
        {
            Anchor = Anchor.Centre,
            Origin = Anchor.Centre,
        };

        public override ScoreProcessor CreateScoreProcessor() => new ManiaScoreProcessor(this);

        public override int Variant => (int)(Mods.OfType<IPlayfieldTypeMod>().FirstOrDefault()?.PlayfieldType ?? PlayfieldType.Single) + Beatmap.TotalColumns;

        public override PassThroughInputManager CreateInputManager() => new ManiaInputManager(Ruleset.RulesetInfo, Variant);

        protected override DrawableHitObject<ManiaHitObject> GetVisualRepresentation(ManiaHitObject h)
        {
            switch (h)
            {
                case HoldNote holdNote:
                    return new DrawableHoldNote(holdNote);
                case Note note:
                    return new DrawableNote(note);
                default:
                    return null;
            }
        }

        protected override Vector2 PlayfieldArea => new Vector2(1, 0.8f);

        protected override ReplayInputHandler CreateReplayInputHandler(Replay replay) => new ManiaFramedReplayInputHandler(replay);

        private class ScrollingInfo : IScrollingInfo
        {
            public readonly Bindable<ScrollingDirection> Direction = new Bindable<ScrollingDirection>();
            IBindable<ScrollingDirection> IScrollingInfo.Direction => Direction;
        }
    }
}