// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using osu.Framework.Allocation;
using osu.Framework.Utils;
using osu.Game.Beatmaps;
using osu.Game.Rulesets.Edit;
using osu.Game.Rulesets.Edit.Tools;
using osu.Game.Rulesets.Mania.Objects;
using osu.Game.Rulesets.Mania.UI;
using osu.Game.Rulesets.Mods;
using osu.Game.Rulesets.UI;
using osu.Game.Rulesets.UI.Scrolling;
using osu.Game.Screens.Edit;
using osu.Game.Screens.Edit.Compose.Components;
using osuTK;

namespace osu.Game.Rulesets.Mania.Edit
{
    [Cached]
    public partial class ManiaHitObjectComposer : ScrollingHitObjectComposer<ManiaHitObject>
    {
        private DrawableManiaEditorRuleset drawableRuleset = null!;

        [Resolved]
        private EditorScreenWithTimeline? screenWithTimeline { get; set; }

        public ManiaHitObjectComposer(Ruleset ruleset)
            : base(ruleset)
        {
        }

        public new ManiaPlayfield Playfield => drawableRuleset.Playfield;

        public IScrollingInfo ScrollingInfo => drawableRuleset.ScrollingInfo;

        protected override Playfield PlayfieldAtScreenSpacePosition(Vector2 screenSpacePosition) =>
            Playfield.GetColumnByPosition(screenSpacePosition);

        protected override DrawableRuleset<ManiaHitObject> CreateDrawableRuleset(Ruleset ruleset, IBeatmap beatmap, IReadOnlyList<Mod> mods) =>
            drawableRuleset = new DrawableManiaEditorRuleset(ruleset, beatmap, mods);

        protected override ComposeBlueprintContainer CreateBlueprintContainer()
            => new ManiaBlueprintContainer(this);

        protected override BeatSnapGrid CreateBeatSnapGrid() => new ManiaBeatSnapGrid();

        protected override IReadOnlyList<CompositionTool> CompositionTools => new CompositionTool[]
        {
            new NoteCompositionTool(),
            new HoldNoteCompositionTool()
        };

        public override string ConvertSelectionToString()
            => string.Join(',', EditorBeatmap.SelectedHitObjects.Cast<ManiaHitObject>().OrderBy(h => h.StartTime)
                                             .Select(h => FormattableString.Invariant($"{Math.Round(h.StartTime)}|{h.Column}")));

        // 123|0,456|1,789|2 ...
        private static readonly Regex selection_regex = new Regex(@"^\d+\|\d+(,\d+\|\d+)*$", RegexOptions.Compiled);

        public override void SelectFromTimestamp(double timestamp, string objectDescription)
        {
            if (!selection_regex.IsMatch(objectDescription))
                return;

            List<ManiaHitObject> remainingHitObjects = EditorBeatmap.HitObjects.Cast<ManiaHitObject>().Where(h => h.StartTime >= timestamp).ToList();
            string[] objectDescriptions = objectDescription.Split(',');

            for (int i = 0; i < objectDescriptions.Length; i++)
            {
                string[] split = objectDescriptions[i].Split('|');
                if (split.Length != 2)
                    continue;

                if (!int.TryParse(split[0], out int time) || !int.TryParse(split[1], out int column))
                    continue;

                ManiaHitObject? current = remainingHitObjects.FirstOrDefault(h => Precision.AlmostEquals(h.StartTime, time, 0.5) && h.Column == column);

                if (current == null)
                    continue;

                EditorBeatmap.SelectedHitObjects.Add(current);

                if (i < objectDescriptions.Length - 1)
                    remainingHitObjects = remainingHitObjects.Where(h => h != current && h.StartTime >= current.StartTime).ToList();
            }
        }

        protected override void Update()
        {
            base.Update();

            if (screenWithTimeline?.TimelineArea.Timeline != null)
                drawableRuleset.TimelineTimeRange = EditorClock.TrackLength / screenWithTimeline.TimelineArea.Timeline.CurrentZoom.Value / 2;
        }
    }
}
