// 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 osu.Framework.Allocation;
using osu.Framework.Bindables;
using osu.Framework.Graphics;
using osu.Framework.Input.Bindings;
using osu.Framework.Input.Events;
using osu.Game.Graphics.UserInterface;
using osu.Game.Input.Bindings;
using osu.Game.Rulesets.Edit;
using osu.Game.Rulesets.Osu.UI;
using osu.Game.Screens.Edit;
using osuTK;

namespace osu.Game.Rulesets.Osu.Edit
{
    public partial class OsuGridToolboxGroup : EditorToolboxGroup, IKeyBindingHandler<GlobalAction>
    {
        [Resolved]
        private EditorBeatmap editorBeatmap { get; set; } = null!;

        /// <summary>
        /// X position of the grid's origin.
        /// </summary>
        public BindableFloat StartPositionX { get; } = new BindableFloat(OsuPlayfield.BASE_SIZE.X / 2)
        {
            MinValue = 0f,
            MaxValue = OsuPlayfield.BASE_SIZE.X,
            Precision = 1f
        };

        /// <summary>
        /// Y position of the grid's origin.
        /// </summary>
        public BindableFloat StartPositionY { get; } = new BindableFloat(OsuPlayfield.BASE_SIZE.Y / 2)
        {
            MinValue = 0f,
            MaxValue = OsuPlayfield.BASE_SIZE.Y,
            Precision = 1f
        };

        /// <summary>
        /// The spacing between grid lines.
        /// </summary>
        public BindableFloat Spacing { get; } = new BindableFloat(4f)
        {
            MinValue = 4f,
            MaxValue = 128f,
            Precision = 1f
        };

        /// <summary>
        /// Rotation of the grid lines in degrees.
        /// </summary>
        public BindableFloat GridLinesRotation { get; } = new BindableFloat(0f)
        {
            MinValue = -45f,
            MaxValue = 45f,
            Precision = 1f
        };

        /// <summary>
        /// Read-only bindable representing the grid's origin.
        /// Equivalent to <code>new Vector2(StartPositionX, StartPositionY)</code>
        /// </summary>
        public Bindable<Vector2> StartPosition { get; } = new Bindable<Vector2>();

        /// <summary>
        /// Read-only bindable representing the grid's spacing in both the X and Y dimension.
        /// Equivalent to <code>new Vector2(Spacing)</code>
        /// </summary>
        public Bindable<Vector2> SpacingVector { get; } = new Bindable<Vector2>();

        private ExpandableSlider<float> startPositionXSlider = null!;
        private ExpandableSlider<float> startPositionYSlider = null!;
        private ExpandableSlider<float> spacingSlider = null!;
        private ExpandableSlider<float> gridLinesRotationSlider = null!;

        public OsuGridToolboxGroup()
            : base("grid")
        {
        }

        private const float max_automatic_spacing = 64;

        [BackgroundDependencyLoader]
        private void load()
        {
            Children = new Drawable[]
            {
                startPositionXSlider = new ExpandableSlider<float>
                {
                    Current = StartPositionX,
                    KeyboardStep = 1,
                },
                startPositionYSlider = new ExpandableSlider<float>
                {
                    Current = StartPositionY,
                    KeyboardStep = 1,
                },
                spacingSlider = new ExpandableSlider<float>
                {
                    Current = Spacing,
                    KeyboardStep = 1,
                },
                gridLinesRotationSlider = new ExpandableSlider<float>
                {
                    Current = GridLinesRotation,
                    KeyboardStep = 1,
                },
            };

            Spacing.Value = editorBeatmap.BeatmapInfo.GridSize;
        }

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

            StartPositionX.BindValueChanged(x =>
            {
                startPositionXSlider.ContractedLabelText = $"X: {x.NewValue:N0}";
                startPositionXSlider.ExpandedLabelText = $"X Offset: {x.NewValue:N0}";
                StartPosition.Value = new Vector2(x.NewValue, StartPosition.Value.Y);
            }, true);

            StartPositionY.BindValueChanged(y =>
            {
                startPositionYSlider.ContractedLabelText = $"Y: {y.NewValue:N0}";
                startPositionYSlider.ExpandedLabelText = $"Y Offset: {y.NewValue:N0}";
                StartPosition.Value = new Vector2(StartPosition.Value.X, y.NewValue);
            }, true);

            Spacing.BindValueChanged(spacing =>
            {
                spacingSlider.ContractedLabelText = $"S: {spacing.NewValue:N0}";
                spacingSlider.ExpandedLabelText = $"Spacing: {spacing.NewValue:N0}";
                SpacingVector.Value = new Vector2(spacing.NewValue);
                editorBeatmap.BeatmapInfo.GridSize = (int)spacing.NewValue;
            }, true);

            GridLinesRotation.BindValueChanged(rotation =>
            {
                gridLinesRotationSlider.ContractedLabelText = $"R: {rotation.NewValue:#,0.##}";
                gridLinesRotationSlider.ExpandedLabelText = $"Rotation: {rotation.NewValue:#,0.##}";
            }, true);
        }

        private void nextGridSize()
        {
            Spacing.Value = Spacing.Value * 2 >= max_automatic_spacing ? Spacing.Value / 8 : Spacing.Value * 2;
        }

        public bool OnPressed(KeyBindingPressEvent<GlobalAction> e)
        {
            switch (e.Action)
            {
                case GlobalAction.EditorCycleGridDisplayMode:
                    nextGridSize();
                    return true;
            }

            return false;
        }

        public void OnReleased(KeyBindingReleaseEvent<GlobalAction> e)
        {
        }
    }
}