using System;
using Content.Shared.Disposal;
using Content.Shared.Disposal.Components;
using Robust.Client.AutoGenerated;
using Robust.Client.Graphics;
using Robust.Client.UserInterface.Controls;
using Robust.Client.UserInterface.CustomControls;
using Robust.Client.UserInterface.XAML;
using Robust.Shared.IoC;
using Robust.Shared.Maths;
using Robust.Shared.Timing;
using static Content.Shared.Disposal.Components.SharedDisposalUnitComponent;

namespace Content.Client.Disposal.UI
{
    /// <summary>
    /// Client-side UI used to control a <see cref="SharedDisposalUnitComponent"/>
    /// </summary>
    [GenerateTypedNameReferences]
    public partial class DisposalUnitWindow : SS14Window
    {
        public Button Engage => EngageProtected;
        public Button Eject => EjectProtected;
        public Button Power => PowerProtected;

        public DisposalUnitWindow()
        {
            IoCManager.InjectDependencies(this);
            RobustXamlLoader.Load(this);
        }

        private void UpdatePressureBar(float pressure)
        {
            PressureBar.Value = pressure;

            var normalized = pressure / PressureBar.MaxValue;

            const float leftHue = 0.0f; // Red
            const float middleHue = 0.066f; // Orange
            const float rightHue = 0.33f; // Green
            const float saturation = 1.0f; // Uniform saturation
            const float value = 0.8f; // Uniform value / brightness
            const float alpha = 1.0f; // Uniform alpha

            // These should add up to 1.0 or your transition won't be smooth
            const float leftSideSize = 0.5f; // Fraction of _chargeBar lerped from leftHue to middleHue
            const float rightSideSize = 0.5f; // Fraction of _chargeBar lerped from middleHue to rightHue

            float finalHue;
            if (normalized <= leftSideSize)
            {
                normalized /= leftSideSize; // Adjust range to 0.0 to 1.0
                finalHue = MathHelper.Lerp(leftHue, middleHue, normalized);
            }
            else
            {
                normalized = (normalized - leftSideSize) / rightSideSize; // Adjust range to 0.0 to 1.0.
                finalHue = MathHelper.Lerp(middleHue, rightHue, normalized);
            }

            // Check if null first to avoid repeatedly creating this.
            PressureBar.ForegroundStyleBoxOverride ??= new StyleBoxFlat();

            var foregroundStyleBoxOverride = (StyleBoxFlat) PressureBar.ForegroundStyleBoxOverride;
            foregroundStyleBoxOverride.BackgroundColor =
                Color.FromHsv(new Vector4(finalHue, saturation, value, alpha));
        }

        /// <summary>
        /// Update the interface state for the disposals window.
        /// </summary>
        /// <returns>true if we should stop updating every frame.</returns>
        public bool UpdateState(DisposalUnitBoundUserInterfaceState state)
        {
            var currentTime = IoCManager.Resolve<IGameTiming>().CurTime;
            var fullTime = state.FullPressureTime;
            var pressure = (float) Math.Min(1.0f, 1.0f - (fullTime.TotalSeconds - currentTime.TotalSeconds) * SharedDisposalUnitSystem.PressurePerSecond);

            Title = state.UnitName;
            UnitState.Text = state.UnitState;
            UpdatePressureBar(pressure);
            Power.Pressed = state.Powered;
            Engage.Pressed = state.Engaged;

            return !state.Powered || pressure >= 1.0f;
        }
    }
}