using System.Threading.Tasks;
using Content.Server.Clothing.Components;
using Content.Server.Items;
using Content.Server.PowerCell.Components;
using Content.Shared.ActionBlocker;
using Content.Shared.Actions;
using Content.Shared.Actions.Behaviors.Item;
using Content.Shared.Actions.Components;
using Content.Shared.Examine;
using Content.Shared.Interaction;
using Content.Shared.Light.Component;
using Content.Shared.Popups;
using Content.Shared.Rounding;
using Content.Shared.Sound;
using JetBrains.Annotations;
using Robust.Server.GameObjects;
using Robust.Shared.Audio;
using Robust.Shared.GameObjects;
using Robust.Shared.IoC;
using Robust.Shared.Localization;
using Robust.Shared.Maths;
using Robust.Shared.Player;
using Robust.Shared.Serialization.Manager.Attributes;
using Robust.Shared.Utility;
using Robust.Shared.Utility.Markup;
using Robust.Shared.ViewVariables;

namespace Content.Server.Light.Components
{
    /// <summary>
    ///     Component that represents a powered handheld light source which can be toggled on and off.
    /// </summary>
    [RegisterComponent]
#pragma warning disable 618
    internal sealed class HandheldLightComponent : SharedHandheldLightComponent, IUse, IExamine, IInteractUsing
#pragma warning restore 618
    {
        [Dependency] private readonly IEntityManager _entMan = default!;

        [ViewVariables(VVAccess.ReadWrite)] [DataField("wattage")] public float Wattage { get; set; } = 3f;
        [ViewVariables] private PowerCellSlotComponent _cellSlot = default!;
        private PowerCellComponent? Cell => _cellSlot.Cell;

        /// <summary>
        ///     Status of light, whether or not it is emitting light.
        /// </summary>
        [ViewVariables]
        public bool Activated { get; private set; }

        [ViewVariables] protected override bool HasCell => _cellSlot.HasCell;

        [ViewVariables(VVAccess.ReadWrite)] [DataField("turnOnSound")] public SoundSpecifier TurnOnSound = new SoundPathSpecifier("/Audio/Items/flashlight_on.ogg");
        [ViewVariables(VVAccess.ReadWrite)] [DataField("turnOnFailSound")] public SoundSpecifier TurnOnFailSound = new SoundPathSpecifier("/Audio/Machines/button.ogg");
        [ViewVariables(VVAccess.ReadWrite)] [DataField("turnOffSound")] public SoundSpecifier TurnOffSound = new SoundPathSpecifier("/Audio/Items/flashlight_off.ogg");

        [ComponentDependency] private readonly ItemActionsComponent? _itemActions = null;

        /// <summary>
        ///     Client-side ItemStatus level
        /// </summary>
        private byte? _lastLevel;

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

            Owner.EnsureComponent<PointLightComponent>();
            _cellSlot = Owner.EnsureComponent<PowerCellSlotComponent>();

            Dirty();
        }

        protected override void OnRemove()
        {
            base.OnRemove();
            _entMan.EventBus.QueueEvent(EventSource.Local, new DeactivateHandheldLightMessage(this));
        }

        async Task<bool> IInteractUsing.InteractUsing(InteractUsingEventArgs eventArgs)
        {
            if (!EntitySystem.Get<ActionBlockerSystem>().CanInteract(eventArgs.User)) return false;
            if (!_cellSlot.InsertCell(eventArgs.Using)) return false;
            Dirty();
            return true;
        }

        void IExamine.Examine(FormattedMessage.Builder message, bool inDetailsRange)
        {
            if (Activated)
            {
                message.AddMarkup(Loc.GetString("handheld-light-component-on-examine-is-on-message"));
            }
            else
            {
                message.AddMarkup(Loc.GetString("handheld-light-component-on-examine-is-off-message"));
            }
        }

        bool IUse.UseEntity(UseEntityEventArgs eventArgs)
        {
            return ToggleStatus(eventArgs.User);
        }

        /// <summary>
        ///     Illuminates the light if it is not active, extinguishes it if it is active.
        /// </summary>
        /// <returns>True if the light's status was toggled, false otherwise.</returns>
        public bool ToggleStatus(EntityUid user)
        {
            if (!EntitySystem.Get<ActionBlockerSystem>().CanUse(user)) return false;
            return Activated ? TurnOff() : TurnOn(user);
        }

        public bool TurnOff(bool makeNoise = true)
        {
            if (!Activated)
            {
                return false;
            }

            SetState(false);
            Activated = false;
            UpdateLightAction();
            _entMan.EventBus.QueueEvent(EventSource.Local, new DeactivateHandheldLightMessage(this));

            if (makeNoise)
            {
                SoundSystem.Play(Filter.Pvs(Owner), TurnOffSound.GetSound(), Owner);
            }

            return true;
        }

        public bool TurnOn(EntityUid user)
        {
            if (Activated)
            {
                return false;
            }

            if (Cell == null)
            {
                SoundSystem.Play(Filter.Pvs(Owner), TurnOnFailSound.GetSound(), Owner);
                Owner.PopupMessage(user, Loc.GetString("handheld-light-component-cell-missing-message"));
                UpdateLightAction();
                return false;
            }

            // To prevent having to worry about frame time in here.
            // Let's just say you need a whole second of charge before you can turn it on.
            // Simple enough.
            if (Wattage > Cell.CurrentCharge)
            {
                SoundSystem.Play(Filter.Pvs(Owner), TurnOnFailSound.GetSound(), Owner);
                Owner.PopupMessage(user, Loc.GetString("handheld-light-component-cell-dead-message"));
                UpdateLightAction();
                return false;
            }

            Activated = true;
            UpdateLightAction();
            SetState(true);
            _entMan.EventBus.QueueEvent(EventSource.Local, new ActivateHandheldLightMessage(this));

            SoundSystem.Play(Filter.Pvs(Owner), TurnOnSound.GetSound(), Owner);
            return true;
        }

        private void SetState(bool on)
        {
            if (_entMan.TryGetComponent(Owner, out SpriteComponent? sprite))
            {
                sprite.LayerSetVisible(1, on);
            }

            if (_entMan.TryGetComponent(Owner, out PointLightComponent? light))
            {
                light.Enabled = on;
            }

            if (_entMan.TryGetComponent(Owner, out ClothingComponent? clothing))
            {
                clothing.ClothingEquippedPrefix = Loc.GetString(on ? "on" : "off");
            }

            if (_entMan.TryGetComponent(Owner, out ItemComponent? item))
            {
                item.EquippedPrefix = Loc.GetString(on ? "on" : "off");
            }
        }

        private void UpdateLightAction()
        {
            _itemActions?.Toggle(ItemActionType.ToggleLight, Activated);
        }

        public void OnUpdate(float frameTime)
        {
            if (Cell == null)
            {
                TurnOff(false);
                return;
            }

            var appearanceComponent = _entMan.GetComponent<AppearanceComponent>(Owner);

            if (Cell.MaxCharge - Cell.CurrentCharge < Cell.MaxCharge * 0.70)
            {
                appearanceComponent.SetData(HandheldLightVisuals.Power, HandheldLightPowerStates.FullPower);
            }
            else if (Cell.MaxCharge - Cell.CurrentCharge < Cell.MaxCharge * 0.90)
            {
                appearanceComponent.SetData(HandheldLightVisuals.Power, HandheldLightPowerStates.LowPower);
            }
            else
            {
                appearanceComponent.SetData(HandheldLightVisuals.Power, HandheldLightPowerStates.Dying);
            }

            if (Activated && !Cell.TryUseCharge(Wattage * frameTime)) TurnOff(false);

            var level = GetLevel();

            if (level != _lastLevel)
            {
                _lastLevel = level;
                Dirty();
            }
        }

        // Curently every single flashlight has the same number of levels for status and that's all it uses the charge for
        // Thus we'll just check if the level changes.
        private byte? GetLevel()
        {
            if (Cell == null)
                return null;

            var currentCharge = Cell.CurrentCharge;

            if (MathHelper.CloseToPercent(currentCharge, 0) || Wattage > currentCharge)
                return 0;

            return (byte?) ContentHelpers.RoundToNearestLevels(currentCharge / Cell.MaxCharge * 255, 255, StatusLevels);
        }

        public override ComponentState GetComponentState()
        {
            return new HandheldLightComponentState(GetLevel());
        }
    }

    [UsedImplicitly]
    [DataDefinition]
    public class ToggleLightAction : IToggleItemAction
    {
        public bool DoToggleAction(ToggleItemActionEventArgs args)
        {
            if (!IoCManager.Resolve<IEntityManager>().TryGetComponent<HandheldLightComponent?>(args.Item, out var lightComponent)) return false;
            if (lightComponent.Activated == args.ToggledOn) return false;
            return lightComponent.ToggleStatus(args.Performer);
        }
    }

    internal sealed class ActivateHandheldLightMessage : EntityEventArgs
    {
        public HandheldLightComponent Component { get; }

        public ActivateHandheldLightMessage(HandheldLightComponent component)
        {
            Component = component;
        }
    }

    internal sealed class DeactivateHandheldLightMessage : EntityEventArgs
    {
        public HandheldLightComponent Component { get; }

        public DeactivateHandheldLightMessage(HandheldLightComponent component)
        {
            Component = component;
        }
    }
}