using System.Diagnostics.CodeAnalysis;
using Content.Shared.StatusEffectNew.Components;
using Robust.Shared.Prototypes;

namespace Content.Shared.StatusEffectNew;

public abstract partial class SharedStatusEffectsSystem
{
    /// <summary>
    /// Increments duration of status effect by <see cref="duration"/>.
    /// Tries to add status effect if it is not yet present on entity.
    /// </summary>
    /// <param name="target">The target entity to which the effect should be added.</param>
    /// <param name="effectProto">ProtoId of the status effect entity. Make sure it has StatusEffectComponent on it.</param>
    /// <param name="duration">Duration of status effect. Leave null and the effect will be permanent until it is removed using <c>TryRemoveStatusEffect</c>.</param>
    /// <param name="statusEffect">The EntityUid of the status effect we have just created or null if it doesn't exist.</param>
    /// <returns>True if effect exists and its duration is set properly, false in case effect cannot be applied.</returns>
    public bool TryAddStatusEffectDuration(
        EntityUid target,
        EntProtoId effectProto,
        [NotNullWhen(true)] out EntityUid? statusEffect,
        TimeSpan duration
    )
    {
        if (!TryGetStatusEffect(target, effectProto, out statusEffect))
            return TryAddStatusEffect(target, effectProto, out statusEffect, duration);

        AddStatusEffectTime(statusEffect.Value, duration);

        return true;
    }


    ///<inheritdoc cref="TryAddStatusEffectDuration(Robust.Shared.GameObjects.EntityUid,Robust.Shared.Prototypes.EntProtoId,out Robust.Shared.GameObjects.EntityUid?,System.TimeSpan)"/>
    public bool TryAddStatusEffectDuration(EntityUid target, EntProtoId effectProto, TimeSpan duration)
    {
        return TryAddStatusEffectDuration(target, effectProto, out _, duration);
    }

    /// <summary>
    /// Sets duration of status effect by <see cref="duration"/>.
    /// Tries to add status effect if it is not yet present on entity.
    /// </summary>
    /// <param name="target">The target entity to which the effect should be added.</param>
    /// <param name="effectProto">ProtoId of the status effect entity. Make sure it has StatusEffectComponent on it.</param>
    /// <param name="duration">Duration of status effect. Leave null and the effect will be permanent until it is removed using <c>TryRemoveStatusEffect</c>.</param>
    /// <param name="statusEffect">The EntityUid of the status effect we have just created or null if it doesn't exist.</param>
    /// <returns>True if effect exists and its duration is set properly, false in case effect cannot be applied.</returns>
    public bool TrySetStatusEffectDuration(
        EntityUid target,
        EntProtoId effectProto,
        [NotNullWhen(true)] out EntityUid? statusEffect,
        TimeSpan? duration = null
    )
    {
        if (!TryGetStatusEffect(target, effectProto, out statusEffect))
            return TryAddStatusEffect(target, effectProto, out statusEffect, duration);

        SetStatusEffectTime(statusEffect.Value, duration);

        return true;
    }

    /// <inheritdoc cref="TrySetStatusEffectDuration(Robust.Shared.GameObjects.EntityUid,Robust.Shared.Prototypes.EntProtoId,out Robust.Shared.GameObjects.EntityUid?,System.TimeSpan?)"/>
    public bool TrySetStatusEffectDuration(EntityUid target, EntProtoId effectProto, TimeSpan? duration = null)
    {
        return TrySetStatusEffectDuration(target, effectProto, out _, duration);
    }

    /// <summary>
    /// Updates duration of effect to larger value between provided <see cref="duration"/> and current effect duration.
    /// Tries to add status effect if it is not yet present on entity.
    /// </summary>
    /// <param name="target">The target entity to which the effect should be added.</param>
    /// <param name="effectProto">ProtoId of the status effect entity. Make sure it has StatusEffectComponent on it.</param>
    /// <param name="duration">Duration of status effect. Leave null and the effect will be permanent until it is removed using <c>TryRemoveStatusEffect</c>.</param>
    /// <param name="statusEffect">The EntityUid of the status effect we have just created or null if it doesn't exist.</param>
    /// <returns>True if effect exists and its duration is set properly, false in case effect cannot be applied.</returns>
    public bool TryUpdateStatusEffectDuration(
        EntityUid target,
        EntProtoId effectProto,
        [NotNullWhen(true)] out EntityUid? statusEffect,
        TimeSpan? duration = null
    )
    {
        if (!TryGetStatusEffect(target, effectProto, out statusEffect))
            return TryAddStatusEffect(target, effectProto, out statusEffect, duration);

        UpdateStatusEffectTime(statusEffect.Value, duration);

        return true;
    }

    /// <inheritdoc cref="TryUpdateStatusEffectDuration(Robust.Shared.GameObjects.EntityUid,Robust.Shared.Prototypes.EntProtoId,out Robust.Shared.GameObjects.EntityUid?,System.TimeSpan?)"/>
    public bool TryUpdateStatusEffectDuration(EntityUid target, EntProtoId effectProto, TimeSpan? duration = null)
    {
        return TryUpdateStatusEffectDuration(target, effectProto, out _, duration);
    }

    /// <summary>
    /// Attempting to remove a status effect from an entity.
    /// Returns True if the status effect existed on the entity and was successfully removed, and False in otherwise.
    /// </summary>
    public bool TryRemoveStatusEffect(EntityUid target, EntProtoId effectProto)
    {
        if (_net.IsClient) //We cant remove the effect on the client (we need someone more robust at networking than me)
            return false;

        if (!_containerQuery.TryComp(target, out var container))
            return false;

        foreach (var effect in container.ActiveStatusEffects)
        {
            var meta = MetaData(effect);
            if (meta.EntityPrototype is not null && meta.EntityPrototype == effectProto)
            {
                if (!_effectQuery.TryComp(effect, out var effectComp))
                    return false;

                var ev = new StatusEffectRemovedEvent(target);
                RaiseLocalEvent(effect, ref ev);

                QueueDel(effect);
                container.ActiveStatusEffects.Remove(effect);
                Dirty(target, container);
                return true;
            }
        }

        return false;
    }

    /// <summary>
    /// Checks whether the specified entity is under a specific status effect.
    /// </summary>
    public bool HasStatusEffect(EntityUid target, EntProtoId effectProto)
    {
        if (!_containerQuery.TryComp(target, out var container))
            return false;

        foreach (var effect in container.ActiveStatusEffects)
        {
            var meta = MetaData(effect);
            if (meta.EntityPrototype is not null && meta.EntityPrototype == effectProto)
                return true;
        }

        return false;
    }

    /// <summary>
    /// Attempting to retrieve the EntityUid of a status effect from an entity.
    /// </summary>
    public bool TryGetStatusEffect(EntityUid target, EntProtoId effectProto, [NotNullWhen(true)] out EntityUid? effect)
    {
        effect = null;
        if (!_containerQuery.TryComp(target, out var container))
            return false;

        foreach (var e in container.ActiveStatusEffects)
        {
            var meta = MetaData(e);
            if (meta.EntityPrototype is not null && meta.EntityPrototype == effectProto)
            {
                effect = e;
                return true;
            }
        }

        return false;
    }

    /// <summary>
    /// Attempting to retrieve the time of a status effect from an entity.
    /// </summary>
    /// <param name="uid">The target entity on which the effect is applied.</param>
    /// <param name="effectProto">The prototype ID of the status effect to retrieve.</param>
    /// <param name="time">The output tuple containing the effect entity and its remaining time.</param>
    /// <param name="container">Optional. The status effect container component of the entity.</param>
    public bool TryGetTime(
        EntityUid uid,
        EntProtoId effectProto,
        out (EntityUid EffectEnt, TimeSpan? EndEffectTime) time,
        StatusEffectContainerComponent? container = null
    )
    {
        time = default;
        if (!Resolve(uid, ref container))
            return false;

        foreach (var effect in container.ActiveStatusEffects)
        {
            var meta = MetaData(effect);
            if (meta.EntityPrototype is not null && meta.EntityPrototype == effectProto)
            {
                if (!_effectQuery.TryComp(effect, out var effectComp))
                    return false;

                time = (effect, effectComp.EndEffectTime);
                return true;
            }
        }

        return false;
    }

    /// <summary>
    /// Attempts to get the maximum time left for a given Status Effect Component, returns false if no such
    /// component exists.
    /// </summary>
    /// <param name="uid">The target entity on which the effect is applied.</param>
    /// <param name="time">Returns the EntityUid of the status effect with the most time left, and the end effect time
    /// of that status effect.</param>
    /// <returns> True if a status effect entity with the given component exists</returns>
    public bool TryGetMaxTime<T>(EntityUid uid, out (EntityUid EffectEnt, TimeSpan? EndEffectTime) time) where T : IComponent
    {
        time = default;
        if (!TryEffectsWithComp<T>(uid, out var status))
            return false;

        time.Item2 = TimeSpan.Zero;

        foreach (var effect in status)
        {
            if (effect.Comp2.EndEffectTime == null)
            {
                time = (effect.Owner, null);
                return true;
            }

            if (effect.Comp2.EndEffectTime > time.Item2)
                time = (effect.Owner, effect.Comp2.EndEffectTime);
        }
        return true;
    }

    /// <summary>
    /// Attempts to edit the remaining time for a status effect on an entity.
    /// </summary>
    /// <param name="uid">The target entity on which the effect is applied.</param>
    /// <param name="effectProto">The prototype ID of the status effect to modify.</param>
    /// <param name="time">
    /// The time adjustment to apply to the status effect. Positive values extend the duration,
    /// while negative values reduce it.
    /// </param>
    /// <returns> True if duration was edited successfully, false otherwise.</returns>
    public bool TryAddTime(EntityUid uid, EntProtoId effectProto, TimeSpan time)
    {
        if (!_containerQuery.TryComp(uid, out var container))
            return false;

        foreach (var effect in container.ActiveStatusEffects)
        {
            var meta = MetaData(effect);
            if (meta.EntityPrototype is not null && meta.EntityPrototype == effectProto)
            {
                AddStatusEffectTime(effect, time);
                return true;
            }
        }
        return false;
    }

    /// <summary>
    /// Attempts to set the remaining time for a status effect on an entity.
    /// </summary>
    /// <param name="uid">The target entity on which the effect is applied.</param>
    /// <param name="effectProto">The prototype ID of the status effect to modify.</param>
    /// <param name="time">The new duration for the status effect.</param>
    /// <returns> True if duration was set successfully, false otherwise.</returns>
    public bool TrySetTime(EntityUid uid, EntProtoId effectProto, TimeSpan time)
    {
        if (!_containerQuery.TryComp(uid, out var container))
            return false;

        foreach (var effect in container.ActiveStatusEffects)
        {
            var meta = MetaData(effect);
            if (meta.EntityPrototype is not null && meta.EntityPrototype == effectProto)
            {
                SetStatusEffectTime(effect, time);
                return true;
            }
        }
        return false;
    }

    /// <summary>
    /// Checks if the specified component is present on any of the entity's status effects.
    /// </summary>
    public bool HasEffectComp<T>(EntityUid? target) where T : IComponent
    {
        if (!_containerQuery.TryComp(target, out var container))
            return false;

        foreach (var effect in container.ActiveStatusEffects)
        {
            if (HasComp<T>(effect))
                return true;
        }

        return false;
    }

    /// <summary>
    /// Returns all status effects that have the specified component.
    /// </summary>
    public bool TryEffectsWithComp<T>(EntityUid? target, [NotNullWhen(true)] out HashSet<Entity<T, StatusEffectComponent>>? effects) where T : IComponent
    {
        effects = null;
        if (!_containerQuery.TryComp(target, out var container))
            return false;

        foreach (var effect in container.ActiveStatusEffects)
        {
            if (!_effectQuery.TryComp(effect, out var statusComp))
                continue;

            if (TryComp<T>(effect, out var comp))
            {
                effects ??= [];
                effects.Add((effect, comp, statusComp));
            }
        }

        return effects is not null;
    }

    /// <summary>
    /// Helper function for calculating how long it takes for all effects with a particular component to disappear. Useful for overlays.
    /// </summary>
    /// <param name="target">An entity from which status effects are checked.</param>
    /// <param name="endTime">The farthest end time of effects with this component is returned. Can be null if one of the effects is infinite.</param>
    /// <returns>True if effects with the specified component were found, or False if there are no such effects.</returns>
    public bool TryGetEffectsEndTimeWithComp<T>(EntityUid? target, out TimeSpan? endTime) where T : IComponent
    {
        endTime = _timing.CurTime;
        if (!_containerQuery.TryComp(target, out var container))
            return false;

        foreach (var effect in container.ActiveStatusEffects)
        {
            if (!HasComp<T>(effect))
                continue;

            if (!_effectQuery.TryComp(effect, out var statusComp))
                continue;

            if (statusComp.EndEffectTime is null)
            {
                endTime = null;
                return true; //This effect never ends, so we return null at endTime, but return true that there is time.
            }

            if (statusComp.EndEffectTime > endTime)
                endTime = statusComp.EndEffectTime;
        }

        return endTime is not null;
    }
}