using System;
using Content.Server.Atmos;
using Content.Server.Atmos.EntitySystems;
using Content.Server.Body.Respiratory;
using Content.Server.Chemistry.EntitySystems;
using Content.Shared.Atmos;
using Content.Shared.Body.Networks;
using Content.Shared.Chemistry.Components;
using Content.Shared.Chemistry.Reagent;
using Content.Shared.FixedPoint;
using Robust.Shared.GameObjects;
using Robust.Shared.Serialization.Manager.Attributes;
using Robust.Shared.ViewVariables;

namespace Content.Server.Body.Circulatory
{
    [RegisterComponent]
    [ComponentReference(typeof(SharedBloodstreamComponent))]
    public class BloodstreamComponent : SharedBloodstreamComponent, IGasMixtureHolder
    {
        public override string Name => "Bloodstream";

        /// <summary>
        ///     Max volume of internal solution storage
        /// </summary>
        [DataField("maxVolume")] [ViewVariables]
        private FixedPoint2 _initialMaxVolume = FixedPoint2.New(250);

        /// <summary>
        ///     Internal solution for reagent storage
        /// </summary>
        [ViewVariables] private Solution? _internalSolution;

        /// <summary>
        ///     Empty volume of internal solution
        /// </summary>
        [ViewVariables]
        public FixedPoint2 EmptyVolume => _internalSolution?.AvailableVolume ?? FixedPoint2.Zero;

        [ViewVariables]
        public GasMixture Air { get; set; } = new(6)
            { Temperature = Atmospherics.NormalBodyTemperature };

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

            _internalSolution = EntitySystem.Get<SolutionContainerSystem>().EnsureSolution(Owner.Uid, DefaultSolutionName);
            if (_internalSolution != null)
            {
                _internalSolution.MaxVolume = _initialMaxVolume;
            }
        }

        /// <summary>
        ///     Attempt to transfer provided solution to internal solution.
        ///     Only supports complete transfers
        /// </summary>
        /// <param name="solution">Solution to be transferred</param>
        /// <returns>Whether or not transfer was a success</returns>
        public override bool TryTransferSolution(Solution solution)
        {
            // For now doesn't support partial transfers
            var current = _internalSolution?.CurrentVolume ?? FixedPoint2.Zero;
            var max = _internalSolution?.MaxVolume ?? FixedPoint2.Zero;
            if (solution.TotalVolume + current > max)
            {
                return false;
            }

            EntitySystem.Get<SolutionContainerSystem>().TryAddSolution(Owner.Uid, _internalSolution, solution);
            return true;
        }

        public void PumpToxins(GasMixture to)
        {
            var atmosphereSystem = EntitySystem.Get<AtmosphereSystem>();

            if (!Owner.TryGetComponent(out RespiratorComponent? metabolism))
            {
                atmosphereSystem.Merge(to, Air);
                Air.Clear();
                return;
            }

            var toxins = metabolism.Clean(this);
            var toOld = new float[to.Moles.Length];
            Array.Copy(to.Moles, toOld, toOld.Length);

            atmosphereSystem.Merge(to, toxins);

            for (var i = 0; i < toOld.Length; i++)
            {
                var newAmount = to.GetMoles(i);
                var oldAmount = toOld[i];
                var delta = newAmount - oldAmount;

                toxins.AdjustMoles(i, -delta);
            }

            atmosphereSystem.Merge(Air, toxins);
        }
    }
}