using System.Diagnostics.CodeAnalysis;
using Content.Shared.Chemistry.Components;
using Content.Shared.Chemistry.Components.SolutionManager;
using Content.Shared.Chemistry.EntitySystems;
using Content.Shared.Construction;
using Content.Shared.Containers.ItemSlots;
using Content.Shared.Destructible;
using Content.Shared.FixedPoint;
using Content.Shared.Gibbing;
using Content.Shared.Interaction;
using Content.Shared.Popups;
using Content.Shared.Random.Helpers;
using Content.Shared.Storage;
using Content.Shared.Tools.Components;
using Content.Shared.Verbs;
using Robust.Shared.Audio;
using Robust.Shared.Audio.Systems;
using Robust.Shared.Containers;
using Robust.Shared.Physics.Systems;
using Robust.Shared.Random;
using Robust.Shared.Timing;

namespace Content.Shared.Tools.Systems;

public sealed partial class ToolRefinableSystem : EntitySystem
{
    [Dependency] private SharedToolSystem _toolSystem = default!;
    [Dependency] private GibbingSystem _gib = default!;
    [Dependency] private SharedPopupSystem _popup = default!;
    [Dependency] private SharedAudioSystem _audio = default!;
    [Dependency] private SharedContainerSystem _container = default!;
    [Dependency] private SharedPhysicsSystem _physics = default!;
    [Dependency] private SharedSolutionContainerSystem _solutionContainer = default!;
    [Dependency] private SharedDestructibleSystem _destructible = default!;
    [Dependency] private IGameTiming _gameTiming = default!;

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

        SubscribeLocalEvent<ToolRefinableComponent, GetVerbsEvent<InteractionVerb>>(AddVerb);
        SubscribeLocalEvent<ToolRefinableComponent, InteractUsingEvent>(OnInteractUsing, after: [typeof(ItemSlotsSystem)]);
        SubscribeLocalEvent<ToolRefinableComponent, ToolRefineDoAfterEvent>(OnDoAfter);
    }

    #region Subscriptions

    /// <summary> Normal interactions. </summary>
    private void OnInteractUsing(Entity<ToolRefinableComponent> ent, ref InteractUsingEvent args)
    {
        if (args.Handled || !_toolSystem.HasQuality(args.Used, ent.Comp.QualityNeeded))
            return;

        var component = ent.Comp;
        var uid = ent.Owner;
        var attemptEvent = new AttemptToolRefineEvent(args.Used);
        RaiseLocalEvent(args.Target, ref attemptEvent);
        if (attemptEvent.IsCancelled)
        {
            _popup.PopupEntity(attemptEvent.BlockCause, args.User, args.User);
            return;
        }

        args.Handled = UseTool(uid, component, args.Used, args.User);
    }

    /// <summary> Verb interactions. </summary>
    private void AddVerb(Entity<ToolRefinableComponent> ent, ref GetVerbsEvent<InteractionVerb> args)
    {
        var used = args.Using;
        var component = ent.Comp;

        if (ent.Comp.VerbText == null || !args.CanInteract || !args.CanAccess)
            return;

        var user = args.User;

        // Decide what we use as a tool and can it be used for refinement
        var tool = used ?? user;
        var verbDisabled = false;
        string? verbMessage = null;

        if (!_toolSystem.HasQuality(tool, ent.Comp.QualityNeeded))
        {
            verbDisabled = true;
            verbMessage = ent.Comp.ToolMissingQualityTooltip == null
                ? null
                : Loc.GetString(ent.Comp.ToolMissingQualityTooltip, ("target", ent.Owner));
        }
        else
        {
            // We have the necessary tool, make an attempt to ensure refinement is not blocked.
            var attemptEvent = new AttemptToolRefineEvent(tool);
            RaiseLocalEvent(args.Target, ref attemptEvent);

            if (attemptEvent.IsCancelled)
            {
                verbDisabled = true;
                verbMessage = attemptEvent.BlockCause;
            }
        }

        verbMessage ??= component.VerbDefaultTooltip == null
            ? null
            : Loc.GetString(component.VerbDefaultTooltip.Value);

        InteractionVerb verb = new()
        {
            Text = Loc.GetString(ent.Comp.VerbText),
            Icon = ent.Comp.VerbIcon,
            Disabled = verbDisabled,
            Message = verbMessage,
            Act = () =>
            {
                if (!verbDisabled)
                    UseTool(ent, ent, tool, user);
            },
        };
        args.Verbs.Add(verb);
    }

    /// <summary> DoAfter for refining. </summary>
    private void OnDoAfter(Entity<ToolRefinableComponent> ent, ref ToolRefineDoAfterEvent args)
    {
        if (args.Cancelled || args.Used == null || !args.Target.HasValue)
            return;

        var component = ent.Comp;
        var uid = ent.Owner;

        var getIsBlocked = new AttemptToolRefineEvent(args.Used.Value);
        RaiseLocalEvent(args.Target.Value, ref getIsBlocked);
        if (getIsBlocked.IsCancelled)
        {
            _popup.PopupEntity(getIsBlocked.BlockCause, args.User, args.User);
            return;
        }

        PopupOnRefine(ent, args.Used.Value, args.User);

        var ev = new BeforeToolRefinedEvent(args.User);
        RaiseLocalEvent(uid, ref ev);

        if (ev.Cancelled)
            return;

        if (component.RefineResult.Count == 0)
            Log.Warning($"Attempted to refine {ToPrettyString(ent)}, but no spawns were supplied. Refining should leave results.");
        else
        {
            // TODO: Use RandomPredicted https://github.com/space-wizards/RobustToolbox/pull/5849
            var rndSeed = SharedRandomExtensions.HashCodeCombine((int)_gameTiming.CurTick.Value, args.User.Id, uid.Id);
            var rng = new RobustRandom();
            rng.SetSeed(rndSeed);
            SpawnRefinement(component.RefineResult, uid, rng);
        }

        if (component.Sound != null)
            _audio.PlayPredicted(component.Sound, Transform(uid).Coordinates, args.User, AudioParams.Default.WithVolume(-2));

        _gib.Gib(uid);
        _destructible.DestroyEntity(uid);
    }

    private void SpawnRefinement(List<EntitySpawnEntry> spawnList, EntityUid source, IRobustRandom rng)
    {
        var spawns = EntitySpawnCollection.GetSpawns(spawnList, rng);
        var spawned = new List<EntityUid>(spawns.Count);

        if (_container.TryGetContainingContainer(source, out var container))
            _container.Remove((source, null, null), container);

        foreach (var protoId in spawns)
        {
            var refineResultUid = PredictedSpawnNextToOrDrop(protoId, source);
            spawned.Add(refineResultUid);

            if (container == null || !_container.Insert(refineResultUid, container))
            {
                var randVect = rng.NextVector2(2.0f, 2.5f);
                _physics.SetLinearVelocity(refineResultUid, randVect);
            }
        }

        if (!TryComp<ToolRefinableSolutionComponent>(source, out var comp))
            return;

        if (!TryGetSourceSolutionForTransfer(source, comp.SolutionToSplit, out var solutionInfo))
            return;

        var (sourceSoln, sourceSolution) = solutionInfo.Value;

        for (var i = spawned.Count; i > 0; i--)
        {
            var spawnedUid = spawned[i - 1];
            var refineResultVolume = sourceSolution.Volume / FixedPoint2.New(i);
            var lostSolution = _solutionContainer.SplitSolution(sourceSoln, refineResultVolume);
            FillResult(spawnedUid, comp.SolutionToSet, lostSolution);
        }
    }

    #endregion

    /// <summary>
    /// Show popup on finishing refining.
    /// </summary>
    /// <param name="ent">Entity that was refined.</param>
    /// <param name="used">Tool that was used to do refinement.</param>
    /// <param name="user">Entity that initiated refine process.</param>
    private void PopupOnRefine(Entity<ToolRefinableComponent> ent, EntityUid used, EntityUid user)
    {
        var component = ent.Comp;
        var uid = ent.Owner;

        var slicingDoneMessageForUser = component.PopupForUser == null
            ? null
            : Loc.GetString(component.PopupForUser, ("target", uid), ("tool", used));
        var slicingDoneMessageForOthers = component.PopupForOther == null
            ? null
            : Loc.GetString(component.PopupForOther, ("user", user), ("target", uid), ("tool", used));

        _popup.PopupEntity(slicingDoneMessageForUser, slicingDoneMessageForOthers, user, user, component.PopupType);
    }

    /// <summary>
    /// Gets solution for transferring reagents into refine result from entity that was refined.
    /// </summary>
    /// <param name="source">Entity that is getting refined.</param>
    /// <param name="solutionName">Solution name (key) which should be used in process.</param>
    /// <param name="solutionInfo">
    /// Solution extra data that was extracted from <see cref="SolutionManagerComponent"/>
    /// (or null if there were no <see cref="SolutionManagerComponent"/> set or if there were
    /// no solution with name <see cref="solutionName"/>).
    /// </param>
    /// <returns></returns>
    private bool TryGetSourceSolutionForTransfer(
        EntityUid source,
        string solutionName,
        [NotNullWhen(true)] out (Entity<SolutionComponent> sourceSoln, Solution sourceSolution)? solutionInfo
    )
    {
        solutionInfo = default;

        if (!_solutionContainer.TryGetSolution(source, solutionName, out var sourceSoln, out var sourceSolution))
            return false;

        solutionInfo = (sourceSoln.Value, sourceSolution);
        return true;
    }

    /// <summary>
    /// Fills refine result entity with reagents from refined entity solution.
    /// </summary>
    /// <param name="refineResultUid">Entity to fill.</param>
    /// <param name="solutionName">Solution to which reagents should be added.</param>
    /// <param name="solution">Solution that should be used as source.</param>
    private void FillResult(EntityUid refineResultUid, string solutionName, Solution solution)
    {
        if (!_solutionContainer.TryGetSolution(refineResultUid, solutionName, out var itsSoln, out var itsSolution))
            return;

        _solutionContainer.RemoveAllSolution(itsSoln.Value);

        var lostSolutionPart = solution.SplitSolution(itsSolution.AvailableVolume);
        _solutionContainer.TryAddSolution(itsSoln.Value, lostSolutionPart);
    }

    private bool UseTool(EntityUid uid, ToolRefinableComponent component, EntityUid used, EntityUid user)
    {
        return _toolSystem.UseTool(
            used,
            user,
            uid,
            component.RefineTime,
            [component.QualityNeeded],
            new ToolRefineDoAfterEvent(),
            out _,
            fuel: component.RefineFuel
        );
    }
}

/// <summary>
/// Event for checking if tool refining of entity is blocked in some complex way.
/// </summary>
[ByRefEvent]
public record struct AttemptToolRefineEvent(
    EntityUid Using,
    bool IsCancelled = false,
    string? BlockCause = null
);

/// <summary>
/// Called after slicing of the entity.
/// </summary>
[ByRefEvent]
public record struct BeforeToolRefinedEvent(EntityUid User)
{
    public bool Cancelled;
}