/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using MessagePack;
using Newtonsoft.Json;
using CultMath;
using static CultMath.math;

public abstract class Behavior
{
    public BehaviorData Data { get; }
    public EquippedItem Item { get; }
    private ConsumableItemEffect Consumable { get; }
    protected ItemManager ItemManager { get; }

    protected Entity Entity => Item?.Entity ?? Consumable.Entity;
    public float Temperature => Item?.Temperature ?? Consumable.Entity.MaxTemp;

    public float3 Direction
    {
        get
        {
            if(Item != null)
            {
                var itemDirection = Entity.Direction.Rotate(Item.EquippableItem.Rotation);
                return float3(itemDirection.x, 0, itemDirection.y);
            }

            return float3(Entity.Direction.x, 0, Entity.Direction.y);
        }
    }

    protected Behavior(BehaviorData data, EquippedItem item)
    {
        Data = data;
        Item = item;
        ItemManager = Item.ItemManager;
    }
    
    protected Behavior(BehaviorData data, ConsumableItemEffect consumable)
    {
        Data = data;
        Consumable = consumable;
        ItemManager = consumable.Entity.ItemManager;
    }
    
    public float Evaluate(PerformanceStat stat) => Item?.Evaluate(stat) ?? Consumable.Evaluate(stat);

    // Nominal-request ruling (docs/stats-and-power-cut.md, operator ruling 2026-09-19): the read a PowerRequest
    // implementation uses for a stat named in StatValidation.PowerRequestFields, in place of Evaluate above. A
    // consumable-hosted instance (Item == null) never reaches PowerBus.Step at all (see e.g. EnergyDraw.Execute's
    // own comment), and ConsumableItemEffect.PowerSupplyFactor is already the identity (1) unconditionally, so
    // Consumable.Evaluate is already nominal with respect to power and needs no separate context.
    public float EvaluateNominalPower(PerformanceStat stat) => Item?.EvaluateNominalPower(stat) ?? Consumable.Evaluate(stat);
    protected void AddHeat(float heat) => Item?.AddHeat(heat); // TODO: Heat for Consumables

    protected void CauseDamage(float damage)
    {
        if (Item != null)
        {
            Item.EquippableItem.Durability -= damage;
            Entity.ItemDamage.OnNext((Item, damage));
        }
        else
        {
            Consumable.Entity.Hull.Durability -= damage;
            Consumable.Entity.HullDamage.OnNext(damage);
        }
    }

    protected void CauseWearDamage(float multiplier)
    {
        if (Item != null)
        {
            CauseDamage(Item.Wear * multiplier);
        }
    }
    
    public virtual bool Execute(float dt)
    {
        return true;
    }
}

public interface IActivatedBehavior
{
    void Activate();
    void Deactivate();
}

public interface IAnalogBehavior
{
    float Axis { get; set; }
}

public interface IEventBehavior
{
    void ResetEvents();
}

public interface IInitializableBehavior
{
    void Initialize();
}

public interface IInteractiveBehavior
{
    bool Exposed { get; }
}

public interface IAlwaysUpdatedBehavior
{
    void Update(float delta);
}

public interface IProgressBehavior
{
    float Progress { get; }
}

public interface IPopulationAssignment
{
    int AssignedPopulation { get; set; }
}

// Cut 3 (docs/stats-and-power-cut.md §1.2): a behaviour that wants to draw from its entity's PowerBus declares a
// request instead of spending energy itself. PowerBus.Step calls this on every consumer once per tick, before
// any behaviour's Execute runs, so PowerRequest must be computable from state that is already current at that
// point -- a resolved stat and, where the map calls for one, a behaviour-supplied scalar such as Thruster's
// throttle axis (set externally before the tick) -- never from work Execute itself would otherwise do. The
// behaviour reads back how much of its own request was granted from Item.PowerSupply during its own Execute.
//
// Cut 5 (docs/stats-and-power-cut.md §1.3): every kind of consumer also names the priority tier (PowerTiers.cs)
// it defaults to. EquippedItem reads this exactly once, to seed EquippableItem.PowerTier the first time an item
// without a player-chosen tier gets equipped -- after that the stored field is what PowerBus reads, never this.
public interface IPowerConsumer
{
    float PowerRequest(float dt);
    int DefaultPowerTier { get; }
}

[Inspectable, 
 Union(0, typeof(GuidedWeaponData)),
 Union(1, typeof(LauncherData)),
 Union(2, typeof(ReactorData)), 
 Union(3, typeof(RadiatorData)), 
 Union(4, typeof(StatModifierData)), 
 Union(5, typeof(SensorData)),
 Union(6, typeof(ReflectorData)),
 Union(7, typeof(ShieldData)),
 Union(8, typeof(ThrusterData)),
 Union(9, typeof(WearData)),
 Union(10, typeof(VelocityConversionData)),
 Union(11, typeof(VelocityLimitData)),
 // Union(12): retired, do not reuse -- was AetherDriveData (retire-longinusx; parked/aether-drive)
 // Union(14, typeof(TowingControllerData)),
 Union(15, typeof(CooldownData)),
 Union(16, typeof(HeatData)),
 // Union(17, typeof(HitscanData)),
 Union(18, typeof(ItemUsageData)),
 //Union(19, typeof(RadianceData)),
 Union(20, typeof(SwitchData)),
 Union(21, typeof(TriggerData)),
 Union(22, typeof(VisibilityData)),
 Union(23, typeof(ThermotoggleData)),
 Union(24, typeof(EnergyDrawData)),
 // Union(25, typeof(MiningControllerData)),
 // Union(26): retired, do not reuse -- was the "hit it with a tool" behavior deleted in Cut 2 (docs/mining-cut.md, Q1=A).
 // Union(27, typeof(SurveyControllerData)),
 Union(28, typeof(ResourceScannerData)),
 // Union(29, typeof(WanderControllerData)),
 // Union(30, typeof(HaulingControllerData)),
 Union(31, typeof(CapacitorData)),
 Union(32, typeof(CockpitData)),
 Union(33, typeof(HeatStorageData)),
 Union(34, typeof(TurretControllerData)),
 Union(35, typeof(InstantWeaponData)),
 Union(36, typeof(ConstantWeaponData)),
 Union(37, typeof(ChargedWeaponData)),
 Union(38, typeof(AutoWeaponData)),
 // Cut 2 (docs/fire-control-cut.md): 39 is the next free index against this list, not the 39 the
 // superseded draft quoted -- checked directly here rather than trusted from that document.
 Union(39, typeof(TargetingSystemData)),
 Union(40, typeof(MineLayerData)),
 Union(41, typeof(ThrottleLockData)),
 Union(42, typeof(VapourDumpData)),
 JsonObject(MemberSerialization.OptIn)]
public abstract class BehaviorData
{
    [Inspectable, JsonProperty("group"), Key(0)]
    public int Group;
    
    public abstract Behavior CreateInstance(EquippedItem item);
    public abstract Behavior CreateInstance(ConsumableItemEffect consumable);

    public override string ToString()
    {
        return base.ToString().FormatTypeName();
    }
}