using System;
using Server.ContextMenus;
using Server.Mobiles;
using Server.SkillHandlers;
using Server.Spells.Chivalry;
using Server.Spells.Necromancy;
using Server.Spells.Ninjitsu;
using Server.Targeting;

/*
 * There really was no prettier way to do this,  other than the one
 * suggestion to make a rigged baseninjaweapon class that bypasses its
 * own serialization, due to the way these weapons were originaly coded.
 */

namespace Server.Items
{
  public interface INinjaAmmo : IUsesRemaining
  {
    int PoisonCharges{ get; set; }
    Poison Poison{ get; set; }
  }

  public interface INinjaWeapon : IUsesRemaining
  {
    int NoFreeHandMessage{ get; }
    int EmptyWeaponMessage{ get; }
    int RecentlyUsedMessage{ get; }
    int FullWeaponMessage{ get; }
    int WrongAmmoMessage{ get; }
    Type AmmoType{ get; }
    int PoisonCharges{ get; set; }
    Poison Poison{ get; set; }
    int WeaponDamage{ get; }
    int WeaponMinRange{ get; }
    int WeaponMaxRange{ get; }

    void AttackAnimation(Mobile from, Mobile to);
  }

  public class NinjaWeapon
  {
    private const int MaxUses = 10;

    public static void AttemptShoot(PlayerMobile from, INinjaWeapon weapon)
    {
      if (CanUseWeapon(from, weapon))
        from.BeginTarget(weapon.WeaponMaxRange, false, TargetFlags.Harmful, OnTarget, weapon);
    }

    private static void Shoot(PlayerMobile from, Mobile target, INinjaWeapon weapon)
    {
      if (from != target && CanUseWeapon(from, weapon) && from.CanBeHarmful(target))
      {
        if (weapon.WeaponMinRange == 0 || !from.InRange(target, weapon.WeaponMinRange))
        {
          from.NinjaWepCooldown = true;

          from.Direction = from.GetDirectionTo(target);

          from.RevealingAction();

          weapon.AttackAnimation(from, target);

          ConsumeUse(weapon);

          if (CombatCheck(from, target))
            Timer.DelayCall(TimeSpan.FromSeconds(1.0), () => OnHit(from, target, weapon));

          Timer.DelayCall(TimeSpan.FromSeconds(2.5), ResetUsing, from);
        }
        else
        {
          from.SendLocalizedMessage(1063303); // Your target is too close!
        }
      }
    }

    private static void ResetUsing(PlayerMobile from)
    {
      from.NinjaWepCooldown = false;
    }

    private static void Unload(Mobile from, INinjaWeapon weapon)
    {
      if (weapon.UsesRemaining > 0)
      {
        INinjaAmmo ammo = Activator.CreateInstance(weapon.AmmoType, weapon.UsesRemaining) as INinjaAmmo;

        ammo.Poison = weapon.Poison;
        ammo.PoisonCharges = weapon.PoisonCharges;

        from.AddToBackpack((Item)ammo);

        weapon.UsesRemaining = 0;
        weapon.PoisonCharges = 0;
        weapon.Poison = null;
      }
    }

    private static void Reload(PlayerMobile from, INinjaWeapon weapon, INinjaAmmo ammo)
    {
      if (weapon.UsesRemaining < MaxUses)
      {
        int need = Math.Min(MaxUses - weapon.UsesRemaining, ammo.UsesRemaining);

        if (need > 0)
        {
          if (weapon.Poison != null && (ammo.Poison == null || weapon.Poison.Level > ammo.Poison.Level))
          {
            from.SendLocalizedMessage(1070767); // Loaded projectile is stronger, unload it first
          }
          else
          {
            if (weapon.UsesRemaining > 0)
              if (weapon.Poison == null && ammo.Poison != null
                  || weapon.Poison != null && ammo.Poison != null && weapon.Poison.Level != ammo.Poison.Level)
              {
                Unload(from, weapon);
                need = Math.Min(MaxUses, ammo.UsesRemaining);
              }

            int poisonneeded = Math.Min(MaxUses - weapon.PoisonCharges, ammo.PoisonCharges);

            weapon.UsesRemaining += need;
            weapon.PoisonCharges += poisonneeded;

            if (weapon.PoisonCharges > 0) weapon.Poison = ammo.Poison;

            ammo.PoisonCharges -= poisonneeded;
            ammo.UsesRemaining -= need;

            if (ammo.UsesRemaining < 1)
              ((Item)ammo).Delete();
            else if (ammo.PoisonCharges < 1) ammo.Poison = null;
          }
        } // "else" here would mean they targeted "ammo" with 0 uses.  undefined behavior.
      }
      else
      {
        from.SendLocalizedMessage(weapon.FullWeaponMessage);
      }
    }

    private static void ConsumeUse(INinjaWeapon weapon)
    {
      if (weapon.UsesRemaining > 0)
      {
        weapon.UsesRemaining--;

        if (weapon.UsesRemaining < 1)
        {
          weapon.PoisonCharges = 0;
          weapon.Poison = null;
        }
      }
    }

    private static bool CanUseWeapon(PlayerMobile from, INinjaWeapon weapon)
    {
      if (WeaponIsValid(weapon, from))
      {
        if (weapon.UsesRemaining > 0)
        {
          if (!from.NinjaWepCooldown)
          {
            if (BasePotion.HasFreeHand(from)) return true;

            from.SendLocalizedMessage(weapon.NoFreeHandMessage);
          }
          else
          {
            from.SendLocalizedMessage(weapon.RecentlyUsedMessage);
          }
        }
        else
        {
          from.SendLocalizedMessage(weapon.EmptyWeaponMessage);
        }
      }

      return false;
    }

    private static bool CombatCheck(Mobile attacker, Mobile defender) /* mod'd from baseweapon */
    {
      BaseWeapon defWeapon = defender.Weapon as BaseWeapon;

      Skill atkSkill = defender.Skills.Ninjitsu;
      // Skill defSkill = defender.Skills[defWeapon.Skill];

      double atSkillValue = attacker.Skills.Ninjitsu.Value;
      double defSkillValue = defWeapon?.GetDefendSkillValue(attacker, defender) ?? 0.0;

      if (defSkillValue <= -20.0) defSkillValue = -19.9;

      double attackValue = AosAttributes.GetValue(attacker, AosAttribute.AttackChance);

      if (DivineFurySpell.UnderEffect(attacker)) attackValue += 10;

      if (AnimalForm.UnderTransformation(attacker, typeof(GreyWolf)) ||
          AnimalForm.UnderTransformation(attacker, typeof(BakeKitsune))) attackValue += 20;

      if (HitLower.IsUnderAttackEffect(attacker)) attackValue -= 25;

      if (attackValue > 45) attackValue = 45;

      attackValue = (atSkillValue + 20.0) * (100 + attackValue);

      double defenseValue = AosAttributes.GetValue(defender, AosAttribute.DefendChance);

      if (DivineFurySpell.UnderEffect(defender)) defenseValue -= 20;

      if (HitLower.IsUnderDefenseEffect(defender)) defenseValue -= 25;

      int refBonus = 0;

      if (Block.GetBonus(defender, ref refBonus)) defenseValue += refBonus;

      if (Discordance.GetEffect(attacker, ref refBonus)) defenseValue -= refBonus;

      if (defenseValue > 45) defenseValue = 45;

      defenseValue = (defSkillValue + 20.0) * (100 + defenseValue);

      double chance = attackValue / (defenseValue * 2.0);

      if (chance < 0.02) chance = 0.02;

      return attacker.CheckSkill(atkSkill.SkillName, chance);
    }

    private static void OnHit(Mobile from, Mobile target, INinjaWeapon weapon)
    {
      if (!from.CanBeHarmful(target))
        return;
      from.DoHarmful(target);

      AOS.Damage(target, from, weapon.WeaponDamage, 100, 0, 0, 0, 0);

      if (weapon.Poison != null && weapon.PoisonCharges > 0)
      {
        if (EvilOmenSpell.TryEndEffect(target))
          target.ApplyPoison(from, Poison.GetPoison(weapon.Poison.Level + 1));
        else
          target.ApplyPoison(from, weapon.Poison);

        weapon.PoisonCharges--;

        if (weapon.PoisonCharges < 1) weapon.Poison = null;
      }
    }

    private static void OnTarget(Mobile from, object targeted, INinjaWeapon weapon)
    {
      PlayerMobile player = from as PlayerMobile;

      if (WeaponIsValid(weapon, from))
      {
        if (targeted is Mobile mobile)
          Shoot(player, mobile, weapon);
        else if (targeted.GetType() == weapon.AmmoType)
          Reload(player, weapon, (INinjaAmmo)targeted);
        else
          player.SendLocalizedMessage(weapon.WrongAmmoMessage);
      }
    }

    private static bool WeaponIsValid(INinjaWeapon weapon, Mobile from)
    {
      Item item = weapon as Item;

      return !item.Deleted && item.RootParent == from;
    }

    public class LoadEntry : ContextMenuEntry
    {
      private INinjaWeapon weapon;

      public LoadEntry(INinjaWeapon wep, int entry)
        : base(entry, 0)
      {
        weapon = wep;
      }

      public override void OnClick()
      {
        if (WeaponIsValid(weapon, Owner.From))
          Owner.From.BeginTarget(10, false, TargetFlags.Harmful, OnTarget, weapon);
      }
    }

    public class UnloadEntry : ContextMenuEntry
    {
      private INinjaWeapon weapon;

      public UnloadEntry(INinjaWeapon wep, int entry)
        : base(entry, 0)
      {
        weapon = wep;

        Enabled = weapon.UsesRemaining > 0;
      }

      public override void OnClick()
      {
        if (WeaponIsValid(weapon, Owner.From)) Unload(Owner.From, weapon);
      }
    }
  }
}