using FFXIVClassic.Common;
using System;
using System.IO;

namespace  FFXIVClassic_Map_Server.packets.send.actor.battle
{
    // see xtx_command
    enum BattleActionX01PacketCommand : ushort
    {
        Disengage = 12002,
        Attack = 22104,
    }

    //These flags can be stacked and mixed, but the client will prioritize certain flags over others.
    [Flags]
    public enum HitEffect : uint
    {
        //Not setting RecoilLv2 or RecoilLv3 results in the weaker RecoilLv1.
        //These are the recoil animations that play on the target, ranging from weak to strong.
        //The recoil that gets set was likely based on the percentage of HP lost from the attack.
        RecoilLv1 = 0,
        RecoilLv2 = 1 << 0,
        RecoilLv3 = 1 << 1,

        //Setting both recoil flags triggers the "Critical!" pop-up text and hit visual effect.
        CriticalHit = RecoilLv2 | RecoilLv3,

        //Hit visual and sound effects when connecting with the target.
        //Mixing these flags together will yield different results.
        //Each visual likely relates to a specific weapon.
        //Ex: HitVisual4 flag alone appears to be the visual and sound effect for hand-to-hand attacks.
        HitVisual1 = 1 << 2,
        HitVisual2 = 1 << 3,
        HitVisual3 = 1 << 4,
        HitVisual4 = 1 << 5,

        //An additional visual effect that plays on the target when attacked if:
        //The attack is physical and they have the protect buff on.
        //The attack is magical and they have the shell buff on.
        //Special Note: Shell was removed in later versions of the game.
        //Another effect plays when both Protect and Shell flags are activated.
        //Not sure what this effect is.
        //Random guess: if the attack was a hybrid of both physical and magical and the target had both Protect and Shell buffs applied.
        Protect = 1 << 6,
        Shell = 1 << 7,
        ProtectShellSpecial = Protect | Shell,

        //Unknown = 1 << 8, -- Not sure what this flag does.

        //If only HitEffect1 is set out of the hit effects, the "Evade!" pop-up text triggers along with the evade visual.
        //If no hit effects are set, the "Miss!" pop-up is triggered and no hit visual is played.
        HitEffect1 = 1 << 9,
        HitEffect2 = 1 << 10, //Plays the standard hit visual effect, but with no sound if used alone.
        Hit = HitEffect1 | HitEffect2, //A standard hit effect with sound effect.
        HitEffect3 = 1 << 11,
        HitEffect4 = 1 << 12,
        HitEffect5 = 1 << 13,
        GustyHitEffect = HitEffect3 | HitEffect2,
        GreenTintedHitEffect = HitEffect4 | HitEffect1,

        //Knocks you back away from the attacker.
        KnockbackLv1 = HitEffect4 | HitEffect2 | HitEffect1,
        KnockbackLv2 = HitEffect4 | HitEffect3,
        KnockbackLv3 = HitEffect4 | HitEffect3 | HitEffect1,
        KnockbackLv4 = HitEffect4 | HitEffect3 | HitEffect2,
        KnockbackLv5 = HitEffect4 | HitEffect3 | HitEffect2 | HitEffect1,

        //Knocks you away from the attacker in a counter-clockwise direction.
        KnockbackCounterClockwiseLv1 = HitEffect5,
        KnockbackCounterClockwiseLv2 = HitEffect5 | HitEffect1,

        //Knocks you away from the attacker in a clockwise direction.
        KnockbackClockwiseLv1 = HitEffect5 | HitEffect2,
        KnockbackClockwiseLv2 = HitEffect5 | HitEffect2 | HitEffect1,

        //Completely drags target to the attacker, even across large distances.
        DrawIn = HitEffect5 | HitEffect3,

        //An additional visual effect that plays on the target based on according buff.
        UnknownShieldEffect = HitEffect5 | HitEffect4,
        Stoneskin = HitEffect5 | HitEffect4 | HitEffect1,

        //Unknown = 1 << 14, -- Not sure what this flag does; might be another HitEffect.

        //A special effect when performing appropriate skill combos in succession.
        //Ex: Thunder (SkillCombo1 Effect) -> Thundara (SkillCombo2 Effect) -> Thundaga (SkillCombo3 Effect)
        //Special Note: SkillCombo4 was never actually used in 1.0 since combos only chained up to 3 times maximum.
        SkillCombo1 = 1 << 15,
        SkillCombo2 = 1 << 16,
        SkillCombo3 = SkillCombo1 | SkillCombo2,
        SkillCombo4 = 1 << 17

        //Flags beyond here are unknown/untested.
    }

    class BattleActionX01Packet
    {
        public const ushort OPCODE = 0x0139;
        public const uint PACKET_SIZE = 0x58;

        public static SubPacket BuildPacket(uint playerActorID, uint sourceActorId, uint targetActorId, uint animationId, uint effectId, ushort worldMasterTextId, ushort commandId, ushort amount, byte param)
        {
            byte[] data = new byte[PACKET_SIZE - 0x20];

            using (MemoryStream mem = new MemoryStream(data))
            {
                using (BinaryWriter binWriter = new BinaryWriter(mem))
                {
                    binWriter.Write((UInt32)sourceActorId);
                    binWriter.Write((UInt32)animationId);

                    //Missing... last value is float, string in here as well?

                    binWriter.Seek(0x20, SeekOrigin.Begin);
                    binWriter.Write((UInt32)1); //Num actions (always 1 for this)
                    binWriter.Write((UInt16)commandId);
                    binWriter.Write((UInt16)0x810); //?

                    binWriter.Write((UInt32)targetActorId);

                    binWriter.Write((UInt16)amount);
                    binWriter.Write((UInt16)worldMasterTextId);

                    binWriter.Write((UInt32)effectId);

                    binWriter.Write((Byte)param);
                    binWriter.Write((Byte)1); //?
                }
            }

            return new SubPacket(OPCODE, sourceActorId, data);
        }
    }
}