using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using FFXIVClassic_Map_Server.Actors;
using FFXIVClassic_Map_Server;
using FFXIVClassic_Map_Server.utils;
using FFXIVClassic.Common;
using FFXIVClassic_Map_Server.actors.area;
using FFXIVClassic_Map_Server.packets.send.actor;

namespace FFXIVClassic_Map_Server.actors.chara.ai
{
    // todo: path flags, check for obstacles etc
    public enum PathFindFlags
    {
        None,
        Scripted = 0x01,
        IgnoreNav = 0x02,
    }
    class PathFind
    {
        private Character owner;
        private List<Vector3> path;
        private bool canFollowPath;

        private PathFindFlags pathFlags;

        public PathFind(Character owner)
        {
            this.owner = owner;
        }

        public void PreparePath(Vector3 dest, float stepSize = 0.70f, int maxPath = 40, float polyRadius = 0.0f)
        {
            PreparePath(dest.X, dest.Y, dest.Z, stepSize, maxPath, polyRadius);
        }

        // todo: is this class even needed?
        public void PreparePath(float x, float y, float z, float stepSize = 0.70f, int maxPath = 40, float polyRadius = 0.0f)
        {
            var pos = new Vector3(owner.positionX, owner.positionY, owner.positionZ);
            var dest = new Vector3(x, y, z);
            var zone = (Zone)owner.GetZone();
            var sw = new System.Diagnostics.Stopwatch();
            sw.Start();

            if ((pathFlags & PathFindFlags.IgnoreNav) != 0)
                path = new List<Vector3>(1) { new Vector3(x, y, z) };
            else
                path = NavmeshUtils.GetPath(zone, pos, dest, stepSize, maxPath, polyRadius);

            if (path != null)
            {
                if (owner.oldPositionX == 0.0f && owner.oldPositionY == 0.0f && owner.oldPositionZ == 0.0f)
                {
                    owner.oldPositionX = owner.positionX;
                    owner.oldPositionY = owner.positionY;
                    owner.oldPositionZ = owner.positionZ;
                }

                // todo: something went wrong
                if (path.Count == 0)
                {
                    owner.positionX = owner.oldPositionX;
                    owner.positionY = owner.oldPositionY;
                    owner.positionZ = owner.oldPositionZ;
                }

                sw.Stop();
                zone.pathCalls++;
                zone.pathCallTime += sw.ElapsedMilliseconds;

                if (path.Count == 1)
                    Program.Log.Info($"mypos: {owner.positionX} {owner.positionY} {owner.positionZ} | targetPos: {x} {y} {z} | step {stepSize} | maxPath {maxPath} | polyRadius {polyRadius}");

                Program.Log.Error("[{0}][{1}] Created {2} points in {3} milliseconds", owner.actorId, owner.actorName, path.Count, sw.ElapsedMilliseconds);
            }
        }

        public void PathInRange(Vector3 dest, float minRange, float maxRange)
        {
            PathInRange(dest.X, dest.Y, dest.Z, minRange, maxRange);
        }

        public void PathInRange(float x, float y, float z, float minRange, float maxRange = 5.0f)
        {
            var dest = owner.FindRandomPoint(x, y, z, minRange, maxRange);
            PreparePath(dest.X, dest.Y, dest.Z);
        }


        public void SetPathFlags(PathFindFlags flags)
        {
            this.pathFlags = flags;
        }

        public bool IsFollowingPath()
        {
            return path.Count > 0;
        }

        public bool IsFollowingScriptedPath()
        {
            return (pathFlags & PathFindFlags.Scripted) != 0;
        }

        public void FollowPath()
        {
            if (path?.Count > 0)
            {
                var point = path[0];

                owner.OnPath(point);
                owner.QueuePositionUpdate(point);
                path.Remove(point);

                if (path.Count == 0)
                    owner.LookAt(point.X, point.Y);
            }
        }

        public void Clear()
        {
            // todo:
            path?.Clear();
            pathFlags = PathFindFlags.None;
        }

        private float GetSpeed()
        {
            float baseSpeed = owner.GetSpeed();

            // todo: get actual speed crap
            if (owner.currentSubState != SetActorStatePacket.SUB_STATE_NONE)
            {
                if (owner.currentSubState == SetActorStatePacket.SUB_STATE_MONSTER)
                {
                    owner.ChangeSpeed(0.0f, SetActorSpeedPacket.DEFAULT_WALK - 2.0f, SetActorSpeedPacket.DEFAULT_RUN - 2.0f, SetActorSpeedPacket.DEFAULT_ACTIVE - 2.0f);
                }
                // baseSpeed += ConfigConstants.SPEED_MOD;
            }
            return baseSpeed;
        }
    }
}