using System;
using Microsoft.Xna.Framework;

using Terraria;
using Terraria.ID;
using Terraria.ModLoader;

namespace MyMod
{
    public class CactusDagger : ModProjectile
    {
        public override void SetDefaults()
        {
            projectile.name = "Cactus Dagger";
            projectile.width = 12;
            projectile.height = 12;
            projectile.penetrate = 2;
            projectile.friendly = true;
            projectile.thrown = true;
        }

        public override bool PreAI()
        {
            if (projectile.ai[0] == 0)
            {
                projectile.rotation += (Math.Abs(projectile.velocity.X) + Math.Abs(projectile.velocity.Y)) * 0.03f * (float)projectile.direction;
                projectile.localAI[1] += 1f;
                if (projectile.localAI[1] >= 20f)
                {
                    projectile.velocity.Y = projectile.velocity.Y + 0.4f;
                    projectile.velocity.X = projectile.velocity.X * 0.97f;
                }
                else
                {
                    projectile.rotation = (float)Math.Atan2((double)projectile.velocity.Y, (double)projectile.velocity.X) + 1.57f;
                }

                if (projectile.velocity.Y > 16f)
                {
                    projectile.velocity.Y = 16f;
                }
            }
            if (projectile.ai[0] == 1f)
            {
                projectile.ignoreWater = true;
                projectile.tileCollide = false;
                int num996 = 15;
                bool flag52 = false;
                bool flag53 = false;
                projectile.localAI[0] += 1f;
                if (projectile.localAI[0] % 30f == 0f)
                {
                    flag53 = true;
                }
                int num997 = (int)projectile.ai[1];
                if (projectile.localAI[0] >= (float)(60 * num996))
                {
                    flag52 = true;
                }
                else if (num997 < 0 || num997 >= 200)
                {
                    flag52 = true;
                }
                else if (Main.npc[num997].active && !Main.npc[num997].dontTakeDamage)
                {
                    projectile.Center = Main.npc[num997].Center - projectile.velocity * 2f;
                    projectile.gfxOffY = Main.npc[num997].gfxOffY;
                    if (flag53)
                    {
                        Main.npc[num997].HitEffect(0, 1.0);
                    }
                }
                else
                {
                    flag52 = true;
                }
                if (flag52)
                {
                    projectile.Kill();
                }
            }

            return false;
        }

        public override void OnHitNPC(NPC target, int damage, float knockback, bool crit)
        {
            projectile.ai[0] = 1f;
            projectile.ai[1] = (float)target.whoAmI;
            target.AddBuff(169, 900, false);
            projectile.velocity = (target.Center - projectile.Center) * 0.75f;
            projectile.netUpdate = true;
            projectile.damage = 0;
            int num31 = 6;
            Point[] array2 = new Point[num31];
            int num32 = 0;

            for (int n = 0; n < 1000; n++)
            {
                if (n != projectile.whoAmI && Main.projectile[n].active && Main.projectile[n].owner == Main.myPlayer && Main.projectile[n].type == projectile.type && Main.projectile[n].ai[0] == 1f && Main.projectile[n].ai[1] == target.whoAmI)
                {
                    array2[num32++] = new Point(n, Main.projectile[n].timeLeft);
                    if (num32 >= array2.Length)
                    {
                        break;
                    }
                }
            }
            if (num32 >= array2.Length)
            {
                int num33 = 0;
                for (int num34 = 1; num34 < array2.Length; num34++)
                {
                    if (array2[num34].Y < array2[num33].Y)
                    {
                        num33 = num34;
                    }
                }
                Main.projectile[array2[num33].X].Kill();
            }
        }

        public override void Kill(int timeLeft)
        {
            Main.PlaySound(0, (int)projectile.position.X, (int)projectile.position.Y, 1);
            Vector2 vector8 = projectile.position;
            Vector2 oldVelocity = projectile.oldVelocity;
            oldVelocity.Normalize();
            vector8 += oldVelocity * 16f;
            for (int num255 = 0; num255 < 20; num255++)
            {
                int num256 = Dust.NewDust(vector8, projectile.width, projectile.height, 81, 0f, 0f, 0, default(Color), 1f);
                Main.dust[num256].position = (Main.dust[num256].position + projectile.Center) / 2f;
                Main.dust[num256].velocity += projectile.oldVelocity * 0.4f;
                Main.dust[num256].velocity *= 0.5f;
                Main.dust[num256].noGravity = true;
                vector8 -= oldVelocity * 8f;
            }
        }
    }
}