using System;
using Decimation.Content.Tiles.ShrineoftheMoltenOne;
using Microsoft.Xna.Framework;
using Terraria;
using Terraria.ID;
using Terraria.ModLoader;

namespace Decimation.Content.NPCs
{
    // Check  line 43861 of NPC.cs
    internal class CoreSpider : ModNPC
    {
        private readonly int shootFrame = 120;
        private int _frame;

        public override void SetStaticDefaults()
        {
            DisplayName.SetDefault("Core Spider");
            Main.npcFrameCount[npc.type] = 8;
        }

        public override void SetDefaults()
        {
            npc.CloneDefaults(NPCID.BlackRecluse);
            npc.width = 84;
            npc.height = 24;
            npc.lifeMax = 750;
            animationType = NPCID.BlackRecluse;

            npc.lavaImmune = true;
            npc.buffImmune[BuffID.OnFire] = true;
            npc.buffImmune[BuffID.Burning] = true;
        }

        public override void AI()
        {
            int x = (int) npc.Center.X / 16;
            int y = (int) npc.Center.Y / 16;
            bool onWall = false;
            for (int i = x - 1; i <= x + 1; i++)
            for (int j = y - 1; j <= y + 1; j++)
                if (Main.tile[i, j].wall > 0)
                    onWall = true;

            if (Main.expertMode)
            {
                if (_frame >= shootFrame)
                {
                    if (Main.rand.Next(4) == 0)
                    {
                        Vector2 mouthPos = npc.Center + new Vector2(npc.width / 2f, 0).RotatedBy(npc.rotation);
                        Vector2 projSpeed = new Vector2(5, 0).RotatedBy(npc.rotation);

                        Projectile.NewProjectile(mouthPos, projSpeed, ProjectileID.Fireball, 130, 30);
                    }

                    _frame = 0;
                }
                else
                {
                    _frame++;
                }
            }

            if (onWall)
                npc.Transform(ModContent.NPCType<CoreSpiderWall>());
            else
                base.AI();
        }

        public override float SpawnChance(NPCSpawnInfo spawnInfo)
        {
            int x = (int) Main.LocalPlayer.position.X / 16;
            int y = (int) Main.LocalPlayer.position.Y / 16;

            int validBlockCount = 0;
            for (int i = -50 + x; i <= 50 + x; i++)
            for (int j = -50 + y; j <= 50 + y; j++)
                if (i >= 0 && i <= Main.maxTilesX && j >= 0 && j <= Main.maxTilesY)
                    if (Main.tile[i, j].type == ModContent.TileType<ShrineBrick>() ||
                        Main.tile[i, j].type == ModContent.TileType<LockedShrineDoor>() ||
                        Main.tile[i, j].type == ModContent.TileType<ShrineDoorClosed>() ||
                        Main.tile[i, j].type == ModContent.TileType<ShrineDoorOpened>() ||
                        Main.tile[i, j].type == ModContent.TileType<RedHotSpike>())
                        validBlockCount++;


            if (validBlockCount >= 15 && Main.hardMode)
                return SpawnCondition.Underworld.Chance * 2;
            return 0;
        }
    }
}