using Microsoft.Xna.Framework;
using Terraria;
using Terraria.ID;
using Terraria.ModLoader;

namespace ExampleMod.NPCs
{
	public class ExampleGlobalNPC : GlobalNPC
	{
		public override bool InstancePerEntity => true;
		
		public bool eFlames;
		public bool exampleJavelin;

		public override void ResetEffects(NPC npc) {
			eFlames = false;
			exampleJavelin = false;
		}

		public override void SetDefaults(NPC npc) {
			// We want our ExampleJavelin buff to follow the same immunities as BoneJavelin
			npc.buffImmune[mod.BuffType<Buffs.ExampleJavelin>()] = npc.buffImmune[BuffID.BoneJavelin];
		}

		public override void UpdateLifeRegen(NPC npc, ref int damage) {
			if (exampleJavelin) {
				if (npc.lifeRegen > 0) {
					npc.lifeRegen = 0;
				}
				int exampleJavelinCount = 0;
				for (int i = 0; i < 1000; i++) {
					Projectile p = Main.projectile[i];
					if (p.active && p.type == mod.ProjectileType<Projectiles.ExampleJavelinProjectile>() && p.ai[0] == 1f && p.ai[1] == npc.whoAmI) {
						exampleJavelinCount++;
					}
				}
				npc.lifeRegen -= exampleJavelinCount * 2 * 3;
				if (damage < exampleJavelinCount * 3) {
					damage = exampleJavelinCount * 3;
				}
			}
			if (eFlames) {
				if (npc.lifeRegen > 0) {
					npc.lifeRegen = 0;
				}
				npc.lifeRegen -= 16;
				if (damage < 2) {
					damage = 2;
				}
			}
		}

		public override void NPCLoot(NPC npc) {
			if (npc.lifeMax > 5 && npc.value > 0f) {
				Item.NewItem(npc.getRect(), mod.ItemType("ExampleItem"));
				if (Main.player[(int)Player.FindClosest(npc.position, npc.width, npc.height)].GetModPlayer<ExamplePlayer>().ZoneExample) {
					Item.NewItem(npc.getRect(), mod.ItemType("BossItem"));
				}
			}
			if ((npc.type == NPCID.Pumpking && Main.pumpkinMoon || npc.type == NPCID.IceQueen && Main.snowMoon) && NPC.waveNumber > 10) {
				int chance = NPC.waveNumber - 10;
				if (Main.expertMode) {
					chance++;
				}
				if (Main.rand.Next(5) < chance) {
					int stack = 1;
					if (NPC.waveNumber >= 15) {
						stack = Main.rand.Next(4, 7);
						if (Main.expertMode) {
							stack++;
						}
					}
					else if (Main.rand.NextBool()) {
						stack++;
					}
					string type = npc.type == NPCID.Pumpking ? "ScytheBlade" : "Icicle";
					Item.NewItem(npc.getRect(), mod.ItemType(type), stack);
				}
			}
			if (npc.type == NPCID.DukeFishron && !Main.expertMode) {
				Item.NewItem(npc.getRect(), mod.ItemType("Bubble"), Main.rand.Next(5, 8));
			}
			if (npc.type == NPCID.Bunny && npc.AnyInteractions()) {
				int left = (int)(npc.position.X / 16f);
				int top = (int)(npc.position.Y / 16f);
				int right = (int)((npc.position.X + npc.width) / 16f);
				int bottom = (int)((npc.position.Y + npc.height) / 16f);
				bool flag = false;
				for (int i = left; i <= right; i++) {
					for (int j = top; j <= bottom; j++) {
						Tile tile = Main.tile[i, j];
						if (tile.active() && tile.type == mod.TileType("ElementalPurge") && !NPC.AnyNPCs(mod.NPCType("PuritySpirit"))) {
							i -= Main.tile[i, j].frameX / 18;
							j -= Main.tile[i, j].frameY / 18;
							i = i * 16 + 16;
							j = j * 16 + 24 + 60;
							for (int k = 0; k < 255; k++) {
								Player player = Main.player[k];
								if (player.active && player.position.X > i - NPC.sWidth / 2 && player.position.X + player.width < i + NPC.sWidth / 2 && player.position.Y > j - NPC.sHeight / 2 && player.position.Y < j + NPC.sHeight / 2) {
									flag = true;
									break;
								}
							}
							if (flag) {
								NPC.NewNPC(i, j, mod.NPCType("PuritySpirit"));
								break;
							}
						}
					}
					if (flag) {
						break;
					}
				}
			}
		}

		public override void DrawEffects(NPC npc, ref Color drawColor) {
			if (eFlames) {
				if (Main.rand.Next(4) < 3) {
					int dust = Dust.NewDust(npc.position - new Vector2(2f, 2f), npc.width + 4, npc.height + 4, mod.DustType("EtherealFlame"), npc.velocity.X * 0.4f, npc.velocity.Y * 0.4f, 100, default(Color), 3.5f);
					Main.dust[dust].noGravity = true;
					Main.dust[dust].velocity *= 1.8f;
					Main.dust[dust].velocity.Y -= 0.5f;
					if (Main.rand.NextBool(4)) {
						Main.dust[dust].noGravity = false;
						Main.dust[dust].scale *= 0.5f;
					}
				}
				Lighting.AddLight(npc.position, 0.1f, 0.2f, 0.7f);
			}
		}

		public override void EditSpawnRate(Player player, ref int spawnRate, ref int maxSpawns) {
			if (player.GetModPlayer<ExamplePlayer>().ZoneExample) {
				spawnRate = (int)(spawnRate * 5f);
				maxSpawns = (int)(maxSpawns * 5f);
			}
		}

		public override void SetupShop(int type, Chest shop, ref int nextSlot) {
			if (type == NPCID.Dryad) {
				shop.item[nextSlot].SetDefaults(mod.ItemType<Items.CarKey>());
				nextSlot++;

				// We can use shopCustomPrice and shopSpecialCurrency to support custom prices and currency. Usually a shop sells an item for item.value. 
				// Editing item.value in SetupShop is an incorrect approach.
				shop.item[nextSlot].SetDefaults(mod.ItemType<Items.CarKey>());
				shop.item[nextSlot].shopCustomPrice = 2;
				shop.item[nextSlot].shopSpecialCurrency = CustomCurrencyID.DefenderMedals; // omit this line if shopCustomPrice should be in regular coins. 
				nextSlot++;

				shop.item[nextSlot].SetDefaults(mod.ItemType<Items.CarKey>());
				shop.item[nextSlot].shopCustomPrice = 3;
				shop.item[nextSlot].shopSpecialCurrency = ExampleMod.FaceCustomCurrencyId;
				nextSlot++;
			}
			else if (type == NPCID.Wizard && Main.expertMode) {
				shop.item[nextSlot].SetDefaults(mod.ItemType<Items.Infinity>());
				nextSlot++;
			}
			else if (type == NPCID.Stylist) {
				shop.item[nextSlot].SetDefaults(mod.ItemType<Items.ExampleHairDye>());
				nextSlot++;
			}
		}

		// Make any NPC with a chat complain to the player if they have the stinky debuff.
		public override void GetChat(NPC npc, ref string chat) {
			if (Main.LocalPlayer.HasBuff(BuffID.Stinky)) {
				switch (Main.rand.Next(3)) {
					case 0:
						chat = "Eugh, you smell of rancid fish!";
						break;
					case 1:
						chat = "What's that horrid smell?!";
						break;
					default:
						chat = "Get away from me, i'm not doing any business with you.";
						break;
				}
			}
		}

		// If the player clicks any chat button and has the stinky debuff, prevent the button from working.
		public override bool PreChatButtonClicked(NPC npc, bool firstButton) {
			return !Main.LocalPlayer.HasBuff(BuffID.Stinky);
		}
	}
}