using System;
using Microsoft.Xna.Framework;
using Terraria;
using Terraria.DataStructures;
using Terraria.ID;
using Terraria.ModLoader;
using ForgottenWawiTech.Content.Projectiles.Transcendent;

namespace ForgottenWawiTech.Content.Players
{
    public class TranscendentPlayer : ModPlayer
    {
        private const int AccessoryShardInterval = 90;
        private const int SetShardInterval = 45;
        private const int AccessoryShardBaseDamage = 220;
        private const int SetShardBaseDamage = 320;
        private const int AscendantDroneCount = 4;
        private const int AscendantDroneBaseDamage = 360;
        private const int NaniteShardBaseDamage = 260;

        public bool SwarmModuleEquipped;
        private Item swarmAccessorySourceItem;
        private int swarmTimer;
        private int naniteShardCooldown;

        private bool transcendentSetActive;

        public void HandleSwarmAccessory(Item sourceItem)
        {
            SwarmModuleEquipped = true;
            swarmAccessorySourceItem = sourceItem;
        }

        public void EnableTranscendentSet()
        {
            transcendentSetActive = true;
        }

        public bool HasTranscendentSet => transcendentSetActive;

        public override void ResetEffects()
        {
            SwarmModuleEquipped = false;
            transcendentSetActive = false;
            swarmAccessorySourceItem = null;
        }

        public override void PostUpdate()
        {
            bool swarmActive = SwarmModuleEquipped || transcendentSetActive;

            if (swarmActive && Player.whoAmI == Main.myPlayer)
            {
                int interval = transcendentSetActive ? SetShardInterval : AccessoryShardInterval;
                swarmTimer++;
                if (swarmTimer >= interval)
                {
                    swarmTimer = 0;
                    SpawnAscendantShards(transcendentSetActive);
                }
            }
            else if (Player.whoAmI == Main.myPlayer && swarmTimer > 0)
            {
                swarmTimer = 0;
            }

            if (naniteShardCooldown > 0)
            {
                naniteShardCooldown--;
            }

            if (transcendentSetActive)
            {
                MaintainAscendantDrones();
            }

            if (swarmActive)
            {
                if (Main.rand.NextBool(transcendentSetActive ? 4 : 6))
                {
                    Dust dust = Dust.NewDustDirect(Player.position, Player.width, Player.height, DustID.RainbowTorch, Player.velocity.X * 0.2f, Player.velocity.Y * 0.2f, 150, default, 1.1f);
                    dust.noGravity = true;
                }
            }
        }

        private void SpawnAscendantShards(bool fromSet)
        {
            int baseDamage = fromSet ? SetShardBaseDamage : AccessoryShardBaseDamage;
            int damage = (int)Player.GetDamage(DamageClass.Summon).ApplyTo(baseDamage);
            float knockBack = fromSet ? 4f : 3f;
            float speed = fromSet ? 8f : 6f;
            int shardCount = fromSet ? 2 : 1;

            if (!fromSet && swarmAccessorySourceItem == null)
            {
                swarmAccessorySourceItem = Player.HeldItem;
            }

            IEntitySource source = fromSet
                ? Player.GetSource_Misc("TranscendentAscendantSwarm")
                : Player.GetSource_Accessory(swarmAccessorySourceItem ?? Player.HeldItem);

            for (int i = 0; i < shardCount; i++)
            {
                Vector2 velocity = Main.rand.NextVector2Circular(speed, speed);
                if (velocity.LengthSquared() < 0.01f)
                {
                    velocity = new Vector2(0f, -speed);
                }

                Projectile shard = Projectile.NewProjectileDirect(
                    source,
                    Player.Center,
                    velocity,
                    ModContent.ProjectileType<TranscendentBladeShard>(),
                    damage,
                    knockBack,
                    Player.whoAmI);
                shard.originalDamage = damage;
            }
        }

        private void MaintainAscendantDrones()
        {
            if (Player.whoAmI != Main.myPlayer)
            {
                return;
            }

            int droneType = ModContent.ProjectileType<TranscendentAscendantDrone>();
            int owned = Player.ownedProjectileCounts[droneType];
            if (owned >= AscendantDroneCount)
            {
                return;
            }

            var source = Player.GetSource_Misc("TranscendentAscendantDrones");
            for (int i = owned; i < AscendantDroneCount; i++)
            {
                Projectile.NewProjectile(
                    source,
                    Player.Center,
                    Vector2.Zero,
                    droneType,
                    0,
                    0f,
                    Player.whoAmI,
                    i,
                    AscendantDroneCount);
            }
        }

        public override void OnHitNPC(NPC target, NPC.HitInfo hit, int damageDone)
        {
            TrySpawnNaniteShards(target.Center, damageDone);
        }

        public override void OnHitNPCWithProj(Projectile proj, NPC target, NPC.HitInfo hit, int damageDone)
        {
            if (proj.owner != Player.whoAmI || !proj.friendly)
            {
                return;
            }

            if (proj.type == ModContent.ProjectileType<TranscendentNaniteShard>() ||
                proj.type == ModContent.ProjectileType<TranscendentAscendantBolt>() ||
                proj.type == ModContent.ProjectileType<TranscendentBladeShard>())
            {
                return;
            }

            TrySpawnNaniteShards(target.Center, damageDone);
        }

        private void TrySpawnNaniteShards(Vector2 position, int damageDone)
        {
            if (!transcendentSetActive || Player.whoAmI != Main.myPlayer)
            {
                return;
            }

            if (damageDone <= 0 || naniteShardCooldown > 0)
            {
                return;
            }

            naniteShardCooldown = 8;
            int baseDamage = GetNaniteShardDamage(Player);
            int computed = Math.Max(baseDamage, damageDone / 2);
            float speed = 13f;
            var source = Player.GetSource_Misc("TranscendentNaniteShards");

            for (int i = 0; i < 2; i++)
            {
                Vector2 velocity = Main.rand.NextVector2CircularEdge(1f, 1f) * speed;
                if (velocity.LengthSquared() < 0.01f)
                {
                    velocity = new Vector2(0f, -speed);
                }

                Projectile shard = Projectile.NewProjectileDirect(
                    source,
                    position,
                    velocity,
                    ModContent.ProjectileType<TranscendentNaniteShard>(),
                    computed,
                    2f,
                    Player.whoAmI);
                shard.originalDamage = computed;
            }
        }

        public static int GetAscendantDroneDamage(Player player)
        {
            return (int)player.GetTotalDamage(DamageClass.Summon).ApplyTo(AscendantDroneBaseDamage);
        }

        public static int GetNaniteShardDamage(Player player)
        {
            return (int)player.GetTotalDamage(DamageClass.Generic).ApplyTo(NaniteShardBaseDamage);
        }
    }
}