using System.Collections;
using System.Collections.Generic;
using UnityEngine;

namespace Saltosion.OneWeapon {
    public class BloodLauncher : MonoBehaviour {
        private static BloodLauncher Singleton;
        public GameObject StructuralParticlePrefab;
        public GameObject BloodParticlePrefab;
        public GameObject CensoredBloodParticlePrefab;
        public Transform ParticleRoot;
        public int MaxParticles;
        public bool DebugLaunch = false;

        public static void Splatter(Vector2 origin, Vector2 direction, int particleCount, float force, float degrees, bool sticky = true) {
            LaunchParticles(Singleton.GetGorePrefab(), origin, direction, particleCount, force, degrees, sticky);
        }

        public static void DebrisExplode(Vector2 origin, Vector2 direction, int particleCount, float force, float degrees, bool sticky = true) {
            LaunchParticles(Singleton.StructuralParticlePrefab, origin, direction, particleCount, force, degrees, sticky);
        }

        private static void LaunchParticles(GameObject prefab, Vector2 origin, Vector2 direction, int particleCount, float force, float degrees, bool sticky) {
            for (int i = 0; i < (int)(particleCount * Singleton.GetParticleCountMultiplier()); i++) {
                if (Singleton.ParticleRoot.childCount >= Singleton.MaxParticles) {
                    Destroy(Singleton.ParticleRoot.GetChild((int)(Random.value * Singleton.ParticleRoot.childCount)).gameObject);
                }
                GameObject Obj = Instantiate(prefab, origin, new Quaternion(), Singleton.ParticleRoot);
                BloodParticle Particle = Obj.GetComponent<BloodParticle>();
                float Intensity = Mathf.Pow(Random.value, 0.8f) * force;
                float Cone = degrees / 360.0f;
                float Offset = Mathf.Atan2(direction.y, direction.x);
                float Radians = Offset + Mathf.Pow(Cone * (Random.value - 0.5f) * 2f, 2f) * Mathf.PI * 2.0f;
                Particle.LaunchForce = new Vector2(Mathf.Cos(Radians), Mathf.Sin(Radians)) * Intensity;
                Particle.GetsStuck = sticky && Random.value < 0.5;
            }
        }

        private void Start() {
            Singleton = this;
        }

        private GameObject GetGorePrefab() {
            return Options.CensorGore ? CensoredBloodParticlePrefab : BloodParticlePrefab;
        }

        private float GetParticleCountMultiplier() {
            return Options.CensorGore ? 0.1f : 1.5f;
        }
    }
}