using System;
using System.Collections.Generic;
using UnityEngine;
namespace ProjectI.Combat
{
    public static class LocalWeaponPreference
    {
        public static int First { get; set; } = 1;
        public static int Second { get; set; } = 2;
    }
    public static class WeaponRoster
    {
        private static readonly List<WeaponDefinition> entries = new List<WeaponDefinition>();
        public static IReadOnlyList<WeaponDefinition> Entries { get { Ensure(); return entries; } }
        public static WeaponDefinition Get(int id) { Ensure(); foreach (var entry in entries) if (entry.weaponId == id) return entry; return null; }
        private static void Ensure()
        {
            if (entries.Count != 0 && entries[0] != null) return;
            entries.Clear();
            var authored = Resources.Load<WeaponRosterDefinition>("WeaponRoster");
            if (authored != null && authored.weapons != null && authored.weapons.Length == 5)
            { entries.AddRange(authored.weapons); return; }
            Add(1,"Carbine",20,6,30,1.8,true,25,55,.5f,1.5f,.7f,60);
            Add(2,"Marksman rifle",40,2.8,12,2,false,40,80,.65f,1.5f,1.8f,45);
            Add(3,"Hand cannon",60,2,8,1.8,false,18,40,.4f,1.5f,2.6f,65);
            Add(4,"Shotgun",12,1.25,6,2.4,false,7,18,.15f,1.5f,3.2f,65,8,6);
            Add(5,"SMG",11,10,36,1.65,true,10,25,.35f,1.5f,.5f,65,1,1.2f);
        }
        private static void Add(int id,string name,float damage,double rate,int magazine,double reload,bool automatic,float start,float end,float floor,float weak,float recoil,float aim,int pellets=1,float spread=0)
        {
            var definition = ScriptableObject.CreateInstance<HitscanWeaponDefinition>();
            definition.hideFlags = HideFlags.HideAndDontSave;
            definition.name = name; definition.weaponId = id; definition.displayName = name; definition.damage = damage;
            definition.rateOfFire = rate; definition.magazineSize = magazine; definition.reloadDuration = reload; definition.automatic = automatic;
            definition.range = Math.Max(60,end + 20); definition.falloffStart = start; definition.falloffEnd = end; definition.minimumDamageFraction = floor;
            definition.headshotMultiplier = weak; definition.recoilDegrees = recoil; definition.aimFieldOfView = aim;
            definition.pelletCount = pellets; definition.spreadDegrees = spread;
            definition.tracerColor = id == 3 ? new Color(1,.6f,.2f) : id == 4 ? new Color(1,.8f,.4f) : id == 5 ? new Color(.8f,.4f,1) : new Color(.4f,1,.8f);
            entries.Add(definition);
        }
        public static void ClearCache() => entries.Clear();
    }
    public static class WeaponPattern
    {
        public static Vector3 Direction(Vector3 forward, ulong attackId, int pellet, int count, float degrees)
        {
            if (count <= 1 && degrees <= 0) return forward.normalized;
            uint bits = unchecked((uint)(attackId * 747796405UL + (ulong)pellet * 2891336453UL));
            float phase = (bits % 10000) * .0001f * Mathf.PI * 2;
            float radius = count > 1 ? Mathf.Sqrt((pellet + .5f)/count) : .5f;
            var right = Vector3.Cross(Vector3.up,forward).normalized; if (right.sqrMagnitude < .1f) right = Vector3.right;
            var up = Vector3.Cross(forward,right).normalized;
            return (forward + (right*Mathf.Cos(phase)+up*Mathf.Sin(phase))*Mathf.Tan(degrees*Mathf.Deg2Rad)*radius).normalized;
        }
        public static float Falloff(float distance,float start,float end,float floor)
            => Mathf.Lerp(1,Mathf.Clamp(floor,.01f,1),Mathf.InverseLerp(start,Mathf.Max(start+.01f,end),distance));
    }
}