using Cryville.Common;
using Cryville.Common.Collections.Specialized;
using Cryville.Common.Pdt;
using System;
using System.Reflection;
using RBeatTime = Cryville.Crtr.BeatTime;
using RClip = Cryville.Crtr.Clip;
using RColor = UnityEngine.Color;
using RTargetString = Cryville.Common.Buffers.TargetString;
using RVector2 = UnityEngine.Vector2;
using RVector3 = UnityEngine.Vector3;
using RVector4 = UnityEngine.Vector4;

namespace Cryville.Crtr {
	public abstract class PropOp : PdtOperator {
		protected PropOp() : base(1) { }
		protected PropOp(int pc) : base(pc) { }
		public class Arbitrary : PropOp {
			public int Name { get; set; }
			protected override void Execute() {
				var op = GetOperand(0);
				var value = new byte[op.Length];
				op.CopyTo(value, 0);
				PdtEvaluator.Instance.ContextCascadeUpdate(Name, new PropSrc.Arbitrary(op.Type, value));
			}
		}
		public abstract class Fixed<T> : PropOp {
			protected readonly Action<T> _cb;
			public Fixed(Action<T> cb) { _cb = cb; }
			public Fixed(int pc, Action<T> cb) : base(pc) { _cb = cb; }
		}
		public class Boolean : Fixed<bool> {
			public Boolean(Action<bool> cb) : base(cb) { }
			protected override void Execute() {
				_cb(GetOperand(0).AsNumber() > 0);
			}
		}
		public class Clip : Fixed<RClip> {
			public Clip(Action<RClip> cb) : base(2, cb) { }
			protected override void Execute() {
				if (LoadedOperandCount < 2)
					throw new ArgumentException("Invalid clip syntax");
				_cb(new RClip(GetOperand(0).AsNumber(), GetOperand(1).AsNumber()));
			}
		}
		public class Integer : Fixed<int> {
			public Integer(Action<int> cb) : base(cb) { }
			protected override void Execute() {
				_cb((int)GetOperand(0).AsNumber());
			}
		}
		public class Float : Fixed<float> {
			public Float(Action<float> cb) : base(cb) { }
			protected override void Execute() {
				_cb(GetOperand(0).AsNumber());
			}
		}
		public class String : Fixed<string> {
			public String(Action<string> cb) : base(cb) { }
			protected override void Execute() {
				_cb(GetOperand(0).AsString());
			}
		}
		public class StringArray : Fixed<string[]> {
			public StringArray(Action<string[]> cb) : base(cb) { }
			protected override unsafe void Execute() {
				var op = GetOperand(0);
				op.GetArraySuffix(out int arrtype, out int len);
				if (arrtype != PdtInternalType.String) throw new InvalidCastException("Not an array of strings");
				var result = new string[len];
				int o = 0;
				for (int i = 0; i < len; i++) {
					string v = op.AsString(o);
					o += v.Length * sizeof(char) + sizeof(int);
					result[i] = v;
				}
				_cb(result);
			}
		}
		public class TargetString : PropOp {
			readonly Func<RTargetString> _cb;
			public TargetString(Func<RTargetString> cb) { _cb = cb; }
			protected override void Execute() {
				var target = _cb();
				var op = GetOperand(0);
				if (op.Type != PdtInternalType.String) throw new ArgumentException("Not a string");
				int len = op.As<int>();
				target.Length = len;
				for (int i = 0; i < len; i++)
					target[i] = op.As<char>(sizeof(int) + i * sizeof(char));
				target.Validate();
			}
		}
		public class Identifier : Fixed<int> {
			public Identifier(Action<int> cb) : base(cb) { }
			protected override void Execute() {
				_cb(GetOperand(0).AsIdentifier());
			}
		}
		public class Enum : Fixed<object> {
			readonly Type _type;
			readonly IntKeyedDictionary<int> _cache = new();
			public Enum(Type type, Action<object> cb) : base(cb) {
				if (!type.IsEnum)
					throw new ArgumentException("Type is not enum");
				_type = type;
				var names = type.GetFields(BindingFlags.Public | BindingFlags.Static);
				for (int i = 0; i < names.Length; i++)
					_cache[IdentifierManager.Shared.Request(names[i].Name)] = Convert.ToInt32(names[i].GetValue(null));
			}
			protected override void Execute() {
				int result = 0;
				for (int i = 0; i < LoadedOperandCount; i++)
					result |= _cache[GetOperand(i).AsIdentifier()];
				_cb(System.Enum.ToObject(_type, result));
			}
		}
		public class Enum<T> : Fixed<T> {
			static readonly IntKeyedDictionary<int> _cache = new();
			readonly Func<int, T> _caster;
			static Enum() {
				if (!typeof(T).IsEnum)
					throw new ArgumentException("Type is not enum");
				var names = typeof(T).GetFields(BindingFlags.Public | BindingFlags.Static);
				for (int i = 0; i < names.Length; i++)
					_cache[IdentifierManager.Shared.Request(names[i].Name)] = Convert.ToInt32(names[i].GetValue(null));
			}
			public Enum(Action<T> cb, Func<int, T> caster) : base(cb) {
				_caster = caster;
			}
			protected override void Execute() {
				int result = 0;
				for (int i = 0; i < LoadedOperandCount; i++)
					result |= _cache[GetOperand(i).AsIdentifier()];
				_cb(_caster(result));
			}
		}
		public class BeatTime : Fixed<RBeatTime> {
			public BeatTime(Action<RBeatTime> cb) : base(cb) { }
			protected override unsafe void Execute() {
				var o = GetOperand(0);
				_cb(o.As<RBeatTime>());
			}
		}
		public class Vector2 : Fixed<RVector2> {
			public Vector2(Action<RVector2> cb) : base(cb) { }
			protected override unsafe void Execute() {
				var o = GetOperand(0);
				switch ((o.Length - 4) / 4) {
					case 0: // Number
					case 1: // Array[1]
						float num = o.AsNumber();
						_cb(new RVector2(num, num));
						break;
					case 2:
						_cb(o.As<RVector2>());
						break;
					default:
						throw new InvalidOperationException("Invalid array size");
				}
			}
		}
		public class Vector3 : Fixed<RVector3> {
			public Vector3(Action<RVector3> cb) : base(cb) { }
			protected override unsafe void Execute() {
				var o = GetOperand(0);
				switch ((o.Length - 4) / 4) {
					case 0: // Number
					case 1: // Array[1]
						float num = o.AsNumber();
						_cb(new RVector3(num, num));
						break;
					case 2: _cb(o.As<RVector2>()); break;
					case 3: _cb(o.As<RVector3>()); break;
					default: throw new InvalidOperationException("Invalid array size");
				}
			}
		}
		public class Vector4 : Fixed<RVector4> {
			public Vector4(Action<RVector4> cb) : base(cb) { }
			protected override unsafe void Execute() {
				var o = GetOperand(0);
				switch ((o.Length - 4) / 4) {
					case 0: // Number
					case 1: // Array[1]
						float num = o.AsNumber();
						_cb(new RVector4(num, num, num, num));
						break;
					case 2: _cb(o.As<RVector2>()); break;
					case 3: _cb(o.As<RVector3>()); break;
					case 4: _cb(o.As<RVector4>()); break;
					default: throw new InvalidOperationException("Invalid array size");
				}
			}
		}
		public class Color : Fixed<RColor> {
			public Color(Action<RColor> cb) : base(cb) { }
			protected override unsafe void Execute() {
				var o = GetOperand(0);
				switch ((o.Length - 4) / 4) {
					case 3:
						_cb(new RColor(o.As<float>(), o.As<float>(sizeof(float)), o.As<float>(2 * sizeof(float))));
						break;
					case 4:
						_cb(o.As<RColor>());
						break;
					default:
						throw new InvalidOperationException("Invalid array size");
				}
			}
		}
	}
}