using Cryville.Common;
using Cryville.Common.Collections.Specialized;
using Cryville.Common.Math;
using Cryville.Common.Pdt;
using Cryville.Crtr.Config;
using Cryville.Crtr.Event;
using Cryville.Crtr.Ruleset;
using Cryville.Crtr.Skin;
using System;
using System.Collections.Generic;
using System.Globalization;
using UnityEngine;

namespace Cryville.Crtr {
	public class PdtEvaluator : PdtEvaluatorBase {
		static PdtEvaluator m_instance;
		public static PdtEvaluator Instance {
			get {
				m_instance ??= new PdtEvaluator();
				return m_instance;
			}
		}

		readonly Dictionary<PdtOperatorSignature, PdtOperator> _shortops = new();
		readonly IntKeyedDictionary<PdtOperator> _ctxops = new();

		static readonly byte[] _nullbuf = new byte[0];
		readonly byte[] _numbuf = new byte[4];
		readonly PropSrc _vecsrc;
		Vector _vec;
		static readonly int _var_w = IdentifierManager.Shared.Request("w");
		static readonly int _var_h = IdentifierManager.Shared.Request("h");
		static readonly int _var_inf = IdentifierManager.Shared.Request("inf");
		static readonly int _var_true = IdentifierManager.Shared.Request("true");
		static readonly int _var_false = IdentifierManager.Shared.Request("false");
		static readonly int _var_null = IdentifierManager.Shared.Request("null");
		static readonly int _var_current_time = IdentifierManager.Shared.Request("current_time");
		protected override void GetVariable(int name, bool forced, out int type, out byte[] value) {
			if (name == _var_w) { LoadNum(ChartPlayer.hitRect.width); type = PdtInternalType.Number; value = _numbuf; }
			else if (name == _var_h) { LoadNum(ChartPlayer.hitRect.height); type = PdtInternalType.Number; value = _numbuf; }
			else if (name == _var_inf) { LoadNum(float.PositiveInfinity); type = PdtInternalType.Number; value = _numbuf; }
			else if (name == _var_true) { LoadNum(1); type = PdtInternalType.Number; value = _numbuf; }
			else if (name == _var_false) { LoadNum(0); type = PdtInternalType.Number; value = _numbuf; }
			else if (name == _var_null) { LoadIdent(0); type = PdtInternalType.Undefined; value = _numbuf; }
			else {
				if (ContextEvent != null && ContextEvent.PropSrcs.TryGetValue(name, out PropSrc prop)) {
					prop.Get(out type, out value);
				}
				else if (ContextState != null && ChartPlayer.motionRegistry.ContainsKey(new Identifier(name))) {
					_vec = ContextState.GetComputedValue(name);
					_vecsrc.Invalidate();
					_vecsrc.Get(out type, out value);
					RevokePotentialConstant();
				}
				else if (ContextState != null && ContextState.Handler.PropSrcs.TryGetValue(name, out prop)) {
					prop.Get(out type, out value);
					RevokePotentialConstant();
				}
				else if (ContextSkinContainer != null && ContextSkinContainer.Variables.TryGetValue(name, out PropStores.Float variable)) {
					variable.Source.Get(out type, out value);
				}
				else if (ContextRulesetConfig != null && ContextRulesetConfig.TryGetMappedSource(name, out prop)) {
					prop.Get(out type, out value);
				}
				else if (ContextJudge != null && ContextJudge.TryGetScoreSrc(name, out prop)) {
					prop.Get(out type, out value);
					RevokePotentialConstant();
				}
				else {
					PropSrc result = ContextCascadeLookup(name);
					if (result != null) {
						result.Get(out type, out value);
					}
					else if (forced) {
						type = PdtInternalType.Error;
						value = _nullbuf;
					}
					else {
						type = PdtInternalType.Undefined;
						LoadIdent(name);
						value = _numbuf;
					}
				}
			}
		}
		unsafe void LoadIdent(int value) {
			fixed (byte* ptr = _numbuf) *(int*)ptr = value;
		}
		unsafe void LoadNum(float value) {
			fixed (byte* ptr = _numbuf) *(float*)ptr = value;
		}
		static readonly int _op_sep = IdentifierManager.Shared.Request(",");
		static readonly int _func_int_map = IdentifierManager.Shared.Request("int_map");
		static readonly int _func_map = IdentifierManager.Shared.Request("map");
		protected override PdtOperator GetOperator(PdtOperatorSignature sig) {
			if (_shortops.TryGetValue(sig, out PdtOperator result)) {
				return result;
			}
			else if (_ctxops.TryGetValue(sig.Name, out result)) {
				return result;
			}
			else if (sig.Name == _op_sep) {
				result = new op_arr(sig.ParamCount);
				_shortops.Add(new PdtOperatorSignature(_op_sep, sig.ParamCount), result);
				return result;
			}
			else if (sig.Name == _func_int_map) {
				result = new func_int_map(sig.ParamCount);
				_shortops.Add(new PdtOperatorSignature(_func_int_map, sig.ParamCount), result);
				return result;
			}
			else if (sig.Name == _func_map) {
				result = new func_map(sig.ParamCount);
				_shortops.Add(new PdtOperatorSignature(_func_map, sig.ParamCount), result);
				return result;
			}
			else throw new KeyNotFoundException(string.Format("Undefined operator {0}", sig));
		}

		static readonly int _colop_and = IdentifierManager.Shared.Request("&");
		static readonly int _colop_or = IdentifierManager.Shared.Request("|");
		protected override bool Collapse(int name, PdtVariableMemory param) {
			if (name == _colop_and) return (param.Type == PdtInternalType.Number || param.Type == PdtInternalType.Vector) && param.AsNumber() <= 0;
			else if (name == _colop_or) return (param.Type != PdtInternalType.Number && param.Type != PdtInternalType.Vector) || param.AsNumber() > 0;
			else throw new KeyNotFoundException(string.Format("Undefined collapse operator {0}", IdentifierManager.Shared.Retrieve(name)));
		}

		public ChartEvent ContextEvent { get; set; }
		public ContainerState ContextState { get; set; }
		public SkinContainer ContextSkinContainer { get; set; }
		public Transform ContextTransform { get; set; }
		public RulesetConfigStore ContextRulesetConfig { get; set; }
		public Judge ContextJudge { get; set; }
		public PropSrc ContextSelfValue { get; set; }

		readonly Stack<int> ContextCascadeBlocks = new();
		public void ContextCascadeInsertBlock() {
			ContextCascadeBlocks.Push(_cascadeHeight);
		}
		public void ContextCascadeDiscardBlock() {
			ContextCascadeBlocks.Pop();
		}
		readonly IntKeyedDictionary<PropSrc>[] ContextCascade = new IntKeyedDictionary<PropSrc>[256];
		int _cascadeHeight;
		public void ContextCascadeInsert() {
			_cascadeHeight++;
		}
		public void ContextCascadeInsert(IntKeyedDictionary<PropSrc> srcs) {
			ContextCascadeInsert();
			foreach (var src in srcs) ContextCascadeUpdate(src.Key, src.Value);
		}
		public void ContextCascadeUpdate(int key, PropSrc value) {
			ContextCascade[_cascadeHeight - 1][key] = value;
		}
		public PropSrc ContextCascadeLookup(int name) {
			for (int i = _cascadeHeight - 1; i >= ContextCascadeBlocks.Peek(); i--) {
				var cas = ContextCascade[i];
				if (cas.TryGetValue(name, out PropSrc result)) {
					return result;
				}
			}
			return null;
		}
		public void ContextCascadeDiscard() {
			ContextCascade[--_cascadeHeight].Clear();
		}

		public void Reset() {
			_cascadeHeight = 0;
			ContextCascadeBlocks.Clear();
			ContextCascadeBlocks.Push(0);
			ContextEvent = null;
			ContextJudge = null;
			ContextRulesetConfig = null;
			ContextSelfValue = null;
			ContextSkinContainer = null;
			ContextState = null;
			ContextTransform = null;
		}

		public PdtEvaluator() {
			ContextCascadeBlocks.Push(0);
			for (int i = 0; i < ContextCascade.Length; i++) ContextCascade[i] = new IntKeyedDictionary<PropSrc>();
			_vecsrc = new VectorSrc(() => _vec);

			_shortops.Add(new PdtOperatorSignature("@", 2), new op_at_2());

			_shortops.Add(new PdtOperatorSignature("*", 2), new op_mul_2());
			_shortops.Add(new PdtOperatorSignature("/", 2), new op_div_2());
			_shortops.Add(new PdtOperatorSignature("%", 2), new op_mod_2());

			_shortops.Add(new PdtOperatorSignature("+", 1), new op_add_1());
			_shortops.Add(new PdtOperatorSignature("+", 2), new op_add_2());
			_shortops.Add(new PdtOperatorSignature("-", 1), new op_sub_1());
			_shortops.Add(new PdtOperatorSignature("-", 2), new op_sub_2());

			_shortops.Add(new PdtOperatorSignature("=", 2), new op_eq_2());
			_shortops.Add(new PdtOperatorSignature("<", 2), new op_lt_2());
			_shortops.Add(new PdtOperatorSignature(">", 2), new op_gt_2());

			_shortops.Add(new PdtOperatorSignature("!", 1), new op_not_1());

			_shortops.Add(new PdtOperatorSignature("frame_seq", 3), new func_frame_seq());
			_shortops.Add(new PdtOperatorSignature("is", 2), new func_is());
			_shortops.Add(new PdtOperatorSignature("is_in", 1), new func_is_in());

			_ctxops.Add(IdentifierManager.Shared.Request("screen_edge"), new func_screen_edge(() => ContextTransform));
			_ctxops.Add(IdentifierManager.Shared.Request("int"), new func_int(() => ContextSelfValue));
			_ctxops.Add(IdentifierManager.Shared.Request("clamp"), new func_clamp(() => ContextSelfValue));
			_ctxops.Add(IdentifierManager.Shared.Request("min"), new func_min(() => ContextSelfValue));
			_ctxops.Add(IdentifierManager.Shared.Request("max"), new func_max(() => ContextSelfValue));
			_ctxops.Add(IdentifierManager.Shared.Request("abs"), new func_abs(() => ContextSelfValue));
			_ctxops.Add(IdentifierManager.Shared.Request("anim"), new func_anim(() => ContextSelfValue));
			_ctxops.Add(IdentifierManager.Shared.Request("cubic_bezier"), new func_cubic_bezier(() => ContextSelfValue));
			_ctxops.Add(IdentifierManager.Shared.Request("ease"), new func_cubic_bezier_fixed(0.25f, 0.1f, 0.25f, 1f, () => ContextSelfValue));
			_ctxops.Add(IdentifierManager.Shared.Request("ease_in"), new func_cubic_bezier_fixed(0.42f, 0f, 1f, 1f, () => ContextSelfValue));
			_ctxops.Add(IdentifierManager.Shared.Request("ease_out"), new func_cubic_bezier_fixed(0f, 0f, 0.58f, 1f, () => ContextSelfValue));
			_ctxops.Add(IdentifierManager.Shared.Request("ease_in_out"), new func_cubic_bezier_fixed(0.42f, 0f, 0.58f, 1f, () => ContextSelfValue));

			_ctxops.Add(IdentifierManager.Shared.Request("precision"), new func_precision(() => ContextSelfValue));

			_ctxops.Add(IdentifierManager.Shared.Request("interval"), new func_interval(() => ContextSelfValue));
			_ctxops.Add(IdentifierManager.Shared.Request("circle"), new func_sphere(() => ContextSelfValue));
			_ctxops.Add(IdentifierManager.Shared.Request("sphere"), new func_sphere(() => ContextSelfValue));

			PropSrc cccb(int k) => ContextCascadeLookup(k);
			_ctxops.Add(IdentifierManager.Shared.Request("attack_timing"), new func_attack_timing(cccb));
			_ctxops.Add(IdentifierManager.Shared.Request("release_timing"), new func_release_timing(cccb));
			_ctxops.Add(IdentifierManager.Shared.Request("enter_timing"), new func_enter_timing(cccb));
			_ctxops.Add(IdentifierManager.Shared.Request("leave_timing"), new func_leave_timing(cccb));

			PdtExpression jacb(int k) => ContextJudge._areaFuncs[new Identifier(k)];
			_ctxops.Add(IdentifierManager.Shared.Request("attack_timed_area"), new func_attack_timed_area(cccb, jacb, this));
			_ctxops.Add(IdentifierManager.Shared.Request("release_timed_area"), new func_release_timed_area(cccb, jacb, this));
			_ctxops.Add(IdentifierManager.Shared.Request("enter_timed_area"), new func_enter_or_leave_timed_area(cccb, jacb, this, true));
			_ctxops.Add(IdentifierManager.Shared.Request("leave_timed_area"), new func_enter_or_leave_timed_area(cccb, jacb, this, false));
			_ctxops.Add(IdentifierManager.Shared.Request("enter_timing_area"), new func_enter_or_leave_timing_area(cccb, jacb, this, true));
			_ctxops.Add(IdentifierManager.Shared.Request("leave_timing_area"), new func_enter_or_leave_timing_area(cccb, jacb, this, false));

			_ctxops.Add(IdentifierManager.Shared.Request("in_timing"), new func_in_timing(cccb));
			_ctxops.Add(IdentifierManager.Shared.Request("in_area"), new func_in_area(cccb, jacb, this));
		}
		#region Operators
#pragma warning disable IDE1006
		#region Basic Operators
		class op_add_1 : PdtOperator {
			public op_add_1() : base(1) { }
			protected override void Execute() {
				float result = GetOperand(0).AsNumber();
				GetReturnFrame(PdtInternalType.Number, sizeof(float)).SetNumber(result);
			}
		}
		class op_add_2 : PdtOperator {
			public op_add_2() : base(2) { }
			protected override void Execute() {
				float result = GetOperand(0).AsNumber() + GetOperand(1).AsNumber();
				GetReturnFrame(PdtInternalType.Number, sizeof(float)).SetNumber(result);
			}
		}
		class op_sub_1 : PdtOperator {
			public op_sub_1() : base(1) { }
			protected override void Execute() {
				float result = -GetOperand(0).AsNumber();
				GetReturnFrame(PdtInternalType.Number, sizeof(float)).SetNumber(result);
			}
		}
		class op_sub_2 : PdtOperator {
			public op_sub_2() : base(2) { }
			protected override void Execute() {
				float result = GetOperand(0).AsNumber() - GetOperand(1).AsNumber();
				GetReturnFrame(PdtInternalType.Number, sizeof(float)).SetNumber(result);
			}
		}
		class op_mul_2 : PdtOperator {
			public op_mul_2() : base(2) { }
			protected override void Execute() {
				float result = GetOperand(0).AsNumber() * GetOperand(1).AsNumber();
				GetReturnFrame(PdtInternalType.Number, sizeof(float)).SetNumber(result);
			}
		}
		class op_div_2 : PdtOperator {
			public op_div_2() : base(2) { }
			protected override void Execute() {
				float result = GetOperand(0).AsNumber() / GetOperand(1).AsNumber();
				GetReturnFrame(PdtInternalType.Number, sizeof(float)).SetNumber(result);
			}
		}
		class op_mod_2 : PdtOperator {
			public op_mod_2() : base(2) { }
			protected override void Execute() {
				float result = GetOperand(0).AsNumber() % GetOperand(1).AsNumber();
				GetReturnFrame(PdtInternalType.Number, sizeof(float)).SetNumber(result);
			}
		}
		class op_eq_2 : PdtOperator {
			public op_eq_2() : base(2) { }
			protected override void Execute() {
				float result = GetOperand(0).AsNumber() == GetOperand(1).AsNumber() ? 1 : 0;
				GetReturnFrame(PdtInternalType.Number, sizeof(float)).SetNumber(result);
			}
		}
		class op_lt_2 : PdtOperator {
			public op_lt_2() : base(2) { }
			protected override void Execute() {
				float result = GetOperand(0).AsNumber() < GetOperand(1).AsNumber() ? 1 : 0;
				GetReturnFrame(PdtInternalType.Number, sizeof(float)).SetNumber(result);
			}
		}
		class op_gt_2 : PdtOperator {
			public op_gt_2() : base(2) { }
			protected override void Execute() {
				float result = GetOperand(0).AsNumber() > GetOperand(1).AsNumber() ? 1 : 0;
				GetReturnFrame(PdtInternalType.Number, sizeof(float)).SetNumber(result);
			}
		}
		class op_not_1 : PdtOperator {
			public op_not_1() : base(1) { }
			protected override void Execute() {
				float result = GetOperand(0).AsNumber() <= 0 ? 1 : 0;
				GetReturnFrame(PdtInternalType.Number, sizeof(float)).SetNumber(result);
			}
		}
		class op_arr : PdtOperator {
			public op_arr(int pc) : base(pc) { }
			protected override void Execute() {
				var o0 = GetOperand(0);
				int type = o0.Type;
				int len = o0.Length;
				bool blit = !IsBlittable(type);
				for (var i = 1; i < LoadedOperandCount; i++) {
					var o = GetOperand(i);
					if (o.Type != type) throw new InvalidOperationException("Cannot create variant type array");
					else if (!IsBlittable(o.Type)) blit = true;
					len += o.Length;
				}
				if (blit) GetReturnFrame(PdtInternalType.Array, len + 2 * sizeof(int)).SetArraySuffix(type, LoadedOperandCount);
				else GetReturnFrame(PdtInternalType.Vector, len + sizeof(int)).SetArraySuffix(type);
			}
			static bool IsBlittable(int type) {
				return type == PdtInternalType.Number;
			}
		}
		class op_at_2 : PdtOperator {
			public op_at_2() : base(2) { }
			protected override void Execute() {
				int _;
				var op0 = GetOperand(0);
				var op1 = (int)Math.Round(GetOperand(1).AsNumber());
				if (op0.Type == PdtInternalType.Vector) {
					op0.GetArraySuffix(out _, out _);
					if (op1 >= (op0.Length - sizeof(int)) / sizeof(float)) throw new IndexOutOfRangeException();
					GetReturnFrame(PdtInternalType.Number, sizeof(float)).SetNumber(op0.AsNumber(op1 * sizeof(float)));
				}
				else if (op0.Type == PdtInternalType.Number) {
					if (op1 != 0) throw new IndexOutOfRangeException();
					GetReturnFrame(PdtInternalType.Number, sizeof(float)).SetNumber(op0.AsNumber());
				}
				else throw new InvalidOperationException("Not a vector or number");
			}
		}
		#endregion
		#region Basic Functions
		class func_frame_seq : PdtOperator {
			public func_frame_seq() : base(3) { }
			protected override unsafe void Execute() {
				string pf = GetOperand(0).AsString();
				int f = (int)GetOperand(1).AsNumber();
				int t = (int)GetOperand(2).AsNumber();
				int pfl = pf.Length;
				int fc = t - f + 1;
				if (fc <= 0) throw new ArgumentException("Start index is greater than end index");
				int l = (f == 0 ? 1 : 0) + pfl * fc;
				for (int p = 1, i = 1; p < 4; p++, i *= 10) {
					int j = i * 10 - 1;
					if (f <= j && t >= i) {
						int m = Math.Max(f, i);
						int n = Math.Min(t, j);
						l += (n - m + 1) * i;
					}
				}
				l *= sizeof(char);
				l += sizeof(int) * (fc + 2);
				var ret = GetReturnFrame(PdtInternalType.Array, l);
				ret.SetArraySuffix(PdtInternalType.String, fc);
				int o = 0;
				for (int i = f; i <= t; i++) {
					var s = pf + i.ToString(CultureInfo.InvariantCulture);
					ret.SetString(s, o);
					o += sizeof(int) + s.Length * sizeof(char);
				}
			}
		}
		class func_int_map : PdtOperator {
			public func_int_map(int pc) : base(pc) {
				if (pc < 4) throw new ArgumentOutOfRangeException("Too few parameters for int_map");
			}
			protected override unsafe void Execute() {
				var value = GetOperand(0).AsNumber();
				var offset = GetOperand(1).AsNumber();
				var step = GetOperand(2).AsNumber();
				var index = (int)((value - offset) / step);
				if (index < 0 || index >= LoadedOperandCount - 3) index = 0;
				var hit = GetOperand(index + 3);
				var ret = GetReturnFrame(hit.Type, hit.Length);
				hit.CopyTo(ret);
			}
		}
		class func_is : PdtOperator {
			public func_is() : base(2) { }
			protected override unsafe void Execute() {
				GetReturnFrame(PdtInternalType.Number, sizeof(float))
					.SetNumber(GetOperand(0).Equals(GetOperand(1)) ? 1 : 0);
			}
		}
		class func_is_in : PdtOperator {
			public func_is_in() : base(1) { }
			protected override unsafe void Execute() {
				var arg = GetOperand(0);
				if (arg.Type == PdtInternalType.Number && arg.AsNumber() <= 0) {
					GetReturnFrame(PdtInternalType.Null, 0);
				}
				else {
					var ret = GetReturnFrame(arg.Type, arg.Length);
					arg.CopyTo(ret);
				}
			}
		}
		class func_map : PdtOperator {
			public func_map(int pc) : base(pc) {
				if (pc < 2) throw new ArgumentOutOfRangeException("Too few parameters for map");
			}
			protected override unsafe void Execute() {
				var value = GetOperand(0).AsNumber();
				var index = (int)value;
				if (index < 0 || index >= LoadedOperandCount - 1) index = 0;
				var hit = GetOperand(index + 1);
				var ret = GetReturnFrame(hit.Type, hit.Length);
				hit.CopyTo(ret);
			}
		}
		#endregion
		#region Contextual Functions
		class func_screen_edge : PdtOperator {
			readonly Func<Transform> _ctxcb;
			public func_screen_edge(Func<Transform> ctxcb) : base(1) {
				_ctxcb = ctxcb;
			}
			protected override unsafe void Execute() {
				var ctx = _ctxcb();
				var ray = new Ray(ctx.position, ctx.rotation * Vector3.forward);
				ChartPlayer.frustumPlanes[(int)GetOperand(0).AsNumber()].Raycast(ray, out float dist);
				var ret = GetReturnFrame(PdtInternalType.Vector, sizeof(Vector3) + sizeof(int));
				ret.Set(ray.GetPoint(dist));
				ret.SetArraySuffix(PdtInternalType.Number);
			}
		}
		class func_int : PdtOperator {
			readonly Func<PropSrc> _ctxcb;
			public func_int(Func<PropSrc> ctxcb) : base(1) {
				_ctxcb = ctxcb;
			}
			protected override unsafe void Execute() {
				var ret = GetReturnFrame(PdtInternalType.Number, sizeof(float));
				var v = LoadedOperandCount switch {
					0 => oputil.AsNumber(_ctxcb()),
					1 => GetOperand(0).AsNumber(),
					_ => throw new ArgumentException("Argument count not 0 or 1"),
				};
				ret.SetNumber(Mathf.Floor(v));
			}
		}
		class func_clamp : PdtOperator {
			readonly Func<PropSrc> _ctxcb;
			public func_clamp(Func<PropSrc> ctxcb) : base(3) {
				_ctxcb = ctxcb;
			}
			protected override unsafe void Execute() {
				float min, value, max;
				switch (LoadedOperandCount) {
					case 2:
						value = oputil.AsNumber(_ctxcb());
						min = GetOperand(0).AsNumber();
						max = GetOperand(1).AsNumber();
						break;
					case 3:
						value = GetOperand(0).AsNumber();
						min = GetOperand(1).AsNumber();
						max = GetOperand(2).AsNumber();
						break;
					default: throw new ArgumentException("Argument count not 2 or 3");
				}
				var ret = GetReturnFrame(PdtInternalType.Number, sizeof(float));
				ret.SetNumber(Mathf.Clamp(value, min, max));
			}
		}
		class func_min : PdtOperator {
			readonly Func<PropSrc> _ctxcb;
			public func_min(Func<PropSrc> ctxcb) : base(2) {
				_ctxcb = ctxcb;
			}
			protected override unsafe void Execute() {
				var ret = GetReturnFrame(PdtInternalType.Number, sizeof(float));
				float a = GetOperand(0).AsNumber();
				var b = LoadedOperandCount switch {
					1 => oputil.AsNumber(_ctxcb()),
					2 => GetOperand(1).AsNumber(),
					_ => throw new ArgumentException("Argument count not 2 or 3"),
				};
				ret.SetNumber(Mathf.Min(a, b));
			}
		}
		class func_max : PdtOperator {
			readonly Func<PropSrc> _ctxcb;
			public func_max(Func<PropSrc> ctxcb) : base(2) {
				_ctxcb = ctxcb;
			}
			protected override unsafe void Execute() {
				var ret = GetReturnFrame(PdtInternalType.Number, sizeof(float));
				var a = GetOperand(0).AsNumber();
				var b = LoadedOperandCount switch {
					1 => oputil.AsNumber(_ctxcb()),
					2 => GetOperand(1).AsNumber(),
					_ => throw new ArgumentException("Argument count not 2 or 3"),
				};
				ret.SetNumber(Mathf.Max(a, b));
			}
		}
		class func_abs : PdtOperator {
			readonly Func<PropSrc> _ctxcb;
			public func_abs(Func<PropSrc> ctxcb) : base(1) {
				_ctxcb = ctxcb;
			}
			protected override unsafe void Execute() {
				var ret = GetReturnFrame(PdtInternalType.Number, sizeof(float));
				var arg = LoadedOperandCount switch {
					0 => oputil.AsNumber(_ctxcb()),
					1 => GetOperand(0).AsNumber(),
					_ => throw new ArgumentException("Argument count not 0 or 1"),
				};
				ret.SetNumber(Mathf.Abs(arg));
			}
		}
		class func_anim : PdtOperator {
			readonly Func<PropSrc> _ctxcb;
			public func_anim(Func<PropSrc> ctxcb) : base(3) {
				_ctxcb = ctxcb;
			}
			protected override unsafe void Execute() {
				var op1 = GetOperand(0);
				var op2 = GetOperand(1);
				var dim1 = GetDimension(op1);
				var dim2 = GetDimension(op2);
				var dim0 = Math.Min(dim1, dim2);
				Vector4 trans;
				switch (LoadedOperandCount) {
					case 2:
						var num = oputil.AsNumber(_ctxcb());
						trans = new Vector4(num, num, num, num);
						break;
					case 3: trans = GetTransition(GetOperand(2)); break;
					default: throw new ArgumentException("Argument count not 2 or 3");
				}
				if (dim0 == 1) {
					GetReturnFrame(PdtInternalType.Number, sizeof(float))
						.SetNumber(op1.AsNumber() * (1 - trans.x) + op2.AsNumber() * trans.x);
				}
				else {
					var ret = GetReturnFrame(PdtInternalType.Vector, dim0 * sizeof(float) + sizeof(int));
					for (int i = 0; i < dim0 * sizeof(float); i += sizeof(float)) {
						ret.SetNumber(op1.AsNumber(i) * (1 - trans[i]) + op2.AsNumber(i) * trans[i], i);
					}
					ret.SetArraySuffix(PdtInternalType.Number);
				}
			}
			static int GetDimension(PdtVariableMemory op) {
				switch (op.Type) {
					case PdtInternalType.Number: return 1;
					case PdtInternalType.Vector:
						int arrtype, _;
						op.GetArraySuffix(out arrtype, out _);
						if (arrtype != PdtInternalType.Number)
							throw new ArgumentException("Not animatable");
						return (op.Length - sizeof(int)) / sizeof(float);
					default: throw new ArgumentException("Not animatable");
				}
			}
			static Vector4 GetTransition(PdtVariableMemory op) {
				switch (op.Type) {
					case PdtInternalType.Number:
						var num = op.AsNumber();
						return new Vector4(num, num, num, num);
					case PdtInternalType.Vector:
						int arrtype, _;
						op.GetArraySuffix(out arrtype, out _);
						if (arrtype != PdtInternalType.Number)
							throw new ArgumentException("Not animatable");
						switch ((op.Length - sizeof(int)) / sizeof(float)) {
							case 0: throw new ArgumentException("Empty vector");
							case 1:
								num = op.AsNumber();
								return new Vector4(num, num, num, num);
							case 2: return new Vector4(op.AsNumber(), op.AsNumber(sizeof(float)), 0, 0);
							case 3: return new Vector4(op.AsNumber(), op.AsNumber(sizeof(float)), op.AsNumber(2 * sizeof(float)), 0);
							default: return new Vector4(op.AsNumber(), op.AsNumber(sizeof(float)), op.AsNumber(2 * sizeof(float)), op.AsNumber(3 * sizeof(float)));
						}
					default: throw new ArgumentException("Not animatable");
				}
			}
		}
		class func_cubic_bezier : PdtOperator {
			readonly Func<PropSrc> _ctxcb;
			public func_cubic_bezier(Func<PropSrc> ctxcb) : base(5) {
				_ctxcb = ctxcb;
			}
			protected override unsafe void Execute() {
				float x1 = GetOperand(0).AsNumber(), y1 = GetOperand(1).AsNumber();
				float x2 = GetOperand(2).AsNumber(), y2 = GetOperand(3).AsNumber();
				var time = LoadedOperandCount switch {
					4 => oputil.AsNumber(_ctxcb()),
					5 => GetOperand(4).AsNumber(),
					_ => throw new ArgumentException("Argument count not 4 or 5"),
				};
				GetReturnFrame(PdtInternalType.Number, sizeof(float))
					.SetNumber(CubicBezier.Evaluate(time, x1, y1, x2, y2, 1e-3f));
			}
		}
		class func_cubic_bezier_fixed : PdtOperator {
			readonly float x1, y1, x2, y2;
			readonly Func<PropSrc> _ctxcb;
			public func_cubic_bezier_fixed(float x1, float y1, float x2, float y2, Func<PropSrc> ctxcb) : base(1) {
				this.x1 = x1; this.y1 = y1;
				this.x2 = x2; this.y2 = y2;
				_ctxcb = ctxcb;
			}
			protected override void Execute() {
				var time = LoadedOperandCount switch {
					0 => oputil.AsNumber(_ctxcb()),
					1 => GetOperand(0).AsNumber(),
					_ => throw new ArgumentException("Argument count not 0 or 1"),
				};
				GetReturnFrame(PdtInternalType.Number, sizeof(float))
					.SetNumber(CubicBezier.Evaluate(time, x1, y1, x2, y2, 1e-3f));
			}
		}
		class func_precision : PdtOperator {
			readonly Func<PropSrc> _ctxcb;
			public func_precision(Func<PropSrc> ctxcb) : base(2) {
				_ctxcb = ctxcb;
			}
			protected override unsafe void Execute() {
				var ret = GetReturnFrame(PdtInternalType.Number, sizeof(float));
				float v, p;
				switch (LoadedOperandCount) {
					case 1:
						v = oputil.AsNumber(_ctxcb());
						p = GetOperand(0).AsNumber(); break;
					case 2:
						v = GetOperand(0).AsNumber();
						p = GetOperand(1).AsNumber(); break;
					default: throw new ArgumentException("Argument count not 1 or 2");
				}
				double pp = Math.Pow(10, Math.Floor(Math.Log10(Math.Abs(p))) + 1);
				double dp = pp * Math.Round(p / pp, 7);
				ret.SetNumber((float)(Math.Round((double)v / dp) * dp));
			}
		}
		#endregion
		#region Area Functions
		class func_interval : PdtOperator {
			readonly Func<PropSrc> _ctxcb;
			public func_interval(Func<PropSrc> ctxcb) : base(3) { _ctxcb = ctxcb; }
			protected override unsafe void Execute() {
				float min, value, max;
				switch (LoadedOperandCount) {
					case 2:
						value = oputil.AsNumber(_ctxcb());
						min = GetOperand(0).AsNumber();
						max = GetOperand(1).AsNumber();
						break;
					case 3:
						value = GetOperand(0).AsNumber();
						min = GetOperand(1).AsNumber();
						max = GetOperand(2).AsNumber();
						break;
					default: throw new ArgumentException("Argument count not 2 or 3");
				}
				float center = (max + min) / 2;
				float extent = (max - min) / 2;
				var ret = GetReturnFrame(PdtInternalType.Number, sizeof(float));
				ret.SetNumber(1 - Math.Abs(value - center) / extent);
			}
		}
		class func_sphere : PdtOperator {
			readonly Func<PropSrc> _ctxcb;
			public func_sphere(Func<PropSrc> ctxcb) : base(3) { _ctxcb = ctxcb; }
			protected override unsafe void Execute() {
				Vector4? value, center;
				float radius;
				switch (LoadedOperandCount) {
					case 2:
						value = oputil.AsVector(_ctxcb());
						center = oputil.AsVector(GetOperand(0));
						radius = GetOperand(1).AsNumber();
						break;
					case 3:
						value = oputil.AsVector(GetOperand(0));
						center = oputil.AsVector(GetOperand(1));
						radius = GetOperand(2).AsNumber();
						break;
					default: throw new ArgumentException("Argument count not 2 or 3");
				}
				if (value == null) {
					GetReturnFrame(PdtInternalType.Null, 0);
					return;
				}
				if (center == null) throw new ArgumentException("Null sphere center");
				var ret = GetReturnFrame(PdtInternalType.Number, sizeof(float));
				ret.SetNumber(1 - Vector4.Distance(center.Value, value.Value) / radius);
			}
		}
		#endregion
		#region Judge Functions
		#region Primary
		static readonly int _var_fn = IdentifierManager.Shared.Request("judge_time_from");
		static readonly int _var_tn = IdentifierManager.Shared.Request("judge_time_to");
		static readonly int _var_ft = IdentifierManager.Shared.Request("input_time_from");
		static readonly int _var_tt = IdentifierManager.Shared.Request("input_time_to");
		static readonly int _var_fv = IdentifierManager.Shared.Request("input_vec_from");
		static readonly int _var_tv = IdentifierManager.Shared.Request("input_vec_to");
		abstract class JudgeFunction : PdtOperator {
			readonly Func<int, PropSrc> _ctxcb;
			protected JudgeFunction(int pc, Func<int, PropSrc> ctxcb) : base(pc) {
				_ctxcb = ctxcb;
			}
			protected sealed override void Execute() {
				var fn = oputil.AsNumber(_ctxcb(_var_fn));
				var tn = oputil.AsNumber(_ctxcb(_var_tn));
				var ft = oputil.AsNumber(_ctxcb(_var_ft));
				var tt = oputil.AsNumber(_ctxcb(_var_tt));
				var fv = oputil.AsVector(_ctxcb(_var_fv));
				var tv = oputil.AsVector(_ctxcb(_var_tv));
				var result = ExecuteImpl(fn, tn, ft, tt, fv, tv);
				var ret = GetReturnFrame(PdtInternalType.Vector, 6 * sizeof(float) + sizeof(int));
				ret.SetArraySuffix(PdtInternalType.Number);
				ret.SetNumber(result.Value);
				if (result.Value <= 0) return;
				ret.SetNumber(result.Time, sizeof(float));
				Vector4 rv;
				if (result.Time == ft) {
					if (!fv.HasValue) {
						if (result.Time == tt) {
							if (!tv.HasValue) throw new ArgumentException("Internal judge error");
							rv = tv.Value;
						}
						else throw new ArgumentException("Internal judge error");
					}
					else rv = fv.Value;
				}
				else if (result.Time == tt) {
					if (!tv.HasValue) throw new ArgumentException("Internal judge error");
					rv = tv.Value;
				}
				else {
					if (!fv.HasValue || !tv.HasValue) throw new ArgumentException("Internal judge error");
					var tr = (result.Time - ft) / (tt - ft);
					rv = (1 - tr) * fv.Value + tr * tv.Value;
				}
				for (int i = 0; i < 4; i++) {
					ret.SetNumber(rv[i], (i + 2) * sizeof(float));
				}
			}
			protected abstract JudgeFunctionResult ExecuteImpl(float fn, float tn, float ft, float tt, Vector4? fv, Vector4? tv);
			protected struct JudgeFunctionResult {
				/// <summary>
				/// The result value, represented with a signed distance or a result boolean (0 or 1.)
				/// </summary>
				public float Value;
				public float Time;
				public JudgeFunctionResult(float value, float time = 0) {
					Value = value;
					Time = time;
				}
			}
		}
		#region Timing
		class func_attack_timing : JudgeFunction {
			public func_attack_timing(Func<int, PropSrc> ctxcb) : base(2, ctxcb) { }
			protected override JudgeFunctionResult ExecuteImpl(float fn, float tn, float ft, float tt, Vector4? fv, Vector4? tv) {
				if (fv != null) return new JudgeFunctionResult();
				var t0 = GetOperand(0).AsNumber() + fn;
				var t1 = GetOperand(1).AsNumber() + tn;
				return new JudgeFunctionResult((tt > t0 && tt <= t1) ? 1 : 0, tt);
			}
		}
		class func_enter_timing : JudgeFunction {
			public func_enter_timing(Func<int, PropSrc> ctxcb) : base(1, ctxcb) { }
			protected override JudgeFunctionResult ExecuteImpl(float fn, float tn, float ft, float tt, Vector4? fv, Vector4? tv) {
				if (fv == null || tv == null) return new JudgeFunctionResult();
				var t0 = GetOperand(0).AsNumber() + fn;
				return new JudgeFunctionResult((ft < t0 && tt >= t0) ? 1 : 0, t0);
			}
		}
		class func_release_timing : JudgeFunction {
			public func_release_timing(Func<int, PropSrc> ctxcb) : base(2, ctxcb) { }
			protected override JudgeFunctionResult ExecuteImpl(float fn, float tn, float ft, float tt, Vector4? fv, Vector4? tv) {
				if (tv != null) return new JudgeFunctionResult();
				var t0 = GetOperand(0).AsNumber() + fn;
				var t1 = GetOperand(1).AsNumber() + tn;
				return new JudgeFunctionResult((ft > t0 && ft <= t1) ? 1 : 0, ft);
			}
		}
		class func_leave_timing : JudgeFunction {
			public func_leave_timing(Func<int, PropSrc> ctxcb) : base(1, ctxcb) { }
			protected override JudgeFunctionResult ExecuteImpl(float fn, float tn, float ft, float tt, Vector4? fv, Vector4? tv) {
				if (fv == null || tv == null) return new JudgeFunctionResult();
				var t1 = GetOperand(0).AsNumber() + tn;
				return new JudgeFunctionResult((ft < t1 && tt >= t1) ? 1 : 0, t1);
			}
		}
		#endregion
		#region Timed Area / Timing Area
		abstract class AreaJudgeFunction : JudgeFunction {
			readonly Func<int, PdtExpression> _jacb;
			readonly PdtEvaluator _etor;
			float _area;
			readonly PropOp _areaOp;
			Vector4 _vec;
			readonly PropSrc _vecSrc;
			PdtExpression _areaFunc;
			public AreaJudgeFunction(int pc, Func<int, PropSrc> ctxcb, Func<int, PdtExpression> jacb, PdtEvaluator etor) : base(pc, ctxcb) {
				_jacb = jacb;
				_etor = etor;
				_areaOp = new PropOp.Float(v => _area = v);
				_vecSrc = new PropSrc.Vector4(() => _vec);
			}
			protected sealed override JudgeFunctionResult ExecuteImpl(float fn, float tn, float ft, float tt, Vector4? fv, Vector4? tv) {
				_areaFunc = _jacb(GetOperand(2).AsIdentifier());
				return ExecuteImpl2(fn, tn, ft, tt, fv, tv);
			}
			protected abstract JudgeFunctionResult ExecuteImpl2(float fn, float tn, float ft, float tt, Vector4? fv, Vector4? tv);
			protected float EvaluateArea(Vector4? vec) {
				if (vec == null) {
					_etor.ContextSelfValue = PropSrc.Null;
				}
				else {
					_vec = vec.Value;
					_vecSrc.Invalidate();
					_etor.ContextSelfValue = _vecSrc;
				}
				_etor.Evaluate(_areaOp, _areaFunc);
				_etor.ContextSelfValue = null;
				return _area;
			}
			protected JudgeFunctionResult IntersectsWithAreaBounds(float ft, float tt, Vector4 fiv, Vector4 tiv, bool enter) {
				for (int i = 1; i <= ChartPlayer.areaJudgePrecision; i++) {
					float r = (float)i / ChartPlayer.areaJudgePrecision;
					if ((EvaluateArea((1 - r) * fiv + r * tiv) > 0) == enter) {
						float l = (float)(i - 1) / ChartPlayer.areaJudgePrecision;
						while (!Mathf.Approximately(l, r)) {
							float m = (l + r) / 2;
							float v = EvaluateArea((1 - m) * fiv + m * tiv);
							if (v == 0) return new JudgeFunctionResult(1, (1 - m) * ft + m * tt);
							else if ((v > 0) == enter) r = m;
							else l = m;
						}
						return new JudgeFunctionResult(1, (1 - l) * ft + l * tt);
					}
				}
				return new JudgeFunctionResult();
			}
			protected bool GetInternalTimeAndVector(float t0, float t1, ref float ft, ref float tt, ref Vector4 fv, ref Vector4 tv) {
				if (ft < t0) {
					if (tt < t0) return false;
					var fr = (t0 - ft) / (tt - ft);
					ft = (1 - fr) * ft + fr * tt;
					fv = (1 - fr) * fv + fr * tv;
				}
				else if (ft < t1) { }
				else return false;

				if (tt < t1) { }
				else {
					var tr = (t1 - ft) / (tt - ft);
					tt = (1 - tr) * ft + tr * tt;
					tv = (1 - tr) * fv + tr * tv;
				}
				return true;
			}
		}
		class func_attack_timed_area : AreaJudgeFunction {
			public func_attack_timed_area(Func<int, PropSrc> ctxcb, Func<int, PdtExpression> jacb, PdtEvaluator etor) : base(3, ctxcb, jacb, etor) { }
			protected override JudgeFunctionResult ExecuteImpl2(float fn, float tn, float ft, float tt, Vector4? fv, Vector4? tv) {
				if (fv != null) return new JudgeFunctionResult();
				var t0 = GetOperand(0).AsNumber() + fn;
				var t1 = GetOperand(1).AsNumber() + tn;
				if (tt <= t0 || tt > t1) return new JudgeFunctionResult();
				return new JudgeFunctionResult(EvaluateArea(tv), tt);
			}
		}
		class func_release_timed_area : AreaJudgeFunction {
			public func_release_timed_area(Func<int, PropSrc> ctxcb, Func<int, PdtExpression> jacb, PdtEvaluator etor) : base(3, ctxcb, jacb, etor) { }
			protected override JudgeFunctionResult ExecuteImpl2(float fn, float tn, float ft, float tt, Vector4? fv, Vector4? tv) {
				if (tv != null) return new JudgeFunctionResult();
				var t0 = GetOperand(0).AsNumber() + fn;
				var t1 = GetOperand(1).AsNumber() + tn;
				if (ft <= t0 || ft > t1) return new JudgeFunctionResult();
				return new JudgeFunctionResult(EvaluateArea(fv), ft);
			}
		}
		class func_enter_or_leave_timed_area : AreaJudgeFunction {
			readonly bool _enter;
			public func_enter_or_leave_timed_area(Func<int, PropSrc> ctxcb, Func<int, PdtExpression> jacb, PdtEvaluator etor, bool enter) : base(3, ctxcb, jacb, etor) {
				_enter = enter;
			}
			protected override JudgeFunctionResult ExecuteImpl2(float fn, float tn, float ft, float tt, Vector4? fv, Vector4? tv) {
				if (fv == null || tv == null) return new JudgeFunctionResult();
				var t0 = GetOperand(0).AsNumber() + fn;
				var t1 = GetOperand(1).AsNumber() + tn;
				Vector4 fiv = fv.Value, tiv = tv.Value;
				if (!GetInternalTimeAndVector(t0, t1, ref ft, ref tt, ref fiv, ref tiv)) return new JudgeFunctionResult();
				if ((EvaluateArea(fiv) > 0) == _enter) return new JudgeFunctionResult();
				return IntersectsWithAreaBounds(ft, tt, fiv, tiv, _enter);
			}
		}
		class func_enter_or_leave_timing_area : AreaJudgeFunction {
			readonly bool _enter;
			public func_enter_or_leave_timing_area(Func<int, PropSrc> ctxcb, Func<int, PdtExpression> jacb, PdtEvaluator etor, bool enter) : base(3, ctxcb, jacb, etor) {
				_enter = enter;
			}
			protected override JudgeFunctionResult ExecuteImpl2(float fn, float tn, float ft, float tt, Vector4? fv, Vector4? tv) {
				if (fv == null || tv == null) return new JudgeFunctionResult();
				var t0 = GetOperand(0).AsNumber() + fn;
				var t1 = GetOperand(1).AsNumber() + tn;
				if ((EvaluateArea(fv) > 0 && ft > t0 && ft < t1) == _enter) return new JudgeFunctionResult();
				Vector4 fiv = fv.Value, tiv = tv.Value;
				if (!GetInternalTimeAndVector(t0, t1, ref ft, ref tt, ref fiv, ref tiv)) return new JudgeFunctionResult();
				return IntersectsWithAreaBounds(ft, tt, fiv, tiv, _enter);
			}
		}
		#endregion
		#endregion
		#region Secondary
		static readonly int _var_jt = IdentifierManager.Shared.Request("hit_time");
		static readonly int _var_jv = IdentifierManager.Shared.Request("hit_vec");
		class func_in_timing : PdtOperator {
			readonly Func<int, PropSrc> _ctxcb;
			public func_in_timing(Func<int, PropSrc> ctxcb) : base(2) {
				_ctxcb = ctxcb;
			}
			protected sealed override void Execute() {
				var fn = oputil.AsNumber(_ctxcb(_var_fn));
				var tn = oputil.AsNumber(_ctxcb(_var_tn));
				var t0 = GetOperand(0).AsNumber() + fn;
				var t1 = GetOperand(1).AsNumber() + tn;
				var jt = oputil.AsNumber(_ctxcb(_var_jt));
				var ret = GetReturnFrame(PdtInternalType.Number, sizeof(float));
				ret.SetNumber((jt > t0 && jt <= t1) ? 1 : 0);
			}
		}
		class func_in_area : PdtOperator {
			readonly Func<int, PropSrc> _ctxcb;
			readonly Func<int, PdtExpression> _jacb;
			readonly PdtEvaluator _etor;
			float _area;
			readonly PropOp _areaOp;
			Vector4 _vec;
			readonly PropSrc _vecSrc;
			public func_in_area(Func<int, PropSrc> ctxcb, Func<int, PdtExpression> jacb, PdtEvaluator etor) : base(2) {
				_ctxcb = ctxcb;
				_jacb = jacb;
				_etor = etor;
				_areaOp = new PropOp.Float(v => _area = v);
				_vecSrc = new PropSrc.Vector4(() => _vec);
			}
			protected sealed override void Execute() {
				var jv = oputil.AsVector(_ctxcb(_var_jv));
				if (jv == null) {
					_etor.ContextSelfValue = PropSrc.Null;
				}
				else {
					_vec = jv.Value;
					_vecSrc.Invalidate();
					_etor.ContextSelfValue = _vecSrc;
				}
				_etor.Evaluate(_areaOp, _jacb(GetOperand(0).AsIdentifier()));
				_etor.ContextSelfValue = null;
				var ret = GetReturnFrame(PdtInternalType.Number, sizeof(float));
				ret.SetNumber(_area);
			}
		}
		#endregion
		#endregion
		static unsafe class oputil {
			public static float AsNumber(PropSrc src) {
				if (src == null) throw new ArgumentNullException("src");
				src.Get(out int type, out byte[] value);
				if (type != PdtInternalType.Number && type != PdtInternalType.Vector)
					throw new ArgumentException("Not a number");
				fixed (byte* ptr = value) {
					return *(float*)ptr;
				}
			}
			public static Vector4? AsVector(PropSrc src) {
				if (src == null) throw new ArgumentNullException("src");
				src.Get(out int type, out byte[] value);
				if (type == PdtInternalType.Vector) {
					fixed (byte* ptr = value) {
						return *(Vector4*)ptr;
					}
				}
				else if (type == PdtInternalType.Number) {
					fixed (byte* ptr = value) {
						return new Vector4(*(float*)ptr, 0, 0, 0);
					}
				}
				else if (type == PdtInternalType.Null) {
					return null;
				}
				else throw new ArgumentException("Not a vector");
			}
			public static Vector4? AsVector(PdtVariableMemory op) {
				if (op.Type == PdtInternalType.Vector) {
					return ((op.Length - sizeof(int)) / sizeof(float)) switch {
						0 => null,
						1 => (Vector4?)new Vector4(op.AsNumber(), 0, 0, 0),
						2 => (Vector4?)new Vector4(op.AsNumber(), op.AsNumber(sizeof(float)), 0, 0),
						3 => (Vector4?)new Vector4(op.AsNumber(), op.AsNumber(sizeof(float)), op.AsNumber(2 * sizeof(float)), 0),
						_ => (Vector4?)new Vector4(op.AsNumber(), op.AsNumber(sizeof(float)), op.AsNumber(2 * sizeof(float)), op.AsNumber(3 * sizeof(float))),
					};
				}
				else if (op.Type == PdtInternalType.Number) {
					return new Vector4(op.AsNumber(), 0, 0, 0);
				}
				else if (op.Type == PdtInternalType.Null) {
					return null;
				}
				else throw new ArgumentException("Not a vector");
			}
		}
#pragma warning restore IDE1006
		#endregion
	}
}