using Cryville.Common;
using Cryville.Common.Pdt;
using Cryville.Crtr.Components;
using System;
using UnityEngine;

namespace Cryville.Crtr {
	public abstract class SkinPropertyKey {
		public abstract override string ToString();
		public abstract bool IsValueRequired { get; }
		public abstract void ExecuteStatic(ISkinnableGroup group, RuntimeSkinContext ctx, PdtExpression exp);
		public abstract void ExecuteDynamic(ISkinnableGroup group, RuntimeSkinContext ctx, PdtExpression exp);
		public class CreateComponent : SkinPropertyKey {
			public Type Component { get; set; }
			public override string ToString() {
				return string.Format("*{0}", Component.Name);
			}
			public override bool IsValueRequired { get { return false; } }
			public override void ExecuteStatic(ISkinnableGroup group, RuntimeSkinContext ctx, PdtExpression exp) {
				ctx.WriteTransform.gameObject.AddComponent(Component);
			}
			public override void ExecuteDynamic(ISkinnableGroup group, RuntimeSkinContext ctx, PdtExpression exp) {
				throw new InvalidOperationException("Component creation in dynamic context is not allowed");
			}
		}
		public class SetProperty : SkinPropertyKey {
			public Type Component { get; set; }
			public int Name { get; set; }
			public override string ToString() {
				return string.Format("{0}.{1}", Component.Name, IdentifierManager.SharedInstance.Retrieve(Name));
			}
			public override bool IsValueRequired { get { return true; } }
			public override void ExecuteStatic(ISkinnableGroup group, RuntimeSkinContext ctx, PdtExpression exp) {
				Execute(ctx, GetPropOp(ctx.WriteTransform).Operator, exp);
			}
			public override void ExecuteDynamic(ISkinnableGroup group, RuntimeSkinContext ctx, PdtExpression exp) {
				var prop = GetPropOp(ctx.WriteTransform);
				if (group.DynamicLevel > prop.UpdateDynamicLevel) return;
				Execute(ctx, prop.Operator, exp);
			}
			void Execute(RuntimeSkinContext ctx, PdtOperator op, PdtExpression exp) {
				var psrcs = ctx.ReadContext.PropSrcs;
				if (psrcs != null) ChartPlayer.etor.ContextCascadeInsert(psrcs);
				ChartPlayer.etor.Evaluate(op, exp);
				if (psrcs != null) ChartPlayer.etor.ContextCascadeDiscard();
			}
			SkinProperty GetPropOp(Transform obj) {
				var ctype = Component;
				var comp = (SkinComponent)obj.GetComponent(ctype);
				if (comp == null) throw new InvalidOperationException(string.Format(
					"Trying to set property \"{0}\" but the component is not found",
					IdentifierManager.SharedInstance.Retrieve(Name)
				));
				SkinProperty result;
				if (!comp.Properties.TryGetValue(Name, out result))
					throw new InvalidOperationException(string.Format(
						"Property \"{0}\" not found on component",
						IdentifierManager.SharedInstance.Retrieve(Name)
					));
				return result;
			}
		}
		public class CreateAnchor : SkinPropertyKey {
			public int Name { get; set; }
			public override string ToString() {
				return string.Format("@has {0}", IdentifierManager.SharedInstance.Retrieve(Name));
			}
			public override bool IsValueRequired { get { return false; } }
			public override void ExecuteStatic(ISkinnableGroup group, RuntimeSkinContext ctx, PdtExpression exp) {
				group.RegisterAnchor(Name);
			}
			public override void ExecuteDynamic(ISkinnableGroup group, RuntimeSkinContext ctx, PdtExpression exp) {
				throw new InvalidOperationException("Anchor creation in dynamic context is not allowed");
			}
		}
		public class SetAnchor : SkinPropertyKey {
			public int Name { get; set; }
			public SetAnchor() {
				_timeOp = new PropOp.Float(v => _time = v);
			}
			public override string ToString() {
				return string.Format("@at {0}", IdentifierManager.SharedInstance.Retrieve(Name));
			}
			public override bool IsValueRequired { get { return true; } }
			public override void ExecuteStatic(ISkinnableGroup group, RuntimeSkinContext ctx, PdtExpression exp) {
				throw new InvalidOperationException("Setting anchor in static context is not allowed");
			}
			float _time;
			readonly PropOp _timeOp;
			public override void ExecuteDynamic(ISkinnableGroup group, RuntimeSkinContext ctx, PdtExpression exp) {
				if (group.DynamicLevel > 0) return;
				var psrcs = ctx.ReadContext.PropSrcs;
				if (psrcs != null) ChartPlayer.etor.ContextCascadeInsert(psrcs);
				ChartPlayer.etor.Evaluate(_timeOp, exp);
				if (psrcs != null) ChartPlayer.etor.ContextCascadeDiscard();
				group.PushAnchorEvent(_time, Name);
			}
		}
		public class EmitEffect : SkinPropertyKey {
			public int Name { get; set; }
			public EmitEffect() { }
			public override string ToString() {
				return string.Format("@emit {0}", IdentifierManager.SharedInstance.Retrieve(Name));
			}
			public override bool IsValueRequired { get { return true; } }
			public override void ExecuteStatic(ISkinnableGroup group, RuntimeSkinContext ctx, PdtExpression exp) {
				// TODO
			}
			public override void ExecuteDynamic(ISkinnableGroup group, RuntimeSkinContext ctx, PdtExpression exp) {
				// TODO
			}
		}
	}
}