#if UNITY_EDITOR
using System.Linq;
using Unity.VisualScripting;
using UnityCodeGen;
using UnityEditor;

namespace Code.Infrastructure.Generators
{
    [Generator]
    public class StateMachineGenerator : ICodeGenerator
    {
        public void Execute(GeneratorContext context)
        {
            GenerateStates(context);
            
            GenerateStateMachine(context);
        }

        private void GenerateStateMachine(GeneratorContext context)
        {
            var stateMachines = TypeCache.GetTypesWithAttribute<StateMachine>();

            foreach (var sm in stateMachines)
            {
                var attribute = sm.GetAttribute<StateMachine>();

                var states = TypeCache.GetTypesWithAttribute<State>()
                    .Where(st =>
                        st.GetAttribute<State>().StateMachineContext.FullName ==
                        attribute.StateMachineContextType.FullName);

                var statesCode = "";
                var statesNamespacesCode = "";

                foreach (var st in states)
                {
                    statesNamespacesCode += $@" 
using {st.Namespace};
";
                    statesCode += $@"
var state{st.Name} = new {st.Name}(StateMachineContext,eventBus);
States.Add(state{st.Name}.myState, state{st.Name});
";
                }

                var stateMachineCode =
                    $@"
// <auto-generated/>
#pragma warning disable CS0105 
using Code.Infrastructure.StateMachine;
{statesNamespacesCode}
#pragma warning restore CS0105
namespace {sm.Namespace}
{{

public partial class {sm.Name} : AbstractStateMachine<{attribute.StateMachineEnumType.FullName},{attribute.StateMachineContextType.FullName}>
{{
      
        public {sm.Name}({attribute.StateMachineContextType.FullName} context, EventBus.EventBus eventBus) : base(context)
        {{ 
            {statesCode}
        }}

        protected override bool CheckTransitionAllowed({attribute.StateMachineEnumType.FullName} nextState) => AllowedStates.HasFlag(nextState);
        protected override void ResetAllowedTransitions() => AllowedStates = 0; 
}}

    public static class {sm.Name}Extensions
    {{
        public static AbstractStateMachine<{attribute.StateMachineEnumType.FullName}, {attribute.StateMachineContextType.FullName}> AllowStateTransition(
            this AbstractStateMachine<{attribute.StateMachineEnumType.FullName}, {attribute.StateMachineContextType.FullName}> stateMachine, {attribute.StateMachineEnumType.FullName} state)
        {{
            if (stateMachine == null) return null;

            stateMachine.AllowedStates |= state;
            return stateMachine;
        }}
    }}
}}

";

                context.AddCode($"{sm.FullName}.Generated.cs", stateMachineCode);
            }
        }

        private void GenerateStates(GeneratorContext context)
        { 
            var states = TypeCache.GetTypesWithAttribute<State>();

            var statesCode = "";
            foreach (var st in states)
            {
                var attribute = st.GetAttribute<State>();

            var fireStatesCode = "";
                if(st.HasAttribute<StateRaisingEvent>()) fireStatesCode = $@"        
protected override void _fireEnterState()
        {{
            EventBus.RaiseEvent<IEnterStateHandle<{st.FullName}>>(h => h.EnterState());
        }}

        protected override void _fireExitState()
        {{
            EventBus.RaiseEvent<IExitStateHandle<{st.FullName}>>(h => h.ExitState());
        }}
";
                var genetics = "";
                if(!attribute.SilentBitch) genetics = $@" : BaseState<{attribute.StateEnum.FullName}, {attribute.StateMachineContext.FullName}>";
                
                statesCode = $@"

// retard-generated

using Code.Infrastructure.StateMachine;

namespace {st.Namespace}
{{
    public partial class {st.Name} {genetics}
    {{
        {fireStatesCode}
    }}  
}}
";


                context.AddCode($"{st.FullName}.Generated.cs", statesCode);
                
            }
        }
    }
}
#endif