using System;
using System.Collections.Generic;
using UnityEngine;

namespace AlicizaX
{
    internal class ProcedureService : ServiceBase, IProcedureService, IServiceTickable
    {
        private readonly Dictionary<Type, IProcedure> _procedures = new Dictionary<Type, IProcedure>();
        private IProcedure _currentProcedure;
        private IProcedure _defaultProcedure;

        public Type CurrentProcedureType => _currentProcedure?.GetType();

        public void InitializeProcedure(IEnumerable<IProcedure> availableProcedures, Type defaultProcedureType)
        {
            _procedures.Clear();
            foreach (var procedure in availableProcedures)
            {
                if (procedure == null)
                {
                    continue;
                }

                var type = procedure.GetType();
                _procedures[type] = procedure;
                procedure.ProcedureService = this;
                procedure.Init();
            }

            if (_procedures.TryGetValue(defaultProcedureType, out var defaultProcedure))
            {
                _defaultProcedure = defaultProcedure;
                TrySwitchProcedure(defaultProcedureType);
            }
            else
            {
                Log.Info($"榛樿娴佺▼ {defaultProcedureType.Name} 鏈敞鍐?");
            }
        }

        public void ClearAllProcedures()
        {
            foreach (var procedure in _procedures.Values)
            {
                procedure.Destroy();
            }

            _procedures.Clear();
            _currentProcedure = null;
            _defaultProcedure = null;
        }

        public bool ContainsProcedure(Type procedureType)
        {
            return procedureType != null && _procedures.ContainsKey(procedureType);
        }

        public bool TrySwitchProcedure(Type procedureType)
        {
            if (procedureType == null)
            {
                return false;
            }

            if (!_procedures.TryGetValue(procedureType, out var nextProcedure))
            {
                if (_defaultProcedure == null)
                {
                    return false;
                }

                Debug.LogWarning($"娴佺▼ {procedureType.Name} 涓嶅瓨鍦紝鍒囨崲鍒伴粯璁ゆ祦绋?");
                nextProcedure = _defaultProcedure;
            }

            if (ReferenceEquals(_currentProcedure, nextProcedure))
            {
                return true;
            }

            _currentProcedure?.Leave();
            nextProcedure.Enter();
            _currentProcedure = nextProcedure;
            return true;
        }

        protected override void OnInitialize()
        {
        }

        protected override void OnDestroyService()
        {
            ClearAllProcedures();
        }

        void IServiceTickable.Tick(float deltaTime)
        {
            _currentProcedure?.Update();
        }
    }
}