using System.Collections.Generic;
using SepCore.Event;
using UnityGameFramework.Runtime;

namespace SepCore.UI
{
    public partial class SelectRoleForm
    {
        private readonly List<RoleItem> _roleItems = new List<RoleItem>();

        private SelectRoleContext _context = null;

        private bool _listenersBound;

        public void RefreshUI(SelectRoleContext context)
        {
            EnsureButtonListeners();

            _context = context;

            EnsureRoleItemCount(context.RoleItemContexts.Length);

            RoleItemContext[] roleContexts = _context.RoleItemContexts;
            for (int i = 0; i < _roleItems.Count; i++)
            {
                RoleItem item = _roleItems[i];
                if (i < roleContexts.Length)
                {
                    item.OnInit(roleContexts[i]).Forget();
                    item.gameObject.SetActive(true);
                }
                else
                {
                    item.OnReset();
                    item.gameObject.SetActive(false);
                }
            }

            if (_context.ShowRoleProperty)
            {
                View.showAreaForm.ShowRoleProperty(_context.ShowAreaContext);
            }
            else
            {
                View.showAreaForm.ShowRandomRole();
            }
        }

        #region Lifecycle

        protected override void OnOpen(object userData)
        {
            base.OnOpen(userData);

            if (userData is SelectRoleContext context)
            {
                RefreshUI(context);
                return;
            }

            Log.Error("SelectRoleForm requires SelectRoleContext as userData.");
        }

        protected override void OnClose(bool isShutdown, object userData)
        {
            base.OnClose(isShutdown, userData);

            _context = null;
            for (int i = 0; i < _roleItems.Count; i++)
            {
                _roleItems[i].OnReset();
            }
        }

        #endregion

        private void EnsureButtonListeners()
        {
            if (_listenersBound)
            {
                return;
            }

            _listenersBound = true;

            View.returnButton.onClick.AddListener(OnReturnButtonClick);
            View.randomRoleItem.onClick.AddListener(OnRandomConfirmClick);
            View.randomRoleItem.RegisterPointerEnterAction(OnRandomHoverEnter);
        }

        private void EnsureRoleItemCount(int count)
        {
            while (_roleItems.Count < count)
            {
                RoleItem item = Instantiate(View.roleItemTemplate, View.roleListRoot);
                _roleItems.Add(item);
            }
        }

        private void OnReturnButtonClick()
        {
            GameEntry.Event.Fire(this, SelectRoleReturnEventArgs.Create());
        }

        private void OnRandomConfirmClick()
        {
            GameEntry.Event.Fire(this, SelectRoleConfirmEventArgs.Create());
        }

        private void OnRandomHoverEnter()
        {
            GameEntry.Event.Fire(this, SelectRoleClearEventArgs.Create());
        }
    }
}