using System.Collections.Generic;
using GeometryTD.Entity;
using GeometryTD.UI;
using UnityEngine;

namespace GeometryTD.Map
{
    public sealed class TowerSelectionPresenter
    {
        private bool _hasSelectedFoundationCell;
        private Vector3Int _selectedFoundationCell;
        private int _selectedTowerEntityId;
        private int _attackRangeVisibleTowerEntityId;

        public void ApplySelectedObject(CombatSelectFormUserData userData)
        {
            if (userData == null)
            {
                ClearSelectedObject();
                return;
            }

            switch (userData.ClickObjectType)
            {
                case CombatSelectClickObjectType.Foundation:
                    _hasSelectedFoundationCell = true;
                    _selectedFoundationCell = userData.CellPosition;
                    _selectedTowerEntityId = 0;
                    break;
                case CombatSelectClickObjectType.Tower:
                    _hasSelectedFoundationCell = true;
                    _selectedFoundationCell = userData.CellPosition;
                    _selectedTowerEntityId = userData.TowerEntityId;
                    break;
                default:
                    ClearSelectedObject();
                    return;
            }

            UpdateTowerAttackRangeDisplay(_selectedTowerEntityId);
        }

        public void SelectTower(Vector3Int foundationCell, int towerEntityId)
        {
            _hasSelectedFoundationCell = true;
            _selectedFoundationCell = foundationCell;
            _selectedTowerEntityId = towerEntityId;
            UpdateTowerAttackRangeDisplay(_selectedTowerEntityId);
        }

        public bool TryGetSelectedFoundationCell(out Vector3Int foundationCell)
        {
            foundationCell = default;
            if (!_hasSelectedFoundationCell)
            {
                return false;
            }

            foundationCell = _selectedFoundationCell;
            return true;
        }

        public bool TryGetSelectedTower(IReadOnlyDictionary<int, Vector3Int> foundationCellByTowerEntityId,
            out int towerEntityId, out Vector3Int foundationCell)
        {
            towerEntityId = 0;
            foundationCell = default;
            if (_selectedTowerEntityId == 0 || foundationCellByTowerEntityId == null)
            {
                return false;
            }

            if (!foundationCellByTowerEntityId.TryGetValue(_selectedTowerEntityId, out foundationCell))
            {
                return false;
            }

            towerEntityId = _selectedTowerEntityId;
            return true;
        }

        public void ClearSelectedObject()
        {
            UpdateTowerAttackRangeDisplay(0);
            _hasSelectedFoundationCell = false;
            _selectedFoundationCell = default;
            _selectedTowerEntityId = 0;
        }

        private void UpdateTowerAttackRangeDisplay(int towerEntityId)
        {
            if (_attackRangeVisibleTowerEntityId != 0 && _attackRangeVisibleTowerEntityId != towerEntityId)
            {
                SetTowerAttackRangeVisible(_attackRangeVisibleTowerEntityId, false);
                _attackRangeVisibleTowerEntityId = 0;
            }

            if (towerEntityId == 0)
            {
                if (_attackRangeVisibleTowerEntityId != 0)
                {
                    SetTowerAttackRangeVisible(_attackRangeVisibleTowerEntityId, false);
                    _attackRangeVisibleTowerEntityId = 0;
                }

                return;
            }

            if (SetTowerAttackRangeVisible(towerEntityId, true))
            {
                _attackRangeVisibleTowerEntityId = towerEntityId;
            }
        }

        private static bool SetTowerAttackRangeVisible(int towerEntityId, bool visible)
        {
            if (towerEntityId == 0 || GameEntry.Entity == null)
            {
                return false;
            }

            EntityBase gameEntity = GameEntry.Entity.GetGameEntity(towerEntityId);
            if (gameEntity is not TowerEntity towerEntity)
            {
                return false;
            }

            towerEntity.SetAttackRangeVisible(visible);
            return true;
        }
    }


}