using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Windows.Forms;
using AGVMapEditor.Models;
using AGVMapEditor.Controls;
using Newtonsoft.Json;

namespace AGVMapEditor.Forms
{
    /// <summary>
    /// AGV 맵 에디터 메인 폼
    /// </summary>
    public partial class MainForm : Form
    {
        #region Fields

        private NodeResolver _nodeResolver;
        private List<MapNode> _mapNodes;
        private List<RfidMapping> _rfidMappings;
        private MapCanvas _mapCanvas;
        
        // 현재 선택된 노드
        private MapNode _selectedNode;
        
        // 파일 경로
        private string _currentMapFile = string.Empty;
        private bool _hasChanges = false;

        #endregion

        #region Constructor

        public MainForm()
        {
            InitializeComponent();
            InitializeData();
            InitializeMapCanvas();
            UpdateTitle();
        }

        #endregion

        #region Initialization

        private void InitializeData()
        {
            _mapNodes = new List<MapNode>();
            _rfidMappings = new List<RfidMapping>();
            _nodeResolver = new NodeResolver(_rfidMappings, _mapNodes);
        }

        private void InitializeMapCanvas()
        {
            _mapCanvas = new MapCanvas(_mapNodes);
            _mapCanvas.Dock = DockStyle.Fill;
            _mapCanvas.NodeSelected += OnNodeSelected;
            _mapCanvas.NodeMoved += OnNodeMoved;
            _mapCanvas.BackgroundClicked += OnBackgroundClicked;
            
            // 스플리터 패널에 맵 캔버스 추가
            splitContainer1.Panel2.Controls.Add(_mapCanvas);
        }

        #endregion

        #region Event Handlers

        private void MainForm_Load(object sender, EventArgs e)
        {
            RefreshNodeList();
            RefreshRfidMappingList();
        }

        private void OnNodeSelected(object sender, MapNode node)
        {
            _selectedNode = node;
            UpdateNodeProperties();
        }

        private void OnNodeMoved(object sender, MapNode node)
        {
            _hasChanges = true;
            UpdateTitle();
            RefreshNodeList();
        }

        private void OnBackgroundClicked(object sender, Point location)
        {
            _selectedNode = null;
            ClearNodeProperties();
        }

        #endregion

        #region Menu Event Handlers

        private void newToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (CheckSaveChanges())
            {
                NewMap();
            }
        }

        private void openToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (CheckSaveChanges())
            {
                OpenMap();
            }
        }

        private void saveToolStripMenuItem_Click(object sender, EventArgs e)
        {
            SaveMap();
        }

        private void saveAsToolStripMenuItem_Click(object sender, EventArgs e)
        {
            SaveAsMap();
        }

        private void exitToolStripMenuItem_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        #endregion

        #region Button Event Handlers

        private void btnAddNode_Click(object sender, EventArgs e)
        {
            AddNewNode();
        }

        private void btnDeleteNode_Click(object sender, EventArgs e)
        {
            DeleteSelectedNode();
        }

        private void btnAddConnection_Click(object sender, EventArgs e)
        {
            AddConnectionToSelectedNode();
        }

        private void btnRemoveConnection_Click(object sender, EventArgs e)
        {
            RemoveConnectionFromSelectedNode();
        }

        private void btnAddRfidMapping_Click(object sender, EventArgs e)
        {
            AddNewRfidMapping();
        }

        private void btnDeleteRfidMapping_Click(object sender, EventArgs e)
        {
            DeleteSelectedRfidMapping();
        }

        #endregion

        #region Node Management

        private void AddNewNode()
        {
            var nodeId = GenerateNodeId();
            var nodeName = $"노드{_mapNodes.Count + 1}";
            var position = new Point(100 + _mapNodes.Count * 50, 100 + _mapNodes.Count * 50);
            
            var node = new MapNode(nodeId, nodeName, position, NodeType.Normal);
            
            _mapNodes.Add(node);
            _hasChanges = true;
            
            RefreshNodeList();
            RefreshMapCanvas();
            UpdateTitle();
        }

        private void DeleteSelectedNode()
        {
            if (_selectedNode == null)
            {
                MessageBox.Show("삭제할 노드를 선택하세요.", "알림", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }

            var result = MessageBox.Show($"노드 '{_selectedNode.Name}'를 삭제하시겠습니까?\n연결된 RFID 매핑도 함께 삭제됩니다.", 
                                       "삭제 확인", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
            
            if (result == DialogResult.Yes)
            {
                _nodeResolver.RemoveMapNode(_selectedNode.NodeId);
                _selectedNode = null;
                _hasChanges = true;
                
                RefreshNodeList();
                RefreshRfidMappingList();
                RefreshMapCanvas();
                ClearNodeProperties();
                UpdateTitle();
            }
        }

        private void AddConnectionToSelectedNode()
        {
            if (_selectedNode == null)
            {
                MessageBox.Show("연결을 추가할 노드를 선택하세요.", "알림", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }

            // 다른 노드들 중에서 선택
            var availableNodes = _mapNodes.Where(n => n.NodeId != _selectedNode.NodeId && 
                                                !_selectedNode.ConnectedNodes.Contains(n.NodeId)).ToList();
            
            if (availableNodes.Count == 0)
            {
                MessageBox.Show("연결 가능한 노드가 없습니다.", "알림", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }

            // 간단한 선택 다이얼로그 (실제로는 별도 폼을 만들어야 함)
            var nodeNames = availableNodes.Select(n => $"{n.NodeId}: {n.Name}").ToArray();
            var input = Microsoft.VisualBasic.Interaction.InputBox("연결할 노드를 선택하세요:", "노드 연결", nodeNames[0]);
            
            var targetNode = availableNodes.FirstOrDefault(n => input.StartsWith(n.NodeId));
            if (targetNode != null)
            {
                _selectedNode.AddConnection(targetNode.NodeId);
                _hasChanges = true;
                RefreshMapCanvas();
                UpdateNodeProperties();
                UpdateTitle();
            }
        }

        private void RemoveConnectionFromSelectedNode()
        {
            if (_selectedNode == null || _selectedNode.ConnectedNodes.Count == 0)
            {
                MessageBox.Show("연결을 제거할 노드를 선택하거나 연결된 노드가 없습니다.", "알림", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }

            // 연결된 노드들 중에서 선택
            var connectedNodeNames = _selectedNode.ConnectedNodes.Select(connectedNodeId => 
            {
                var node = _mapNodes.FirstOrDefault(n => n.NodeId == connectedNodeId);
                return node != null ? $"{node.NodeId}: {node.Name}" : connectedNodeId;
            }).ToArray();

            var input = Microsoft.VisualBasic.Interaction.InputBox("제거할 연결을 선택하세요:", "연결 제거", connectedNodeNames[0]);
            
            var targetNodeId = input.Split(':')[0];
            if (_selectedNode.ConnectedNodes.Contains(targetNodeId))
            {
                _selectedNode.RemoveConnection(targetNodeId);
                _hasChanges = true;
                RefreshMapCanvas();
                UpdateNodeProperties();
                UpdateTitle();
            }
        }

        private string GenerateNodeId()
        {
            int counter = 1;
            string nodeId;
            
            do
            {
                nodeId = $"N{counter:D3}";
                counter++;
            } while (_mapNodes.Any(n => n.NodeId == nodeId));
            
            return nodeId;
        }

        #endregion

        #region RFID Mapping Management

        private void AddNewRfidMapping()
        {
            if (_mapNodes.Count == 0)
            {
                MessageBox.Show("매핑할 노드가 없습니다. 먼저 노드를 추가하세요.", "알림", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }

            var unmappedNodes = _nodeResolver.GetUnmappedNodes();
            if (unmappedNodes.Count == 0)
            {
                MessageBox.Show("모든 노드가 이미 RFID에 매핑되어 있습니다.", "알림", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }

            // RFID 값 입력
            var rfidValue = Microsoft.VisualBasic.Interaction.InputBox("RFID 값을 입력하세요:", "RFID 매핑 추가");
            if (string.IsNullOrEmpty(rfidValue))
                return;

            // 노드 선택
            var nodeNames = unmappedNodes.Select(n => $"{n.NodeId}: {n.Name}").ToArray();
            var selectedNode = Microsoft.VisualBasic.Interaction.InputBox("매핑할 노드를 선택하세요:", "노드 선택", nodeNames[0]);
            
            var nodeId = selectedNode.Split(':')[0];
            var description = Microsoft.VisualBasic.Interaction.InputBox("설명을 입력하세요 (선택사항):", "설명");

            if (_nodeResolver.AddRfidMapping(rfidValue, nodeId, description))
            {
                _hasChanges = true;
                RefreshRfidMappingList();
                UpdateTitle();
                MessageBox.Show("RFID 매핑이 추가되었습니다.", "성공", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            else
            {
                MessageBox.Show("RFID 매핑 추가에 실패했습니다. 중복된 RFID이거나 노드가 존재하지 않습니다.", "오류", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void DeleteSelectedRfidMapping()
        {
            if (listBoxRfidMappings.SelectedItem == null)
            {
                MessageBox.Show("삭제할 RFID 매핑을 선택하세요.", "알림", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }

            var mapping = listBoxRfidMappings.SelectedItem as RfidMapping;
            var result = MessageBox.Show($"RFID 매핑 '{mapping.RfidId} → {mapping.LogicalNodeId}'를 삭제하시겠습니까?", 
                                       "삭제 확인", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
            
            if (result == DialogResult.Yes)
            {
                if (_nodeResolver.RemoveRfidMapping(mapping.RfidId))
                {
                    _hasChanges = true;
                    RefreshRfidMappingList();
                    UpdateTitle();
                    MessageBox.Show("RFID 매핑이 삭제되었습니다.", "성공", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
                else
                {
                    MessageBox.Show("RFID 매핑 삭제에 실패했습니다.", "오류", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            }
        }

        #endregion

        #region File Operations

        private void NewMap()
        {
            _mapNodes.Clear();
            _rfidMappings.Clear();
            _nodeResolver = new NodeResolver(_rfidMappings, _mapNodes);
            _selectedNode = null;
            _currentMapFile = string.Empty;
            _hasChanges = false;
            
            RefreshAll();
            UpdateTitle();
        }

        private void OpenMap()
        {
            var openFileDialog = new OpenFileDialog
            {
                Filter = "AGV Map Files (*.agvmap)|*.agvmap|JSON Files (*.json)|*.json|All Files (*.*)|*.*",
                DefaultExt = "agvmap"
            };

            if (openFileDialog.ShowDialog() == DialogResult.OK)
            {
                try
                {
                    LoadMapFromFile(openFileDialog.FileName);
                    _currentMapFile = openFileDialog.FileName;
                    _hasChanges = false;
                    RefreshAll();
                    UpdateTitle();
                    MessageBox.Show("맵이 성공적으로 로드되었습니다.", "성공", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
                catch (Exception ex)
                {
                    MessageBox.Show($"맵 로드 중 오류가 발생했습니다: {ex.Message}", "오류", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            }
        }

        private void SaveMap()
        {
            if (string.IsNullOrEmpty(_currentMapFile))
            {
                SaveAsMap();
            }
            else
            {
                try
                {
                    SaveMapToFile(_currentMapFile);
                    _hasChanges = false;
                    UpdateTitle();
                    MessageBox.Show("맵이 성공적으로 저장되었습니다.", "성공", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
                catch (Exception ex)
                {
                    MessageBox.Show($"맵 저장 중 오류가 발생했습니다: {ex.Message}", "오류", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            }
        }

        private void SaveAsMap()
        {
            var saveFileDialog = new SaveFileDialog
            {
                Filter = "AGV Map Files (*.agvmap)|*.agvmap|JSON Files (*.json)|*.json",
                DefaultExt = "agvmap",
                FileName = "NewMap.agvmap"
            };

            if (saveFileDialog.ShowDialog() == DialogResult.OK)
            {
                try
                {
                    SaveMapToFile(saveFileDialog.FileName);
                    _currentMapFile = saveFileDialog.FileName;
                    _hasChanges = false;
                    UpdateTitle();
                    MessageBox.Show("맵이 성공적으로 저장되었습니다.", "성공", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
                catch (Exception ex)
                {
                    MessageBox.Show($"맵 저장 중 오류가 발생했습니다: {ex.Message}", "오류", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            }
        }

        private void LoadMapFromFile(string filePath)
        {
            var json = File.ReadAllText(filePath);
            var mapData = JsonConvert.DeserializeObject<MapData>(json);
            
            _mapNodes = mapData.Nodes ?? new List<MapNode>();
            _rfidMappings = mapData.RfidMappings ?? new List<RfidMapping>();
            _nodeResolver = new NodeResolver(_rfidMappings, _mapNodes);
        }

        private void SaveMapToFile(string filePath)
        {
            var mapData = new MapData
            {
                Nodes = _mapNodes,
                RfidMappings = _rfidMappings,
                CreatedDate = DateTime.Now,
                Version = "1.0"
            };
            
            var json = JsonConvert.SerializeObject(mapData, Formatting.Indented);
            File.WriteAllText(filePath, json);
        }

        private bool CheckSaveChanges()
        {
            if (_hasChanges)
            {
                var result = MessageBox.Show("변경사항이 있습니다. 저장하시겠습니까?", "변경사항 저장", 
                                           MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question);
                
                if (result == DialogResult.Yes)
                {
                    SaveMap();
                    return !_hasChanges; // 저장이 성공했으면 true
                }
                else if (result == DialogResult.Cancel)
                {
                    return false;
                }
            }
            
            return true;
        }

        #endregion

        #region UI Updates

        private void RefreshAll()
        {
            RefreshNodeList();
            RefreshRfidMappingList();
            RefreshMapCanvas();
            ClearNodeProperties();
        }

        private void RefreshNodeList()
        {
            listBoxNodes.DataSource = null;
            listBoxNodes.DataSource = _mapNodes;
            listBoxNodes.DisplayMember = "Name";
            listBoxNodes.ValueMember = "NodeId";
        }

        private void RefreshRfidMappingList()
        {
            listBoxRfidMappings.DataSource = null;
            listBoxRfidMappings.DataSource = _rfidMappings;
            listBoxRfidMappings.DisplayMember = "ToString";
        }

        private void RefreshMapCanvas()
        {
            _mapCanvas?.Invalidate();
        }

        private void UpdateNodeProperties()
        {
            if (_selectedNode == null)
            {
                ClearNodeProperties();
                return;
            }

            // 선택된 노드의 속성을 프로퍼티 패널에 표시
            // (실제로는 PropertyGrid나 별도 컨트롤 사용)
            labelSelectedNode.Text = $"선택된 노드: {_selectedNode.Name} ({_selectedNode.NodeId})";
        }

        private void ClearNodeProperties()
        {
            labelSelectedNode.Text = "선택된 노드: 없음";
        }

        private void UpdateTitle()
        {
            var title = "AGV Map Editor";
            
            if (!string.IsNullOrEmpty(_currentMapFile))
            {
                title += $" - {Path.GetFileName(_currentMapFile)}";
            }
            
            if (_hasChanges)
            {
                title += " *";
            }
            
            this.Text = title;
        }

        #endregion

        #region Form Events

        private void MainForm_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (!CheckSaveChanges())
            {
                e.Cancel = true;
            }
        }

        #endregion

        #region Data Model for Serialization

        private class MapData
        {
            public List<MapNode> Nodes { get; set; } = new List<MapNode>();
            public List<RfidMapping> RfidMappings { get; set; } = new List<RfidMapping>();
            public DateTime CreatedDate { get; set; }
            public string Version { get; set; } = "1.0";
        }

        #endregion
    }
}