using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;
using AGVNavigationCore.Models;
using AGVNavigationCore.Utils;

namespace AGVMapEditor.Forms
{
    /// <summary>
    /// 이미지 노드의 이미지를 편집하기 위한 간단한 그림판
    /// 불러오기, 저장, 크기 조정, 기본 드로잉 기능 제공
    /// </summary>
    public partial class ImageEditorForm : Form
    {
        private MapImage _targetNode;

        public ImageEditorForm(MapImage imageNode = null)
        {
            InitializeComponent();
            _targetNode = imageNode;
            SetupUI();

            if (imageNode != null && imageNode.LoadedImage != null)
            {
                LoadImageFromNode(imageNode);
            }
            
            this.KeyPreview = true;
            this.KeyDown += (s1, e1) => {
                if (e1.KeyCode == Keys.Escape) this.Close();
            };
        }

        private void SetupUI()
        {
            // 캔버스 초기 설정
            imageCanvas.BrushSize = trackBrush.Value;
            imageCanvas.BrushModeEnabled = chkBrushMode.Checked;
            imageCanvas.BackColor = Color.FromArgb(32,32,32);
            
            // 이벤트 연결
            chkBrushMode.CheckedChanged += (s, e) => imageCanvas.BrushModeEnabled = chkBrushMode.Checked;
        }

        private void TrackBrush_ValueChanged(object sender, EventArgs e)
        {
            imageCanvas.BrushSize = trackBrush.Value;
        }

        private void LoadImageFromNode(MapImage node)
        {
            if (node.LoadedImage != null)
            {
                imageCanvas.EditingImage = new Bitmap(node.LoadedImage);
            }
        }

        private void BtnOpen_Click(object sender, EventArgs e)
        {
            using (var ofd = new OpenFileDialog { Filter = "이미지|*.jpg;*.png;*.bmp|모든 파일|*.*" })
            {
                if (ofd.ShowDialog() == DialogResult.OK)
                {
                    LoadImageFromFile(ofd.FileName);
                }
            }
        }
        
        private void LoadImageFromFile(string filePath)
        {
            try
            {
                var loadedImage = Image.FromFile(filePath);

                // 이미지 크기가 크면 자동 축소 (최대 512x512)
                Bitmap finalImage;
                if (loadedImage.Width > 512 || loadedImage.Height > 512)
                {
                    finalImage = ResizeImage(loadedImage, 512, 512);
                    loadedImage.Dispose();
                }
                else
                {
                    finalImage = new Bitmap(loadedImage);
                    loadedImage.Dispose();
                }

                imageCanvas.EditingImage = finalImage;
            }
            catch (Exception ex)
            {
                MessageBox.Show($"이미지 로드 실패: {ex.Message}");
            }
        }

        private void BtnResize_Click(object sender, EventArgs e)
        {
            if (imageCanvas.EditingImage == null)
            {
                MessageBox.Show("먼저 이미지를 로드하세요.");
                return;
            }

            var currentSize = imageCanvas.ImageDisplaySize;

            using (var form = new Form())
            {
                form.Text = "이미지 크기 조정";
                form.Size = new Size(300, 150);
                form.StartPosition = FormStartPosition.CenterParent;

                var lblWidth = new Label { Text = "너비:", Left = 10, Top = 10, Width = 50 };
                var txtWidth = new TextBox { Left = 70, Top = 10, Width = 100, Text = currentSize.Width.ToString() };

                var lblHeight = new Label { Text = "높이:", Left = 10, Top = 40, Width = 50 };
                var txtHeight = new TextBox { Left = 70, Top = 40, Width = 100, Text = currentSize.Height.ToString() };

                var btnOk = new Button { Text = "적용", DialogResult = DialogResult.OK, Left = 70, Top = 70, Width = 100 };
                var btnCancel = new Button { Text = "취소", DialogResult = DialogResult.Cancel, Left = 180, Top = 70, Width = 70 };

                form.Controls.Add(lblWidth);
                form.Controls.Add(txtWidth);
                form.Controls.Add(lblHeight);
                form.Controls.Add(txtHeight);
                form.Controls.Add(btnOk);
                form.Controls.Add(btnCancel);

                if (form.ShowDialog(this) == DialogResult.OK)
                {
                    if (int.TryParse(txtWidth.Text, out int width) && int.TryParse(txtHeight.Text, out int height))
                    {
                        if (width > 0 && height > 0)
                        {
                            var resized = new Bitmap(imageCanvas.EditingImage, width, height);
                            imageCanvas.EditingImage = resized;
                        }
                    }
                }
            }
        }

        private void BtnColor_Click(object sender, EventArgs e)
        {
            using (var cfd = new ColorDialog { Color = imageCanvas.DrawColor })
            {
                if (cfd.ShowDialog() == DialogResult.OK)
                {
                    imageCanvas.DrawColor = cfd.Color;
                    (sender as Button).BackColor = cfd.Color;
                }
            }
        }

        private void BtnSave_Click(object sender, EventArgs e)
        {
            if (imageCanvas.EditingImage == null)
            {
                MessageBox.Show("저장할 이미지가 없습니다.");
                return;
            }

            if (_targetNode != null)
            {
                // 표시 크기로 리사이즈된 이미지 가져오기
                var finalImage = imageCanvas.GetResizedImage();

                if (finalImage == null)
                {
                    MessageBox.Show("이미지 처리 중 오류가 발생했습니다.");
                    return;
                }

                var displaySize = imageCanvas.ImageDisplaySize;
                MessageBox.Show($"이미지 크기: {displaySize.Width}x{displaySize.Height}로 저장됩니다.");

                // 이미지를 Base64로 변환하여 저장
                _targetNode.ImageBase64 = ImageConverterUtil.ImageToBase64(finalImage, System.Drawing.Imaging.ImageFormat.Png);
                _targetNode.LoadedImage?.Dispose();
                _targetNode.LoadedImage = finalImage;

                MessageBox.Show("이미지가 저장되었습니다.");
                this.DialogResult = DialogResult.OK;
                this.Close();
            }
        }

        private Bitmap ResizeImage(Image image, int maxWidth, int maxHeight)
        {
            double ratioX = (double)maxWidth / image.Width;
            double ratioY = (double)maxHeight / image.Height;
            double ratio = Math.Min(ratioX, ratioY);

            int newWidth = (int)(image.Width * ratio);
            int newHeight = (int)(image.Height * ratio);

            var resized = new Bitmap(newWidth, newHeight);
            using (var g = Graphics.FromImage(resized))
            {
                g.CompositingQuality = CompositingQuality.HighQuality;
                g.InterpolationMode = InterpolationMode.HighQualityBicubic;
                g.SmoothingMode = SmoothingMode.HighQuality;
                g.DrawImage(image, 0, 0, newWidth, newHeight);
            }
            return resized;
        }
    }
}