using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;

namespace FontPreview
{
	/// <summary>
	/// 字体对比对话框。
	/// 模式一（showList=true）：把已加入对比列表的多个字体纵向滚动排列，同一文字/字号并排渲染。
	/// 模式二（showList=false）：从全部字体里选两个下拉框对比。
	/// </summary>
	public class CompareDialog : Form
	{
		private List<FontItem> items;
		private bool listMode;
		private ComboBox cboA;
		private ComboBox cboB;
		private TextBox txtText;
		private NumericUpDown numSize;
		private PictureBox picA;
		private PictureBox picB;
		private Label lblNameA;
		private Label lblNameB;
		private Panel scrollPanel;
		private List<PictureBox> listPics = new List<PictureBox>();
		private List<Label> listNames = new List<Label>();
		private List<RoundPanel> listCards = new List<RoundPanel>();
		private Action<string> installCallback;

		public CompareDialog(List<FontItem> items, bool showList, Action<string> installCallback = null)
		{
			this.installCallback = installCallback;
			this.items = items;
			this.listMode = showList;
			Text = listMode ? "字体多字体对比（已加入 " + items.Count + " 个）" : "字体并排对比";
			FormBorderStyle = FormBorderStyle.SizableToolWindow;
			StartPosition = FormStartPosition.CenterParent;
			ClientSize = new Size(820, 600);
			Font = new Font("Microsoft YaHei UI", 9f);
			MinimumSize = new Size(620, 460);

			// 顶部：文字 + 字号 + 渲染
			Label lt = new Label { Text = "文字：", Location = new Point(12, 15), Size = new Size(44, 20) };
			txtText = new TextBox { Location = new Point(62, 12), Size = new Size(560, 24), Text = "永字八法 横平竖直 你好世界 ABC 0123" };
			Label ls = new Label { Text = "字号：", Location = new Point(632, 15), Size = new Size(40, 20) };
			numSize = new NumericUpDown { Location = new Point(676, 12), Size = new Size(60, 24), Minimum = 12, Maximum = 120, Value = 36 };
			Button btnGo = new Button { Text = "渲染", Location = new Point(744, 11), Size = new Size(58, 26) };
			btnGo.Click += OnRender;
			numSize.ValueChanged += OnRender;
			txtText.Leave += delegate { OnRender(null, null); };
			txtText.KeyDown += delegate (object s, KeyEventArgs k) { if (k.KeyCode == Keys.Enter) { OnRender(null, null); k.SuppressKeyPress = true; } };
			Controls.Add(lt); Controls.Add(txtText); Controls.Add(ls); Controls.Add(numSize); Controls.Add(btnGo);

			if (listMode)
			{
				scrollPanel = new Panel { Location = new Point(12, 44), Size = new Size(790, 544), AutoScroll = true, BackColor = Color.White };
				Controls.Add(scrollPanel);
				RebuildList();
			}
			else
			{
				Label la = new Label { Text = "字体 A：", Location = new Point(12, 48), Size = new Size(50, 20) };
				cboA = new ComboBox { DropDownStyle = ComboBoxStyle.DropDownList, Location = new Point(62, 45), Size = new Size(360, 24) };
				Label lb = new Label { Text = "字体 B：", Location = new Point(430, 48), Size = new Size(50, 20) };
				cboB = new ComboBox { DropDownStyle = ComboBoxStyle.DropDownList, Location = new Point(480, 45), Size = new Size(268, 24) };
				foreach (FontItem it in items)
				{
					string s = it.DisplayName + "  ——  " + it.Name;
					cboA.Items.Add(s);
					cboB.Items.Add(s);
				}
				if (cboA.Items.Count > 0) cboA.SelectedIndex = 0;
				if (cboB.Items.Count > 1) cboB.SelectedIndex = 1; else if (cboB.Items.Count > 0) cboB.SelectedIndex = 0;
				lblNameA = new Label { Location = new Point(12, 82), Size = new Size(776, 18), ForeColor = Color.DimGray };
				lblNameB = new Label { Location = new Point(12, 282), Size = new Size(776, 18), ForeColor = Color.DimGray };
				picA = new PictureBox { Location = new Point(12, 102), Size = new Size(776, 176), BackColor = Color.FromArgb(242, 244, 247), SizeMode = PictureBoxSizeMode.Zoom, BorderStyle = BorderStyle.FixedSingle };
				picB = new PictureBox { Location = new Point(12, 302), Size = new Size(776, 176), BackColor = Color.FromArgb(242, 244, 247), SizeMode = PictureBoxSizeMode.Zoom, BorderStyle = BorderStyle.FixedSingle };
				Controls.Add(la); Controls.Add(cboA);
				Controls.Add(lb); Controls.Add(cboB);
				Controls.Add(lblNameA); Controls.Add(lblNameB);
				Controls.Add(picA); Controls.Add(picB);
			}

			Shown += delegate { OnRender(null, null); };
		}

		private void RebuildList()
		{
			scrollPanel.Controls.Clear();
			listPics.Clear();
			listNames.Clear();
			listCards.Clear();
			int w = scrollPanel.ClientSize.Width - 24;
			if (w < 400) w = 400;
			for (int i = 0; i < items.Count; i++)
			{
				FontItem it = items[i];
				RoundPanel card = UiTheme.CreateCard(w, 180);
				Panel accent = UiTheme.CreateAccentBar(14, 16);
				Label name = UiTheme.CreateCardTitle(it.DisplayName, 26, 12, w - 44);
				PictureBox pic = UiTheme.CreatePreviewBox(18, 46, w - 36, 120);
				// 右键：以快捷方式安装
				ContextMenuStrip cm = new ContextMenuStrip();
				ToolStripMenuItem miInstall = new ToolStripMenuItem("以快捷方式安装（复制到左侧目录）");
				miInstall.Click += delegate
				{
					if (installCallback != null) installCallback(it.Path);
				};
				cm.Items.Add(miInstall);
				card.ContextMenuStrip = cm;
				pic.ContextMenuStrip = cm;
				name.ContextMenuStrip = cm;
				// 左键复制字体名
				card.Cursor = Cursors.Hand;
				EventHandler copyClick = delegate { try { Clipboard.SetText(it.Name); } catch { } };
				card.MouseClick += (MouseEventHandler)delegate (object s, MouseEventArgs e) { if (e.Button == MouseButtons.Left) copyClick(s, e); };
				pic.MouseClick += (MouseEventHandler)delegate (object s, MouseEventArgs e) { if (e.Button == MouseButtons.Left) copyClick(s, e); };
				name.MouseClick += (MouseEventHandler)delegate (object s, MouseEventArgs e) { if (e.Button == MouseButtons.Left) copyClick(s, e); };
				card.Controls.Add(accent);
				card.Controls.Add(name);
				card.Controls.Add(pic);
				scrollPanel.Controls.Add(card);
				listCards.Add(card);
				listNames.Add(name);
				listPics.Add(pic);
			}
		}

		private void OnRender(object sender, EventArgs e)
		{
			if (listMode)
			{
				for (int i = 0; i < items.Count; i++)
				{
					RenderOne(i, listPics[i], listNames[i]);
				}
				LayoutList();
			}
			else
			{
				RenderOne(cboA.SelectedIndex, picA, lblNameA);
				RenderOne(cboB.SelectedIndex, picB, lblNameB);
			}
		}

		// 按每张图片实际高度重排卡片纵向位置
		private void LayoutList()
		{
			int y = 8;
			int w = scrollPanel.ClientSize.Width - 24;
			if (w < 400) w = 400;
			for (int i = 0; i < listCards.Count; i++)
			{
				int h = (listPics[i].Image != null) ? listPics[i].Image.Height : 120;
				if (h > 400) h = 400;
				if (h < 60) h = 60;
				listCards[i].Width = w;
				listCards[i].Height = 46 + h + 10;
				listCards[i].Top = y;
				listCards[i].Left = 8;
				listPics[i].Height = h;
				y += listCards[i].Height + 12;
			}
		}

		private void RenderOne(int idx, PictureBox pic, Label nameLbl)
		{
			if (idx < 0 || idx >= items.Count) return;
			FontItem it = items[idx];
			bool failed;
			Bitmap bmp = Worker.RenderFont(it.Path, it.Name, txtText.Text, (int)numSize.Value, Color.Black, Color.White, out failed);
			nameLbl.Text = it.DisplayName;
			if (bmp != null)
			{
				// 新图画好后再一次性替换旧图，避免中间空白闪烁
				Bitmap old = (Bitmap)pic.Image;
				pic.Image = bmp;
				if (old != null) old.Dispose();
			}
			else
			{
				nameLbl.Text = it.DisplayName + "（渲染失败）";
			}
		}
	}
}